Data/hora: 12/06/2024 05:50:49

Provedor de dados: | 5
País: | France
Título: | Seasonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern Atlantic Ocean
Autores: | Sardenne, Fany; Diaha, N'Guessan Constance; Amande, Monin Justin; Zudaire, Iker; Couturier, Lydie; Metral, Luisa; Le Grand, Fabienne; Bodin, Nathalie.
Data: | 2019-01
Ano: | 2019
Resumo: | In the Gulf of Guinea, bigeye Thunnus obesus (BET) and yellowfin tuna Thunnus albacares (YFT) are important for commercial fisheries and play a prominent ecological role as top predators. Using fatty acid profiles and carbon and nitrogen stable isotopes we examined their niche partitioning in this understudied region. Niche overlap was high (&gt;70%), similar to percentages in other ocean basins. BET occupied a higher trophic position than YFT and fed on deeper prey (high δ15N values and high proportions of mono-unsaturated fatty acids). The trophic position of YFT decreased slightly in the last 15 years (δ15N values decrease ~0.5 ‰) suggesting a change in epipelagic communities, as observed in the eastern Pacific Ocean. Ontogenic changes were limited to BET. For both species, the dietary proportion of the diatoms marker (20:5n-3) increased in the seasonal upwelling area, highlighting the seasonal habitat influence on tunas diet. The relatively lipid-rich muscle (~6 % dry weight) of Atlantic tropical tunas suggested a richer diet in this region than for Indian Ocean tropical tunas and/or differences in energy allocation strategies.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00436/54796/56254.pdf

DOI:10.1139/cjfas-2017-0368

https://archimer.ifremer.fr/doc/00436/54796/

Editor: | Canadian Science Publishing, Nrc Research Press
Relação: | info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE
Formato: | application/pdf
Fonte: | Canadian Journal Of Fisheries And Aquatic Sciences (0706-652X) (Canadian Science Publishing, Nrc Research Press), 2019-01 , Vol. 76 , N. 1 , P. 69-80

Fonte:

2018, NRC Research Press or its licensors

info:eu-repo/semantics/openAccess

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