Host–symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress

Hoadley, Kenneth D., Lewis, Allison M., Wham, Drew C., Pettay, D. Tye, Grasso, Chris, Smith, Robin, Kemp, Dustin W., LaJeunesse, Todd C. and Warner, Mark E. (2019) Host–symbiont combinations dictate the photo-physiological response of reef-building corals to thermal stress Scientific Reports, 9 (1). Art.Nr. 9985. DOI 10.1038/s41598-019-46412-4.

[img]
Preview
Text
s41598-019-46412-4.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (4Mb) | Preview
[img] Text
41598_2019_46412_MOESM1_ESM.docx - Supplemental Material
Available under License Creative Commons: Attribution 4.0.

Download (65Kb)

Supplementary data:

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.

Document Type: Article
Keywords: 2 SCLERACTINIAN CORALS; FAST REPETITION RATE; CLIMATE-CHANGE; ELECTRON-TRANSPORT; PORITES-ASTREOIDES; SYMBIODINIUM SPP.; GENETIC DIVERSITY; LIGHT-ABSORPTION; CHLOROPHYLL-A; HEAT-STRESS
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-OEB Ökosystembiologie des Ozeans
Refereed: Yes
DOI etc.: 10.1038/s41598-019-46412-4
ISSN: 2045-2322
Related URLs:
Date Deposited: 25 Jul 2019 07:24
Last Modified: 25 Jul 2019 07:24
URI: http://eprints.uni-kiel.de/id/eprint/47249

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...