Data/hora: 09/06/2024 11:47:10

Provedor de dados: | 49
País: | Brazil
Título: | Trophic niche comparison between two predators in northern Rio de Janeiro State, Brazil: a stable isotopes approach
Autores: | Beneditto,Ana Paula Madeira Di; Rezende,Carlos Eduardo; Camargo,Plínio Barbosa; Kehrig,Helena Amaral.
Data: | 2013-09-01
Ano: | 2013
Palavras-chave: | Trophic niche; Marine vertebrates; Stable isotopes; Rio de Janeiro; Southwest Atlantic.
Resumo: | The trophic niche of the sympatric predators Pontoporia blainvillei(franciscana dolphin) and Trichiurus lepturus (ribbonfish) was compared by stable isotope (δ15N and δ13C) ratios in hepatic and muscular tissues to understand how they co-exist in the northern Rio de Janeiro State (21°30′S-22°15′S), south-eastern Brazil. Dolphin specimens were incidentally captured through commercial gillnet fisheries, while fish specimens were the target of these fisheries. The predators had similar δ15N values in the liver (P. blainvillei: 14.6 ± 1.0‰; T. lepturus: 14.4 ± 0.6‰), which indicates similar trophic position in the recent food intake. However,P. blainvillei showed lighter δ15N values in muscle (13.8 ± 1.0‰) than T. lepturus (15.0 ± 0.4‰), revealing differences in the long term diet that could be related with the prey size ingested. The δ13C signatures showed a preferential inshore and benthic food chain for P. blainvillei (liver: −15.2 ± 0.6‰; muscle: −16.0 ± 0.5‰) and a more offshore and pelagic food chain for T. lepturus(liver: −17.2 ± 0.6‰; muscle: −16.8 ± 0.3‰). The isotopic variances of liver and muscle revealed a broader niche width to P. blainvillei in relation to T. lepturus, with a greater use of available food resources in coastal waters. In the area of study, the differences in habitat use and exploitation of food resources are favoring the predators' coexistence.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300029
Editor: | Instituto Virtual da Biodiversidade | BIOTA - FAPESP
Relação: | 10.1590/S1676-06032013000300002
Formato: | text/html
Fonte: | Biota Neotropica  v.13 n.3 2013
Fonte: | info:eu-repo/semantics/openAccess