Coral cover surveys corroborate predictions on reef adaptive potential to thermal stress

Type Article
Date 2020-11
Language English
Author(s) Selmoni Oliver1, 2, Lecellier Gaël2, 3, Vigliola Laurent2, Berteaux-Lecellier Véronique2, Joost Stéphane1
Affiliation(s) 1 : Laboratory of Geographic Information Systems, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
2 : UMR250/9220 ENTROPIE IRD-CNRS-Ifremer-UNC-UR, Labex CORAIL, Nouméa, New Caledonia, France
3 : UVSQ, Université de Paris-Saclay, Versailles, France
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-11 , Vol. 10 , N. 1 , P. 19680 (13p.)
DOI 10.1038/s41598-020-76604-2

As anomalous heat waves are causing the widespread decline of coral reefs worldwide, there is an urgent need to identify coral populations tolerant to thermal stress. Heat stress adaptive potential is the degree of tolerance expected from evolutionary processes and, for a given reef, depends on the arrival of propagules from reefs exposed to recurrent thermal stress. For this reason, assessing spatial patterns of thermal adaptation and reef connectivity is of paramount importance to inform conservation strategies. In this work, we applied a seascape genomics framework to characterize the spatial patterns of thermal adaptation and connectivity for coral reefs of New Caledonia (Southern Pacific). In this approach, remote sensing of seascape conditions was combined with genomic data from three coral species. For every reef of the region, we computed a probability of heat stress adaptation, and two indices forecasting inbound and outbound connectivity. We then compared our indicators to field survey data, and observed that decrease of coral cover after heat stress was lower at reefs predicted with high probability of adaptation and inbound connectivity. Last, we discussed how these indicators can be used to inform local conservation strategies and preserve the adaptive potential of New Caledonian reefs.

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