Diatom-Specific Highly Branched Isoprenoids as Biomarkers in Antarctic Consumers
| Type | Article | ||||||||
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| Date | 2013-02-13 | ||||||||
| Language | English | ||||||||
| Author(s) | Goutte Aurelie1, Cherel Yves2, Houssais Marie-Noelle1, Klein Vincent1, Ozouf-Costaz Catherine3, Raccurt Mireille4, Robineau Camille1, Masse Guillaume1, 5, 6 | ||||||||
| Affiliation(s) | 1 : Univ Paris 06, UMR CNRS 7159, Lab Oceanog & Climat Experimentat & Approches Num, Paris, France. 2 : Ctr Etud Biol Chize, UPR 1934 CNRS, Beauvoir Sur Niort, France. 3 : Museum Natl Hist Nat, UMR CNRS 7138, F-75231 Paris, France. 4 : Univ Lyon, UMR CNRS 5023, Villeurbanne, France. 5 : CNRS, Takuvik, PQ, Canada. 6 : Univ Laval, UMI 3376, Takuvik, PQ, Canada. |
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| Source | Plos One (1932-6203) (Public Library Science), 2013-02-13 , Vol. 8 , N. 2 , P. e56504 | ||||||||
| DOI | 10.1371/journal.pone.0056504 | ||||||||
| WOS© Times Cited | 13 | ||||||||
| Abstract | The structure, functioning and dynamics of polar marine ecosystems are strongly influenced by the extent of sea ice. Ice algae and pelagic phytoplankton represent the primary sources of nutrition for higher trophic-level organisms in seasonally ice-covered areas, but their relative contributions to polar marine consumers remain largely unexplored. Here, we investigated the potential of diatom-specific lipid markers and highly branched isoprenoids (HBIs) for estimating the importance of these two carbon pools in an Antarctic pelagic ecosystem. Using GC-MS analysis, we studied HBI biomarkers in key marine species over three years in Adelie Land, Antarctica: euphausiids (ice krill Euphausia crystallorophias and Antarctic krill E. superba), fish (bald notothens Pagothenia borchgrevinki and Antarctic silverfish Pleuragramma antarcticum) and seabirds (Adelie penguins Pygoscelis adeliae, snow petrels Pagodroma nivea and cape petrels Daption capense). This study provides the first evidence of the incorporation of HBI lipids in Antarctic pelagic consumers. Specifically, a di-unsaturated HBI (diene) of sea ice origin was more abundant in ice-associated species than in pelagic species, whereas a tri-unsaturated HBI (triene) of phytoplanktonic origin was more abundant in pelagic species than in ice-associated species. Moreover, the relative abundances of diene and triene in seabird tissues and eggs were higher during a year of good sea ice conditions than in a year of poor ice conditions. In turn, the higher contribution of ice algal derived organic matter to the diet of seabirds was related to earlier breeding and higher breeding success. HBI biomarkers are a promising tool for estimating the contribution of organic matter derived from ice algae in pelagic consumers from Antarctica. | ||||||||
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