26 results on '"Ferreri, Rosalia"'
Search Results
2. Automatic classification of acoustically detected krill aggregations: A case study from Southern Ocean
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Fontana, Ignazio, Barra, Marco, Bonanno, Angelo, Giacalone, Giovanni, Rizzo, Riccardo, Mangoni, Olga, Genovese, Simona, Basilone, Gualtiero, Ferreri, Rosalia, Mazzola, Salvatore, Lo Bosco, Giosué, and Aronica, Salvatore
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- 2022
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3. Fourier-transform near-infrared spectroscopy first application to age determination in European fish species: the case of the Atlantic horse mackerel from the central Mediterranean Sea.
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Basilone, Gualtiero, Lo Cicero, Gabriella, Fortuna, Miryam, Luviner, Anita, Ferreri, Rosalia, Aronica, Salvatore, Genovese, Simona, Giacalone, Giovanni, Fontana, Ignazio, and Bonanno, Angelo
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NEAR infrared spectroscopy ,MACKERELS ,ABSORPTION spectra ,AGE ,MARINE organisms - Abstract
Fourier-transform near-infrared spectroscopy (FT-NIRS) has recently been used to reduce the processing time for estimates of annual age in several fish species. The present study represents the first application of this technique to marine organisms from the European waters. Atlantic horse mackerel (Trachurus trachurus) from the central Mediterranean Sea was selected for its ecological role, its socioeconomic value, and because its age is regularly estimated by otolith reading under a stereomicroscope for stock assessment purposes. Absorption spectra of the whole otoliths were acquired by FT-NIRS across a multiyear dataset, obtained during acoustic surveys carried out in different regions of the central Mediterranean Sea. The acquired spectra were processed to optimize calibration models to predict age. The best linear models obtained by the optimizing procedure predicted age successfully with a coefficient of determination of 0.95-0.96, mean squared error of 0.5 years, and bias <0.03 years. Although regional calibration models were also obtained separately, the models with all regions combined appeared much more robust and encompassing the whole age range, suggesting its usefulness for the entire spatial distribution range considered in the preset study. The use of FT-NIRS allowed to successfully predict age for horsemackerel between the ages 1 and 14, with similar or better precision (and bias) of the traditional methods, also increasing the standardization by repeatability of age assignments. The preliminary results obtained by this study encourage further effort to fine-tune the calibration model for new species, in order to apply a precise, rapid, costeffective method for stock assessment purposes of Mediterranean fish resources. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Spawning ecology of the European anchovy (Engraulis encrasicolus) in the Strait of Sicily: Linking variations of zooplankton prey, fish density, growth, and reproduction in an upwelling system
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Basilone, Gualtiero, Ferreri, Rosalia, Barra, Marco, Bonanno, Angelo, Pulizzi, Maurizio, Gargano, Antonella, Fontana, Ignazio, Giacalone, Giovanni, Rumolo, Paola, Mazzola, Salvatore, Genovese, Simona, McBride, Richard, and Aronica, Salvatore
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- 2020
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5. Spatio-temporal patterns and environmental controls of small pelagic fish body condition from contrasted Mediterranean areas
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Brosset, Pablo, Fromentin, Jean-Marc, Van Beveren, Elisabeth, Lloret, Josep, Marques, Virginie, Basilone, Gualtiero, Bonanno, Angelo, Carpi, Piera, Donato, Fortunata, Čikeš Keč, Vanja, De Felice, Andrea, Ferreri, Rosalia, Gašparević, Denis, Giráldez, Ana, Gücü, Ali, Iglesias, Magdalena, Leonori, Iole, Palomera, Isabel, Somarakis, Stylianos, Tičina, Vjekoslav, Torres, Pedro, Ventero, Ana, Zorica, Barbara, Ménard, Frédéric, and Saraux, Claire
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- 2017
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6. First annulus formation in the European anchovy; a two-stage approach for robust validation
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Basilone, Gualtiero, Barra, Marco, Ferreri, Rosalia, Mangano, Salvatore, Pulizzi, Maurizio, Giacalone, Giovanni, Fontana, Ignazio, Aronica, Salvatore, Gargano, Antonella, Rumolo, Paola, Genovese, Simona, and Bonanno, Angelo
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- 2020
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7. Trophic relationships between anchovy (Engraulis encrasicolus) and zooplankton in the Strait of Sicily (Central Mediterranean sea): a stable isotope approach
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Rumolo, Paola, Fanelli, Emanuela, Barra, Marco, Basilone, Gualtiero, Genovese, Simona, Gherardi, Serena, Ferreri, Rosalia, Gargano, Antonella, Mazzola, Salvatore, and Bonanno, Angelo
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- 2018
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8. Age and Growth of European Sardine (Sardina pilchardus) in the Central Mediterranean Sea: Implication for Stock Assessment.
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Basilone, Gualtiero, Ferreri, Rosalia, Bonanno, Angelo, Genovese, Simona, Barra, Marco, and Aronica, Salvatore
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SARDINES , *FISH growth , *FISH populations , *FISH mortality - Abstract
Understanding the drivers of fish growth is essential for predicting productivity, stability, and resilience of exploited populations. For the European sardine (Sardina pilchardus) in the Strait of Sicily (Central Mediterranean Sea, GSA16), growth parameters or length at age estimates have never been published before. To fill this data gap, the length and age as well as the von Bertalanffy parameters (the most widely used growth model) were estimated. Data from landing samples during the period 2009–2019 were collected by two methods (purse seine and mid-water pelagic trawl). Temporal trends in average length at age, as well as an overall age-length key were obtained and compared with other areas across the geographical distribution range of sardine in the Mediterranean Sea. The observed age range was 0–3 years with most of the individuals belonging to Age 1 (52%) and Age 2 (43%). The mean length at age, for the entire study period, was 11.7 (±0.08) cm for Age 0; 13.4 (±0.09) cm for Age 1; 15 (±0.1) cm for Age 2; and 16.6 (±0.11) cm for Age 3. Furthermore, during the considered period, a reduction in the length at age was observed in the older classes (Age 2 and Age 3). The estimated parameters of the von Bertalanffy growth model were Linf = 18 (±1.15) cm, K= 0.459 (±0.018), and t0 = −1.99 (±0.008) and, accordingly, the mortality vector was obtained according to Gislason's model, for each age class, these values were 0.99 (0.98–1.02) C at Age 0; 0.71 (0.7–0.73) y−1 at Age 1; 0.6 (0.59–0.62) y−1 at Age 2; 0.54 (0.53–0.56) y−1 at Age 3; and 0.51 (0.49–0.53) y−1 at Age 4. Results appeared in agreement with literature from other areas of the Mediterranean Sea and suggested a poor condition status of the sardine stock in the GSA16. [ABSTRACT FROM AUTHOR]
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- 2023
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9. A Morphometric Approach to Understand Prokaryoplankton: A Study in the Sicily Channel (Central Mediterranean Sea).
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Maimone, Giovanna, Azzaro, Maurizio, Placenti, Francesco, Paranhos, Rodolfo, Cabral, Anderson Sousa, Decembrini, Franco, Zaccone, Renata, Cosenza, Alessandro, Rappazzo, Alessandro Ciro, Patti, Bernardo, Basilone, Gualtiero, Cuttitta, Angela, Ferreri, Rosalia, Aronica, Salvatore, and Ferla, Rosabruna La
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BIOTIC communities ,CELL size ,MICROBIAL ecology ,CELL morphology ,MARINE microbiology ,IMAGE analysis ,VOXEL-based morphometry - Abstract
A new understanding of plankton ecology has been obtained by studying the phenotypic traits of free-living prokaryotes in the Sicily Channel (Central Mediterranean Sea), an area characterised by oligotrophic conditions. During three cruises carried out in July 2012, January 2013 and July 2013, the volume and morphology of prokaryotic cells were assessed microscopically using image analysis in relation to environmental conditions. The study found significant differences in cell morphologies among cruises. The largest cell volumes were observed in the July 2012 cruise (0.170 ± 0.156 µm
3 ), and the smallest in the January 2013 cruise (0.060 ± 0.052 µm3 ). Cell volume was negatively limited by nutrients and positively by salinity. Seven cellular morphotypes were observed among which cocci, rods and coccobacilli were the most abundant. Cocci, although they prevailed numerically, always showed the smallest volumes. Elongated shapes were positively related to temperature. Relationships between cell morphologies and environmental drivers indicated a bottom-up control of the prokaryotic community. The morphology/morphometry-based approach is a useful tool for studying the prokaryotic community in microbial ecology and should be widely applied to marine microbial populations in nature. [ABSTRACT FROM AUTHOR]- Published
- 2023
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10. Fluid escape structures revealing volcanic and tectonic activity in the Graham Bank (Sicily Channel)
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Spatola, Daniele, Sulli, Attilio, Micallef, Aaron, Basilone, Luca, Pennino, Valentina, Interbartolo, Francesco, Basilone, Gualtiero, Bonanno, Angelo, Ferreri, Rosalia, Genovese, Simona, and Pulizzi, Maurizio
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Neotectonics -- Italy -- Sicily ,Volcanic eruptions -- Italy -- Sicily ,Geomorphology -- Research - Abstract
The Graham Bank (NW Sicily Channel, Central Mediterranean) is characterised by a complex seafloor morphology, where morphostructural highs, submarine plain, escarpments, and negative and positive relieves indicate a complex structural setting and the occurrence of seepage fluids. New high-resolution acoustic data (multibeam, Chirp profiles) and multi-channel profiles, allowed us to differentiate two main morphological sectors, and to identify several pockmarks and mounds linked to fluid escape phenomena. The eastern sector, corresponding to the volcanic edifices of the Graham Bank, is characterised by volcanic context with rough morphology, several mounds, focused seepage plumes and magmatic acoustic substrate, all related to the activity forming both the Graham Bank and the new volcanic cones here identified. The western sector displays a generally flat morphology dominated by Late Pleistocene-Holocene outer shelf deposits, where mounds and pockmarks with sub-circular and ellipsoidal shapes, V- to U-shaped in cross-section, are the prevailing features indicating the migration of fluids to the seafloor. These two areas are separated by a vertical deep fault forming a deeply incised channel with NW-SE direction. The latter is bordered by steep walls forming fault escarpments, which shed the eroded materials to the adjacent lower slope and deep-water zones. The overall morphostructural setting suggests a tectonic control in the morphological conformation of the seabed and in the distribution of both pockmarks and mounds. The aligned mounds have both NW-SE and NNW-SSE orientation, sometimes extending several hundred metres and forming hummocky surfaces. The aligned pockmarks are strictly comparable to the orientation of the faults related to the most recent tectonic activity. The good correlation between fluid escape structures and the main fault systems involving the kilometric sedimentary cover suggests that the degassing of fluids is rooted in depth revealing that extensional tectonics acts with very deep subvertical recent faults developing along and reactivating the Cenozoic (both Plio-Quaternary and Messinian) and Mesozoic tectonic systems., peer-reviewed
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- 2016
11. Variation in size at maturity by horse mackerel (Trachurus trachurus) within the central Mediterranean Sea: Implications for investigating drivers of local productivity and applications for resource assessments.
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Ferreri, Rosalia, McBride, Richard S., Barra, Marco, Gargano, Antonella, Mangano, Salvatore, Pulizzi, Maurizio, Aronica, Salvatore, Bonanno, Angelo, and Basilone, Gualtiero
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TRACHURUS trachurus , *BODY weight , *GONADS , *ESTUARINE ecology - Abstract
Abstract Understanding drivers of fish maturity are essential to predict the productivity, stability, and resiliency of exploited populations. In terms of horse mackerel (Trachurus trachurus), in the eastern Atlantic Ocean and the Mediterranean Sea, size at maturity estimates date back to the 1940s and throughout its range. However, many older estimates may not reflect current maturity rates. This is because past methods were imprecise, or environmental or fishing effects may change maturity rates, and some stock areas have been overlooked. To address this data gap for the Central Mediterranean Sea, female horse mackerel size at maturity was estimated for two areas: the Strait of Sicily and the Tyrrhenian Sea. All ovaries were assigned a reproductive phase based on macroscopic methods, and the reliability of this method (94%) was validated with a microscopic method (i.e., gonad histology). Although the collected females exhibited similar condition, in terms of total body weight at a given length, as well as similar gonad-somatic indices, the size at median maturity in the Strait of Sicily was smaller (161 mm total length [TL]) than in the Tyrrhenian Sea (176 mm TL). Future sampling in a series of years with contrasting levels of productivity may help identify whether this is a broad latitudinal trend, or due to specific oceanographic drivers, such as estuarine outflow into the Tyrrhenian Sea or upwelling in the Strait of Sicily. Meanwhile, resource assessments should consider that these two areas represent two phenotypic stocks. [ABSTRACT FROM AUTHOR]
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- 2019
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12. Report of the Workshop for maturity staging chairs (WKMATCH), 11–15 June 2012, Split, Croatia
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Saborido-Rey, Fran, Basilone, Gualtiero, Belcari, P., Ferreri, Rosalia, Kec, Vanja, Kjesbu, Olav S., Korta, María, Nash, Richard D. M., Villamor, Begoña, and Zorica, Barbara
- Abstract
59 páginas, 8 anexos, The recorded maturity stage at the time of observation is an important biological parameter to be used in the calculation of maturity ogives (and therefore of Spawning Stock Biomass), for the definition of the spawning season of a species, for the moni-toring of long-term changes in the spawning cycle, and for many other research needs regarding the biology of species. Thus, maturity data are fundamental part of the stock assessment process and hence a vast effort is put on validating the macro-scopic inspection of gonads. In the last decade a series of workshops addressed the maturity staging of different species with the objective of developing common ma-turity scales, decreasing discrepancies between laboratories and validating maturity staging through microscopic evaluation. A total of 11 of those workshops on species-specific maturity staging were revised here. These workshops have analysed 20 teleosts, elasmobranchs as a whole subclass, three orders of cephalopods and four crustacean species. The WKMAT 2007, and later WKMSCWHS 2007, proposed a six point maturity scale for both males and fe-males that have been used as a reference in the different maturity workshops to de-velop and adopt a common scale between laboratories for each species. A notable effort has been made by all workshop participants to standardize the existing maturi-ty scales and accommodate the standard scale proposed. All workshops acknowl-edged the biological differences between the reference scale stages. All workshops proposed new scales that although were generally consistent with WKMAT scale, showed several differences. As a result, the four stage scale proposed in WKMAT has generally not adopted, partially because such scale does not allow reflecting specific particularities, useful for a number of species., To overcome this, we propose the use a single scale of 4+2 stages or divisions which is believed to be universal, that is, it can be used for the majority of species, although viviparous and hermaphrodites may need some adaptation. This 6 stage codes and names should be used for all species and both sexes without exception; species-specific particularities should be reflected creating subdivisions and never modifying the 6 main stages. Using this proposed coding system, particularities of species and stocks can be addressed by each workshop (subdivisions), without losing consistency and traceability (divisions). In this way the code number of the divisions or main stages has the same biological meaning across species and laboratories. Some poten-tial subdivisions are proposed as well, for its facultative use in some batch spawners an in viviparous species. The merging of different stages should be avoided and in-stead a combined code should be used. In this manner the consistency of stages defi-nition and codes is maintained across species. The definition of each stage needs to be linked to biological phases and incorporate into its description species-specific aspects relevant for an easy identification of each stage. The use of the terminology for maturity stages considers a general scheme of the reproduction that can be applied to all male and female elasmobranchs and tele-ost fishes, including hermaphrodites and livebearers. A full glossary of terminology was compiled. Training (of the observers) is the major issue for maturity staging, and it should be strengthen within the umbrella of ICES., When staging maturity macroscopically timing of the sampling is critical to obtain reliable results. To define this period it is important to know the timing of the repro-ductive cycle, as this is species specific. If maturity staging outside the optimal peri-ods is required, this should be based on histological information. However, we suggest that whole mounts preparations are useful to validate macroscopic staging of ovaries being particularly useful to separate between early developing and develop-ing specimens, immature and regressing/regenerating specimens, or even specimens that have just completed a spawning season from those have not yet entered sexual maturity. Nevertheless, it is recommended that the whole-mounts method is careful-ly calibrated before taken into practical use. The maturity Workshops should discuss the new and general scale in their respective WKs by e-mail to assess the correspondence with the agreed scale, and evaluate the uncertainties and the problems this new general scale may cause. At the same time, ICES should ensure an appropriate attendance and a required level of basic knowledge, both on maturity studies and on the species targeted by the Workshop. Beyond of experts in the matter, the participants should be trained people, this can be achieved by training courses in ICES. We have revised and updated the Guidelines for Workshops on Maturity Staging, and provided general recommendations for future workshops., We reviewed a total of 148 stocks of 53 species from 8 ecoregions from which ICES provides some type of advice. In 88 stocks (59%) maturity data are not used or are used improperly. This includes the use of time invariant maturity ogives when annu-al ogives can be available. In 39 stocks (26%) the assessment uses a proper maturity ogive, but over a limited time period. Finally in only 21 stocks 14% of the total ad-vised stocks the maturity ogive has been estimated on regular basis and in these cases they are used properly in the assessment. Therefore, lack of data and/or poor quality is the main causes of maturity not being used. However, there is a general lack of information in the reports on how the maturity data was collected, ogive estimated, quality control and other relevant information. There is a need to determine what maturity data are required for assessment purposes, including how phenomena such as skipping spawning should be included in assessments. In spite of the effort on collecting maturity data, almost in 100% of the cases sex-specific ogives are combined without analysing the impact of this. Expert groups should provide comprehensive reports on how the maturity data is used, and more specifically, at least: the method used to estimate maturity, in which sex and how a sex-specific maturity ogive is used in the assessment, source of data (survey, commercial sampling), the time of the year when the sampling was conduct-ed, and years of proper estimation. The impact on the assessment of combining sex-specific maturity ogives should be analysed.
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- 2014
13. Reproductive strategy and fecundity of meagre Argyrosomus regius Asso, 1801 (Pisces: Sciaenidae): implications for restocking programs
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Gil, María Del Mar, Grau, Amalia, Basilone, Gualtiero, Ferreri, Rosalia, Palmer, Miguel, and This work has been funded by the Plan Nacional de Cría de Corvina 2005-2007 (JACUMAR MAPA-CC.AA.) and by the INIA projects RTA-2007 00033-C02-01 and RTA-2011 00056-C02-00
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Argyrosomus regius ,talla de madurez ,edad de madurez ,época reproductiva ,fecundidad potencial ,mar Mediterráneo ,length at maturity ,age at maturity ,reproductive season ,potential fecundity ,Mediterranean Sea - Abstract
Because the meagre (Argyrosomus regius) is not currently found around the Balearic Islands (western Mediterranean), the Balearic government is carrying out a restocking programme to recover its population. The success of this programme is critically dependent on improved knowledge of the meagre’s life cycle, and particularly its reproductive biology. Data on key reproductive parameters based on both reared and wild specimens are reported here. Histological examinations and gonadosomatic indices from 342 reared specimens demonstrated that 1) the potential reproductive season ranged from April to June and peaked in May, and 2) length at maturity (L50) was 49.3 cm for males and 57.2 cm for females, age at maturity (A50) was 2.7 years for males and 3.5 years for females, and weight at maturity (W50) was 1396 g for males and 1892 g for females. Histological examinations of 37 wild fish from Cádiz (SW Spain) demonstrated that the meagre has determinate fecundity. The annual potential fecundity of reared females ranged from 0.9 to 4.2 million oocytes, which is exponentially dependent upon female size., La corvina (Argyrosomus regius) actualmente no se encuentra en las Islas Baleares (Mediterráneo Occidental) y, por tanto, se están realizando esfuerzos para recuperar su población a través de un programa de repoblación que se está llevando a cabo por el Gobierno Balear. El éxito del programa de recuperación depende fundamentalmente de la mejora de los conocimientos del ciclo de vida de la corvina, y en particular de su biología reproductiva. Este estudio presenta datos sobre los principales parámetros reproductivos de la especie, basándose tanto en ejemplares criados en cautividad como salvajes. Los exámenes histológicos e índices gonadosomáticos de 342 especímenes criados en cautividad demostraron lo siguiente: 1) la potencial época de puesta se extendió de abril a junio y alcanzó su punto máximo en mayo, y 2) la talla de madurez (L50) fue de 49.3 cm para los machos y 57.2 cm para las hembras, la edad de madurez (A50) fue de 2.7 años para los machos y 3.5 años para las hembras, y el peso de madurez (W 50) fue de 1396 g para los machos y 1892 g para las hembras. Los exámenes histológicos de 37 peces salvajes procedentes de Cádiz (SO de España) demostraron que la corvina tiene fecundidad determinada. La fecundidad potencial anual de las hembras criadas en cautividad, la cual está exponencialmente relacionada con el tamaño de la hembra, osciló entre 0.9 y 4.2 millones de ovocitos.
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- 2013
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14. Effects of habitat conditions at hatching time on growth history of offspring European anchovy, Engraulis encrasicolus, in the Central Mediterranean Sea.
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Basilone, Gualtiero, Ferreri, Rosalia, Mangano, Salvatore, Pulizzi, Maurizio, Gargano, Antonella, Barra, Marco, Mazzola, Salvatore, Fontana, Ignazio, Giacalone, Giovanni, Genovese, Simona, Aronica, Salvatore, and Bonanno, Angelo
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EGG incubation , *FISH ecology , *FISH habitats , *ENGRAULIS encrasicolus , *FISH mortality - Abstract
The knowledge of the growth history in young fishes represents an important aspect of fishery ecology. This is especially relevant in short-living species like European anchovy, since they suffer a high mortality rate in their early life stages until recruitment. Although it is well known that habitat condition significantly affects spawning dynamics of fishes, it is not yet clear if these conditions affect growth trajectories during the early life stage’s critical period. Otolith microstructure analysis has been proven a useful tool to back-calculate growth history of young fishes. Thus, we analysed the effect of habitat variability on their growth history using otolith microstructures and environmental variables obtained from satellite imagery. Growth trajectories in juvenile anchovies, collected in two recruitment surveys carried out in 2004 and 2005 in the Strait of Sicily, were characterized by means of three indices within the fast growing period: the maximum increment width, the mean value of increment width, and the time extension of the fast growing period. Obtained results evidenced a clear effect of environmental conditions, particularly of sea surface temperature and chlorophyll-a concentration, on the growth histories of juveniles of anchovy. Furthermore, delayed effects of environmental conditions at hatching time on the forthcoming growth dynamics were discussed. [ABSTRACT FROM AUTHOR]
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- 2018
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15. Liver melanomacrophage centres and CYP1A expression as response biomarkers to environmental pollution in European anchovy (Engraulis encrasicolus) from the western Mediterranean Sea.
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Basilone, Gualtiero, Gargano, Antonella, Corriero, Aldo, Zupa, Rosa, Santamaria, Nicoletta, Mangano, Salvatore, Ferreri, Rosalia, Pulizzi, Maurizio, Mazzola, Salvatore, Bonanno, Angelo, and Passantino, Letizia
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MACROPHAGES ,CYTOCHROME P-450 ,ENGRAULIS encrasicolus ,MARINE pollution - Abstract
The goal of the present study was to verify the suitability of using melanomacrophage centres (MMCs) as response biomarkers of marine pollution in European anchovy, which are short-lived, migratory, small pelagic fish. This suitability was verified by analysing the MMC density and cytochrome P450 monooxygenase 1A (CYP1A) expression in livers of anchovies from four areas of southern Italy. Age 2 anchovies sampled from three areas exposed to pollutants of industrial/agricultural origin (Gulf of Gela, Mazara del Vallo and Gulf of Naples) showed liver areas occupied by MMCs and numbers of MMCs that were significantly higher than those in the anchovies from Pozzallo, which is a marine area not subjected to any source of pollution. Anti-CYP1A immunoreactivity was observed in the hepatocytes of all specimens sampled from the Gulf of Gela. These findings suggest the utility of liver MMCs as biomarkers of exposure to pollutants in this small pelagic fish. [ABSTRACT FROM AUTHOR]
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- 2018
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16. The observed oogenesis impairment in greater amberjack Seriola dumerili (Risso, 1810) reared in captivity is not related to an insufficient liver transcription or oocyte uptake of vitellogenin.
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Pousis, Chrysovalentinos, Mylonas, Constantinos C., De Virgilio, Caterina, Gadaleta, Gemma, Santamaria, Nicoletta, Passantino, Letizia, Zupa, Rosa, Papadaki, Maria, Fakriadis, Ioannis, Ferreri, Rosalia, and Corriero, Aldo
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YELLOWTAIL ,OVUM ,VITELLOGENINS ,AQUACULTURE ,OOGENESIS - Abstract
The greater amberjack Seriola dumerili is an excellent candidate for the Mediterranean aquaculture, due to its large body size and high growth rate, as well as its high flesh quality and commercial value worldwide. For its successful incorporation in the aquaculture industry, an in-depth understanding of the reproductive function of the species under rearing conditions is necessary, since completion of oogenesis in captivity is currently a bottleneck for the commercial production of the species. Liver and ovary samples from wild and captive-reared greater amberjack females were collected at three different phases of the reproductive cycle: early gametogenesis (EARLY, late April-early May), advanced gametogenesis (ADVANCED, late May-early June) and spawning (SPAWNING, late June-July). The cDNAs of three vitellogenins (VtgA, VtgB and VtgC) were partially sequenced and a qRT-PCR for their expression was used to compare ovarian maturity stage and liver vitellogenin transcript levels between wild and captive-reared individuals. An extensive atresia of late vitellogenic follicles, which prevented any further oocyte development and spawning was observed in captive-reared individuals during the ADVANCED phase. The expression levels of the three vitellogenins, as well as the amount of yolk globules in vitellogenic oocytes, did not differ significantly between captive-reared and wild females, indicating that the observed oogenesis impairment in greater amberjack reared in captivity was not related to an insufficient liver synthesis or a reduced oocyte uptake of vitellogenin. [ABSTRACT FROM AUTHOR]
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- 2018
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17. Yolked Oocyte Dynamics Support Agreement between Determinate- and Indeterminate-Method Estimates of Annual Fecundity for a Northeastern United States Population of American Shad.
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McBride, Richard S., Ferreri, Rosalia, Towle, Emilee K., Boucher, Jason M., and Basilone, Gualtiero
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AMERICAN shad , *FISH fertility , *AGRICULTURAL egg production , *OVUM physiology , *FISH populations , *BIOGEOGRAPHY - Abstract
Reports of American shad fecundity identify two important themes regarding egg production in fishes. First, geographic variation occurs and is biologically meaningful. Shad annual fecundity decreases with increasing latitude, but predicted lifetime fecundity does not, because of a counter-gradient of survival probability, all of which can explain the adaptive significance of natal homing. Second, the appropriate method of measuring fecundity depends on the pattern of oocyte development. Historically, the relatively simple determinate-fecundity method was used; however, a recent study in a Virginia river indicates that this method may be biased, requiring the more complicated indeterminate method. We address both themes with collections from the 2015 shad spawning run in the Connecticut River, USA. Criteria for using a determinate method were satisfied for this northern population: 1) a size gap evident in the oocyte size frequency distribution, indicating group-synchronous development of yolked oocytes; 2) a decline, early in spawning, in the standing stock of yolked oocytes; and 3) low levels of atresia at the end of spawning. The determinate-method estimate of American shad annual (2015) fecundity (303,000 ± 73,400; mean ± sd) overlapped historic estimates for this and a neighboring river. The indeterminate-method estimate of annual (2015) fecundity (311,500 ± 4,500 sd) was not significantly different from the determinate-method estimate (Student’s t-test, P > 0.05). In contrast, indeterminate-method estimates of annual fecundity for a Virginia population were twice as high as that measured by the determinate method in the past. This can all be explained by fundamentally different patterns of oogenesis (i.e., group synchrony versus asynchrony with respect to yolk development) at different latitudes. American shad, which is distributed within its native range from the Canadian maritimes to Florida, USA (50–30°N), may be particularly well suited to evaluate intra-specific variation in oocyte development, a relatively unexplored life history trait. [ABSTRACT FROM AUTHOR]
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- 2016
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18. Seasonal variation of reproductive traits of the caramote prawn in the Gulf of Tunis.
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JAZIRI, Hela, FERRERI, Rosalia, KHOUFI, Widien, EL FEHRI, Safouene, BEN MERIEM, Sadok, PULIZZI, Maurizio, MANGANO, Salvatore, BONANNO, Angelo, MAZZOLA, Salvatore, and BASILONE, Gualtiero
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SHRIMPS , *SEASONAL variations of diseases , *AQUACULTURE , *SPAWNING , *AQUATIC resources - Abstract
The caramote prawn, Melicertus kerathurus, is a Penaeidae species inhabiting the Mediterranean Sea and the Est Atlantic Ocean. Caramote prawn represents a commercially important species in terms of both aquaculture and fishing; however, there is poor information on its reproductive biology in Mediterranean and, particularly, in Tunisian waters. To fulfil such a gap, monthly samples of caramote prawn were collected along the northern Tunisian coast throughout one year. Ovaries maturity data, obtained by histological analysis, together with reproductive and condition indices, indicated the main spawning season extends from April to August, with a clear peak in July-August. However, gonadic production still persists during September-December, although at lower levels. The seasonal patterns of somatic and gonadic conditions suggested that energy reserves, during the main spawning period, were invested both in gonadic and body production; but males and females appeared to devote differently such energy reserves. During the spawning peak, females revealed both good somatic and gonadic conditions simultaneously, while males displayed worse body conditions. Monthly sea surface temperature (SST) showed a high level of pattern correspondence with ovary maturity phase and gonadosomatic index (GSI); but a strong linear relationship between SST and GSI in the study area was observed only for males. Such results increased reproductive biology knowledge, therefore allowing to improve the management quality of both wild caramote prawn stocks and reared populations. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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19. Reproductive traits and seasonal variability of Merluccius merluccius from the Tunisian coast.
- Author
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Khoufi, Widien, Ferreri, Rosalia, Jaziri, Héla, El Fehri, Safouène, Gargano, Antonella, Mangano, Salvatore, Ben Meriem, Sadok, Romdhane, Mohamed Salah, Bonanno, Angelo, Aronica, Salvatore, Genovese, Simona, Mazzola, Salvatore, and Basilone, Gualtiero
- Abstract
Merluccius merluccius is an economically and ecologically important demersal species inhabiting the Atlantic Ocean and the Mediterranean Sea; however, reproductive knowledge about this species, along the North African coast is still missing. Monthly samples were collected from November 2010 to October 2011 along the North Tunisian coast. Morphometric parameters were measured, and histological preparations of gonadic tissues provided detailed information on the reproductive biology. Ovary maturity data showed a protracted spawning season throughout the year, with peaks in January, April and August. In females of M. merluccius, seasonal variability in weight and length were noticed, with higher values in the first part of the study period (November–April) than from May to October. Analysing separately these two periods, significant relationships were observed between gonadic maturation indices and the somatic and gonadic indices, suggesting a seasonal differential use of energy intake. From November to May the fish alternate the use of their energy for body growth and reserves for later uses (i.e fat, muscle and liver mass) or for gonadic growth. From June to October the energy is converted mainly into gonad weight and less to somatic growth. The maturity ogives obtained by macroscopic and histological maturity staging methods showed significant differences; however, in both cases the length at first maturity estimates were around 29 cm. Nonetheless, when selecting the main spawning period, the L50 estimation was heavily reduced to 24 cm, suggesting careful attention in the selection of the samples to be used specially for fishery management purposes. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
- Full Text
- View/download PDF
20. Habitat Selection Response of Small Pelagic Fish in Different Environments. Two Examples from the Oligotrophic Mediterranean Sea.
- Author
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Bonanno, Angelo, Giannoulaki, Marianna, Barra, Marco, Basilone, Gualtiero, Machias, Athanassios, Genovese, Simona, Goncharov, Sergey, Popov, Sergey, Rumolo, Paola, Di Bitetto, Massimiliano, Aronica, Salvatore, Patti, Bernardo, Fontana, Ignazio, Giacalone, Giovanni, Ferreri, Rosalia, Buscaino, Giuseppa, Somarakis, Stylianos, Pyrounaki, Maria-Myrto, Tsoukali, Stavroula, and Mazzola, Salvatore
- Subjects
HABITATS ,PELAGIC fishes ,BIOMASS ,BIOLOGICAL adaptation ,PRINCIPAL components analysis ,ECOSYSTEMS - Abstract
A number of scientific papers in the last few years singled out the influence of environmental conditions on the spatial distribution of fish species, highlighting the need for the fisheries scientific community to investigate, besides biomass estimates, also the habitat selection of commercially important fish species. The Mediterranean Sea, although generally oligotrophic, is characterized by high habitat variability and represents an ideal study area to investigate the adaptive behavior of small pelagics under different environmental conditions. In this study the habitat selection of European anchovy Engraulis encrasicolus and European sardine Sardina pilchardus is analyzed in two areas of the Mediterranean Sea that largely differentiate in terms of environmental regimes: the Strait of Sicily and the North Aegean Sea. A number of environmental parameters were used to investigate factors influencing anchovy and sardine habitat selection. Acoustic surveys data, collected during the summer period 2002–2010, were used for this purpose. The quotient analysis was used to identify the association between high density values and environmental variables; it was applied to the entire dataset in each area in order to identify similarities or differences in the “mean” spatial behavioral pattern for each species. Principal component analysis was applied to selected environmental variables in order to identify those environmental regimes which drive each of the two ecosystems. The analysis revealed the effect of food availability along with bottom depth selection on the spatial distribution of both species. Furthermore PCA results highlighted that observed selectivity for shallower waters is mainly associated to specific environmental processes that locally increase productivity. The common trends in habitat selection of the two species, as observed in the two regions although they present marked differences in hydrodynamics, seem to be driven by the oligotrophic character of the study areas, highlighting the role of areas where the local environmental regimes meet ‘the ocean triad hypothesis’. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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21. Validation of macroscopic maturity stages according to microscopic histological examination for European anchovy.
- Author
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Ferreri, Rosalia, Basilone, Gualtiero, D'Elia, Marta, Traina, Anna, Saborido-Rey, Francisco, and Mazzola, Salvatore
- Subjects
- *
FISHERY resources , *ANCHOVY fisheries , *SURVEYS , *GENITALIA , *CLASSIFICATION , *MARINE resources - Abstract
The identification and classification of macroscopic maturity stages plays a key role in the assessment of small pelagic fishery resources. The main scientific international commissions strongly recommend standardizing methodologies across countries and scientists. Unfortunately, there is still a great deal of uncertainty concerning macroscopic identification, which remains to be validated. The current paper analyses reproductive data of European anchovy ( Engraulis encrasicolus L. 1758), collected during three summer surveys (2001, 2005 and 2006) in the Strait of Sicily, to evaluate the uncertainty in the macroscopic maturity stage identification and the reliability of the macroscopic adopted scale. On board the survey vessels, the maturity stage of each fish was determined macroscopically by means of an adopted maturity scale subdivided in six stages. Later, at the laboratory, the gonads were prepared for histological examination. The histological slides were analysed, finally assigning the six maturity stages for macroscopic examinations. A correspondence table was obtained with the proportion and number of matches between the two methods. The results highlight critical aspects in the ascription of macroscopic maturity stages, particularly for the present research aim. Different recommendations were evaluated depending on the scope of the study conducted on maturity ( e.g. daily egg production, fecundity and maturity ogive computation). The most interesting results concern the misclassification of stage IV and stages III and V (the most abundant), which confirms their macroscopic similarity. Although the results are based on a small number of samples, the advantages and disadvantages of macroscopic and histological methods are discussed with the aim to increase the accuracy of correct identification and to standardize macroscopic maturity ascription criteria. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
22. New Evaluation of Postovulatory Follicle Degeneration at High-Temperature Regimes Refines Criteria for the Identification of Spawning Cohorts in the European Anchovy (Engraulis encrasicolus).
- Author
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Ferreri, Rosalia, Barra, Marco, Gargano, Antonella, Aronica, Salvatore, Bonanno, Angelo, Genovese, Simona, Rumolo, Paola, Basilone, Gualtiero, Peñaranda, David Sánchez, and Olivotto, Ike
- Subjects
- *
ENGRAULIS encrasicolus , *SOCIAL degeneration , *BIOLOGICAL fitness , *FISH populations , *BROOD stock assessment , *WATER temperature , *FISHERY management - Abstract
Simple Summary: Wide fluctuations in abundance arising from variations in reproductive success are characteristic of many marine fish populations, including several pelagic fish species. The European anchovy is an economically and ecologically important resource, representing one of the most abundant species of the total Mediterranean fishery production. According to recommendations by the European Union, management plans should improve estimates of model parameters or biomass evaluation to provide a sustainable stock exploitation. The proportion of females spawning per day is one of the main parameters, including ichthyoplankton methods, for spawning biomass evaluation and is usually assessed by the postovulatory follicle (POF) method. Because of POF resorption rate is species-specific and influenced by residence temperature, the application of this method needs validation for species and area. This manuscript aimed to evaluate the resorption rate of postovulatory follicles in European anchovy in the central Mediterranean Sea, describing each degeneration stage based upon its histological features and estimating the duration of each POF stage in relation to water temperature experienced by the target species during the spawning peak. The provided results should allow for methodological advances in estimating the spawning biomass and in studying of reproductive output fluctuations, particularly for sustainable exploitation purposes. Accurate stock assessment estimates of fish resources are essential in fishery management. Wide fluctuations in abundance arising from variations in reproductive success are characteristic of many marine fish populations, including multiple spawner species. The proportion of females spawning per day is crucial in the application of egg production methods for spawning biomass evaluation and, usually, is assessed by postovulatory follicle (POF) method. Describing each degeneration stage of POF based upon its histological features allows for obtaining an aging key for postovulatory follicles. The commercially valuable European anchovy (Engraulis encrasicolus) was selected as a case study, which breeds during the summer in temperate waters (24 °C–25 °C). A collection of ovary slides, sampled in the central Mediterranean Sea during the spawning peak, provided a 24 h cycle coverage. These observations allowed us to evaluate the duration of each POF stage at water temperature experienced by anchovy in the study area. Present results demonstrated the POF degeneration progress at a faster rate than reported by previous investigations, carried out in cooler oceanic waters. Furthermore, the present study displayed the presence of two anchovy spawning cohorts sampled along a 24-h cycle. Therefore, this study not only provides useful insight for more accurate POF degeneration evaluation in temperate waters, but also suggests that current estimates should be complemented with validation studies according to different temperature regimes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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23. VITELLOGENIN AS A BIOMARKER OF EXPOSURE TO ENDOCRINE DISTRUPTORS IN TWO SPECIES OF MULLIDAE, Mullus barbatus AND Mullus surmuletus.
- Author
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RAFFA, Alessandra, GARGANO, Antonella, FERRERI, Rosalia, PAPPALARDO, Anna Maria, MAÑANOS, Evaristo, and FERRITO, Venera
- Subjects
VITELLOGENINS ,BIOMARKERS ,SPECIES - Published
- 2021
24. Automatic classification of acoustically detected krill aggregations: A case study from Southern Ocean
- Author
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Ignazio Fontana, Marco Barra, Angelo Bonanno, Giovanni Giacalone, Riccardo Rizzo, Olga Mangoni, Simona Genovese, Gualtiero Basilone, Rosalia Ferreri, Salvatore Mazzola, Giosué Lo Bosco, Salvatore Aronica, Fontana, Ignazio, Barra, Marco, Bonanno, Angelo, Giacalone, Giovanni, Rizzo, Riccardo, Mangoni, Olga, Genovese, Simona, Basilone, Gualtiero, Ferreri, Rosalia, Mazzola, Salvatore, Lo Bosco, Giosué, and Aronica, Salvatore
- Subjects
Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni ,Environmental Engineering ,Ross Sea ,Settore INF/01 - Informatica ,Ecological Modeling ,k-means ,Acoustic ,Krill ,Internal validation indices ,Software ,Hierarchical clustering - Abstract
Acoustic surveys represent the standard methodology to assess the spatial distribution and abundance of pelagic organisms characterized by aggregative behaviour. The species identification of acoustically observed aggregations is usually performed by taking into account the biological sampling and according to expert-based knowledge. The precision of survey estimates, such as total abundance and spatial distribution, strongly depends on the efficiency of acoustic and biological sampling as well as on the species identification. In this context, the automatic identification of specific groups based on energetic and morphological features could improve the species identification process, allowing to improve the precision of survey estimates or to overcome problems related to biases in biological sampling. In the present study, we test the use of well-known unsupervised clustering methods focusing on two important krill species namely Euphausia superba and Euphausia crystallorophias. In order to obtain a reference classification, the observed echoes were first classified according to specific criteria based on two parameters accounting for the acoustic response at 38 kHz and 120kHz. Different clustering methods combined with three distance metrics were then tested working on a wider set of parameters, accounting for the depth of insonified aggregation as well as for energetic and morphological features. The clustering performances were then evaluated by comparing the reference classification to the one obtained by clustering. Obtained results showed that the k-means performs better than the considered hierarchical methods. Our findings also evidenced that working on a specific set of variables rather than on all available ones highly impact k-means performances.
- Published
- 2022
25. Linking spatial distribution and feeding behavior of Atlantic horse mackerel (Trachurus trachurus) in the Strait of Sicily (Central Mediterranean Sea).
- Author
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Rumolo, Paola, Basilone, Gualtiero, Fanelli, Emanuela, Barra, Marco, Calabrò, Monica, Genovese, Simona, Gherardi, Serena, Ferreri, Rosalia, Mazzola, Salvatore, and Bonanno, Angelo
- Subjects
- *
TRACHURUS trachurus , *PELAGIC fishes , *CONTINENTAL shelf , *GASTROINTESTINAL content analysis - Abstract
The Atlantic horse mackerel ( Trachurus trachurus ) is a semi-pelagic fish species with a wide geographical distribution and commonly found on the continental shelf. In recent years, the species has received some attention due to its ecological role in pelagic food webs. Stable isotope of nitrogen and carbon (δ 15 N and δ 13 C) and Stomach Content Analysis (SCA) of T. trachurus were adopted as tools to provide necessary knowledge on its feeding habits in the Strait of Sicily. The strong correlation found between δ 15 N and δ 13 C values with body length, together with significant ontogenetic shift evidenced by SCA, could be associated to changes in food availability, which in turn is triggered by environmental conditions. Spatial distribution of T. trachurus in the study area, mainly for small and medium size specimens, is linked to lower temperature, salinity and Photosynthetically Active Radiation (PAR sat ) values with higher aggregations on the Adventure Bank (i.e., an area characterized by periodic upwelling events). Larger size specimens mostly inhabited shallower waters characterized by higher temperature, salinity and PAR values, typical of the central-eastern part of the study area. Our results support the hypothesis that feeding behavior of T. trachurus is strictly linked to environmental factors (i.e. chiefly oceanographic conditions of the water column and day duration) that in turn influences the distribution of its prey. Findings can supply knowledge needed for improving fish stock management and promoting plans able to take into account also local ecosystem analysis. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
26. Spatio-temporal dynamics of a planktonic system and chlorophyll distribution in a 2D spatial domain: matching model and data.
- Author
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Valenti D, Denaro G, Ferreri R, Genovese S, Aronica S, Mazzola S, Bonanno A, Basilone G, and Spagnolo B
- Subjects
- Chlorophyll A, Mediterranean Sea, Models, Theoretical, Seasons, Spatio-Temporal Analysis, Temperature, Chlorophyll analysis, Phosphates analysis, Phytoplankton growth & development, Seawater analysis
- Abstract
Field data on chlorophyll distribution are investigated in a two-dimensional spatial domain of the Mediterranean Sea by using for phytoplankton abundances an advection-diffusion-reaction model, which includes real values for physical and biological variables. The study exploits indeed hydrological and nutrients data acquired in situ, and includes intraspecific competition for limiting factors, i.e. light intensity and phosphate concentration. As a result, the model allows to analyze how both the velocity field of marine currents and the two components of turbulent diffusivity affect the spatial distributions of phytoplankton abundances in the Modified Atlantic Water, the upper layer of the water column of the Mediterranean Sea. Specifically, the spatio-temporal dynamics of four phytoplankton populations, responsible for about 80% of the total chlorophyll a, are reproduced. Results for phytoplankton abundances obtained by the model are converted in chlorophyll a concentrations and compared with field data collected in twelve marine sites along the Cape Passero (Sicily)- Misurata (Libya) transect. Statistical checks indicate a good agreement between theoretical and experimental distributions of chlorophyll concentration. The study can be extended to predict the spatio-temporal behaviour of the primary production, and to prevent the consequent decline of some fish species in the Mediterranean Sea.
- Published
- 2017
- Full Text
- View/download PDF
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