Optical feedback loop involving dinoflagellate symbiont and Scleractinian host drives colorful coral bleaching

Bollati, Elena, D'Angelo, Cecilia, Alerdice, Rachel, Pratchett, Morgan, Ziegler, Maren, and Wiedenmann, Jorg (2020) Optical feedback loop involving dinoflagellate symbiont and Scleractinian host drives colorful coral bleaching. Current Biology, 30 (13). pp. 2433-2445.

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Abstract

Coral bleaching, caused by the loss of brownish-colored dinoflagellate photosymbionts from the host tissue of reef-building corals, is a major threat to reef survival. Occasionally, bleached corals become exceptionally colorful rather than white. These colors derive from photoprotective green fluorescent protein (GFP)-like pigments produced by the coral host. There is currently no consensus regarding what causes colorful bleaching events and what the consequences for the corals are. Here, we document that colorful bleaching events are a recurring phenomenon in reef regions around the globe. Our analysis of temperature conditions associated with colorful bleaching events suggests that corals develop extreme coloration within 2 to 3 weeks after exposure to mild or temporary heat stress. We demonstrate that the increase of light fluxes in symbiont depleted tissue promoted by reflection of the incident light from the coral skeleton induces strong expression of the photoprotective coral host pigments. We describe an optical feedback loop involving both partners of the association, discussing that themitigation of light stress offered by host pigments could facilitate recolonization of bleached tissue by symbionts. Our data indicate that colorful bleaching has the potential to identify local environmental factors, such as nutrient stress, that can exacerbate the impact of elevated temperatures on corals, to indicate the severity of heat stress experienced by corals and to gauge their post-stress recovery potential.

Item ID: 63857
Item Type: Article (Research - C1)
ISSN: 1879-0445
Copyright Information: (C) 2020 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Funders: Natural Environmental Research Council (NERC), Deutsche Forschungsgemeinschaft (DFG), European Research Council (ERC)
Projects and Grants: NERC NE/L002531, NERC NE/I01683X/1, NERC NE/K00641X/1, NERC NE/I012648/, DFG i1990/2-, ERC grant agreement no. 311179
Date Deposited: 13 Aug 2020 03:29
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 60%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 40%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 40%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 60%
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