| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Seasonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern Atlantic Ocean
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| Autores: |
Sardenne, Fany
Diaha, N'Guessan Constance
Amande, Monin Justin
Zudaire, Iker
Couturier, Lydie
Metral, Luisa
Le Grand, Fabienne
Bodin, Nathalie
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| Data: |
2019-01
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| Ano: |
2019
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| 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 (>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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00436/54796/56254.pdf
DOI:10.1139/cjfas-2017-0368
https://archimer.ifremer.fr/doc/00436/54796/
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| Editor: |
Canadian Science Publishing, Nrc Research Press
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| Relação: |
info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE
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| Formato: |
application/pdf
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| 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
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| Direitos: |
2018, NRC Research Press or its licensors
info:eu-repo/semantics/openAccess
restricted use
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