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Marine Ecology Progress Series

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MEPS 689:47-56 (2022)  -  DOI:

High CO2 inhibits substratum exploration and settlement of coral larvae

Hendrikje Jorissen1,*, Anaïs Martin2, Lauranne Sarribouette3, Laetitia Hédouin1,4, Maggy M. Nugues1,4

1EPHE, PSL Research University, UPVD-CNRS, USR3278 CRIOBE, 66860 Perpignan, France
2Paris Descartes University, Interdisciplinary Research Center, 75004 Paris, France
3University of Bordeaux, 33076 Bordeaux, France
4Labex Corail, CRIOBE, 98729 Moorea, French Polynesia
*Corresponding author:

ABSTRACT: Biological and physical factors affecting coral recruitment are critical in influencing the recovery of coral communities after disturbance. While ocean acidification (OA) can reduce coral settlement and the early growth of coral recruits, the impact of OA on coral larval swimming behavior is unknown. Here, we investigated the effects of elevated CO2 on the swimming behavior and settlement of coral larvae of 2 common Acropora species. Larvae were exposed to 4 CO2 partial pressure ( pCO2) conditions consistent with the current Intergovernmental Panel for Climate Change predictions for the next few centuries ( pCO2: 393, 853, 1485 and 3022 µatm; pH: 8.1, 7.8, 7.6 and 7.3) in 2 laboratory experiments. We found that bottom exploration, expressed as the proportion of A. cytherea and A. pulchra larvae present in the bottom part of experimental cylinders, decreased by 92 and 98%, respectively, from the ambient to highest CO2 treatment. When offered the choice to settle on the crustose coralline algae Titanoderma prototypum, a well-known positive settlement cue, the percentage of larvae that settled on the fragments declined rapidly as pCO2 increased, with no larvae settling in the highest CO2 treatment. These results suggest that OA may negatively affect coral recruitment via direct effects on larval swimming behavior, with larvae avoiding benthic probing in response to high CO2.

KEY WORDS: Ocean acidification · Settlement · Recruitment · Coral larvae · Larvae behavior · Acropora

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Cite this article as: Jorissen H, Martin A, Sarribouette L, Hédouin L, Nugues MM (2022) High CO2 inhibits substratum exploration and settlement of coral larvae. Mar Ecol Prog Ser 689:47-56.

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