Ontogenetic niche feeding partitioning in juvenile of white sea catfish Genidens barbus in estuarine environments, southern Brazil
作者： Manuel Mendoza-Carranza , João Paes Vieira
DOI: 10.1017/S0025315408002403
关键词:
摘要: Ontogenetic diet changes (prey species richness and size) in juveniles of white sea catfish (Genidens barbus) were tested three southern Brazilian estuaries: Mampituba (29°12′S), Tramandai (30°02′S), Chui (33°44′S). Cluster analysis revealed that juvenile populations the estuaries are composed two feeding groups. These groups coincident with a bimodal size–age distribution catfish. In small (5 to 10 cm TL) copepods most numerous prey (Chui = 86.66%N, Tramandai = 85.52%N Mampituba = 52.34%N). large (10 20 cm TL) abundant frequent was fish (Chui: 73.19%N 74.56%FO; Tramandai: 85.92%N 73.33%FO; Mampituba: 52.34%N 61.54%FO). The Morisita overlap index among low all estuaries; high values Morisita's similarity observed same size cases, no differences bio-volume curves predator (small, F = 0.41, P = 0.65; large, F = 2.19, P = 0.11). estuaries, increased significantly increasing size. 90th regression quantile estimated precision predator–prey relationship.
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