Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river

ABSTRACT Despite the increase of exotic species in bodies of water, studies on the population structure of coexisting native and exotic fish species are rare. We evaluated the population structure of the native Poecilia mexicana and non-native Poeciliopsis gracilis species in an environmental gradie...

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Autores principales:	Bermúdez-González,María Pamela, Ramírez-García,Arely, Velázquez-García,Estefanía del Carmen, Queijeiro-Bolaños,Mónica Elisa, Ramírez-Herrejón,Juan Pablo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2020
Materias:	Poeciliidae population ecology habitat condition non-native fish sub-tropical river environ-mental gradient
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000300357
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spelling	oai:scielo:S0718-560X20200003003572020-07-23Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical riverBermúdez-González,María PamelaRamírez-García,ArelyVelázquez-García,Estefanía del CarmenQueijeiro-Bolaños,Mónica ElisaRamírez-Herrejón,Juan Pablo Poeciliidae population ecology habitat condition non-native fish sub-tropical river environ-mental gradient ABSTRACT Despite the increase of exotic species in bodies of water, studies on the population structure of coexisting native and exotic fish species are rare. We evaluated the population structure of the native Poecilia mexicana and non-native Poeciliopsis gracilis species in an environmental gradient and its relation to the habitat characteristics in the Jalpan River, located in the state of Queretaro, Mexico. We calculated size structure, sex ratio, gonad stage, and condition factor for both species. Visual-based habitat quality, riparian quality, and physical and chemical characteristics of water were also evaluated. A total of 322 individuals of P. gracilis and 762 of P. mexicana were captured with different fishing nets due to the habitat heterogeneity. Study sites were classified into three categories of habitat conditions: poor, marginal, and sub-optimal. P. mexicana females showed a complete structure of sizes in the poor habitat category. P. gracilis did not show a complete structure in any habitat category. The sub-optimal category of habitat conditions had the lowest number of specimens for both species. Poor category showed a sex ratio of 1:1 (females: males) for P. mexicana while in P. gracilis, females were more abundant than males (sex ratio 5:1). Fulton's factor was higher for P. mexicana than for P. gracilis. Our results showed that habitat quality of the river affected size structure, stages of development, and sex ratio of the two species, but did not show conclusive evidence of favored species or reproductive competition.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.48 n.3 20202020-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000300357en10.3856/vol48-issue3-fulltext-2423
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Poeciliidae population ecology habitat condition non-native fish sub-tropical river environ-mental gradient
spellingShingle	Poeciliidae population ecology habitat condition non-native fish sub-tropical river environ-mental gradient Bermúdez-González,María Pamela Ramírez-García,Arely Velázquez-García,Estefanía del Carmen Queijeiro-Bolaños,Mónica Elisa Ramírez-Herrejón,Juan Pablo Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
description	ABSTRACT Despite the increase of exotic species in bodies of water, studies on the population structure of coexisting native and exotic fish species are rare. We evaluated the population structure of the native Poecilia mexicana and non-native Poeciliopsis gracilis species in an environmental gradient and its relation to the habitat characteristics in the Jalpan River, located in the state of Queretaro, Mexico. We calculated size structure, sex ratio, gonad stage, and condition factor for both species. Visual-based habitat quality, riparian quality, and physical and chemical characteristics of water were also evaluated. A total of 322 individuals of P. gracilis and 762 of P. mexicana were captured with different fishing nets due to the habitat heterogeneity. Study sites were classified into three categories of habitat conditions: poor, marginal, and sub-optimal. P. mexicana females showed a complete structure of sizes in the poor habitat category. P. gracilis did not show a complete structure in any habitat category. The sub-optimal category of habitat conditions had the lowest number of specimens for both species. Poor category showed a sex ratio of 1:1 (females: males) for P. mexicana while in P. gracilis, females were more abundant than males (sex ratio 5:1). Fulton's factor was higher for P. mexicana than for P. gracilis. Our results showed that habitat quality of the river affected size structure, stages of development, and sex ratio of the two species, but did not show conclusive evidence of favored species or reproductive competition.
author	Bermúdez-González,María Pamela Ramírez-García,Arely Velázquez-García,Estefanía del Carmen Queijeiro-Bolaños,Mónica Elisa Ramírez-Herrejón,Juan Pablo
author_facet	Bermúdez-González,María Pamela Ramírez-García,Arely Velázquez-García,Estefanía del Carmen Queijeiro-Bolaños,Mónica Elisa Ramírez-Herrejón,Juan Pablo
author_sort	Bermúdez-González,María Pamela
title	Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
title_short	Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
title_full	Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
title_fullStr	Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
title_full_unstemmed	Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river
title_sort	population structure of poecilia mexicana (native) and poeciliopsis gracilis (non-native) in a subtropical river
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000300357
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Population structure of Poecilia mexicana (native) and Poeciliopsis gracilis (non-native) in a subtropical river

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