期刊
PLOS ONE
卷 10, 期 7, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0133406
关键词
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资金
- Assessment of the Atlantic bluefin TunA population breeding in the western MEditerranean (ATAME) - Spanish Ministry of Science and Innovation [CTM2011-29525-C04-02]
- Accounting for the Influence of Feeding Success on the Growth and Survival of Bluefin Tuna Larvae in Stock Assessment Efforts [13BTRP009]
- Spanish Institute of Oceanography of the Spanish Ministry of Economy and Competitively [FPI-IEO (2011/03)]
The present study uses stable isotopes of nitrogen and carbon (delta(15)Nand delta C-13) as trophic indicators for Atlantic bluefin tuna larvae (BFT) (6-10 mm standard length) in the highly contrasting environmental conditions of the Gulf of Mexico (GOM) and the Balearic Sea (MED). These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and more productive. MED BFT larvae showed the highest delta N-15 signatures, implying an elevated trophic position above the underlying microzooplankton baseline. Ontogenetic dietary shifts were observed in the BFT larvae from the GOM and MED which indicates early life trophodynamics differences between these spawning habitats. Significant trophic differences between the GOM and MED larvae were observed in relation to delta N-15 signatures in favour of the MED larvae, which may have important implications in their growth during their early life stages. These low delta N-15 levels in the zooplankton from the GOM may be an indication of a shifting isotopic baseline in pelagic food webs due to diatrophic inputs by cyanobacteria. Lack of enrichment for delta N-15 in BFT larvae compared to zooplankton implies an alternative grazing pathway from the traditional food chain of phytoplankton-zooplankton-larval fish. Results provide insight for a comparative characterization of the trophic pathways variability of the two main spawning grounds for BFT larvae.
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