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Long-term exposure to increasing temperatures on scleractinian coral fragments reveals oxidative stress
- Dias, Marta, Ferreira, Ana, Gouveia, Raúl, Madeira, Carolina, Jogee, Nadia, Cabral, Henrique, Diniz, Mário, Vinagre, Catarina
- Marine environmental research 2019 v.150 pp. 104758
- Scleractinia, catalase, chronic exposure, coral bleaching, corals, enzyme activity, global warming, glutathione transferase, heat stress, lipid peroxidation, mortality, oxidative stress, storms, temperature
- Global warming is leading to increases in tropical storms' frequency and intensity, allowing fragmentation of reef-forming coral species, but also to coral bleaching and mortality. The first level of organism's response to an environmental perturbation occurs at the cellular level. This study investigated the long-term oxidative stress on fragments of nine Indo-Pacific reef-forming coral species exposed for 60 days to increasing temperatures (30 °C and 32 °C) and compared results with control temperature (26 °C). Coral overall condition (appearance), lipid peroxidation (LPO), catalase activity (CAT), and glutathione S-transferase (GST) were assessed. The species Turbinaria reniformis, Galaxea fascicularis, and Psammocora contigua were the most resistant to heat stress, presenting no oxidative damage at 30 °C. Unlike G. fasciularis, both T. reniformis and P. contigua showed no evidence of oxidative damage at 32 °C. All remaining species' fragments died at 32 °C. Stylophora pistillata and Pocillopora damicornis were the most susceptible species to heat stress, not resisting at 30 °C.