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Provedor de dados:  ArchiMer
País:  France
Título:  Manta birostris, predator of the deep? Insight into the diet of the giant manta ray through stable isotope analysis
Autores:  Burgess, Katherine B.
Couturier, Lydie I. E.
Marshall, Andrea D.
Richardson, Anthony J.
Weeks, Scarla J.
Bennett, Michael B.
Data:  2016-11
Ano:  2016
Palavras-chave:  Diet
Eastern tropical Pacific Ocean
Trophic ecology
Resumo:  The characterization of diet for the giant manta ray Manta birostris has been problematic given their large-scale movement patterns and the difficulty in obtaining stomach contents from this species. The large majority of existing information is based on observational data limited to feeding events at the sea surface during daylight. Recently discovered aggregation sites for the giant manta ray off mainland Ecuador are some of the most accessible to date and provide a unique opportunity for researchers to gather much needed information on this elusive species. To assess how important surface zooplankton is to giant manta ray diet, we conducted stable isotope analysis (N-15 and C-13) on M. birostris muscle and surface zooplankton. Trophic position estimates placed M. birostris overall at a secondary consumer level of approximately 3.4 but there was large variation in delta N-15 and delta C-13 values among individuals. Manta birostris muscle tissue delta C-13 values were also not consistent with this species feeding predominantly on surface zooplankton and suggest that the majority of dietary intake is of mesopelagic origin. Given the conservative life history and fisheries pressure on large planktivores, knowledge of their trophic role and foraging strategies is essential to better understand their ecology and develop effective conservation measures.
Tipo:  Text
Idioma:  Inglês

Editor:  Royal Soc
Formato:  application/pdf
Fonte:  Royal Society Open Science (2054-5703) (Royal Soc), 2016-11 , Vol. 3 , N. 11 , P. 160717 (1-10)
Direitos:  2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.


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