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Abstract:

In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an opaque grey one. Black ventral coloration was associated with reproductive individuals. Courtship displays, which were similar to threatening displays, had the common effect of increasing the visible area of the individual. The dominant male was always the largest one suggesting that size is probably a major factor determining the hierarchy establishment and that these intra-sexually selected traits may have been reinforced by inter-sexual selection. Reproductive males had higher pituitary levels of β-follicle stimulating hormone (β-FSH) and somatolactin (SL) than non reproductive ones, while no differences were found among females. No differences were found among male gonadosomatic indexes. Non reproductive individuals had higher plasma cortisol levels for both sexes. It is possible that dominant reproductive individuals may be inhibiting reproduction of subordinate fish through physical contact, increasing their cortisol levels and diminishing FSH and SL pituitary content. However, this was not reflected as an inhibition at the gonadal level in our experimental design. © 2011 Sociedade Brasileira de Ictiologia.

Registro:

Documento: Artículo
Título:Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
Autor:Alonso, F.; Cánepa, M.; Moreira, R.G.; Pandolfi, M.
Filiación:Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Departamento de Fisiologia, Instituto de Biociências (USP), cidade Universitacute;ria, Rua do Matao, Travessa 14, 321, sala 220, 05508-900 São Paulo, SP, Brazil
Palabras clave:Cichlidae; Cortisol; Gonadosomatic index; Gonadotropins; Somatolactin; Cichlasoma; Cichlidae; Perciformes
Año:2011
Volumen:9
Número:3
Página de inicio:559
Página de fin:570
DOI: http://dx.doi.org/10.1590/S1679-62252011005000025
Título revista:Neotropical Ichthyology
Título revista abreviado:Neotrop. Ichthyol.
ISSN:16796225
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_16796225_v9_n3_p559_Alonso.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v9_n3_p559_Alonso

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Citas:

---------- APA ----------
Alonso, F., Cánepa, M., Moreira, R.G. & Pandolfi, M. (2011) . Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions. Neotropical Ichthyology, 9(3), 559-570.
http://dx.doi.org/10.1590/S1679-62252011005000025
---------- CHICAGO ----------
Alonso, F., Cánepa, M., Moreira, R.G., Pandolfi, M. "Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions" . Neotropical Ichthyology 9, no. 3 (2011) : 559-570.
http://dx.doi.org/10.1590/S1679-62252011005000025
---------- MLA ----------
Alonso, F., Cánepa, M., Moreira, R.G., Pandolfi, M. "Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions" . Neotropical Ichthyology, vol. 9, no. 3, 2011, pp. 559-570.
http://dx.doi.org/10.1590/S1679-62252011005000025
---------- VANCOUVER ----------
Alonso, F., Cánepa, M., Moreira, R.G., Pandolfi, M. Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions. Neotrop. Ichthyol. 2011;9(3):559-570.
http://dx.doi.org/10.1590/S1679-62252011005000025