碩士 / 國立東華大學 / 海洋生物研究所 / 106 / Ocean acidification (OA) and warming are potential threats to marine ecosystems through their influence on marine organisms. One of the most critical effects of increasing OA and warming relates to the reduction of calcium carbonate to marine calcifying macroalgae. Calcifying macroalgae are sensitive to the increases in seawater temperature and CO2 predicted with global climate change due to the negative effects of these changes on the process of calcification. However, seagrass communities are one of the most productive and dynamic ecosystems. Seagrasses are capable of capturing and storing a large amount of carbon from the atmosphere and act as substrate stabilizers. Thus, the aim of this study is to explore whether seagrasses can help calcifying macroalgae to resist the OA and warming condition. The experiment was started on March of 2017 at a coral reef mesocosm using three species of calcifying macroalgae (Mastophora rosea, Halimeda opuntia, and Mesophyllum sp) and carried out for more than 12 weeks. The experimental design had two treatments with three replicates: presence of seagrass and absence of seagrass (about 30% cover and density of 63.03 ind/m2). After acclimatization for two weeks, the experiment was carried out in three stages: the first stage was enriched CO2 for 4 weeks, and the second stage was enriched CO2 and elevated temperature at 28oC for 4 weeks and the third stage was enriched CO2 and elevated temperature at 31oC for 2 weeks. The results of ocean acidification and warming indicate a negative effect on calcification and mortality of M. rosea. Similarly, calcification and mortality of H. opuntia showed negative effect but only under warming condition. However, calcification and mortality of Mesophyllum sp showed no effect under ocean acidification and warming condition. In addition, quantum yield of photosynthesis showed no effect under ocean acidification and warming condition in all species. In fact, calcification, mortality and quantum yield of photosynthesis showed no significant different between treatment with seagrass and without seagrass in all species of calcifying macroalgae. Thus, seagrass did not appear to alleviate the detrimental effects of OA and high temperatures on these calcifying algae species. The response of M. rosea and H. opuntia are more sensitive to environmental stressors, such as OA and warming may influenced by their ecological habitat in subtidal areas. However, Mesophyllum sp is more tolerances for fluctuating temperature and pCO2 and may survive for future global change.
| Identifer | oai:union.ndltd.org:TW/106NDHU5277010 |
| Date | January 2018 |
| Creators | Khaerul Awaluddin, Khaerul Awaluddin |
| Contributors | Pi-Jen Liu, 劉弼仁 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 55 |
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