5 results on '"heteroquelia"'
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2. Population biology and relative growth of the crab Minuca mordax (Smith, 1870) (Crustacea, Decapoda, Ocypodidae) in the Igaraçu River, Parnaíba, state of Piauí, Brazil
- Author
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Sidely Gil Alves Vieira dos Santos, Luiz Gonzaga Alves dos Santos Filho, Lissandra Corrêa Fernandes-Goés, and João Marcos de Góes
- Subjects
allometry ,fiddler crab ,heteroquelia ,reproductive period ,sex ratio ,Science ,Biology (General) ,QH301-705.5 - Abstract
This study aimed to investigate the population biology of Minuca mordax in the Igaraçu River, Parnaíba, analyzing frequency distribution in size classes, reproductive period, relative growth, morphological sexual maturity, sex ratio and heterochely. The crabs were manually collected, randomly, by two people for 1 hour, in the representative months of the dry season (September to November) and rainy (April to June). In laboratory the crabs were identified, separated according to sex and measured. A total of 610 samples were captured, with 453 males and 157 females. The average size of carapace width (CW) was significantly different (p < 0.05) between males (17.21 ± 3.68 mm) and females (15.06 ± 3.18 mm). The distribution of the crabs in size classes was unimodal for both sexes. The morphological sexual maturity obtained for males was 12.42 mm CW and females was 10.05 mm CW. The sex ratio for the population was 1:0.35 (male: female), with significant difference from the expected ratio of 1:1. The heterochely was observed only in males of the species (224 right-handed and 229 sinister). Subsequently, other on-site observations were carried out monthly, from February/2011 to January/2012 to observe ovigerous females and determine the reproductive period. Females with eggs were observed only from March to June, corresponding to the rainy season in the region. The results found in the present study are similar to those observed in other populations of violinist crabs and suggest that the population is stable in the environment. The present study provides subsidies for the conservation of the species in the Igaraçu River.
- Published
- 2020
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3. Morphometry of the freshwater prawn Macrobrachium brasiliense (Caridea: Palaemonidae) and its relationship with reproductive strategy
- Author
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Santos Nogueira, Caio, Almeida, Ariádine Cristine, Santos Nogueira, Caio, and Almeida, Ariádine Cristine
- Abstract
During ontogeny, the allocation of energy can differ throughout the life cycle of a species, especially from juvenile to adult. The present study aimed to describe the relative growth, heterochely, and laterality patterns of the freshwater prawn Macrobrachium brasiliense. Carapace length (CL), abdomen length (AL), left cheliped length (LCL), right cheliped length (RCL), and abdomen width (AW) of males and females were measured. Differences in the morphometric relationships between juveniles and adults were evaluated using analysis of covariance (ANCOVA) and linear regressions. Heterochely was tested using the Mann-Whitney test. Only the relationships LCL vs CL for males and AL vs CL for females, were significantly different between adults and juveniles (P < 0.05); these were used to calculate morphological sexual maturity, estimated at 10.3mm CL for males and 8.1mm CL for females. Individuals did not present laterality (P > 0.05) or heterochely (P > 0.05). The average length of the largest and smallest cheliped in males was 9.9 ± 4.8 and 9.2 ± 4.26 mm, while for females it was 7.3 ± 2.4 and 6.8 ± 2.3 mm, respectively. The variation in size and developmental rate of structures suggests that the species follow a mate guarding reproductive strategy since males have well-developed chelipeds to be able to court and guard females during copulation., Durante la ontogenia, la asignación de energía puede diferir a lo largo del ciclo de vida de una especie, especialmente entre la fase juvenil y adulta. El presente estudio tuvo como objetivo describir el crecimiento relativo y los patrones de heteroquelia y lateralidad del camarón de agua dulce Macrobrachium brasiliense. Se midieron la longitud de: caparazón (CL), abdomen (AL), quelípodo izquierdo (LCL), quelípodo derecho (RCL) y ancho del abdomen (AW) de machos y hembras. Las diferencias en las relaciones morfométricas entre juveniles y adultos se estudiaron mediante análisis de covarianza (ANCOVA) y regresiones lineales. La heteroquelia se probó utilizando una prueba de Mann-Whitney. Solo la relación LCL vs CL para machos y AL vs CL para hembras fue significativamente diferente entre adultos y juveniles (P < 0.05), medidas usadas para calcular la madurez sexual morfológica, estimada en 10,3 mm CL para machos y 8,1 mm CL para hembras. Los individuos no presentaron lateralidad (P > 0,05) ni heteroquelia (P > 0,05). La longitud promedio del quelípodo mayor y menor en los machos fue de 9,9 ± 4,8 y 9,2 ± 4,26 mm, mientras que en las hembras fue de 7,3 ± 2,4 y 6,8 ± 2,3 mm, respectivamente. La variación en el tamaño y la tasa de desarrollo de las estructuras indica que la especie sigue una estrategia reproductiva de mate guarding, ya que los machos tienen quelípodos bien desarrollados con los que cortejan y protegen a las hembras durante la cópula.
- Published
- 2022
4. Population biology and relative growth of the crab Minuca mordax (Smith, 1870) (Crustacea, Decapoda, Ocypodidae) in the Igaraçu River, Parnaíba, state of Piauí, Brazil
- Author
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Alves Vieira dos Santos, Sidely Gil, Santos Filho, Luiz Gonzaga Alves dos, Fernandes Goés, Lissandra Corrêa, Góes, João Marcos de, Alves Vieira dos Santos, Sidely Gil, Santos Filho, Luiz Gonzaga Alves dos, Fernandes Goés, Lissandra Corrêa, and Góes, João Marcos de
- Abstract
This study aimed to investigate the population biology of Minuca mordax in the Igaraçu River, Parnaíba, analyzing frequency distribution in size classes, reproductive period, relative growth, morphological sexual maturity, sex ratio and heterochely. The crabs were manually collected, randomly, by two people for 1 hour, in the representative months of the dry season (September to November) and rainy (April to June). In laboratory the crabs were identified, separated according to sex and measured. A total of 610 samples were captured, with 453 males and 157 females. The average size of carapace width (CW) was significantly different (p < 0.05) between males (17.21 ± 3.68 mm) and females (15.06 ± 3.18 mm). The distribution of the crabs in size classes was unimodal for both sexes. The morphological sexual maturity obtained for males was 12.42 mm CW and females was 10.05 mm CW. The sex ratio for the population was 1:0.35 (male: female), with significant difference from the expected ratio of 1:1. The heterochely was observed only in males of the species (224 right-handed and 229 sinister). Subsequently, other on-site observations were carried out monthly, from February/2011 to January/2012 to observe ovigerous females and determine the reproductive period. Females with eggs were observed only from March to June, corresponding to the rainy season in the region. The results found in the present study are similar to those observed in other populations of violinist crabs and suggest that the population is stable in the environment. The present study provides subsidies for the conservation of the species in the Igaraçu River., O presente estudo teve como objetivo investigar a biologia populacional de Minuca mordax no Rio Igaraçu, Parnaíba, PI, analisando a distribuição de frequência em classes de tamanho, período reprodutivo, crescimento relativo, maturidade sexual morfológica, razão sexual e heteroquelia. Os animais foram coletados manualmente de forma aleatória por duas pessoas durante 1 hora, nos meses representativos da estação seca (setembro a novembro) e chuvosa (abril a junho). Em laboratório os caranguejos foram identificados, separados quanto ao sexo e mensurados. Um total de 610 exemplares foi capturado, sendo 453 machos e 157 fêmeas. O tamanho médio da largura de carapaça (LC) diferiu significativamente (p<0,05) entre machos (17,21 ± 3,68 mm) e fêmeas (15,06 ± 3,18 mm). A distribuição dos caranguejos em classes de tamanho foi unimodal para ambos os sexos. A maturidade sexual morfológica obtida para os machos foi de 12,42 mm de LC e para as fêmeas foi de 10,05 mm de LC. A razão sexual para a população foi de 1:0,35 (macho:fêmea), sendo verificada diferença significativa da proporção esperada de 1:1. A heteroquelia foi verificada apenas nos machos da espécie (224 destros e 229 sinistros). Posteriormente, outras observações in loco foram realizadas mensalmente, de fevereiro/2011 a janeiro/2012 para observação de fêmeas ovígeras e determinação do período reprodutivo. Fêmeas com ovos foram observadas apenas nos meses de março a junho, correspondendo ao período chuvoso da região. Os resultados encontrados no presente estudo são semelhantes aos observados em outras populações de caranguejos violinistas e sugerem que a população se encontra estável no ambiente. O presente estudo fornece subsídios para a conservação da espécie no manguezal do Rio Igaraçu.
- Published
- 2020
5. Taxonomy, reproductive morphology and relative growth in the ghost shrimp Callichirus major (Say, 1818) (Decapoda: Callianassidae), in southeast of Brazil
- Author
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Rio, Juliana Priscila Piva, Universidade Estadual Paulista (Unesp), Pinheiro, Marcelo Antonio Amaro, and Bové, Patricio Alejandro Hernáez
- Subjects
Atlântico Ocidental ,Crustacea ,morphological comparison ,Western Atlantic ,sexual system ,heteroquelia ,sistema sexual ,comparação morfológica ,heterochely - Abstract
Submitted by Juliana Priscila Piva Rio null (julianario.bio@gmail.com) on 2018-03-16T06:14:29Z No. of bitstreams: 1 TAXONOMIA MORFOLOGIA REPRODUTIVA E CRESCIMENTO RELATIVO NO CAMARÃO-FANTASMA CALLICHIRUS MAJOR NO SUDESTE DO BRASIL..pdf: 2710701 bytes, checksum: eefba261c01a8fd4d434dcbbcc8c0739 (MD5) Rejected by Disleide Silvia Valerio Gounella null (disleide@clp.unesp.br), reason: oi. on 2018-03-19T17:45:07Z (GMT) Submitted by Juliana Priscila Piva Rio null (julianario.bio@gmail.com) on 2018-03-19T18:24:24Z No. of bitstreams: 1 TAXONOMIA MORFOLOGIA REPRODUTIVA E CRESCIMENTO RELATIVO NO CAMARÃO-FANTASMA CALLICHIRUS MAJOR NO SUDESTE DO BRASIL..pdf: 2947931 bytes, checksum: 6fecf0ed8a7587f26c7ffa6fbff0c9e0 (MD5) Rejected by Disleide Silvia Valerio Gounella null (disleide@clp.unesp.br), reason: Boa tarde. Favor fazer as seguintes inclusões: - Palavras chaves em inglês; - Resumo em inglês; - Área de pesquisa abs. Disleide Silvia Valerio Gounella Bibliotecária CLP - São Vicente Fone: (13)3569-7154 Mailto: disleide@clp.unesp.br skype: disleidesilviavaleriogounella on 2018-03-19T18:56:04Z (GMT) Submitted by Juliana Priscila Piva Rio null (julianario.bio@gmail.com) on 2018-03-19T19:27:47Z No. of bitstreams: 1 TAXONOMIA MORFOLOGIA REPRODUTIVA E CRESCIMENTO RELATIVO NO CAMARÃO-FANTASMA CALLICHIRUS MAJOR NO SUDESTE DO BRASIL..pdf: 2947931 bytes, checksum: 6fecf0ed8a7587f26c7ffa6fbff0c9e0 (MD5) Rejected by Disleide Silvia Valerio Gounella null (disleide@clp.unesp.br), reason: Bom dia. Favor retificar a área de pesquisa, pois a informada não condiz com nenhuma área de pesquisa oferecida pelo CLP. abs. Disleide on 2018-03-20T12:40:01Z (GMT) Submitted by Juliana Priscila Piva Rio null (julianario.bio@gmail.com) on 2018-03-20T13:28:42Z No. of bitstreams: 1 TAXONOMIA MORFOLOGIA REPRODUTIVA E CRESCIMENTO RELATIVO NO CAMARÃO-FANTASMA CALLICHIRUS MAJOR NO SUDESTE DO BRASIL..pdf: 2947931 bytes, checksum: 6fecf0ed8a7587f26c7ffa6fbff0c9e0 (MD5) Approved for entry into archive by Disleide Silvia Valerio Gounella null (disleide@clp.unesp.br) on 2018-03-20T18:16:20Z (GMT) No. of bitstreams: 1 rio_jpp_me_svic_par.pdf: 710436 bytes, checksum: e7bc3efb3cb3edfe6639905d1d866e7a (MD5) Made available in DSpace on 2018-03-20T18:16:20Z (GMT). No. of bitstreams: 1 rio_jpp_me_svic_par.pdf: 710436 bytes, checksum: e7bc3efb3cb3edfe6639905d1d866e7a (MD5) Previous issue date: 2018-02-19 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) O presente estudo analisa a taxonomia, morfologia externa e interna do sistema reprodutivo e crescimento relativo do camarão-fantasma Callichirus major da costa do Brasil. Para isto, espécimes de C. major foram coletados ao longo de todo o litoral brasileiro e, de forma particular, mensalmente, durante um ano, na Praia do Gonzaga, região Sudeste do Brasil. Um total de 840 indivíduos (316 machos, 524 fêmeas) foram avaliados. Ocorrendo desde o estado do Pará até Santa Catarina, C. major apresentou um rostro com duas projeções anterolaterais triangulares, pedúnculos oculares com pontas obtusas, dáctilo do quelípodo maior dos machos com uma ponta bífida e margem interna lisa, projeção proximal do carpo com margem reta, mero com porção proximal da margem dorsal dentada, quelípodo menor com borda cortante dentada e um dente grande curvado para frente entre as projeções laterais do telso. Estes animais apresentaram diferenças morfológicas marcantes em comparação aos espécimes de C. major procedentes da Florida (EUA), justificando a separação da grande população do Atlântico Ocidental de C. major e determinando uma nova espécie no gênero, Callichirus brasiliensis sp. nov. Nos capítulos desta dissertação que não trataram de taxonomia, optamos por manter o nome da espécie até o momento aceito, C. major. A morfologia reprodutiva externa destes camarões-fantasma se mostrou distinta entre machos, com gonóporos circulares, localizados no quinto par de pereiópodos, e fêmeas, com gonóporos ovalados, sobre o terceiro par de pereiópodos, além de apresentarem uma abertura vestigial e circular, no quinto par de pereiópodos. As gônadas dos machos são tubulares apresentando uma seção anterior testicular e uma posterior ovariana, enquanto as fêmeas apresentaram dois ovários robustos e intensamente avermelhados na fase pós-puberal. Nenhum órgão interno das fêmeas se comunicou com o gonóporo extra na coxa do quinto pereiópodo, caracterizando essa estrutura como não funcional. O primeiro par de pleópodos é sexualmente dimórfico, sendo reduzido nos machos, composto por dois segmentos, enquanto que nas fêmeas é bem desenvolvido e se compõe por três artículos. Somente fêmeas apresentaram cerdas longas e finas sobre estes apêndices abdominais, durante o período reprodutivo. O segundo pleópodo é birreme em ambos os sexos, com um apêndice interno nas fêmeas e ausência do apêndice masculino nos machos. Por mais que os ovários dos machos produzam ovócitos, a ovoposição parece não ocorrer, sem provas de uma funcionalidade para a reprodução na espécie, assim como os gonóporos não funcionais presentes nas fêmeas (jovens e adultas). Todas as evidências morfológicas externas apontam para um dimorfismo entre os sexos em C. major, parecendo o hermafroditismo ser uma característica não funcional na espécie. A análise do crescimento relativo entre o primeiro par de pereiópodos (quelípodos) e o comprimento da carapaça, demonstrou uma alometria positiva nos juvenis de ambos os sexos, tanto para o comprimento quanto para a largura do carpo. O mesmo ocorreu quanto ao crescimento do comprimento do carpo nos machos adultos. As fêmeas adultas apresentaram uma alometria negativa para as duas relações, assim como os machos adultos, quanto a altura do carpo. O tamanho de maturidade foi síncrono entre os sexos da espécie, sendo estimado em 15 e 16 mm de comprimento de carapaça, para os machos e fêmeas, respectivamente. Além de ser confirmada hetero e homoquelia para ambos os sexos em C. major, com a heteroquelia predominante nos machos (86,9%), enquanto a maioria das fêmeas apresentaram homoquelia (59,3%). Comprovou-se que o comprimento e altura do carpo podem ser utilizados com eficiência para a obtenção do tamanho de maturidade sexual. Adicionalmente, os resultados demonstraram uma heteroquelia mais acentuada nos machos da espécie, existindo grande dimorfismo sexual quanto a morfologia e taxa de crescimento do primeiro par de pereiópodos, tanto nos indivíduos juvenis, quanto nos adultos. Levando em conta as evidências morfológicas (gonóporos, pleópodos 1 e pleópodos 2) de dimorfismo sexual, além da diferença nas taxas de crescimento e tipos quelares entre machos e fêmeas de C. major, os resultados aqui expostos corroboram a ideia de que a espécie apresenta sexos bem definidos, característica de um sistema sexual gonocórico. Também foram confirmadas características vestigiais de hermafroditismo (ovários nos machos e gonóporos extras nas fêmeas), portanto, não sendo funcionais nesta espécie. The present study analyses the taxonomy, external and internal morphology of the reproductive apparatus and relative growth of the ghost shrimp Callichirus major from the coast of Brazil. For this, specimens of C. major were collected along the entire Brazilian coast and, in particular, monthly, for one year, in Gonzaga’s Beach, Southeastern region of Brazil. A total of 840 individuals (316 males, 524 females) were evaluated. Occurring from the state of Pará to Santa Catarina, C. major presented a rostrum with two triangular anterolateral projections, ocular peduncles with obtuse tips, dactyl of the greater chelipod of males with a bifid tip and smooth internal margin, proximal projection of the carpal with straight margin, merus with proximal portion with dentate dorsal margin, smaller chelipod with toothed cutting edge and a large tooth curved forward between the lateral projections of the telson. These animals presented marked morphological differences when compared to specimens of C. major from Florida (USA), justifying the separation of the large Western Atlantic population from C. major and determining a new species in this genus – Callichirus brasiliensis n. sp. In the chapters of this thesis that don’t deal with taxonomy, we chose to keep the name of the species so far accepted, C. major. The external reproductive anatomy of these ghost shrimps was shown to be distinct between males, with circular gonopores located in the fifth pair of pereiopods, and females with oval gonopores on the third pair of pereiopods, in addition having a vestigial circular aperture in the fifth pair of pereiopods. The gonads of the males are tubular presenting an anterior testicular section and a posterior ovarian section, while the females presented two robust and intensely reddish ovaries in the post-pubertal phase. Internal organs of the females don’t communicate with the extra gonopore in the coxal of the fifth pereiopod, characterizing this structure as nonfunctional. In addition, the first pair of pleopods is sexually dimorphic, being reduced in males, composed of two segments, whereas in females it is well developed and is composed of three articles. Only females presented long and slender bristles on these abdominal appendages during the reproductive period. The second pleopod is birramus in both sexes, with an internal appendix in females and absence of the male appendix in males. Although the female gonads of the males produce oocytes, ovoposition doesn’t appear to occur, with no evidence of functionality for reproduction in the species, as well as nonfunctional gonopores present in females (juvenile and adult). All external morphological evidence points to a sexual dimorphism in C. major, and hermaphroditism seems to be a vestigial trait, probably ancestral in the genus Callichirus. The analysis of relative growth between the first pair of pereiopods (chelipods) and carapace length, demonstrated a positive allometry in juveniles of both sexes, for carpal 10 length and width. The same was true for carpal length growth in adult males. Adult females showed a negative allometry for both ratios, as well as adult males, regarding carpal height. The synchronous maturity size, between the sexes of the species, was estimated at 15 and 16 mm of carapace length, for males and females, respectively. In addition, was confirmed heterochely and homoquely for both sexes in C. major, with predominant heteroquely in males (86.9%), while most females presented homoquely (59.3%). It was verified that carpal length and height can be used for analyzes of relative growth, being efficient to obtain the size of sexual maturity. In addition, the results showed a more pronounced heterochely in males of the species, and there is great sexual dimorphism as to the morphology and growth rate of the first pair of pereiopods, in juveniles and adults. Taking into account the morphological evidence (gonopores, pleopods 1 and pleopods 2) of sexual dimorphism, besides the difference in the growth rates and chelar types between males and females of C. major, the results here presented corroborate the idea that the species has sex characteristics of a gonocoric sexual system. Also were registered vestigial hermaphrodite characteristics (ovaries in males and extra gonopores in females), therefore, they are nonfunctional in this species. CAPES: 1688290
- Published
- 2018
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