Otolith-temperature estimates in Atlantic bluefin tuna (Thunnus thynnus) from the Mediterranean Sea: Insights from clumped isotope measurements.

Autor: Artetxe-Arrate I; AZTI, Marine Research, AZTI Basque Research and Alliance, Txatxarramendi ugartea z/g, 48395, Sukarrieta, Bizkaia, Spain. Electronic address: iraide.artetxe@azti.es., Brophy D; Marine and Freshwater Research Centre, Atlantic Technological University - Galway City, Wellpark Road, Galway, H91 DY9Y, Ireland., Dettman DL; Environmental Isotope Laboratory, Department of Geosciences, University of Arizona, Tucson, AZ, 85721, USA., Lastra-Luque P; AZTI, Marine Research, AZTI Basque Research and Alliance, Txatxarramendi ugartea z/g, 48395, Sukarrieta, Bizkaia, Spain., Varela JL; Departamento de Biología, Universidad de Cádiz, Campus de Excelencia Internacional del Mar (CEI·MAR), Av. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain., Oray I; Istanbul University, Faculty of Aquatic Sciences, Vezneciler, Istanbul, Turkey., Arrizabalaga H; AZTI, Marine Research, AZTI Basque Research and Alliance, Txatxarramendi ugartea z/g, 48395, Sukarrieta, Bizkaia, Spain., Fraile I; AZTI, Marine Research, AZTI Basque Research and Alliance, Txatxarramendi ugartea z/g, 48395, Sukarrieta, Bizkaia, Spain.
Jazyk: angličtina
Zdroj: Marine environmental research [Mar Environ Res] 2024 Jan; Vol. 193, pp. 106283. Date of Electronic Publication: 2023 Nov 23.
DOI: 10.1016/j.marenvres.2023.106283
Abstrakt: The subpopulation and/or contingent structure of Atlantic bluefin tuna (Thunnus thynnus) within the Mediterranean Sea is undefined, leading to uncertainty regarding the best strategy for an effective assessment and management of this highly exploited stock. This study aimed to reconstruct temperatures experienced by Atlantic bluefin tuna during the early life period (<3.5 months) using clumped isotope temperature proxy, an innovative geothermometer for carbonates, that does not require previous knowledge of other environmental parameters such as water oxygen composition. We examined otolith chemistry in fish captured from 3 different areas of the Mediterranean Sea and adjacent waters. We found that mean seasonal temperature estimates from clumped isotopes did not differ significantly from satellite derived and otolith oxygen stable isotopic ratios derived temperatures, except for the central Mediterranean Sea, were clumped isotopes derived temperatures were significantly higher than satellite derived temperatures. However, the sensitivity of the clumped isotope thermometer was found to be lower than that based on oxygen fractionation equation, with high variance observed in the clumped isotopes derived temperature estimates. We also observed that clumped isotope derived temperatures were undistinguishable among bluefin tuna captured in the Gibraltar Strait, the central, and eastern Mediterranean Sea. In this paper, we discuss the major sources of uncertainty in temperature reconstructions using bluefin tuna otoliths.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Iraide Artetxe-Arrate reports financial support was provided by International Commission for the Conservation of Atlantic Tunas.
(Copyright © 2023. Published by Elsevier Ltd.)
Databáze: MEDLINE
Externí odkaz: