Responses of branching reef corals Acropora digitifera and Montipora digitata to elevated temperature and pCO2
| Autor: | Aika Miyagi, Yukihiro Nojiri, Yasuaki Tanaka, Cristiana Manullang, Kazuhiko Sakai, Akira Iguchi, Intan Herwindra Millyaningrum |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Conservation Biology Effects of global warming on oceans Marine Biology Photosynthetic efficiency Endosymbiont species 010603 evolutionary biology 01 natural sciences General Biochemistry Genetics and Molecular Biology Montipora digitata Animal science Ocean warming medicine Acropora digitifera Reef geography geography.geographical_feature_category biology Chemistry Ocean acidification 010604 marine biology & hydrobiology General Neuroscience General Medicine biology.organism_classification medicine.disease Corals Calcification rate Climate Change Biology Seawater General Agricultural and Biological Sciences Zoology Calcification |
| Zdroj: | PeerJ |
| ISSN: | 2167-8359 |
| DOI: | 10.7717/peerj.10562 |
| Popis: | Anthropogenic emission of CO2 into the atmosphere has been increasing exponentially, causing ocean acidification (OA) and ocean warming (OW). The “business-as-usual” scenario predicts that the atmospheric concentration of CO2 may exceed 1,000 µatm and seawater temperature may increase by up to 3 °C by the end of the 21st century. Increases in OA and OW may negatively affect the growth and survival of reef corals. In the present study, we separately examined the effects of OW and OA on the corals Acropora digitifera and Montipora digitata, which are dominant coral species occurring along the Ryukyu Archipelago, Japan, at three temperatures (28 °C, 30 °C, and 32 °C) and following four pCO2 treatments (400, 600, 800, and 1,000 µatm) in aquarium experiments. In the OW experiment, the calcification rate (p = 0.02), endosymbiont density, and maximum photosynthetic efficiency (Fv/Fm) (both p 2 increased (p Fv/Fm were not affected. The calcification rate of A. digitifera showed greater decreases from 30 °C to 32 °C than that of M. digitata. The calcification of the two species responded differently to OW and OA. These results suggest that A. digitifera is more sensitive to OW than M. digitata, whereas M. digitata is more sensitive to OA. Thus, differences in the sensitivity of the two coral species to OW and OA might be attributed to differences in the endosymbiont species and high calcification rates, respectively. |
| Databáze: | OpenAIRE |
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