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Article Dans Une Revue Marine Ecology Progress Series Année : 2004

Nutrient-induced perturbations to δ13C and δ15N in symbiotic dinoflagellates and their coral hosts

Résumé

Inorganic nutrients play a critical role in determining benthic community structure in tropical seas. This study examined the impact of adding inorganic nutrients (ammonium and phosphate) on the isotopic composition of 2 reef-building corals, Pocillopora damicornis and Heliofungia actiniformis, on the southern Great Barrier Reef. The addition of elevated nutrients to patch reefs that pond at low tide did not perturb the C:N ratio of either species or their symbiotic dinoflagellates. The C:N ratios were significantly higher in material extracted from the skeleton (14.8 ± 1.50 and 10.8 ± 1.42) than either host (7.6 ± 0.87 and 6.0 ± 0.71) or symbiotic dinoflagellates (5.7 ± 0.48 and 6.9 ± 0.66) (P. damicornis and H. actiniformis respectively; ±95 confidence intervals). The ratio of acquired N to background N suggests that the added dissolved inorganic nitrogen (DIN) accounted for 50 to 100% of total nitrogen within the tissues of P. damicornis and H. actiniformis at the end of the experiment. The addition of the isotopically depleted nutrients (δ15N = 0‰) to patch reefs significantly decreased δ15N from control values of between 3 and 4 to values to below 1 in the case of all compartments, while δ13C values were relatively unresponsive to nutrient treatments. These findings suggest that coral δ15N has the potential to provide a historical record of the δ15N of dissolved nitrogen surrounding reef-building corals and their symbiotic dinoflagellates.
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Dates et versions

hal-02379965 , version 1 (26-11-2019)

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Ove Hoegh-Guldberg, L. Muscatine, Claire Goiran, Dorthe Siggaard, Guy Marion. Nutrient-induced perturbations to δ13C and δ15N in symbiotic dinoflagellates and their coral hosts. Marine Ecology Progress Series, 2004, 280, pp.105-114. ⟨10.3354/meps280105⟩. ⟨hal-02379965⟩

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