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Speaker：楊姍樺

Title：珊瑚骨骼環境與微生物

Time：3/23 (Tue) 13:20~15:10

Location：Room 232 of IONTU

Abstract：
Recently, microbes raise as major contributors of the high diversity characteristics of the coral holobiont. Their distribution, as well as their functions, remains poorly understood despite considerable belief on the critical role they may play in the coral physiology and response to environmental stressors. Here, using the common Indo-Pacific coral Isopora palifera as a model species, we study on microbial communities and function of green sulfur bacteria (GSB) associated to coral skeleton. Our multidisciplinary approach combined morphology analysis, metagenomes, pigment identification, and cultures of anaerobic bacteria isolated from the coral skeleton. We characterized a diverse and dynamic community of endolithic microbes shaped by the availability of light and oxygen in coral skeletons. Our results highlight the advantages of living within I. palifera skeletons, and shed light on the role of Prosthecochloris clade of GSB to do nitrogen fixation. Furthermore, we investigated the endolithic bacterial dynamics under the stress of acidification treatment, and geographical difference of endolithic bacterial communities in I. palifera. To the best of our knowledge, this is the first study characterizing the role of endoliths in coral skeletons from an anaerobic point of view. It proved the ability of specific coral-associated endolithic microorganism to take up nitrogen, and further emphasizes the central, but often overlooked, role of the microbial communities in coral biology.