Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions

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 su...

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Autores principales:	Alonso, Felipe, Cánepa, Maximiliano Martín, Pandolfi, Matías
Publicado:	2011
Materias:	Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Perciformes
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v9_n3_p559_Alonso http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_16796225_v9_n3_p559_Alonso
record_format	dspace
spelling	paper:paper_16796225_v9_n3_p559_Alonso2023-06-08T16:26:33Z Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions Alonso, Felipe Cánepa, Maximiliano Martín Pandolfi, Matías Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Cichlidae Perciformes 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. Fil:Alonso, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cánepa, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pandolfi, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v9_n3_p559_Alonso http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Cichlidae Perciformes
spellingShingle	Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Cichlidae Perciformes Alonso, Felipe Cánepa, Maximiliano Martín Pandolfi, Matías Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
topic_facet	Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Cichlidae Perciformes
description	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.
author	Alonso, Felipe Cánepa, Maximiliano Martín Pandolfi, Matías
author_facet	Alonso, Felipe Cánepa, Maximiliano Martín Pandolfi, Matías
author_sort	Alonso, Felipe
title	Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_short	Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_full	Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_fullStr	Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_full_unstemmed	Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_sort	social and reproductive physiology and behavior of the neotropical cichlid fish cichlasoma dimerus under laboratory conditions
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v9_n3_p559_Alonso http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
work_keys_str_mv	AT alonsofelipe socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions AT canepamaximilianomartin socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions AT pandolfimatias socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions
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Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions

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