The foraging ecology of coastal bottlenose dolphins based on stable isotope mixing models and behavioural sampling
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- 作者：Jeremy J. Kiszka (1)
Paula Méndez-Fernandez (2)
Michael R. Heithaus (1)
Vincent Ridoux (2) - 刊名：Marine Biology
- 出版年：2014
- 出版时间：April 2014
- 年：2014
- 卷：161
- 期：4
- 页码：953-961
- 全文大小：566 KB
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Paula Méndez-Fernandez (2)
Michael R. Heithaus (1)
Vincent Ridoux (2)
1. Marine Sciences Program, Department of Biological Sciences, Florida International University, 3000 NE 151 St., North Miami, FL, 33181, USA
2. Institut du Littoral et de l’Environnement, LIENSs (Littoral, Environnement et Sociétés), UMR 7266, CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17000, La Rochelle, France - ISSN：1432-1793
文摘
Understanding trophic interactions is critical for elucidating ecological roles of marine predators. We used behavioural observations and stable isotope mixing models to investigate the feeding ecology of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in the lagoon of Mayotte (East Africa). We identified prey during 77?% of 54 observed feeding events, observed in both rainy (61?% of events) and dry (39?%) seasons. Caranx melampygus and Gnathanodon speciosus were involved in 67?% of these events, with Tylosurus crocodilus (20?%) and Mugil cephalus (13?%) also consumed. Mixing models, based on δ13C and δ15N values of skin and blubber (n?=?30 samples for both tissues), suggest that behavioural observations are representative of general feeding patterns. Indeed, C. melampygus and T. crocodilus (G. speciosus could not be included in models) were estimated to contribute most to dolphin diets, with mean estimated contributions of 44.6?% (±18.9) and 48.1?% (±19.1) for skin and 73.7?% (±14.9) and 16.9?% (±12.4) for blubber, respectively. Our results highlight the value of two independent methods (stable isotopes and behavioural observations) to assess prey preferences of free-ranging dolphins.