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Abstract:

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.

Registro:

Documento: Artículo
Título:Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)
Autor:Da Silva-Castiglioni, D.; Greco, L.L.; Oliveira, G.T.; Bond-Buckup, G.
Filiación:Department of Zoology, Federal University of Rio Grande Do sul, Avenida Bento Gonçalves, Porto Alegre, Rio Grande do Sul, Brazil
Department of Biodiversity and Experimental Biology, FCEyN, University of Buenos Aires, Buenos Aires, Argentina
Faculty of Bioscience, Department of Morphophysiology, Pontifical Catholic University of Rio Grande Do sul, Rio Grande do Sul, Brazil
Palabras clave:Crayfish; Hermaphroditism; Histology; Sexual pattern; Animalia; Astacoidea; Crustacea; Decapoda (Crustacea); Parastacidae; Parastacus
Año:2008
Volumen:127
Número:4
Página de inicio:426
Página de fin:432
DOI: http://dx.doi.org/10.1111/j.1744-7410.2008.00144.x
Título revista:Invertebrate Biology
Título revista abreviado:Invertebr. Biol.
ISSN:10778306
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10778306_v127_n4_p426_DaSilvaCastiglioni

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Citas:

---------- APA ----------
Da Silva-Castiglioni, D., Greco, L.L., Oliveira, G.T. & Bond-Buckup, G. (2008) . Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae). Invertebrate Biology, 127(4), 426-432.
http://dx.doi.org/10.1111/j.1744-7410.2008.00144.x
---------- CHICAGO ----------
Da Silva-Castiglioni, D., Greco, L.L., Oliveira, G.T., Bond-Buckup, G. "Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)" . Invertebrate Biology 127, no. 4 (2008) : 426-432.
http://dx.doi.org/10.1111/j.1744-7410.2008.00144.x
---------- MLA ----------
Da Silva-Castiglioni, D., Greco, L.L., Oliveira, G.T., Bond-Buckup, G. "Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)" . Invertebrate Biology, vol. 127, no. 4, 2008, pp. 426-432.
http://dx.doi.org/10.1111/j.1744-7410.2008.00144.x
---------- VANCOUVER ----------
Da Silva-Castiglioni, D., Greco, L.L., Oliveira, G.T., Bond-Buckup, G. Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae). Invertebr. Biol. 2008;127(4):426-432.
http://dx.doi.org/10.1111/j.1744-7410.2008.00144.x