Heat stress destabilizes symbiotic nutrient cycling in corals

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Radecker , N , Pogoreutz , C , Gegner , H M , Cardenas , A , Roth , F , Bougoure , J , Guagliardo , P , Wild , C , Pernice , M , Raina , J-B , Meibom , A & Voolstra , C R 2021 , ' Heat stress destabilizes symbiotic nutrient cycling in corals ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 118 , no. 5 , 2022653118 . https://doi.org/10.1073/pnas.2022653118

Title: Heat stress destabilizes symbiotic nutrient cycling in corals
Author: Radecker, Nils; Pogoreutz, Claudia; Gegner, Hagen M.; Cardenas, Anny; Roth, Florian; Bougoure, Jeremy; Guagliardo, Paul; Wild, Christian; Pernice, Mathieu; Raina, Jean-Baptiste; Meibom, Anders; Voolstra, Christian R.
Contributor organization: Tvärminne Zoological Station
Date: 2021-02-02
Language: eng
Number of pages: 11
Belongs to series: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
DOI: https://doi.org/10.1073/pnas.2022653118
URI: http://hdl.handle.net/10138/327871
Abstract: Recurrent mass bleaching events are pushing coral reefs world-wide to the brink of ecological collapse. While the symptoms and consequences of this breakdown of the coral-algal symbiosis have been extensively characterized, our understanding of the underlying causes remains incomplete. Here, we investigated the nutrient fluxes and the physiological as well as molecular responses of the widespread coral Stylophora pistillata to heat stress prior to the onset of bleaching to identify processes involved in the break-down of the coral-algal symbiosis. We show that altered nutrient cycling during heat stress is a primary driver of the functional breakdown of the symbiosis. Heat stress increased the metabolic energy demand of the coral host, which was compensated by the catabolic degradation of amino acids. The resulting shift from net uptake to release of ammonium by the coral holobiont subsequently promoted the growth of algal symbionts and retention of photosynthates. Together, these processes form a feedback loop that will gradually lead to the decoupling of carbon translocation from the symbiont to the host. Energy limitation and altered symbiotic nutrient cycling are thus key factors in the early heat stress response, directly contributing to the breakdown of the coral-algal symbiosis. Interpreting the stability of the coral holobiont in light of its metabolic interactions provides a missing link in our understanding of the environmental drivers of bleaching and may ultimately help uncover fundamental processes underpinning the functioning of endosymbioses in general.
Subject: coral bleaching
metabolic interaction
resource competition
selfish symbiont
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion

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