Temperature affects the reproductive outputs of coral-eating starfish Acanthaster spp. after adult exposure to near-future ocean warming and acidification

Type Article
Date 2020-12
Language English
Author(s) Hue Thomas1, Chateau Olivier2, Lecellier Gael1, 3, Kayal Mohsen1, Lanos Noeline2, Gossuin Hugues2, Adjeroud Mehdi4, 5, Dumas Pascal1
Affiliation(s) 1 : IRD, UMR 9220 ENTROPIE, BP A5, Noumea, New Caledonia
2 : Laboratory of Marine Biology and Ecology, Aquarium des lagons, 98807, Noumea, New Caledonia
3 : Université de Paris-Saclay, UVSQ, 45 avenue des Etats-Unis, Versailles Cedex, France
4 : UMR 9220 ENTROPIE, IRD, Université de la Réunion, CNRS, IFREMER, Université de la Nouvelle-Calédonie, Perpignan, France
5 : PSL Université Paris, USR 3278 CRIOBE, EPHE-UPVD-CNRS, Perpignan, France
Source Marine Environmental Research (0141-1136) (Elsevier BV), 2020-12 , Vol. 162 , P. 105164 (10p.)
DOI 10.1016/j.marenvres.2020.105164
WOS© Times Cited 5
Keyword(s) Adult exposure, Ocean warming, Ocean acidification, Crown-of-thorns starfish, Reproductive outputs
Abstract

Outbreaks of the coral-eating crown-of-thorns starfish Acanthaster spp. (COTS) have become to be amongst the most severe threats to coral reefs worldwide. Although most research has focused on COTS early development, it remains unclear how COTS populations will keep pace with changing ocean conditions. Since reproduction is a key process contributing to outbreaks, we investigated the reproductive success of adult COTS acclimated for 3–4 months to different treatment combinations of ambient conditions, ocean warming (+2 °C) and acidification (−0.35 pH). Our results suggest that the optimal breeding season in New Caledonia is concentrated around the end of the calendar year, when water temperature reaches >26 °C. We found negative effects of temperature on egg metrics, fertilisation success, and GSI, conflicting with previously documented effects of temperature on echinoderm reproductive outputs. Fertilisation success dropped drastically (more than threefold) with elevated temperature during the late breeding season. In contrast, we detected no effects of near-future acidification conditions on fertilisation success nor GSI. This is the first time that COTS reproduction is compared among individuals acclimated to different conditions of warming and acidification. Our results highlight the importance of accounting for adult exposure to better understand how COTS reproduction may be impacted in the face of global change.

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Hue Thomas, Chateau Olivier, Lecellier Gael, Kayal Mohsen, Lanos Noeline, Gossuin Hugues, Adjeroud Mehdi, Dumas Pascal (2020). Temperature affects the reproductive outputs of coral-eating starfish Acanthaster spp. after adult exposure to near-future ocean warming and acidification. Marine Environmental Research, 162, 105164 (10p.). Publisher's official version : https://doi.org/10.1016/j.marenvres.2020.105164 , Open Access version : https://archimer.ifremer.fr/doc/00656/76808/