The imprint of anthropogenic CO2 emissions on Atlantic bluefin tuna otoliths

Otoliths of Atlantic bluefin tuna (Thunnus thynnus) collected from the Mediterranean Sea and North Atlantic Ocean were analyzed to evaluate changes in the seawater isotopic composition over time. We report an annual otolith δ13C record that documents the magnitude of the δ13C depletion in the Medite...

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Bibliographic Details
Published in:Journal of Marine Systems
Main Authors: Fraile, Igaratza, Arrizabalaga, Haritz, Groeneveld, Jeroen, Kölling, Martin, Santos, Miguel Neves, Macías, David, ADDIS, PIERANTONIO, Dettman, David L., Karakulak, Saadet, Deguara, Simeon, Rooker, Jay R.
Other Authors: Santos, Miguel Neve, Addis, Pierantonio
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
CO2 emission
Mediterranean Sea
Suess effect
δ13C and δ18O
Oceanography
Ecology
evolution
behavior and systematic
Aquatic science
North Atlantic
Online Access:http://hdl.handle.net/11584/181863
https://doi.org/10.1016/j.jmarsys.2015.12.012
Description
Summary:Otoliths of Atlantic bluefin tuna (Thunnus thynnus) collected from the Mediterranean Sea and North Atlantic Ocean were analyzed to evaluate changes in the seawater isotopic composition over time. We report an annual otolith δ13C record that documents the magnitude of the δ13C depletion in the Mediterranean Sea between 1989 and 2010. Atlantic bluefin tuna in our sample (n = 632) ranged from 1 to 22 years, and otolith material corresponding to the first year of life (back-calculated birth year) was used to reconstruct seawater isotopic composition. Otolith δ18O remained relatively stable between 1989 and 2010, whereas a statistically significant decrease in δ13C was detected across the time interval investigated, with a rate of decline of 0.05‰ yr-1 (-0.94‰ depletion throughout the recorded period). The depletion in otolith δ13C over time was associated with the oceanic uptake of anthropogenically derived CO2.

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