1,084 results on '"IMPOSEX"'
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2. Investigation of Imposex in a Marine Gastropod Tibia curta (Sowerby II, 1842) at Gadani Ship Breaking Yards.
- Author
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Munawar, Seharish and Afsar, Nuzhat
- Subjects
- *
SHIPYARDS , *VAS deferens , *TIBIA , *SHIPBREAKING , *GASTROPODA - Abstract
Imposex is a well-known phenomena that has been documented over more than fifty years (50) in several marine gastropod species world around. The Phenomenon of imposex is directly connected with toxicity of tributyl (TBT) contamination and the source of this contamination is shipping traffic due to the use of TBT-based paints on ship hulls and the leaching of content into the water column. So, during the present study specimens of Tibia curta (Sowerby II, 1842), collected and investigated for the planned study from Gadani ship breaking yards (25.0361° N, 66.7136° E) which is the third largest ship dismantling site across the globe. Specimens were procured for a period of February 2019 to October 2021 in different intervals from the four selected sites along the Pakistan coast. Imposex was recorded only in the specimens of Gadani. The intensity of Imposex determination was based on the presence of and psudopenis and VDS (vas deferens sequence) in imposex female individuals. Imposex remained promising onlyat Gadani where imposex intensity was found 100% in females as when compared to other three sites. Whereas 1 to 4+ Vas deferens sequence (VDS) stages were observed in imposex females. Therefore, studies revealed the presence of imposex phenomena in targeted species at Gadani due to high concentration of leached out organometalic compound Tributyltin Tin (TBT) from the ship breaking scrap which is responsible to change hormonal levels and subsequent physiological change related to sexuality in animals as well as also responsible to bring morphological changes in other body parts like antenna and eye spot of affected individual. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Marine Pollutant Tributyltin Affects DNA Methylation and Fitness of Banded Murex (Hexaplex trunculus) Populations.
- Author
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Šrut, Maja, Sabolić, Iva, Erdelez, Anita, Grbin, Dorotea, Furdek Turk, Martina, Bakarić, Robert, Peharda, Melita, and Štambuk, Anamaria
- Subjects
METHYLATION ,DNA methylation ,POPULATION differentiation ,TRIBUTYLTIN ,POLLUTANTS ,GENETIC variation - Abstract
Banded murex, Hexaplex trunculus, is a marine gastropod whose reproductive fitness can be severely affected by very low concentrations of antifouling compound tributyltin (TBT). TBT has strong xenoandrogen impacts on snails, causing the development of imposex (e.g., the superimposition of male sexual characteristic in females), thereby affecting the fitness of entire populations. TBT is also known as a DNA-demethylating agent and an obesogenic factor. The aim of this study was to unravel the interactions between TBT bioaccumulation, phenotypic responses, and epigenetic and genetic endpoints in native populations of H. trunculus. Seven populations inhabiting environments along the pollution gradient were sampled in the coastal eastern Adriatic. These included sites of intense marine traffic and boat maintenance activity and sites with low anthropogenic impact. Populations inhabiting intermediately and highly polluted sites exhibited higher TBT burdens, higher incidences of imposex, and higher wet masses of snails than populations in lowly polluted sites. Other morphometric traits and cellular biomarker responses did not show clear differentiation among populations in relation to marine traffic/pollution intensity. An analysis of methylation sensitive amplification polymorphism (MSAP) revealed environmentally driven population differentiation and higher epigenetics than genetic within-population diversity. Moreover, decreases in genome-wide DNA methylation coincided with the imposex level and snail mass, suggesting an epigenetic background of the animal phenotypic response. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Imposex incidence in gastropod species from the Colombian Caribbean Coast reveals continued and widespread tributyltin contamination after its global ban.
- Author
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Meza-Morelos, Dairo, Johnson Restrepo, Boris, Braga Castro, Ítalo, Fillmann, Gilberto, and Fernández Maestre, Roberto
- Subjects
ORGANOTIN compounds ,TRIBUTYLTIN ,GASTROPODA ,SNAILS ,COMMUNITY life ,ANTIFOULING paint - Abstract
Organotin compounds (OTCs), such as tributyltin (TBT) and triphenyltin (TPhT), are released in aquatic environments from antifouling coatings and can cause imposex, an abnormal condition where female snails develop male sexual characteristics. This study investigates temporal variations in imposex incidence along the Colombian Caribbean coast following the 2008 global ban on TBT-based antifouling paints. Over a 12-year period, we assessed imposex in 1,384 adults snails from six species (58% female and 42% male) during 2012, 2016, and 2023. In 2012, just four years after the ban, imposex incidence in some sites reached 100% in the neogastropods Purpura patula , Stramonita haemastoma, Stramonita rustica, and Thais deltoideia. In 2016, imposex in some sites reached 81% for the mesogastropod Strombus pugilis and 39% for the neogastropod Melongena melongena. By 2023, imposex decreased for the first four neogastropods, persisted for S. pugilis , and increased for M. melongena only in Cartagena Bay and the Tolú marina. These findings indicate a general decline in imposex over time, aligning with the ban, but also suggest potential new sources of contamination as imposex rates increased in some previously unaffected areas. [Display omitted] • Organotin compounds (OTC) cause imposex, reproductive alterations on female gastropods. • OTCs are used in paints to avoid fouling on boats and surfaces exposed to seawater. • Imposex has produced economic losses to communities harvesting these resources. • We measured the imposex index and normalized penis length index in gastropods. • Imposex correlated with boating traffic on the Colombian Caribbean coast. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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5. Microplásticos e imposex en el caracol marino Thaisella chocolata procedente de la costa central marina del Perú.
- Author
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Torres-Zevallos, U., Arenas-Valeriano, A. D., Alvariño, L., and Iannacone, J.
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DISSOLVED oxygen in seawater ,MARINE ecology ,SNAILS ,HARBORS ,MICROPLASTICS - Abstract
Copyright of Revista Veterinaria is the property of Universidad Nacional del Nordeste and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
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6. IMPOSEX EN Thais Brevidentata, Thais Kiosquiformis, Thais Biserialis (MOLLUSCA: GASTROPODA: MURICIDAE) DEL PERFIL CENTRO-SUR DE LA COSTA ECUATORIANA, UNA INDICACIÓN DE CONTAMINACIÓN POR COMPUESTOS ORGANOESTAÑOSOS
- Author
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María Arroyo Osorio and Italo Braga de Castro
- Subjects
bioindicador ,tributilestaño ,imposex ,murícidos ,thais sp ,ecuador ,Chemistry ,QD1-999 ,Plant ecology ,QK900-989 ,Geology ,QE1-996.5 ,Biology (General) ,QH301-705.5 - Abstract
La presente investigación constituye el primer reporte de imposex en Ecuador y de la costa pacífica sudamericana para las especies Thais kiosquiformis y Thais biserialis. El estudio incluyó además a la especie Thais brevidentata (Mollusca: Gasteropoda: Muricidae). Se muestrearon puertos mercantes, pesqueros y playas del perfil costero, indicando la presencia de imposex en doce de las catorce localidades muestreadas. T. kiosquiformis fue la única especie que se presentó en el ambiente estuarino del Golfo de Guayaquil mostrando, en todas las hembras colectadas, imposex con los mayores valores en índices de RPLI (40,7%) y VDSI (Grado V) en comparación con T. brevidentata (2,8% y Grado I) y T. biserialis (26,1% y Grado III) que se presentaron en el perfil costero de aguas oceánicas. T. kiosquiformis fue la más sensible para áreas estuarinas mientras que T. biserialis lo es para aguas marinas de mayor salinidad y pueden ser utilizadas como bioindicadores de contaminación por compuestos organoestañosos. Se recomienda incrementar el número de especies de gasterópodos a monitorear en el perfil costero y realizar estudios experimentales a escala de laboratorio para determinar la sensibilidad de los organismos ante el tributilestaño (TBT).
- Published
- 2021
- Full Text
- View/download PDF
7. Marine Pollutant Tributyltin Affects DNA Methylation and Fitness of Banded Murex (Hexaplex trunculus) Populations
- Author
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Maja Šrut, Iva Sabolić, Anita Erdelez, Dorotea Grbin, Martina Furdek Turk, Robert Bakarić, Melita Peharda, and Anamaria Štambuk
- Subjects
population epigenetics ,fitness ,imposex ,pollution ,evolution ,Chemical technology ,TP1-1185 - Abstract
Banded murex, Hexaplex trunculus, is a marine gastropod whose reproductive fitness can be severely affected by very low concentrations of antifouling compound tributyltin (TBT). TBT has strong xenoandrogen impacts on snails, causing the development of imposex (e.g., the superimposition of male sexual characteristic in females), thereby affecting the fitness of entire populations. TBT is also known as a DNA-demethylating agent and an obesogenic factor. The aim of this study was to unravel the interactions between TBT bioaccumulation, phenotypic responses, and epigenetic and genetic endpoints in native populations of H. trunculus. Seven populations inhabiting environments along the pollution gradient were sampled in the coastal eastern Adriatic. These included sites of intense marine traffic and boat maintenance activity and sites with low anthropogenic impact. Populations inhabiting intermediately and highly polluted sites exhibited higher TBT burdens, higher incidences of imposex, and higher wet masses of snails than populations in lowly polluted sites. Other morphometric traits and cellular biomarker responses did not show clear differentiation among populations in relation to marine traffic/pollution intensity. An analysis of methylation sensitive amplification polymorphism (MSAP) revealed environmentally driven population differentiation and higher epigenetics than genetic within-population diversity. Moreover, decreases in genome-wide DNA methylation coincided with the imposex level and snail mass, suggesting an epigenetic background of the animal phenotypic response.
- Published
- 2023
- Full Text
- View/download PDF
8. Retinoids promote penis development in sequentially hermaphroditic snails.
- Author
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Lesoway, Maryna P. and Henry, Jonathan Q.
- Subjects
- *
RETINOID X receptors , *RETINOIC acid receptors , *RETINOIDS , *SEX change in animals , *X chromosome , *SNAILS , *PENIS , *ENDOCRINE disruptors - Abstract
Sexual systems are surprisingly diverse, considering the ubiquity of sexual reproduction. Sequential hermaphroditism, the ability of an individual to change sex, has emerged multiple times independently across the animal kingdom. In molluscs, repeated shifts between ancestrally separate sexes and hermaphroditism are generally found at the level of family and above, suggesting recruitment of deeply conserved mechanisms. Despite this, molecular mechanisms of sexual development are poorly known. In molluscs with separate sexes, endocrine disrupting toxins bind the retinoid X receptor (RXR), activating ectopic male development in females, suggesting the retinoid pathway as a candidate controlling sexual transitions in sequential hermaphrodites. We therefore tested the role of retinoic acid signaling in sequentially hermaphroditic Crepidula snails, which develop first into males, then change sex, maturing into females. We show that retinoid agonists induce precocious penis growth in juveniles and superimposition of male development in females. Combining RXR antagonists with retinoid agonists significantly reduces penis length in induced juveniles, while similar treatments using retinoic acid receptor (RAR) antagonists increase penis length. Transcripts of both receptors are expressed in the induced penis. Our findings therefore show that retinoid signaling can initiate molluscan male genital development, and regulate penis length. Further, we show that retinoids induce ectopic male development in multiple Crepidula species. Species-specific influence of conspecific induction of sexual transitions correlates with responsiveness to retinoids. We propose that retinoid signaling plays a conserved role in molluscan male development, and that shifts in the timing of retinoid signaling may have been important for the origins of sequential hermaphroditism within molluscs. [Display omitted] • Retinoid agonists induce penis growth in sequentially hermaphroditic snails. • Blocking RXR or retinoic acid synthesis decreases penis length. • RXR , RAR , and CYP2 6 mRNA are expressed in the induced penis. • Shifts in retinoid timing may be involved in repeated evolution of hermaphroditism. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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9. Endocrine disruption in aquatic species of Chile
- Author
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Carlos Valdovinos and Sandra Claros
- Subjects
imposex ,phytosterols ,pulp and paper mill effluents ,sewage ,tributyltin ,Oceanography ,GC1-1581 ,Zoology ,QL1-991 - Abstract
Compounds called endocrine disrupters (EDs) interfere with the endocrine systems of aquatic animals such as fish, amphibians, and mollusks. EDs impact sexual development and other functions that can affect the fitness of individuals with potential consequences to the population. We reviewed 45 studies published between 1999 and 2020 on the impact EDs have on aquatic species in Chile, including both indexed and non-indexed articles. The objective of this review is to identify geographic areas and organisms in which endocrine disruption has been detected, the alterations reported, and the compounds involved. We found 11 publications on marine mollusks, 17 on fish, and two on amphibians. Eight publications described bioassays, seven were related to environmental contamination including a review on monitoring the environmental effects of pulp and paper mill effluent (PPME). There is a worldwide concern about the endocrine disruption in aquatic species, however, this concern is still not considered in Chilean environmental regulations. The publications analyzed in this review demonstrate why Chilean environmental authorities should consider EDs in the regulatory process.
- Published
- 2021
10. Tributyltin: Advancing the Science on Assessing Endocrine Disruption with an Unconventional Endocrine-Disrupting Compound
- Author
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Lagadic, Laurent, Katsiadaki, Ioanna, Biever, Ron, Guiney, Patrick D., Karouna-Renier, Natalie, Schwarz, Tamar, Meador, James P., and de Voogt, Pim, Series Editor
- Published
- 2018
- Full Text
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11. Reproductive Organ Development in the Ivory Shell Babylonia japonica and the Rock Shell Thais clavigera
- Author
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Horiguchi, Toshihiro and Horiguchi, Toshihiro, editor
- Published
- 2017
- Full Text
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12. Current Status of Contamination by Organotins and Imposex in Prosobranch Gastropods in Korea
- Author
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Cho, Hyeon-Seo, Horiguchi, Toshihiro, and Horiguchi, Toshihiro, editor
- Published
- 2017
- Full Text
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13. Organotins and Imposex in Europe: A Pre-ban and Post-ban Perspective
- Author
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Sousa, Ana Catarina A., Pastorinho, M. Ramiro, and Horiguchi, Toshihiro, editor
- Published
- 2017
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14. Contamination by Organotins and Its Population-Level Effects Involved by Imposex in Prosobranch Gastropods
- Author
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Horiguchi, Toshihiro and Horiguchi, Toshihiro, editor
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- 2017
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15. Imposex Incidence in Gastropod Species from Santa Marta Coastal Zone, Colombian Caribbean Sea.
- Author
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Rodríguez-Grimon, René, Campos, Néstor Hernando, and Castro, Ítalo Braga
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COASTS ,ANTIFOULING paint ,WATER quality ,ORGANOTIN compounds ,GASTROPODA - Abstract
Imposex is a phenomenon widely associated with environmental exposure to organotin compounds which were quite common components of antifouling paints applied on boats and ship hulls. Here we study the incidence of imposex in neogastropods and its relation with water quality and maritime traffic in the coastal strip of Santa Marta, Colombia. Imposex was determined via specialized indexes and related to the organisms' size, somatic conditions, variables of water quality and maritime traffic, in a space–time assessment. There was evidence of imposex in five species Plicopurpura patula, Vasula deltoidea, Stramonita haemastoma, S. floridana, and Gemophos auritulus. Purpura patula and Vasula deltoidea species were found in all sampling sites. The results have proved that imposex is highly influenced by the maritime traffic variable, with greater prevalence during the dry season, and with P. patula being more sensitive than V. deltoidea. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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16. Pathological evidence in Plicopurpura pansa associated with the stranding of a bulk carrier ship during Hurricane "Patricia" in the Mexican Central Pacific.
- Author
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Liñán-Cabello, Marco A., Liñán-Rico, Viridiana, Ortega-Ortíz, Christian, and Verduzco-Zapata, Manuel
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BULK carrier cargo ships ,INTERTIDAL zonation ,HURRICANES ,CONTAINER ships ,CARGO ships ,WATER bottles - Abstract
Due to the effects of Hurricane Patricia (2015), the bulk freighter "El Llanitos" ran aground in the rocky intertidal zone of Colima, Mexico. We assessed the impact of this ship's stranding on a population of the gastropod Plicopurpura pansa. Toxic elements, hydrocarbons, shell deformities, presence of tumors, imposex, and morphological relationships were analyzed. Two years after the stranding occurred, high cyanide concentrations (0.0363 mg/l) and Ni concentrations above permissible limits (3.35 mg/l) were found in surface seawater. Hydrocarbon concentrations were high in the aft zone of the ship and decreased towards the bow area of the freighter. The P. pansa specimens collected closest to the ship structure presented a high prevalence of tumorations in the structure of the foot and morphological anomalies in the shell structure; imposex was 32% and there was evidence of effects on the growth indicator. The evidence presented here supports the existence of a significant impact from the grounding of the ship on a protected gastropod species associated with the rocky intertidal zone on the coast of Colima. The potential of P. pansa as a bioindicator species of pollution caused by toxic elements and hydrocarbons associated with stranding events in the tropical Pacific is documented. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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17. Endocrine disruption and altered sexual development in aquatic organisms: an invertebrate perspective.
- Author
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Langston, W. J.
- Abstract
Contaminants causing sex-altering, endocrine disrupting-like (ED) effects, or otherwise influencing reproduction, have been of growing concern to humans for more than 50 years. They have also been a perturbing, though less well-studied, phenomenon in marine organisms, following the recognition of tributyltin (TBT)-induced imposex and population extinctions in (neo)gastropods in the 1970s. Whilst ED impacts in mammals and fish are characterized by mimicry or antagonism of endogenous hormones by environmental contaminants (acting through Nuclear Receptors which are present in all metazoans) much less is known regarding pathways to effects in invertebrates. Despite the absence of a defined steroidal/mechanistic component, the extent, severity and widespread nature of ED-like manifestations and altered sexual characteristics observed in marine invertebrates gives rise to comparable concerns, and have been a long-term component of the MBA's research remit. The manifestations seen in sensitive taxa such as molluscs and crustaceans confirm they are valuable indicators of environmental quality, and should be exploited in this capacity whilst we seek to understand the pervasiveness and underlying mechanisms. In so doing, invertebrate indicators address aims of organizations, such as the EEA, OECD, UNEP and WHO, charged with management and monitoring of chemicals and ensuring that adverse effects on humans and the environment are minimized (Bergman et al., 2013). In view of the recent general declines in marine biodiversity, and the potential contribution of ED-like phenomena, safeguarding against deleterious effects through increased research which links pollutant exposure with reproductive dysfunction among invertebrates, is seen as a high priority. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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18. Sexual Perversions
- Author
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Heller, Joseph and Heller, Joseph
- Published
- 2015
- Full Text
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19. A decadal study of biometric and imposex indices in two gastropods.
- Author
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Ruiz, J. M., Carro, B., Albaina, N., Couceiro, L., Quintela, M., and Barreiro, R.
- Abstract
We have monitored tributyltin (TBT) pollution in Galicia (NW Spain) for more than a decade by means of assessing gastropod imposex in populations of Nucella lapillus (N ≥ 34) and Tritia reticulata (N ≥ 18) at regular intervals. Several thousand specimens were processed to obtain their shell height (SH), penis length (PL) and vas deferens sequence (VDS); imposex indices (including the VDS index, VDSI) were subsequently calculated. The regional mean SH of both females and males has not changed significantly in either species throughout the study. This also applies to the mean male PL in N. lapillus , but male T. reticulata penises surprisingly enlarged. On the contrary, the regional mean female PL (MFPL) and all imposex indices significantly decreased in both snails. Results confirm previous conclusions based on the chemical analyses of tissues and partial imposex observations. In addition, the close correlations between MFPL and VDSI show some potential applications to TBT biomonitoring. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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20. Assessment of reproductive disorder (imposex) induced by tributyltins in marine gastropods.
- Author
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Hassan, Safia, Siddiqui, Ghazala, Trudgett, Alan, Robert, David, Yanyan Zhao, and Xinhong Wang
- Abstract
Imposex is a genital disorder characterized by imposition of male sexual characteristics in female gastropods due to exposure to tributyltin (TBT). TBT is used as biocidal agent in antifouling paints, applied on the ship hulls and marine submerged structures such as fishing gears and buoys. In the present study bioassay experiment was carried out to determine imposex inductive and endocrine disruptive effect of TBT in two species of gastropods of genus Thais. In this experiment normal specimens of T. bufo and T. rudolphi were exposed to three different concentrations (100, 500 and 1000ngl
-1 ) of TBTCl for four weeks in laboratory and at the end of experiment level of free testosterone and TBT body burden was estimated by radioimmunoassay and gas chromatograph coupled with a flame photometric detector respectively. In both tested species exposed to 500 and 1000ngl-1 of TBT imposex stages developed, while in 100ng l-1 and control groups showed no imposex condition. Elevation of free testosterone level in imposex females has also been observed. These observations indicate that the TBT act as potential imposex inducer and endocrine disruptor in the targeted gastropod species and these species can be used as sensitive biomonitoring tool for TBT contamination. [ABSTRACT FROM AUTHOR]- Published
- 2019
21. Imposex response in shell sizes of intertidal snails in multiple environments.
- Author
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Otegui, Mariana B.P., Zamprogno, Gabriela C., França, Millena A., Daros, Bruno N., Albino, Jacqueline, and Costa, Mercia B.
- Subjects
- *
GASTROPODA , *VAS deferens , *SNAILS , *ECOLOGY - Abstract
Imposex affect shell growth in females as well as the reproduction of gastropod species causing a reduction in sexual allocation and a consequent increase in somatic allocation that can be verified by the growth of the shell. The objective of this study was to evaluate the effects of imposex in conjunction with environment categories (i.e. substrate geology, wave exposure, sand deposition and transport, and presence of harbors and marinas near the collection area classified) on shell sizes of two species of marine gastropods, Leucozonia nassa and Stramonita brasiliensis (Caenogastropoda–Neogastropoda). Both gastropod species were sampled during the summer between 2006 and 2014 along the Espírito Santo coast at 35 sites classified according to environment categories. The total length of the specimens, percentage exhibiting imposex and severity of imposex features (using the vas deferens sequence index, VSDI) were determined. Imposex analysis showed that both species were affected; the percentage of individuals with imposex was ≥60%. As expected, the imposex-affected females are significantly larger than healthy females and males in the gastropod species analyzed. Furthermore, the shell size of imposex-affected females increased as the VDSI stages increased for the both species. A first attempt to verify that the females affected by the imposex are always larger than the healthy females and males regardless of environmental factors suggests that for shell size, the imposex effect overwhelms the effects of plasticity in response. Unlabelled Image • Imposex-affected females were always larger than males and healthy females. • TBT influenced shell size more prominently than did the environmental factors. • The shell size increased in conjunction with an increase in the VDSI stage. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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22. Taxonomic review of the genus Boreocingula (Gastropoda: Rissoidae) in the Arctic and cold temperate waters.
- Author
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Nekhaev, Ivan O.
- Subjects
- *
TAXONOMY , *RISSOIDAE , *GASTROPODA , *MORPHOLOGY - Abstract
Rissoidae is a very diverse family of marine microgastropods; however, its Arctic representatives are poorly studied. Taxonomy of Arctic and Subarctic rissoids is still based exclusively on characters of shell, while internal morphology remains unknown for the majority of the species. The present paper provides a taxonomic revision of the genus Boreocingula Golikov et Kussakin, 1974 based on morphology of shell and soft body. The genus includes five species: three of them [B. martyni (Dall, 1887), B. alaskana (Bartsch, 1912), and B. sirenkoi sp.n.] are present in the extreme north of the Pacific Ocean and the adjacent Siberian Seas; and the other two [B. castanea (Møller, 1842) and B. globulus (Møller, 1842)] are known from the Arctic parts of the Atlantic Ocean. B. sirenkoi sp. n. is described as a new species; lectotype for B. martyni is designated. Imposex females are described for B. martyni for the first time. Also, general patterns of rissoid diversity in the Arctic are reviewed based on the results of the present study and published sources. Only 26 species of the family are reliably known from the Arctic seas. The highest species richness was observed in Greenland (16) and in Barents Sea, except for its southwestern part (11). [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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23. Tributyltin and Zebrafish: Swimming in Dangerous Water
- Author
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Clemilson Berto-Júnior, Denise Pires de Carvalho, Paula Soares, and Leandro Miranda-Alves
- Subjects
zebrafish ,tributyltin ,endocrine disruptors ,imposex ,obesogenic ,Diseases of the endocrine glands. Clinical endocrinology ,RC648-665 - Abstract
Zebrafish has been established as a reliable biological model with important insertion in academy (morphologic, biochemical, and pathophysiological studies) and pharmaceutical industry (toxicology and drug development) due to its molecular complexity and similar systems biology that recapitulate those from other organisms. Considering the toxicological aspects, many efforts using zebrafish models are being done in order to elucidate the effects of endocrine disruptors, and some of them are focused on tributyltin (TBT) and its mechanism of action. TBT is an antifouling agent applied in ship’s hull that is constantly released into the water and absorbed by marine organisms, leading to bioaccumulation and biomagnification effects. Thus, several findings of malformations and changes in the normal biochemical and physiologic aspects of these marine animals have been related to TBT contamination. In the present review, we have compiled the most significant studies related to TBT effects in zebrafish, also taking into consideration the effects found in other study models.
- Published
- 2018
- Full Text
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24. Organotin Compounds from Snails to Humans
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Sousa, Ana C. A., Pastorinho, M. Ramiro, Takahashi, Shin, Tanabe, Shinsuke, Lichtfouse, Eric, Series editor, Schwarzbauer, Jan, Series editor, and Robert, Didier, Series editor
- Published
- 2013
- Full Text
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25. Organic Pollutants as Endocrine Disruptors: Organometallics, PAHs, Organochlorine, Organophosphate and Carbamate Insecticides, Phthalates, Dioxins, Phytoestrogens, Alkyl Phenols and Bisphenol A
- Author
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Nair, P. R. Anupama, Sujatha, C. H., Lichtfouse, Eric, editor, Schwarzbauer, Jan, editor, and Robert, Didier, editor
- Published
- 2012
- Full Text
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26. Bioindicator Thais carinifera (mollusca, gastropoda): imposex response and consequences along the Pakistan coast during the period from 1993 to 2012
- Author
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Nuzhat Afsar, Ghazala Siddiqui, and Zarrien Ayub
- Subjects
Imposex ,Gastrópodes ,Biomonitoramento ,Perturbações Endócrinas ,Costa de Karachi ,Oceanography ,GC1-1581 - Abstract
Abstract Endocrine mediated "imposex" phenomenon was investigated and recorded in the muricoid gastropod species Thais carinifera during the two decades from 1993 to 2012 at three (3) sites out of six (6) localities investigated along the Sindh and Balochistan coast, Pakistan. The VDS stages 1 to 4 were apparent in Thais carinifera. The intensity of imposex has remained comparatively low in the populations of harbours in close proximity to port Mohammad Bin-Qasim, namely; Old Korangi Fish Harbour (OKFH) and New Korangi Fish Harbour (NKFH) where shipping activities are sporadic as compared to those in Manora Channel and the adjoining Karachi Port area where intensive shipping activity is rather frequent. Target species found to be good bioindicators have shown a marked decrease over the prolonged study period. Investigations show that this decrease is solely due to globally imposed effective bans on tributyltin (TBT) based antifouling paints over the past decade.
- Published
- 2015
- Full Text
- View/download PDF
27. Levels and trends of tributyltin (TBT) and imposex in dogwhelk (Nucella lapillus) along the Norwegian coastline from 1991 to 2017.
- Author
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Schøyen, Merete, Green, Norman W., Hjermann, Dag Ø., Tveiten, Lise, Beylich, Bjørnar, Øxnevad, Sigurd, and Beyer, Jonny
- Subjects
- *
TRIBUTYLTIN , *NUCELLA lapillus , *COASTAL ecosystem health , *ANTIFOULING paint , *MARINE paint , *COASTS - Abstract
Abstract The banning of organotin biocides, such as tributyltin (TBT), from use in marine antifouling paints is now leading to reproductive health recovery in marine gastropod populations all over the world. TBT induces so-called imposex (superimposition of male sexual characters onto females) in certain marine gastropods, such as the common dogwhelk Nucella lapillus. In this publication, the results of the Norwegian TBT and imposex monitoring in N. lapillus from the period 1991-2017 are presented. Significantly higher levels of TBT and imposex were measured in coastal areas close to shipping lanes along most of the coast prior to 2008 than afterwards. Levels started declining after restrictions were imposed on the use of TBT in all antifouling paint applications, with a total ban in 2008. In 2017, no sign of imposex was found in N. lapillus in any of the monitoring stations along the Norwegian coastline. Based on monitoring data shown herein, the importance of long-term biomonitoring and international chemical regulations, as well as the TBT and imposex story in general, are discussed. Graphical abstract Image 1 Highlights • TBT and imposex (VDSI) in dogwhelk (Nucella lapillus) in Norway declined after global ban of organotin antifoulant paints. • In 2017, imposex was not detected at any of the eight monitoring stations. • TBT concentrations in N. lapillus and blue mussel (Mytilus edulis) were significantly correlated. • Long-term biomonitoring data demonstrate the value of international collaboration on chemical regulations and restrictions. [ABSTRACT FROM AUTHOR]
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- 2019
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28. Size, season and origin of gastropods matter in imposex assessments.
- Author
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Rossato, Martina, Costa, Mércia Barcelos, de Castro, Ítalo Braga, and Pinho, Grasiela Lopes Leães
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GASTROPODA ,SIZE of mollusks ,TRIBUTYLTIN -- Environmental aspects ,ENVIRONMENTAL exposure ,COASTS - Abstract
Through controlled exposure to tributyltin (TBT), the effects of season, size, and population origin were evaluated on imposex incidence in Stramonita brasiliensis. Four experiments were carried out with organisms collected from three different sites on the Brazilian coast (Torres - Rio Grande do Sul, Farol de Santa Marta - Santa Catarina, and Aracruz - Espírito Santo). S. brasiliensis were anesthetized, sexed, measured, classified by size in small (< 30 mm), medium (≥ 30 to ≤ 40 mm), or big (> 40 mm) and injected in the foot muscle with 0.5 μg g −1 of TBT. Organisms were maintained during one month in aquariums with clear marine water under controlled laboratory conditions. One month after injection, the imposex assessments showed that the population from the southeast (tropical) region was more sensitive to TBT than the population from the south of Brazil (the temperate region). A greater sensitivity in the small and medium categories was observed. Females were also more susceptible to TBT when exposed during their reproductive period. Thus, the present study highlighted the need to ensure that intrinsic biological factors related to organisms are considered in such biomonitoring studies to avoid misinterpretation of results. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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29. Occurrence of tumors among gastropods Plicopurpura pansa (Gastropoda: Neogastropoda) in the Port of Manzanillo, Mexico.
- Author
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Ahumada-Martínez, Omar, Hernandez-López, Julieta, and A. Liñán-Cabello, Marco
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GASTROPODA ,BUTYLTIN compounds ,GONADS ,MORPHOMETRICS ,ENVIRONMENTAL health ,TUMORS - Abstract
In order to evaluate the health of Plicopurpura pansa, a species considered vulnerable, a population of this gastropod living in proximity to the port of greatest cargo movement in Mexico was monitored seasonally during 1 year. Morphometric characteristics and sexual proportion were recorded. A macroscopic analysis was carried out to detect malformations and imposex; a histological analysis was performed to evaluate disseminated and gonadal neoplasias; the presence/absence in soft tissues of butyltin species (BTs) as possible contamination agents was also estimated. A total of 508 P. pansa specimens were collected. The largest specimens were obtained in winter. The coefficients of determination inside the port were low (R
2 = 0.453). In general, there was a greater proportion of females than males throughout the year. Distinctive foot malformations (tumors) were recorded, but without signs of imposex. The histological examination confirmed the presence of disseminated neoplasias in the foot and gonads of P. pansa in the Port of Manzanillo. The comparative analysis of the morphological and histological features of the studied gastropod population allowed us to recognize impact patterns in relation to proximity to the port. There were high concentrations of monobutyltin (MBT) and greater abundance of tumors in heavier specimens; this was associated with port proximity zones. P. pansa could therefore serve as a sensitive bioindicator of environmental health in marine systems. [ABSTRACT FROM AUTHOR]- Published
- 2018
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30. TBT is still a matter of concern in Peru.
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Castro, Ítalo Braga, Iannacone, José, Santos, Sabino, and Fillmann, Gilberto
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- *
TRIBUTYLTIN , *MARINE sediments , *COASTS , *GASTROPODA , *ANTIFOULING paint - Abstract
Tributyltin (TBT) environmental concentrations as well as imposex levels have been declining in several coastal areas worldwide. However, recent studies have shown that TBT contamination is still an important issue along some Latin American coastal areas. Thus, the incidence of imposex and butyltin compounds (BTs) in sediments and gastropod tissues was spatially and temporally (2009 and 2012) appraised in Lima (Peru) along potential TBT sources (harbors and marinas). Despite the general pattern of reduction close to Callao harbor, a clear increment in the levels of imposex (RPLI = 0.0 to 8.4 and 0.0 to 28.4/VDSI = 0.0 to 3.3 and 0.0 to 3.5) and TBT in tissues (25 to 112 and 62 to 146 ng Sn g −1 ) of Thaisella chocolata were seen from 2009 to 2012 in two sampling sites, respectively, located nearby a newly established marina. Thus, despite the international restrictions on the use of TBT-based antifouling paints are apparently reducing the inputs at international harbors, the present study clearly shows that marinas are still acting as important sources of TBT to the study area due possibly to the lack of legal restrictions on production, trading and/or use of TBT. The present findings reinforce what has been seen along many other Latin American coastal areas. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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31. Imposex in Stramonita haemastoma from coastal sites of Cartagena, Colombia.
- Author
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Sierra-Marquez, L., Sierra-Marquez, J., De la Rosa, J., and Olivero-Verbel, J.
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GASTROPODA ,MORPHOMETRICS ,ORGANOTIN compounds ,ENDOCRINE disruptors - Abstract
Copyright of Brazilian Journal of Biology is the property of Instituto Internacional de Ecologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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32. Characterization and comparison of transcriptional activities of the retinoid X receptors by various organotin compounds in three prosobranch gastropods; Thais clavigera, Nucella lapillus and Babylonia japonica.
- Author
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Urushitani, Hiroshi, Katsu, Yoshinao, Kagechika, Hiroyuki, Sousa, Ana C.A., Barroso, Carlos M., Ohta, Yasuhiko, Shiraishi, Hiroaki, Iguchi, Taisen, and Horiguchi, Toshihiro
- Subjects
- *
RETINOID X receptors , *ORGANOTIN compounds , *GASTROPODA , *THYROID hormones , *TRETINOIN - Abstract
Two cDNAs of RXR were isolated, for the first time, from the ivory shell, Babylonia japonica , and the transcriptional activities were tested in vitro to compare with other gastropod ( Thais clavigera and Nucella lapillus ) RXR isoforms. The transcriptional activities of all of these RXR isoforms were significantly induced by mammalian RXR agonist, 9- cis retinoic acid (9cRA). The transcriptional activity of T. clavigera RXR-1 was also examined by using 9cRA and 16 organotin compounds, and significant ligand-dependent transactivations were observed by 9cRA and 5 organotins (tributyltin (TBT), tetrabutyltin (TeBT), tripropyltin (TPrT), tricyclohexyltin (TcHT) and triphenyltin (TPhT)). These 5 organotins also induced significant transcriptional activities in N. lapillus and B. japonica RXR isoforms. These 4 organotins, except for TeBT, have been reported to promote the development of imposex after a month of a single injection each, using female T. clavigera . To investigate the function of gastropod RXR isoforms, the effects of mammalian specific pan-agonist, PA024, and pan-antagonist, HX531, were examined, and significant induction of transcriptional activity by PA024 was demonstrated in these gastropod RXR isoforms. The additions of HX531 significantly suppressed the transcriptional activities of these gastropod RXR isoforms by 9cRA and 5 organotins. Using the mammalian two retinoic acid response elements, the transcriptional activities by 2 agonists, 9cRA and PA024, were different among the RXR isoforms of each gastropod species. With retinoid X response element (RXRE), transcriptional activities of TcRXR-1, BjRXR-1, and NlRXRa were significantly higher than those of TcRXR-2, BjRXR-2, and NlRXRb. Transcriptional activities of TcRXR-2, BjRXR-2, and NlRXRb, however, were significantly higher than those of TcRXR-1, BjRXR-1, and NlRXRa with thyroid hormone response element, TREpal. Thus, induction of imposex in prosobranch gastropods is strongly suggested to be triggered by 9cRA and certain organotins, such as TBT and TPhT through the activation of RXRs. These gastropod RXRs might control the different gene transcription by forming homo- or heterodimer complex with their own isoforms. These findings will contribute to our understanding of the fundamentals of the endocrine system in molluscs, particularly on RXR signaling pathway. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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33. Tributyltin and Zebrafish: Swimming in Dangerous Water.
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Berto-Júnior, Clemilson, de Carvalho, Denise Pires, Soares, Paula, and Miranda-Alves, Leandro
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TRIBUTYLTIN ,ZEBRA danio ,ENDOCRINE disruptors - Abstract
Zebrafish has been established as a reliable biological model with important insertion in academy (morphologic, biochemical, and pathophysiological studies) and pharmaceutical industry (toxicology and drug development) due to its molecular complexity and similar systems biology that recapitulate those from other organisms. Considering the toxicological aspects, many efforts using zebrafish models are being done in order to elucidate the effects of endocrine disruptors, and some of them are focused on tributyltin (TBT) and its mechanism of action. TBT is an antifouling agent applied in ship's hull that is constantly released into the water and absorbed by marine organisms, leading to bioaccumulation and biomagnification effects. Thus, several findings of malformations and changes in the normal biochemical and physiologic aspects of these marine animals have been related to TBT contamination. In the present review, we have compiled the most significant studies related to TBT effects in zebrafish, also taking into consideration the effects found in other study models. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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34. Imposex incidence in Stramonita haemastoma (Gastropoda: Muricidae) from the Mediterranean and Atlantic coast after Tributyltin global ban.
- Author
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El Ayari, Tahani, Bierne, Nicolas, and El Menif, Najoua Trigui
- Subjects
- *
MURICIDAE , *NEOGASTROPODA , *PENIS , *ENVIRONMENTAL toxicology , *ANATOMY ,GASTROPODA physiology - Abstract
The development of male genital tract by female gastropods, or imposex, can be caused by the tributyltin used in antifouling paints. A spatial survey of imposex in the gastropod Stramonita haemastoma was conducted across five Western Mediterranean and eleven North-Eastern Atlantic sites, in order to monitor the effectiveness of the tributyltin regulation imposed in the International Maritime Organisation. Imposex still occurs in eight out of eleven Mediterranean sites and in three out of five Atlantic sites. Extreme values of imposex incidence (I%) and degree (VDSI) were recorded in Tunisia, mainly in Bizerta channel (I% = 96.2%, VDSI = 0.96). However, the Relative Penis Length index (RPLI) was higher in Western Mediterranean sites where values varied between 0.56 in Algiers (Algeria) and 11.80 in Bouznika (Morocco). In the European sites, moderate to low imposex level and degree were recorded. All the affected sites were below the Ecotoxicological Assessment Criteria (EAC) derived for TBT. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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35. First assessment of the effectiveness of the international convention on the control of harmful anti-fouling systems on ships in Tunisia using imposex in Hexaplex trunculus as biomarker.
- Author
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Lahbib, Youssef, Abidli, Sami, and Trigui-El Menif, Najoua
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TRIBUTYLTIN -- Environmental aspects ,ECOLOGICAL risk assessment ,BIOLOGICAL tags ,FOULING organisms ,SNAILS - Abstract
The global ban on the use of tributyltin (TBT) forced in September 2008 was ratified in Tunisia as late as June 2011. In this context, the present study aims to highlight the consequences of TBT contamination by monitoring 22 Tunisian sites before (2007) and after the ban (2012 and 2016) using as biomarker the occurrence of imposex in Hexaplex trunculus . From 2004 to 2016, complete recovery from imposex was reported in 11 sites. All average imposex indices calculated for each sampling year also decreased: imposex incidence from 61 to 27%, VDSI from 2 to 0.7, and RPLI from 15.7 to 1.6%. Ecological Quality Ratios (EQR) revealed that the sampling sites are in moderate to good ecological status. Overall, the present study confirms the effectiveness of the enacted legislation in reducing the impact of TBT pollution along the Tunisian coast. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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36. From TBT to booster biocides: Levels and impacts of antifouling along coastal areas of Panama.
- Author
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Batista-Andrade, Jahir Antonio, Caldas, Sergiane Souza, Batista, Rodrigo Moço, Castro, Italo Braga, Fillmann, Gilberto, and Primel, Ednei Gilberto
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TRIBUTYLTIN ,BIOCIDES ,COASTS ,COASTAL sediments ,PANAMA Canal (Panama) - Abstract
Antifouling biocides in surface sediments and gastropod tissues were assessed for the first time along coastal areas of Panama under the influence of maritime activities, including one of the world's busiest shipping zones: the Panama Canal. Imposex incidence was also evaluated in five muricid species distributed along six coastal areas of Panama. This TBT-related biological alteration was detected in three species, including the first report in Purpura panama . Levels of organotins (TBT, DBT, and MBT) in gastropod tissues and surficial sediments ranged from <5 to 104 ng Sn g −1 and <1–149 ng Sn g −1 , respectively. In addition, fresh TBT inputs were observed in areas considered as moderate to highly contaminated mainly by inputs from fishing and leisure boats. Regarding booster biocides, TCMTB and dichlofluanid were not detected in any sample, while irgarol 1051, diuron and DCOIT levels ranged from <0.08 to 2.8 ng g −1 , <0.75–14.1 ng g −1 , and <0.38–81.6 ng g −1 , respectively. The highest level of TBT (149 ng Sn g −1 ) and irgarol 1051 (2.8 ng g −1 ), as well as relevant level of DCOIT (5.7 ng g −1 ), were detected in a marina used by recreational boats. Additionally, relatively high diuron values (14.1 ng g −1 ) were also detected in the Panama Canal associate to a commercial port. DCOIT concentrations were associated with the presence of antifouling paint particles in sediments obtained nearby shipyard or boat maintenance sites. The highest levels of TBT, irgarol 1051, and diuron exceeded international sediment quality guidelines indicating that toxic effects could be expected in coastal areas of Panama. Thus, the simultaneous impacts produced by new and old generations of antifouling paints highlight a serious environmental issue in Panamanian coastal areas. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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- View/download PDF
37. Insights into the Influence of Natural Retinoic Acids on Imposex Induction in Female Marine Gastropods in the Coastal Environment
- Author
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Jianying Hu, Kenneth M.Y. Leung, John P. Giesy, Jack C.H. Ip, Kevin K.Y. Ho, Guang-Jie Zhou, and Shan Liu
- Subjects
Imposex ,Ecology ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Zoology ,Biology ,Pollution ,Waste Management and Disposal ,Natural (archaeology) ,Water Science and Technology - Published
- 2021
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38. Imposex in Hexaplex trunculus at some sites on the North Mediterranean Coast as a base-line for future evaluation of the effectiveness of the total ban on organotin based antifouling paints
- Author
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Garaventa, F., Pellizzato, F., Faimali, M., Terlizzi, A., Medakovic, D., Geraci, S., Pavoni, B., Martens, K., editor, Queiroga, H., editor, Cunha, M. R., editor, Cunha, A., editor, Moreira, M. H., editor, Quintino, V., editor, Rodrigues, A. M., editor, Seroôdio, J., editor, and Warwick, R. M., editor
- Published
- 2006
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39. Imposex in Stramonita haemastoma from coastal sites of Cartagena, Colombia
- Author
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L. Sierra-Marquez, J. Sierra-Marquez, J. De la Rosa, and J. Olivero-Verbel
- Subjects
imposex ,bioacumulação ,pintura para barco ,compostos organoestânicos ,desenvolvimento do pênis ,toxicidade ,Science ,Biology (General) ,QH301-705.5 ,Zoology ,QL1-991 ,Botany ,QK1-989 - Abstract
Abstract Imposex is the development of male sexual characteristics caused by the toxic effects of some chemicals that acts as an endocrinal disruptor. Antifouling paints contain these chemicals. Cartagena lacks studies to indicate the extent of imposex in its coastal waters. The aim of this study was to determine the prevalence of imposex in the gastropod Stramonita haemastoma in Cartagena, Colombia. Specimens were collected during 2013 from locations of high and low influence of port activity. Morphometric measurements and the frequency of the occurrence of imposex were registered. The comparison among morphometric variables showed statistically significant differences between the two sites studied. Furthermore, the females of the S. haemastoma species presented an imposex frequency of 93.1% in Birds’ Island, Cartagena Bay, compared to 31.8% in La Bocana. The relative penis size index or RPLI (10.145 and 3.231) and vas deferens sequence index or VDSI (2.83 and 1.16), showed possible contamination by organotin compounds in both places.
- Published
- 2017
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40. Metales pesados e imposex en Thaisella chocolata (Gasteropoda: Muricidae) en Matarani, Arequipa, Perú
- Author
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Luna-Pacompea, Nathali, Juárez-Laguna, Fátima, Jaén-Rodriguez, Camila, Alvariño, Lorena, and Iannacone, José
- Subjects
sedimento ,sediment ,imposex ,disrupción endocrina ,caracol marino ,metales pesados ,marine snail ,endocrine disruption ,agua de mar ,heavy metals ,seawater - Abstract
Marine ecosystems have been affected by contamination from heavy metals and antifouling organotin paints, where the latter generate the imposex phenomenon in marine gastropods. The presence of heavy metals and imposex in the marine snail Thaisella chocolata was evaluated at the "El Faro" artisanal fishing landing stage and at approximately 2 km from said pier, located in Matarani (Arequipa, Peru), during the winter and spring of 2021. In addition, heavy metals in the water and in the marine sediment were evaluated. Heavy metals in the water, sediment and muscle tissue samples of T. chocolata were compared with national and international standards for environmental quality. Boron in the water exceeded the norm in both areas in the spring. No heavy metal exceeded the regulations in the sediment. The values of As, Cd and Cu and Se in the tissues of T. chocolata exceeded some of the eight international standards for comparison. The risk to human health from the consumption of marine mollusks evidenced the absence of non-carcinogenic risk based on the Target risk quotient (THQ) and the Hazard index (HI) for heavy metals in T. chocolata. Shell size and penis length in males in T. chocolata were correlated. The percentages of imposex (9.6%) were classified as low. The RPLI (relative penile length index), the RPLIest (standardized RPLI), and the VSDI index (vas deferens sequence index) ranged from I to II in T. chocolata presenting low severity. It is suggested to continue monitoring the levels of heavy metals and imposex in T. chocolata in the southern zone of Peru to improve management efficiency and to enforce national and international regulations., Los ecosistemas marinos se han visto afectados por la contaminación de metales pesados y de pinturas organoestañosas antiincrustantes, donde estos últimos generan el fenómeno de imposex en gasterópodos marinos. Se evaluó la presencia de metales pesados e imposex en el caracol marino Thaisella chocolata en el desembarcadero pesquero artesanal “El Faro” y a 2 km aproximadamente de dicho muelle, ubicados en Matarani (Arequipa, Perú), durante invierno y primavera de 2021. Además, se evaluaron los metales pesados en el agua y en el sedimento marino. Los metales pesados en las muestras de agua, sedimento y tejido muscular de T. chocolata fueron comparados con normativas nacionales e internacionales para la calidad ambiental. El boro en el agua sobrepasó la norma en las dos zonas en primavera. Ningún metal pesado sobrepasó la normativa en el sedimento. Los valores de As, Cd y Cu y Se en los tejidos de T. chocolata sobrepasaron en alguna de las ocho normas internacionales de comparación. El riesgo en la salud humana por el consumo de moluscos marinos evidenció ausencia de riego no carcinogénico en base al cociente de riesgo objetivo (THQ) y al índice de peligro (HI) por metales pesados en T. chocolata. El tamaño de la conchilla y la longitud del pene en los machos en T. chocolata estuvo correlacionado. Los porcentajes de imposex (9.6%) fueron catalogados como bajos. El RPLI (índice de la longitud relativa del pene), el RPLIest (RPLI estandarizado), y el índice de VSDI (índice de secuencia del conducto deferente) varió entre I a II en T. chocolata presentando baja severidad. Se sugiere continuar el monitoreo de los niveles de metales pesados y el imposex en T. chocolata en la zona sur del Perú, para mejorar la eficacia en la gestión y para hacer cumplir las reglamentaciones nacionales e internacionales.
- Published
- 2022
41. Exposure to tributyltin chloride induces penis and vas deferens development and increases RXR expression in females of the purple snail (Plicopurpura pansa)
- Author
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D Domínguez-Ojeda, AE Rojas-García, ML Robledo-Marenco, BS Barrón-Vivanco, and IM Medina-Díaz
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tributyltin ,imposex ,retinoid X receptor (RXR) ,purple snail ,Biology (General) ,QH301-705.5 - Abstract
Tributyltin (TBT) and its derivatives are widely used as antifouling paints for ships, resulting in their being released into the marine environment. Aquatic invertebrates, particularly marine gastropods, are extremely sensitive to TBT and undergo changes in the imposition of male secondary sex characteristics in response to exposure. This study aimed to evaluate the development of imposex and the expression of the retinoid X receptor (RXR) in tissues of Plicopurpura pansa (males and females) exposed to tributyltin chloride (TBTCl). The histological results showed a penis-like structure in imposexed female and an undeveloped vas deferens that lacked circular muscular layers. TBTCl treatment increased the messenger RNA (mRNA) of RXR in females with imposex. The highest level of mRNA RXR was found in the digestive gland and penis-forming area in females under in vivo exposure compared with control females. These results indicate that TBTCl modulates mRNA levels of RXR in females. mRNA RXR in imposex females and females exposed to TBTCl only was similar to that of males, indicating that RXR might contribute to the development of imposex. To our knowledge, this study is the first to show that TBTCl induces imposex and biphallia in this snail species, and that this effect is accompanied by an increase in RXR expression.
- Published
- 2014
42. Análisis de la evolución del imposex en Europa
- Author
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Universidade da Coruña. Facultade de Ciencias, Gil Fernández, Adrián, Universidade da Coruña. Facultade de Ciencias, and Gil Fernández, Adrián
- Abstract
[Resumen] El TBT (tributilo de estaño) es un compuesto organoestánnico que durante décadas se usó como agente biocida en las pinturas antiincrustantes de navíos. A partir de los años 80 se empezaron a percibir ciertos efectos perjudiciales en biota marina no objetivo del compuesto. Uno de los efectos más conocidos es el imposex que afecta a cientos de especies de gasterópodos marinos y consiste en la imposición sobre las hembras de características sexuales masculinas, lo que lleva a la esterilidad del individuo y la falta de reclutamiento poblacional. La venta, uso y distribución de esta clase de pinturas fueron prohibidas a nivel europeo en 2003 y a nivel global en 2008 por la organización marítima internacional (IMO). En esta revisión se analizan los distintos estudios de biomonitorización sobre el gasterópodo Nucella lapillus (L.) en varios países europeos para analizar la efectividad de dichas prohibiciones. Se analiza en cada estudio la secuencia del vaso deferente (VDSI) elaborando gráficos de cajas y bigotes para comparar su evolución. Tras este estudio se concluye que la tendencia europea apunta a una recuperación general en todos los países afectados. Sin embargo, es necesario continuar los estudios ya que ningún país (excepto Noruega) se ha recuperado totalmente, prestando especial atención a los posibles nuevos aportes que puedan haber de estos contaminantes., [Resumo] O TBT (tributilo de estaño) é un composto organoestánnico que durante décadas se usou como axente biocida nas pinturas antincrustantes de navíos. A partir dos anos 80 empezáronse a percibir certos efectos prexudiciais na biota mariña non obxectivo do composto. Un dos efectos máis coñecidos é o imposex que afecta a centos de especies de gasterópodos mariños e consiste na imposición sobre as femias de características sexuais masculinas, o que leva á esterilidade do individuo e á falta de reclutamento poblacional. A venda, uso e distribución desta clase de pinturas foron prohibidas a nivel europeo en 2003 e a nivel global en 2008 pola organización marítima internacional (IMO). Nesta revisión analízanse os distintos estudos de biomonitorización sobre o gasterópodo Nucella lapillus (L.) en varios países europeos para analizar a efectividade das devanditas prohibicións. Analízase en cada estudo a secuencia do vaso deferente (VDSI) elaborando gráficos de caixas e bigotes para comparar a súa evolución. Tras este estudo conclúese que a tendencia europea apunta a unha recuperación xeral en todos os países afectados. Con todo, é necesario continuar os estudos xa que ningún país (excepto Noruega) se recuperou totalmente, prestando especial atención ás posibles novas achegas que poidan haber destes contaminantes., [Abstract] TBT (tributyltin) is an organotin compound that for decades was used as a biocide agent in antifouling paints for ships. Since the 1980s, certain detrimental effects on non-target marine biota of the compound began to be perceived. One of the best known effects is imposex, which affects hundreds of species of marine gastropods and consists in the imposition of male sexual characteristics on females, leading to sterility of the individual and lack of population recruitment. The sale, use and distribution of this kind of paints were banned at European level in 2003 and at global level in 2008 by the International Maritime Organization (IMO). This review analyzes the different biomonitoring studies on the gastropod Nucella lapillus (L.) in several European countries to analyze the effectiveness of these bans. In each study, the sequence of the vas deferens (VDSI) is analyzed by elaborating box-and-whisker plots to compare their evolution. After this study, it is concluded that the European trend points to a general recovery in all the countries concerned. However, it is necessary to continue the studies since no country (except Norway) has fully recovered, paying special attention to possible new contributions of these pollutants.
- Published
- 2022
43. Fifteen years of imposex and tributyltin pollution monitoring along the Portuguese coast.
- Author
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Laranjeiro, Filipe, Sánchez-Marín, Paula, Oliveira, Isabel Benta, Galante-Oliveira, Susana, and Barroso, Carlos
- Subjects
BIOCIDES ,COASTAL zone management ,POLLUTION monitoring ,BIOINDICATORS ,NASSARIUS ,MARINE pollution ,COASTS - Abstract
IMO’s Anti-Fouling Systems convention banned the use of organotin-based antifouling systems in 2008 as the ultimate effort to stop tributyltin (TBT) inputs into the marine environment. One of the hazardous effects of TBT is imposex (the superimposition of male sexual characters onto gastropod females), a phenomenon that may cause female sterility and the gastropod populations decline. Despite previous European Union legislation had already been shown effective in reducing the imposex levels along the Portuguese coast, this study intends to confirm these decreasing trends after 2008 and describe the global evolution in the last 15 years. Imposex levels were assessed in two bioindicators – the dog-whelk Nucella lapillus and the netted-whelk Nassarius reticulatus (Gastropoda, Prosobranchia) – in 2011 and 2014, and the results were compared with previous years. Both species showed progressive decreasing trends in imposex levels over the last 15 years; median values of the vas deferens sequence index (VDSI) fell from 3.96 to 0.78 in N. lapillus and from 3.39 to 0.29 in N. reticulatus . The temporal/spatial evolution of imposex suggests an apparent shift of TBT hotspots, being now restricted to fishing ports and marinas in detriment of large commercial harbours where TBT levels fell rapidly. Butyltins were measured in the whole tissues of N. lapillus females collected in 2014: monobutyltin (MBT) varied from < DL (detection limit: 1 ng Sn/g) to 13 ng Sn/g dw, dibutyltin (DBT) from 2.2 to 27 ng Sn/g dw and TBT from 1.5 to 55 ng Sn/g dw. Although TBT body burden has declined over time, the butyltin degradation index ([MBT]+[DBT])/[TBT] exhibited values < 1 in c. a. 90% of the sites assessed, suggesting that recent TBT inputs are still widespread in the Portuguese coast eventually due to illegal use of TBT antifouling systems and TBT desorption from sediments. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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44. A temporal and spatial monitoring of organotin pollution in a harborside region of Brazil by imposex and ecological quality ratio using Leucozonia nassa.
- Author
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Costa, Mercia, Zamprogno, Gabriela, Otegui, Mariana, Morais, Letícia, Pedruzzi, Felipe, Dalbem, Gabriel, Silva, Daniele, and Resende, Allana
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ORGANOTIN compounds & the environment ,MARINAS ,TRIBUTYLTIN ,BIOCIDES ,BIOINDICATORS - Abstract
This study represents the first use of Leucozonia nassa (Mollusca-Gastropoda) in a program of long-term monitoring. Specimens of L. nassa were collected between 2006 and 2014 and analyzed for the occurrence of imposex in two areas in Southeastern Brazil, one control area and another characterized by the presence of many ports and marinas. Imposex was evaluated in nine sites based on the percentage of females exhibiting imposex (I%), relative penis length index and vas deferens sequence index, classical indices to evaluate tributyltin (TBT) impacts. Moreover, this study uses for the first time in a tropical environment the ecological quality ratio (EQR), an approach to verify the imposex levels as an indicator of the impact by organotin compounds according to the EU Water Framework Directive. The results confirm the occurrence of high levels of imposex in L. nassa with all the indices evaluated. Furthermore, the results also indicate that, despite the international ban, antifouling paints based on TBT are still possibly used in Brazil. In addition, this study shows that L. nassa has the characteristics that make it a suitable bioindicator to monitor TBT pollution, and that the use of the EQR may create important data regarding this problem. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
45. Sex and site-specific trends in veined rapa whelk (Rapana venosa) tributyltin bioaccumulation: considerations for biomonitoring.
- Author
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Harding, Juliana M., Unger, Michael A., Jestel, E. Alex, and Mann, Roger
- Abstract
The imposition of male sexual characteristics onto the female (imposex) is present in wild populations of the non-native veined rapa whelk (Rapana venosa) in Chesapeake Bay, USA but does not appear to compromise reproductive function. Cultured whelks were used to test two hypotheses: (1) Observed imposex metrics will be similar to tributyltin (TBT) water concentrations at each of three sites; (2) Male and imposex/female whelks from the same site will have similar TBT body burdens. Cultured 2-year-old whelks were transplanted to three field sites in the York River, USA at the onset of their second reproductive season. Transplant site mean TBT water concentrations ranged from 1.4 ± 0.77 to 64.2 ± 57.8 ng l−1. Imposex incidence was 100% after 28 weeks with an observed M:F:IF ratio of 81:0:92 across all sites. Imposex stages (median vas deferens scale index = 4) and reproductive output were similar across sites. The imposex severity (IS = penis length/shell length) increased with increasing TBT concentrations. The relative penis length (RPLI) and relative penis size (RPSI) indices were positively related to site-specific TBT levels. Male whelks accumulated significantly higher TBT concentrations than female whelks at the site with the highest TBT concentration. Mean TBT concentrations in whelk egg capsules were significantly higher than concentrations in male or female whelk tissue. Egg capsule deposition provides a depuration mechanism for female whelks to reduce body burden of lipophilic TBT. Sex, season and reproductive status should be considered when using gastropod bioaccumulation to monitor TBT effects. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
- Full Text
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46. Ecological quality status of the Adriatic coastal waters evaluated by the organotin pollution biomonitoring.
- Author
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Erdelez, A., Furdek Turk, M., Štambuk, A., Župan, I., and Peharda, M.
- Subjects
TERRITORIAL waters ,BIOLOGICAL monitoring ,ORGANOTIN compounds ,BIOCIDES - Abstract
The aim of this study was to evaluate the post-legislation change in tributyltin (TBT) pollution at Croatian Adriatic coast. Gastropod Hexaplex trunculus and sediments were collected, nearly 10 years after TBT based antifouling paints were banned, at 12 locations along the coast where a previous study was conducted in 2005. The study showed a decline of TBT levels over the investigated period, although all gastropods populations were highly affected by imposex meaning that prohibition did not result in the recovery of populations. The further aim was to propose the Ecological Quality Ratio (EQR) boundaries for potential use of H . trunculus as a principal bioindicator in the assessment of the ecological status of the Mediterranean regarding TBT pollution, under the Water Framework Directive (WFD). According to the proposed EQR classes, the WFD target for achieving the Good ecological status of the marine environment by 2015 was not reached. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
47. Intersexuality in aquatic invertebrates: Prevalence and causes.
- Author
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Grilo, Tiago F. and Rosa, Rui
- Subjects
- *
AQUATIC invertebrates , *INTERSEXUALITY in animals , *INVERTEBRATE sexual behavior , *PHYLA (Genus) , *ENDOCRINE disruptors - Abstract
This review is the first assembling information on intersexuality in aquatic invertebrates, from freshwater to estuarine and marine environments. Intersex is a condition whereby an individual of a gonochorist (separate sexes) species has oocytes or distinct stages of spermatogonia, at varying degrees of development, within the normal gonad of the opposite gender (i.e. spermatocytes in the ovary or oocytes in the testis), often involving alterations in the gonadal structure, reproductive tract or external genitalia. By the end of 2016 we found approximately 340 records of aquatic invertebrate species evidencing signs of intersexuality (or imposex), all comprised within the Phyla Mollusca and Arthropoda. Gastropod molluscs are by far the group with more examples documented (256 species), followed by crustaceans, i.e., decapods, copepods and amphipods. To our knowledge no further cases of intersexuality were known concerning other invertebrate taxa. Despite some reports suggesting that a baseline level of intersexuality may occur naturally in some populations, the causes are multifaceted and mostly linked with environmental contamination by estrogenic and organotin endocrine disrupting chemicals (EDCs), parasitism, and genetic/environmental sex determination abnormalities. A more comprehensive discussion about the origin of intersexuality, prevalence and causes, knowledge gaps and future research directions in the light of new omics scientific advances (genomics, proteomics and transcriptomics) is also provided. The lack of studies linking molecular responses of invertebrate intersex individuals to multiple stressors represents a true challenge to be further investigated in the future. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
48. Beyond imposex: other sexual alterations in a nassariid snail from Patagonia.
- Author
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Narvarte, Maite, Salas, María Cecilia, Avaca, María Soledad, Roche, María Andrea, Delucchi, Federico, Tartara, Matías, and Marcovecchio, Jorge
- Subjects
- *
NASSARIIDAE , *GASTROPODA , *MOLLUSKS , *TRIBUTYLTIN , *ORGANOMETALLIC compounds - Abstract
The occurrence of a penis in female gastropods has commonly been accepted as an indicator of tributyltin (TBT) pollution. During the surveys performed in Patagonian waters between 2002 and 2010, individuals ofBuccinanops deformiswith a short penis and an external vas deferens were initially considered as showing imposex. Doubt arose when different manifestations of the phenomenon were identified at the two sites with the densest populations of the species (San Antonio Bay, SAB, and Villarino). This led us to search at both locations for: (a) histological confirmation of sex, (b) butyltin measurements in sediments and snail tissues, and (c) incidence of trematode infestation. We found that both populations have individuals with a short penis. While all the inspected individuals from SAB were histologically identified as females (imposex), those from Villarino were identified as males. Trematodes were absent in individuals from SAB and showed very low prevalence in those from Villarino, with metacercariae found in the digestive gland. In snail tissues, butyltins were found mainly in the form of dibutyltin (DBT) in SAB and at negligible levels in Villarino. In sediments, butyltins were found only in the form of TBT, at higher levels in SAB than in Villarino. Thus, it became clear that our finding of a short penis is a manifestation of imposex on females from SAB related to the high TBT levels, whereas in Villarino it is a male trait, which is not related to TBT or a trematode infestation but may be a Dumpton syndrome-like abnormality. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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49. Rapid and sensitive determination of antifouling organotin compounds in sediments using Gas chromatography with Tandem MS (GC – MSMS / GC – QTOF)
- Author
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Kartal Çetintürk and Selma Ünlü
- Subjects
Imposex ,animal structures ,Health, Toxicology and Mutagenesis ,Soil Science ,010501 environmental sciences ,01 natural sciences ,Analytical Chemistry ,Biofouling ,Aquatic species ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Tandem ,Chemistry ,fungi ,010401 analytical chemistry ,Public Health, Environmental and Occupational Health ,food and beverages ,Sediment ,equipment and supplies ,Pollution ,0104 chemical sciences ,Environmental chemistry ,bacteria ,Gas chromatography - Abstract
Organotin compounds are causing deterioration effect on non-targeted aquatic species in the environment, such as shell anomalies in oysters and imposex in gastropods, even at concentrations as low ...
- Published
- 2020
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- View/download PDF
50. Endocrine disruption and altered sexual development in aquatic organisms: an invertebrate perspective
- Author
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W. J. Langston
- Subjects
Imposex ,0303 health sciences ,education.field_of_study ,Ecology ,Population ,Marine invertebrates ,010501 environmental sciences ,Aquatic Science ,Biology ,01 natural sciences ,03 medical and health sciences ,chemistry.chemical_compound ,chemistry ,Mimicry ,Tributyltin ,Endocrine system ,education ,Environmental quality ,030304 developmental biology ,0105 earth and related environmental sciences ,Invertebrate - Abstract
Contaminants causing sex-altering, endocrine disrupting-like (ED) effects, or otherwise influencing reproduction, have been of growing concern to humans for more than 50 years. They have also been a perturbing, though less well-studied, phenomenon in marine organisms, following the recognition of tributyltin (TBT)-induced imposex and population extinctions in (neo)gastropods in the 1970s. Whilst ED impacts in mammals and fish are characterized by mimicry or antagonism of endogenous hormones by environmental contaminants (acting through Nuclear Receptors which are present in all metazoans) much less is known regarding pathways to effects in invertebrates. Despite the absence of a defined steroidal/mechanistic component, the extent, severity and widespread nature of ED-like manifestations and altered sexual characteristics observed in marine invertebrates gives rise to comparable concerns, and have been a long-term component of the MBA's research remit. The manifestations seen in sensitive taxa such as molluscs and crustaceans confirm they are valuable indicators of environmental quality, and should be exploited in this capacity whilst we seek to understand the pervasiveness and underlying mechanisms. In so doing, invertebrate indicators address aims of organizations, such as the EEA, OECD, UNEP and WHO, charged with management and monitoring of chemicals and ensuring that adverse effects on humans and the environment are minimized (Bergman et al., 2013). In view of the recent general declines in marine biodiversity, and the potential contribution of ED-like phenomena, safeguarding against deleterious effects through increased research which links pollutant exposure with reproductive dysfunction among invertebrates, is seen as a high priority.
- Published
- 2020
- Full Text
- View/download PDF
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