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Host-symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress.
Sci Rep. 2019 07 10; 9(1):9985.SR

Abstract

High sea surface temperatures often lead to coral bleaching wherein reef-building corals lose significant numbers of their endosymbiotic dinoflagellates (Symbiodiniaceae). These increasingly frequent bleaching events often result in large scale coral mortality, thereby devasting reef systems throughout the world. The reef habitats surrounding Palau are ideal for investigating coral responses to climate perturbation, where many inshore bays are subject to higher water temperature as compared with offshore barrier reefs. We examined fourteen physiological traits in response to high temperature across various symbiotic dinoflagellates in four common Pacific coral species, Acropora muricata, Coelastrea aspera, Cyphastrea chalcidicum and Pachyseris rugosa found in both offshore and inshore habitats. Inshore corals were dominated by a single homogenous population of the stress tolerant symbiont Durusdinium trenchii, yet symbiont thermal response and physiology differed significantly across coral species. In contrast, offshore corals harbored specific species of Cladocopium spp. (ITS2 rDNA type-C) yet all experienced similar patterns of photoinactivation and symbiont loss when heated. Additionally, cell volume and light absorption properties increased in heated Cladocopium spp., leading to a greater loss in photo-regulation. While inshore coral temperature response was consistently muted relative to their offshore counterparts, high physiological variability in D. trenchii across inshore corals suggests that bleaching resilience among even the most stress tolerant symbionts is still heavily influenced by their host environment.

Authors+Show Affiliations

School of Marine Science and Policy, University of Delaware, Lewes, DE, United States. khoadley@geomar.de. GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany. khoadley@geomar.de.Department of Biology, Pennsylvania State University, University park, PA, United States.Department of Biology, Pennsylvania State University, University park, PA, United States.School of Marine Science and Policy, University of Delaware, Lewes, DE, United States.School of Marine Science and Policy, University of Delaware, Lewes, DE, United States.Science Under Sail, Sarasota, United States.Department of Biology, University of Alabama at Birmingham, Birmingham, AL, United States.Department of Biology, Pennsylvania State University, University park, PA, United States.School of Marine Science and Policy, University of Delaware, Lewes, DE, United States.

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

31292499

Citation

Hoadley, Kenneth D., et al. "Host-symbiont Combinations Dictate the Photo-physiological Response of Reef-building Corals to Thermal Stress." Scientific Reports, vol. 9, no. 1, 2019, p. 9985.
Hoadley KD, Lewis AM, Wham DC, et al. Host-symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress. Sci Rep. 2019;9(1):9985.
Hoadley, K. D., Lewis, A. M., Wham, D. C., Pettay, D. T., Grasso, C., Smith, R., Kemp, D. W., LaJeunesse, T. C., & Warner, M. E. (2019). Host-symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress. Scientific Reports, 9(1), 9985. https://doi.org/10.1038/s41598-019-46412-4
Hoadley KD, et al. Host-symbiont Combinations Dictate the Photo-physiological Response of Reef-building Corals to Thermal Stress. Sci Rep. 2019 07 10;9(1):9985. PubMed PMID: 31292499.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Host-symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress. AU - Hoadley,Kenneth D, AU - Lewis,Allison M, AU - Wham,Drew C, AU - Pettay,D Tye, AU - Grasso,Chris, AU - Smith,Robin, AU - Kemp,Dustin W, AU - LaJeunesse,Todd C, AU - Warner,Mark E, Y1 - 2019/07/10/ PY - 2019/04/11/received PY - 2019/06/24/accepted PY - 2019/7/12/entrez PY - 2019/7/12/pubmed PY - 2019/7/12/medline SP - 9985 EP - 9985 JF - Scientific reports JO - Sci Rep VL - 9 IS - 1 N2 - High sea surface temperatures often lead to coral bleaching wherein reef-building corals lose significant numbers of their endosymbiotic dinoflagellates (Symbiodiniaceae). These increasingly frequent bleaching events often result in large scale coral mortality, thereby devasting reef systems throughout the world. The reef habitats surrounding Palau are ideal for investigating coral responses to climate perturbation, where many inshore bays are subject to higher water temperature as compared with offshore barrier reefs. We examined fourteen physiological traits in response to high temperature across various symbiotic dinoflagellates in four common Pacific coral species, Acropora muricata, Coelastrea aspera, Cyphastrea chalcidicum and Pachyseris rugosa found in both offshore and inshore habitats. Inshore corals were dominated by a single homogenous population of the stress tolerant symbiont Durusdinium trenchii, yet symbiont thermal response and physiology differed significantly across coral species. In contrast, offshore corals harbored specific species of Cladocopium spp. (ITS2 rDNA type-C) yet all experienced similar patterns of photoinactivation and symbiont loss when heated. Additionally, cell volume and light absorption properties increased in heated Cladocopium spp., leading to a greater loss in photo-regulation. While inshore coral temperature response was consistently muted relative to their offshore counterparts, high physiological variability in D. trenchii across inshore corals suggests that bleaching resilience among even the most stress tolerant symbionts is still heavily influenced by their host environment. SN - 2045-2322 UR - https://www.unboundmedicine.com/medline/citation/31292499/Host_symbiont_combinations_dictate_the_photo_physiological_response_of_reef_building_corals_to_thermal_stress_ L2 - https://doi.org/10.1038/s41598-019-46412-4 DB - PRIME DP - Unbound Medicine ER -