Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)

Freshwater crayfishes of the genus Parastacus are intersex, i.e., show characteristics of both sexes in the same individual; also, intersexuality has been documented in hermaphroditic species. The aim of this study was to analyze the gonads of Parastacus varicosus, characterizing its sexual pattern....

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Autores principales: Da Silva-Castiglioni, D., Greco, L.L., Oliveira, G.T., Bond-Buckup, G.
Formato: JOUR
Materias:
Crayfish
Hermaphroditism
Histology
Sexual pattern
Animalia
Astacoidea
Crustacea
Decapoda (Crustacea)
Parastacidae
Parastacus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10778306_v127_n4_p426_DaSilvaCastiglioni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10778306_v127_n4_p426_DaSilvaCastiglioni
record_format dspace
spelling todo:paper_10778306_v127_n4_p426_DaSilvaCastiglioni2023-10-03T16:03:33Z Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae) Da Silva-Castiglioni, D. Greco, L.L. Oliveira, G.T. Bond-Buckup, G. Crayfish Hermaphroditism Histology Sexual pattern Animalia Astacoidea Crustacea Decapoda (Crustacea) Parastacidae Parastacus Freshwater crayfishes of the genus Parastacus are intersex, i.e., show characteristics of both sexes in the same individual; also, intersexuality has been documented in hermaphroditic species. The aim of this study was to analyze the gonads of Parastacus varicosus, characterizing its sexual pattern. The animals were collected at Cova do Touro, Gravataí, Rio Grande do Sul, Brazil. Three sexual forms were identified: intersex females, intersex males, and transitional specimens showing an ovotestes gonad that could only be identified by means of histological analysis. All specimens had two pairs of gonopores and gonoducts. The oviduct had a wider diameter in females, whereas in males the vasa deferentia were more developed. Gonads were composed of two parallel structures located in the cephalothorax. Female gonads were classified into three stages. The presence of transitional specimens may indicate that sex change occurs, with protandric hermaphroditism, as observed in other species of Parastacus. Because previous studies had demonstrated that P. varicosus is a gonochoristic species in a population from Uruguay, the present study addressed the possibility that the sexual pattern depends on differences in environmental factors among populations. To improve understanding of evolution of hermaphroditism in these crustaceans, their reproductive dynamics should be studied, including identification of the factors stimulating male and female functions. © 2008, The American Microscopical Society, Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10778306_v127_n4_p426_DaSilvaCastiglioni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Crayfish
Hermaphroditism
Histology
Sexual pattern
Animalia
Astacoidea
Crustacea
Decapoda (Crustacea)
Parastacidae
Parastacus
spellingShingle Crayfish
Hermaphroditism
Histology
Sexual pattern
Animalia
Astacoidea
Crustacea
Decapoda (Crustacea)
Parastacidae
Parastacus
Da Silva-Castiglioni, D.
Greco, L.L.
Oliveira, G.T.
Bond-Buckup, G.
Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
topic_facet Crayfish
Hermaphroditism
Histology
Sexual pattern
Animalia
Astacoidea
Crustacea
Decapoda (Crustacea)
Parastacidae
Parastacus
description Freshwater crayfishes of the genus Parastacus are intersex, i.e., show characteristics of both sexes in the same individual; also, intersexuality has been documented in hermaphroditic species. The aim of this study was to analyze the gonads of Parastacus varicosus, characterizing its sexual pattern. The animals were collected at Cova do Touro, Gravataí, Rio Grande do Sul, Brazil. Three sexual forms were identified: intersex females, intersex males, and transitional specimens showing an ovotestes gonad that could only be identified by means of histological analysis. All specimens had two pairs of gonopores and gonoducts. The oviduct had a wider diameter in females, whereas in males the vasa deferentia were more developed. Gonads were composed of two parallel structures located in the cephalothorax. Female gonads were classified into three stages. The presence of transitional specimens may indicate that sex change occurs, with protandric hermaphroditism, as observed in other species of Parastacus. Because previous studies had demonstrated that P. varicosus is a gonochoristic species in a population from Uruguay, the present study addressed the possibility that the sexual pattern depends on differences in environmental factors among populations. To improve understanding of evolution of hermaphroditism in these crustaceans, their reproductive dynamics should be studied, including identification of the factors stimulating male and female functions. © 2008, The American Microscopical Society, Inc.
format JOUR
author Da Silva-Castiglioni, D.
Greco, L.L.
Oliveira, G.T.
Bond-Buckup, G.
author_facet Da Silva-Castiglioni, D.
Greco, L.L.
Oliveira, G.T.
Bond-Buckup, G.
author_sort Da Silva-Castiglioni, D.
title Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
title_short Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
title_full Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
title_fullStr Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
title_full_unstemmed Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
title_sort characterization of the sexual pattern of parastacus varicosus (crustacea: decapoda: parastacidae)
url http://hdl.handle.net/20.500.12110/paper_10778306_v127_n4_p426_DaSilvaCastiglioni
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AT oliveiragt characterizationofthesexualpatternofparastacusvaricosuscrustaceadecapodaparastacidae
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