Mismatch between the ecological processes driving early life-stage dynamics of bivalves at two contrasting French Polynesian lagoons
|Author(s)||Lo-Yat Alain1, Monaco Cristián J.1, Thomas Yoann2, Czorlich Yann1, Le Borgne Florian1, Muylaert Morgan1, Le Moullac Gilles1, Vanaa Vincent1, Beliaeff Benoit1, Garen Pierre1|
|Affiliation(s)||1 : UMR241 Ecosystèmes Insulaires Océaniens (EIO), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre du Pacifique, Unité Ressources Marines en Polynésie Française, BP, 49-98725 Taiarapu ouest, Vairao, Tahiti, French Polynesia
2 : IRD LEMAR-IUEM, rue Dumont d'Urville, 29280 Plouzané, France
|Source||Marine Pollution Bulletin (0025-326X) (Elsevier BV), 2022-10 , Vol. 183 , P. 114099 (11p.)|
|Keyword(s)||Bivalve larvae, Spat, Dynamics, Atoll, Pinctada margaritifera, P, maculata|
The pearl-farming industry depends mostly on the natural recruitment of pearl oysters. Little is known about the relative influence of different ecological processes on the natural recruitment of pearl oysters across biogeographical scales. Spatio-temporal dynamics of bivalve larvae and spats were described at Ahe and Mangareva, 1500 km apart across French Polynesia. We quantified the effect of candidate environmental predictors on the dynamics of larvae. Both lagoons showed similar temporal dynamics with twice more larvae and 6 times more spat in Ahe. Pinctada maculata spat were more abundant than for P. margaritifera at both lagoons. While the temporal dynamics in larvae abundance were best explained by a positive effect of temperature in Ahe, the dynamics in Mangareva were poorly predicted by the environmental variables, meaning bivalve early-life stages perform better in Ahe than Mangareva suggesting a mismatch between the relevant environmental forces driving larval dynamics at these two contrasting lagoons.