Loss of symbiont infectivity following thermal stress can be a factor limiting recovery from bleaching in cnidarians

Kishimoto, Mariko, Baird, Andrew H., Maruyama, Shinichiro, Minagawa, Jun, and Takahashi, Shunichi (2020) Loss of symbiont infectivity following thermal stress can be a factor limiting recovery from bleaching in cnidarians. ISME Journal: multidisciplinary journal of microbial ecology, 14. pp. 3149-3152.

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Increases in seawater temperature can cause coral bleaching through loss of symbiotic algae (dinoflagellates of the family Symbiodiniaceae). Corals can recover from bleaching by recruiting algae into host cells from the residual symbiont population or from the external environment. However, the high coral mortality that often follows mass-bleaching events suggests that recovery is often limited in the wild. Here, we examine the effect of pre-exposure to heat stress on the capacity of symbiotic algae to infect cnidarian hosts using the Aiptasia (sea-anemone)-Symbiodiniaceae model system. We found that the symbiont strainBreviolumsp. CS-164 (ITS2 type B1), both free-living and in symbiosis, loses the capacity to infect the host following exposure to heat stress. This loss of infectivity is reversible, however, a longer exposure to heat stress increases the time taken for reversal. Under the same experimental conditions, the loss of infectivity was not observed in another strainBreviolum psygmophilumCCMP2459 (ITS2 type B2). Our results suggest that recovery from bleaching can be limited by the loss of symbiont infectivity following exposure to heat stress.

Item ID: 64339
Item Type: Article (Research - C1)
ISSN: 1751-7370
Copyright Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2020.
Funders: Japan Society for Promotion of Science (JSPS), National Institute for Basic Biology (NIBB), Gordon and Betty Moore Foundation (GBMF), Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies (CE)
Projects and Grants: JSPS KAKENHI Grant 20H0330, JSPS KAKENHI Grant 18K19240, JSPS KAKENHI Grant 16H06552, NIBB Collaborative Research Program 18-321 & 19-332, GBMF Marine Microbiology Initiative 4985
Date Deposited: 09 Sep 2020 07:40
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180504 Marine biodiversity @ 100%
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