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- W2284453447 abstract "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 pCO2 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°C after 5 d in S. hystrix and 12 d in Acropora millepora, whereas controls (28°C) did not bleach. None of the measured proxies for coral bleaching was negatively affected by elevated pCO2 at pHT 7.79 (vs. 7.95 pHT in controls), equivalent to ∼780 µatm pCO2 and an aragonite saturation state of 2.5. On the contrary, high pCO2 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 pCO2, whereas gross photosynthesis and pigment concentrations increased in S. hystrix at high pCO2. 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." @default.
- W2284453447 created "2016-06-24" @default.
- W2284453447 creator A5051206168 @default.
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- W2284453447 date "2015-07-22" @default.
- W2284453447 modified "2023-10-06" @default.
- W2284453447 title "Ocean acidification affects productivity but not the severity of thermal bleaching in some tropical corals" @default.
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- W2284453447 doi "https://doi.org/10.1093/icesjms/fsv127" @default.
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