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The same but different: stable isotopes reveal two distinguishable, yet similar, neighbouring food chains in a coral reef

  • Baptiste Le Bourg (a1) (a2), Yves Letourneur (a3), Daniela Bănaru (a1), Jean Blanchot (a1), Cristèle Chevalier (a1), Gérard Mou-Tham (a4), Benoit Lebreton (a5) and Marc Pagano (a1)...

Abstract

Stable isotope compositions were studied in particulate organic matter (POM), zooplankton and different trophic groups of teleosts to compare food chains based on plankton at two sites (lagoon and outer slope) in a New Caledonian coral reef. For each trophic compartment, δ13C values were always lower in the outer slope than in the lagoon. This result may be explained by potential differences in POM composition between the two environments, suggesting that the two food chains are based on different primary sources of carbon. In contrast, δ15N values did not vary between the lagoon and the outer slope, indicating that these two food chains presented similar length and trophic levels, despite being distinguishable.

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Corresponding author

Correspondence should be addressed to: B. Le Bourg, Université de Liège, Laboratory of Oceanology, MARE Centre, 4000 Liège, Belgium email: baptiste.lebourg@doct.ulg.ac.be

References

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The same but different: stable isotopes reveal two distinguishable, yet similar, neighbouring food chains in a coral reef

  • Baptiste Le Bourg (a1) (a2), Yves Letourneur (a3), Daniela Bănaru (a1), Jean Blanchot (a1), Cristèle Chevalier (a1), Gérard Mou-Tham (a4), Benoit Lebreton (a5) and Marc Pagano (a1)...

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