Data/hora: 13/06/2024 05:14:20

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Validation of otolith δ18O values as effective natural tags for shelf-scale geolocation of migrating fish	
Autores: 	Darnaude, Audrey M.; Hunter, Ewan.	
Data: 	2018-06	
Ano: 	2018	
Palavras-chave: 	Fish migration; Oxygen; Stable isotopes; Natural tag; Site fidelity; Plaice; Pleuronectes platessa.	
Resumo: 	The oxygen isotopic ratio of fish otoliths is increasingly used as a 'natural tag' to assess provenance in migratory species, with the assumption that variations in delta O-18 values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the spatial dynamics of North Sea plaice Pleuronectes platessa L., to examine the limits of otolith delta O-18-based geolocation of fish during their annual migrations. Detailed intra-annual otolith delta O-18 measurements for 1997-1999 from individuals of 3 distinct sub-stocks with different spawning locations were compared with delta O-18 values predicted at the monthly, seasonal and annual scales, using predicted sub-stock specific temperatures and salinities over the same years. Spatio-temporal variation in expected delta O-18 values (-0.23 to 2.94%) mainly reflected variation in temperature, and among-zone discrimination potential using otolith delta O-18 varied greatly by temporal scale and by time of year. Measured otolith delta O-18 values (-0.71 to 3.09%) largely mirrored seasonally predicted values, but occasionally fell outside expected delta O-18 ranges. Where mismatches were observed, differences among sub-stocks were consistently greater than predicted, suggesting that in plaice, differential sub-stock growth rates and physiological effects during oxygen fractionation enhance geolocation potential using otolith delta O-18. Comparing intra-annual delta O-18 values over several consecutive years for individuals with contrasted migratory patterns corroborated a high degree of feeding and spawning site fidelity irrespective of the sub-stock. Informed interpretation of otolith delta O-18 values can therefore provide relatively detailed fisheries-relevant data not readily obtained by conventional means.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00626/73782/75084.pdf

DOI:10.3354/meps12302

https://archimer.ifremer.fr/doc/00626/73782/	
Editor: 	Inter-research	
Formato: 	application/pdf	
Fonte: 	Marine Ecology Progress Series (0171-8630) (Inter-research), 2018-06 , Vol. 598 , P. 167-185	
Fonte: 	info:eu-repo/semantics/openAccess

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