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Ocean acidification affects productivity but not the severity of thermal bleaching in some tropical corals

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian Inst Marine Sci
dc.contributor.author NOONAN, SAM H. C.
dc.contributor.author FABRICIUS, KATHARINA E.
dc.date.accessioned 2016-03-04T05:43:00Z
dc.date.accessioned 2016-03-04T05:43:00Z
dc.date.accessioned 2017-03-21T01:01:38Z
dc.date.accessioned 2017-04-18T06:52:07Z
dc.date.available 2016-03-04T05:43:00Z
dc.date.available 2017-03-21T01:01:38Z
dc.date.available 2016-03-04T05:43:00Z
dc.date.available 2017-04-18T06:52:07Z
dc.date.issued 2016-02-01
dc.identifier.citation Noonan SHC, Fabricius KE (2016) Ocean acidification affects productivity but not the severity of thermal bleaching in some tropical corals. ICES Journal of Marine Science 73(3): 715-726 en_US
dc.identifier.issn 1054-3139
dc.identifier.uri http://epubs.aims.gov.au/11068/11614
dc.description.abstract Increasing carbon dioxide (CO2) emissions are raising sea surface temperature (SST) and causing ocean acidification (OA). While higher SST increases the frequency of mass coral bleaching events, it is unclear how OA will interact to affect this process. In this study, we combine in situ bleaching surveys around three tropical CO2 seeps with a 2-month two-factor (CO2 and temperature) tank experiment to investigate how OA and SST in combination will affect the bleaching susceptibility of tropical reef corals. Surveys at CO2 seep and control sites during a minor regional bleaching event gave little indication that elevated pCO(2) influenced the bleaching susceptibility of the wider coral community, the four most common coral families (Acroporidae, Faviidae, Pocilloporidae, or Poritidae), or the thermally sensitive coral species Seriatopora hystrix. In the tank experiment, sublethal bleaching was observed at 31 degrees C after 5 d in S. hystrix and 12 d in Acropora millepora, whereas controls (28 degrees C) did not bleach. None of the measured proxies for coral bleaching was negatively affected by elevated pCO(2) at pH(T) 7.79 (vs. 7.95 pHT in controls), equivalent to similar to 780 atm pCO(2) and an aragonite saturation state of 2.5. On the contrary, high pCO(2) benefitted some photophysiological measures (although temperature effects were much stronger than CO2 effects): maximum photosystem II quantum yields and light-limited electron transport rates increased in both species at high pCO(2), whereas gross photosynthesis and pigment concentrations increased in S. hystrix at high pCO(2). The field and laboratory data in combination suggest that OA levels up to a pHT of 7.8 will have little effect on the sensitivity of tropical corals to thermal bleaching. Indeed, some species appear to be able to utilize the more abundant dissolved inorganic carbon to increase productivity; however, these gains offset only a small proportion of the massive bleaching-related energy losses during thermal stress.
dc.description.sponsorship We thank the communities at Upa Upasina, Esa'Ala, and Dobu for their ongoing support of this project. Thanks also go to S. Uthicke, F. Flores, C. Schmidt, and J. Doyle for assistance in running the laboratory experiment, to J. Strahl for comments on the manuscript, and to Qantas and Qantas Link for continued support. This project was funded by the National Environmental Research Program (NERP 5.2) of the Australian Commonwealth Government's Department of the Environment, and AIMS.
dc.description.sponsorship This project was funded by the National Environmental Research Program (NERP 5.2) of the Australian Commonwealth Government's Department of the Environment, and AIMS. en_US
dc.description.uri http://icesjms.oxfordjournals.org/content/early/2015/07/21/icesjms.fsv127.full?sid=4a31d732-0bf9-45f1-82a8-160d8e511015 en_US
dc.language English
dc.language.iso en en_US
dc.publisher Oxford Journals en_US
dc.relation.ispartof Null
dc.subject Great-barrier-reef
dc.subject Scleractinian Coral
dc.subject Marine & Freshwater Biology
dc.subject Oceanography
dc.subject Responses
dc.subject Carbon-dioxide
dc.subject Climate-change
dc.subject Calcification
dc.subject Marginopora Vertebralis
dc.subject Partial-pressure
dc.subject Photosynthesis
dc.subject Growth
dc.subject Fisheries
dc.subject Photophysiology en_US
dc.subject Carbon Limitation en_US
dc.subject Carbon Dioxide en_US
dc.subject Interactive Effects en_US
dc.subject Coral Reef en_US
dc.subject Global Climate Change en_US
dc.title Ocean acidification affects productivity but not the severity of thermal bleaching in some tropical corals
dc.type journal article en_US
dc.identifier.doi 10.1093/icesjms/fsv127
dc.identifier.wos WOS:000371142000021


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