Heterotrophy promotes the re-establishment of photosynthate translocation in a symbiotic coral after heat stress

Symbiotic scleractinian corals are particularly affected by climate change stress and respond by bleaching (losing their symbiotic dinoflagellate partners). Recently, the energetic status of corals is emerging as a particularly important factor that determines the corals’ vulnerability to heat stres...

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Vydané v:	Scientific reports Ročník 6; číslo 1; s. 38112
Hlavní autori:	Tremblay, Pascale, Gori, Andrea, Maguer, Jean François, Hoogenboom, Mia, Ferrier-Pagès, Christine
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 05.12.2016 Nature Publishing Group
Predmet:	101/58 631/158/2455 64 704/106/694 704/106/829/826 Animals Anthozoa - metabolism Anthozoa - parasitology Anthozoa - physiology Autotrophic Processes - physiology Biodiversity and Ecology Bleaching Calcification Calcification, Physiologic - physiology Carbon Carbon - metabolism Climate Change Corals Dinoflagellates Dinoflagellida - physiology Energy reserves Environmental Sciences Heat stress Heat tolerance Heat-Shock Response - physiology Heterotrophic Processes - physiology Heterotrophy Hot Temperature Humanities and Social Sciences Light multidisciplinary Nutrient deficiency Ocean, Atmosphere Photosynthesis - physiology Science Sciences of the Universe Symbionts Symbiosis - physiology Temperature effects Translocation ocean acidification marine ecosystems organic-carbon fluxes dinoflagellate symbiosis turbinaria-reniformis ACL Scleractinian corals thermal-stress climate-change bleached corals stylophora-pistillata
ISSN:	2045-2322, 2045-2322
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Shrnutí:	Symbiotic scleractinian corals are particularly affected by climate change stress and respond by bleaching (losing their symbiotic dinoflagellate partners). Recently, the energetic status of corals is emerging as a particularly important factor that determines the corals’ vulnerability to heat stress. However, detailed studies of coral energetic that trace the flow of carbon from symbionts to host are still sparse. The present study thus investigates the impact of heat stress on the nutritional interactions between dinoflagellates and coral Stylophora pistillata maintained under auto- and heterotrophy. First, we demonstrated that the percentage of autotrophic carbon retained in the symbionts was significantly higher during heat stress than under non-stressful conditions, in both fed and unfed colonies. This higher photosynthate retention in symbionts translated into lower rates of carbon translocation, which required the coral host to use tissue energy reserves to sustain its respiratory needs. As calcification rates were positively correlated to carbon translocation, a significant decrease in skeletal growth was observed during heat stress. This study also provides evidence that heterotrophic nutrient supply enhances the re-establishment of normal nutritional exchanges between the two symbiotic partners in the coral S. pistillata , but it did not mitigate the effects of temperature stress on coral calcification.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 These authors contributed equally to this work. Present address: Département de biologie, chimie et géographie, Université du Québec à Rimouski, Rimouski, QC, Canada.
ISSN:	2045-2322 2045-2322
DOI:	10.1038/srep38112