期刊
JOURNAL OF FISH BIOLOGY
卷 99, 期 5, 页码 1576-1590出版社
WILEY
DOI: 10.1111/jfb.14863
关键词
stable isotope; stomach content; trophic ecology; tuna; Western equatorial Atlantic
资金
- Ministry of Higher Education and Research
- Ministry of Foreign Affairs
- Ministry of Education, Brazil
- Coordination for the Improvement of Higher Education Personnel
- National Council for Scientific and Technological Development
- Ministry of Agriculture
The study analyzed the feeding habits and trophic interactions of four oceanic predatory fish around the Fernando de Noronha Archipelago in Brazil, revealing diverse diets and specialized feeding strategies to avoid competition among species.
The objective of this study was to analyse the feeding habits and trophic interactions between four oceanic predatory fish around the Fernando de Noronha Archipelago (FNA), Brazil, in the western equatorial Atlantic (3.86 degrees S/32.42 degrees W), internationally recognized as an environment of high economic and ecological value. For this purpose, biological samples of yellowfin tuna (Thunnus albacares), wahoo (Acanthocybium solandri), barracuda (Sphyraena barracuda) and dolphinfish (Coryphaena hippurus) were collected for stomach content and stable isotope analysis. Values of the index of relative importance revealed varied diets, with a strong presence of teleost fishes (Diodontidae and Exocoetidae) for all species, with yellowfin tuna having a greater diversity of food items. Despite being generalists/opportunists, the feeding strategy of these predators showed a tendency towards a specialized diet in the use of the available resources around the FNA. They presented a narrow trophic niche width (Levin's index, Bi < 0.6) and low overlap between species, except between barracuda and wahoo (MacArthur and Levin's, R-0 = 0.72). Isotopic compositions had broad values of delta C-13 and delta N-15, and were significantly different between species. Our results provide information about the four species' trophic organization and suggest that the predators avoid competition by preying on different prey, thus allowing their coexistence.
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