Genetic Diversity of Symbiodiniaceae Associated with Porites lutea and Pocillopora damicornis in the Gulf of Thailand Inferred from Nucleotide Sequences of Internal Transcribed Spacer-2
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Abstract
Understanding the variation in Symbiotic algae-coral associations can provide insights about how corals respond to environmental changes. We examined community composition of family symbiodiniaceae in two scleractinian coral hosts, Porites lutea and Pocillopora damicornis at nine sites (n = 4-5 colonies/species/site) in the Gulf of Thailand (GoT). Species in the family Symbiodiniaceae were resolved from denaturing gradient gel electrophoresis and identified based on Internal Transcribed Spacer-2 (ITS2) DNA sequences. We observed five ITS2 haplotypes including those contained within Cladocopium goreaui (C1), Cladocopium spp. (C15, C15.7), Durusdinium glynnii (D1) and D. glynnii (D6). Cladocopium sp. (C15), was abundant and prevalent in Por. lutea. D. glynnii (D1) was prevalent in Poc. damicornis. PERMANOVA revealed the effects of host species and the site interactions on Symbiodiniaceae communities. The sampling sites contributed to the variation in Symbiodiniaceae species composition in Poc. damicornis (P<0.01), but not in Por. lutea. Cluster analysis suggested three large groups: (1) Por. lutea (dominated by Cladocopium sp. (C15), (2) Poc. damicornis (dominate by D. glynnii (D1)) and (3) minor group consisting of Poc. damicornis from SM with D. glynnii (D6). D. glynnii (D1) is likely to be widely distributes in the GoT while other is restricted in particular habitats. Despite multiple bleaching events in the GoT, our results suggest the persistence of spatial variation of Symbiodiniaceae communities and thus stress the importance of local adaptation of coral-symbiont partnerships.
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References
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