Growth at the edge of the niche: An experimental study of the harmful alga Prymnesium parvum

Stable carbon (d super(13)C) and oxygen (d super(18)O) in the otolith cores of Atlantic bluefin tuna (Thunnus thynnus) vary temporally, with changes that quantitatively follow interdecadal variation in atmospheric and oceanic reservoirs. Both carbon and oxygen isotopic signatures vary significantly...

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Bibliographic Details
Published in:Limnology and oceanography 2009-01, Vol.54 (5), p.1665-1668
Main Authors: Schloesser, Ryan W, Rooker, Jay R, Louchuoarn, Patrick, Neilson, John D, Secor, David H
Format: Article
Language:English
Subjects:
Marine
Prymnesium parvum
Thunnus thynnus
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Summary:Stable carbon (d super(13)C) and oxygen (d super(18)O) in the otolith cores of Atlantic bluefin tuna (Thunnus thynnus) vary temporally, with changes that quantitatively follow interdecadal variation in atmospheric and oceanic reservoirs. Both carbon and oxygen isotopic signatures vary significantly by year of birth over the range investigated (1947-2006), with d super(13)C decreasing and d super(18)O increasing (-2.56 x 10 super(-2)ppt and 4.3 x 10 super(-3)ppt yr super(-1), respectively). The rate of change in otolith d super(13)C was similar to reported rates of atmospheric d super(13)C depletion, attributed to deforestation and the burning of fossil fuels (referred to as the Suess effect), suggesting a close link between atmospheric and oceanic carbon pools. Increases in otolith d super(18)O were evident but less pronounced, with observed variation possibly attributable to changing salinity in the Atlantic Ocean. Otolith cores of bluefin tuna effectively track interdecadal trends and record past seawater d super(13)C and d super(18)O.
ISSN:0024-3590