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Ontogenetic niche feeding partitioning in juvenile of white sea catfish Genidens barbus in estuarine environments, southern Brazil

Published online by Cambridge University Press:  01 August 2008

Manuel Mendoza-Carranza  and
João Paes Vieira
Manuel Mendoza-Carranza*
Affiliation:
El Colegio de la Frontera Sur—ECOSUR, Sistemas de Producción Alternativos, Pesquerías Artesanales Apartado Postal 1042, Admon. de Correos Tabasco, 2000, Calle Planetario Sin Número Esquina Con Circuito 86031, Villahermosa, Tabasco, México
João Paes Vieira
Affiliation:
Laboratório de Ictiologia, Departamento de Oceanografia, Fundação Universidade Federal do Rio Grande, Avenida Itália Km 8, Caixa Postal 474, Rio Grande—RS—Brazil
*
Correspondence should be addressed to: Manuel Mendoza-Carranza, El Colegio de la Frontera Sur—ECOSUR, Sistemas de Producción Alternativos, Pesquerías Artesanales Apartado Postal 1042, Admon. de Correos, Tabasco 2000, Calle Planetario Sin Número Esquina Con Circuito 86031, Villahermosa, Tabasco, México email: [email protected]
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Abstract

Ontogenetic diet changes (prey species richness and size) in juveniles of white sea catfish (Genidens barbus) were tested in three southern Brazilian estuaries: Mampituba (29°12′S), Tramandaí (30°02′S), Chuí (33°44′S). Cluster analysis revealed that white sea catfish juvenile populations in the three estuaries are composed of two feeding groups. These two feeding groups are coincident with a bimodal size–age distribution of the juveniles of white sea catfish. In small catfish (5 to 10 cm TL) copepods were the most numerous prey (Chuí = 86.66%N, Tramandaí = 85.52%N and Mampituba = 52.34%N). In large catfish (10 to 20 cm TL) the most abundant and frequent prey was fish (Chuí: 73.19%N and 74.56%FO; Tramandaí: 85.92%N and 73.33%FO; Mampituba: 52.34%N and 61.54%FO). The Morisita overlap index among small and large fish was low in all estuaries; high values of Morisita's similarity index were observed among same size catfish groups. In all cases, no differences were observed among prey bio-volume curves of same size predator groups (small, F = 0.41, P = 0.65; large, F = 2.19, P = 0.11). In all estuaries, prey size increased significantly with increasing predator size. The 90th regression quantile estimated with most precision the predator–prey size relationship.

Keywords

trophic ecologydiet overlapprey sizepredator–prey relationship
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 4 , June 2009 , pp. 839 - 848
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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