Bivalve δN isoscapes provide a baseline for urban nitrogen footprint at the edge of a World Heritage coral reef.

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ID: 84805
2020
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Abstract
Eutrophication is a major threat to world's coral reefs. Here, we mapped the distribution of the anthropogenic nitrogen footprint around Nouméa, a coastal city surrounded by 15,743 km of UNESCO listed reefs. We measured the δN signature of 348 long-lived benthic bivalves from 12 species at 27 sites and interpolated these to generate a δN isoscape. We evaluated the influence of water residence times on nitrogen enrichment and predicted an eutrophication risk at the UNESCO core area. Nitrogen isoscapes revealed a strong spatial gradient (4.3 to 11.7‰) from the outer lagoon to three highly exposed bays of Nouméa. Several protected reefs would benefit from an improved management of wastewater outputs, while one bay in the UNESCO core area may suffer a high eutrophication risk in the future. Our study reinforces the usefulness of using benthic animals to characterize the anthropogenic N-footprint and provide a necessary baseline for both ecologists and policy makers.
Reference Key
thibault2020bivalvemarine Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Thibault, M;Duprey, N;Gillikin, D P;Thébault, J;Douillet, P;Chauvaud, L;Amice, E;Munaron, J M;Lorrain, A;
Journal Marine pollution bulletin
Year 2020
DOI
S0025-326X(19)31026-4
URL
Keywords
eutrophication coral reefs isoscape bivalve heritage sites δ(15)n

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