| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation
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| Autores: |
Artetxe-arrate, Iraide
Fraile, Igaratza
Farley, Jessica
Darnaude, Audrey M.
Clear, Naomi
Rodríguez-ezpeleta, Naiara
Dettman, David L.
Pécheyran, Christophe
Krug, Iñigo
Médieu, Anais
Ahusan, Mohamed
Proctor, Craig
Priatna, Asep
Lestari, Pratiwi
Davies, Campbell
Marsac, Francis
Murua, Hilario
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| Data: |
2021-03
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| Ano: |
2021
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| Resumo: |
The chemical composition of otoliths (earbones) can provide valuable information about stock structure and connectivity patterns among marine fish. For that, chemical signatures must be sufficiently distinct to allow accurate classification of an unknown fish to their area of origin. Here we have examined the suitability of otolith microchemistry as a tool to better understand the spatial dynamics of skipjack tuna (Katsuwonus pelamis), a highly valuable commercial species for which uncertainties remain regarding its stock structure in the Indian Ocean. For this aim, we have compared the early life otolith chemical composition of young-of-the-year (<6 months) skipjack tuna captured from the three main nursery areas of the equatorial Indian Ocean (West, Central and East). Elemental (Li:Ca, Sr:Ca, Ba:Ca, Mg:Ca and Mn:Ca) and stable isotopic (δ13C, δ18O) signatures were used, from individuals captured in 2018 and 2019. Otolith Sr:Ca, Ba:Ca, Mg:Ca and δ18O significantly differed among fish from different nurseries, but, in general, the chemical signatures of the three nursery areas largely overlapped. Multivariate analyses of otolith chemical signatures revealed low geographic separation among Central and Eastern nurseries, achieving a maximum overall random forest cross validated classification success of 51%. Cohort effect on otolith trace element signatures was also detected, indicating that variations in chemical signatures associated with seasonal changes in oceanographic conditions must be well understood, particularly for species with several reproductive peaks throughout the year. Otolith microchemistry in conjunction with other techniques (e.g., genetics, particle tracking) should be further investigated to resolve skipjack stock structure, which will ultimately contribute to the sustainable management of this stock in the Indian Ocean.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00687/79908/82810.pdf
https://archimer.ifremer.fr/doc/00687/79908/82811.tif
https://archimer.ifremer.fr/doc/00687/79908/82812.tif
https://archimer.ifremer.fr/doc/00687/79908/82813.csv
DOI:10.1371/journal.pone.0249327
https://archimer.ifremer.fr/doc/00687/79908/
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| Editor: |
Public Library of Science (PLoS)
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| Formato: |
application/pdf
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| Fonte: |
Plos One (1932-6203) (Public Library of Science (PLoS)), 2021-03 , Vol. 16 , N. 3 , P. e0249327 (18p.)
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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