Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the Contas River, Bahia, Brazil
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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2020
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| author | Matheus Souza-Ferreira-de-Barros |
| author_facet | Matheus Souza-Ferreira-de-Barros |
| contents | Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the Contas River, Bahia, Brazil Matheus Souza-Ferreira-de-Barros Tereza-Cristina dos-Santos-Calado Ewerton Vieira-dos-Santos Alberis Santos-Silva Letícia Gomes-de-Andrade-Albuquerque Biología Ecology limnology freshwater morphometry conservation Introduction: Crustaceans have economic and ecological importance and the role of caridean crustaceans in lentic environments is crucial to maintain the trophic structure. The species Atya scabra is occasionally associated with fisheries, especially in Northeast and Northern Brazil. Objective: To determine the population structure, reproductive period, patterns of growth and distribution of size classes among sexes in a population of the prawn A. scabra in the De Contas River, Bahia, Brazil. Methods: Individuals were sampled in a period of one year by passing sieves through marginal vegetation and using dragnets. In the laboratory, we recorded the sex of the individuals and measured them using a pachymeter with 0.001 mm precision. The dimensions measured were CL (carapace length), TL (total length) and CW (carapace width). In order to analyze data, linear models for the relationships CL × CW were constructed and the type of allometry for each sex was determined. Individuals were grouped into size classes of 5 mm intervals. A chi-square test (χ2) was used to test deviation from the 1:1 sex ratio. The proportion of ovigerous females was registered for each month to determine the breeding period. Results: A total of 517 individuals were collected, 328 were males and 186 females of which 169 were ovigerous. Males showed a polymodal distribution in size classes and were significantly larger than females, which presented a unimodal distribution in size classes. The observed growth patterns demonstrated that both sexes present negative allometry. However, sexual dimorphism was detected when comparing the growth parameters. Ovigerous females were sampled the entire year and size-frequency data demonstrated that recruitment also occurs throughout the year, which allowed us to classify their reproduction as continuous. Conclusions: Our data is essential to draw sustainable fishery management strategies. We suggest a minimum capture size of 70 mm and capture restrictions from May to August. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44967847002 https://www.redalyc.org/journal/449/44967847002/ https://www.redalyc.org/journal/449/44967847002/html/ https://www.redalyc.org/journal/449/44967847002/44967847002.epub https://www.redalyc.org/journal/449/44967847002/movil DOI10.15517/RBT.V68I3.38596 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.3 Vol.68 |
| format | Artículo científico |
| id | redalyc_44967847002 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the Contas River, Bahia, Brazil Matheus Souza-Ferreira-de-Barros Biología Ecology limnology freshwater morphometry conservation Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the Contas River, Bahia, Brazil Matheus Souza-Ferreira-de-Barros Tereza-Cristina dos-Santos-Calado Ewerton Vieira-dos-Santos Alberis Santos-Silva Letícia Gomes-de-Andrade-Albuquerque Biología Ecology limnology freshwater morphometry conservation Introduction: Crustaceans have economic and ecological importance and the role of caridean crustaceans in lentic environments is crucial to maintain the trophic structure. The species Atya scabra is occasionally associated with fisheries, especially in Northeast and Northern Brazil. Objective: To determine the population structure, reproductive period, patterns of growth and distribution of size classes among sexes in a population of the prawn A. scabra in the De Contas River, Bahia, Brazil. Methods: Individuals were sampled in a period of one year by passing sieves through marginal vegetation and using dragnets. In the laboratory, we recorded the sex of the individuals and measured them using a pachymeter with 0.001 mm precision. The dimensions measured were CL (carapace length), TL (total length) and CW (carapace width). In order to analyze data, linear models for the relationships CL × CW were constructed and the type of allometry for each sex was determined. Individuals were grouped into size classes of 5 mm intervals. A chi-square test (χ2) was used to test deviation from the 1:1 sex ratio. The proportion of ovigerous females was registered for each month to determine the breeding period. Results: A total of 517 individuals were collected, 328 were males and 186 females of which 169 were ovigerous. Males showed a polymodal distribution in size classes and were significantly larger than females, which presented a unimodal distribution in size classes. The observed growth patterns demonstrated that both sexes present negative allometry. However, sexual dimorphism was detected when comparing the growth parameters. Ovigerous females were sampled the entire year and size-frequency data demonstrated that recruitment also occurs throughout the year, which allowed us to classify their reproduction as continuous. Conclusions: Our data is essential to draw sustainable fishery management strategies. We suggest a minimum capture size of 70 mm and capture restrictions from May to August. 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44967847002 https://www.redalyc.org/journal/449/44967847002/ https://www.redalyc.org/journal/449/44967847002/html/ https://www.redalyc.org/journal/449/44967847002/44967847002.epub https://www.redalyc.org/journal/449/44967847002/movil DOI10.15517/RBT.V68I3.38596 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.3 Vol.68 |
| title | Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the Contas River, Bahia, Brazil |
| topic | Biología Ecology limnology freshwater morphometry conservation |
| url | https://www.redalyc.org/articulo.oa?id=44967847002 https://www.redalyc.org/journal/449/44967847002/ https://www.redalyc.org/journal/449/44967847002/html/ https://www.redalyc.org/journal/449/44967847002/44967847002.epub https://www.redalyc.org/journal/449/44967847002/movil |