Multi-trophic markers illuminate the understanding of the functioning of a remote, low coral cover Marquesan coral reef food webAbstract

TitreMulti-trophic markers illuminate the understanding of the functioning of a remote, low coral cover Marquesan coral reef food webAbstract
Type de publicationJournal Article
Year of Publication2021
AuteursFey, P, Parravicini, V, Bănaru, D, Dierking, J, Galzin, R, Lebreton, B, Meziane, T, Polunin, NVC, Zubia, M, Letourneur, Y
JournalScientific Reports
Volume11
Ticket1
Date PublishedJan-12-2021
Résumé

We studied the food web structure and functioning of a coral reef ecosystem in the Marquesas Islands, French Polynesia, characterized by low coral cover, high sea surface temperature and meso- to eutrophic waters. The Marquesas constitute a relevant ecosystem to understand the functioning of low diversity reefs that are also subject to global change. A multi-tracer assessment of organic matter pathways was run to delineate ecosystem functioning, using analysis of fatty acids, bulk and compound specific stable isotope analysis and stable isotopes mixing models. Macroalgae and phytoplankton were the two major food sources fueling this food web with, however, some marked seasonal variations. Specifically, zooplankton relied on phytoplankton-derived organic matter and herbivorous fishes on macroalgae-derived organic matter to a much higher extent in summer than in winter (~ 75% vs. ~ 15%, and ~ 70 to 75% vs. ~ 5 to 15%, respectively) . Despite remarkably high δ15N values for all trophic compartments, likely due to local dynamics in the nitrogen stock, trophic levels of consumers were similar to those of other coral reef ecosystems. These findings shed light on the functioning of low coral cover systems, which are expected to expand worldwide under global change.

URLhttps://www.nature.com/articles/s41598-021-00348-w
DOI10.1038/s41598-021-00348-w
Short TitleSci Rep
Catégorie HCERES
ACL - Articles dans des revues à comité de lecture
Publication coopération et recherche SUD
Oui