First evidence of genetic connectivity of the brooder coral Pocillopora damicornis in the Gulf of Thailand

Authors

  • Makamas - Sutthacheep Ramkhamhaeng Univerity
  • Yuichi Nakajima
  • Kazuhiko Sakai
  • Thamasak Yeemin
  • Sittiporn Pengsakun
  • Wanlaya Klinthong
  • Charernmee Chamchoy
  • Watchara Samsuvan

Keywords:

population genetics, Pocillopora, connectivity, microsatellite, Gulf of Thailand

Abstract

Although the population genetics of corals have been intensively studied, the knowledge of population boundaries, source-sink dynamics, and highly variable population genetic structures in scleractinian corals in Thailand is considerably limited. In this study, we aim to examine population genetic patterns for the coral Pocillopora damicornis from several locations in the Gulf of Thailand. The samples were extracted and genotyped using six microsatellite loci to analyze the genetic structure of P. damicornis populations. Based on the analyses, a total of 214 complete multilocus genotypes from 241 coral fragments of P. damicornis were yielded with the mean Ho and He values for all loci across sites of 0.810±0.060 (±SD) and 0.630±0.038 (±SD), respectively. A significant difference was detected among populations (p < 0.001). The highest FST values were found between Ko Khang Khao samples (the Inner Gulf of Thailand) and Ao Thien, Ko Tao samples (the Western Gulf of Thailand), whereas the lowest value was found between Ko Thalu (northwest, the Western Gulf of Thailand) samples and Ko Klung Badan (the Inner Gulf of Thailand) samples. Principle coordinate analysis (PCA) based on FST values revealed that genetic connectivity was not associated with the geographic location and distance between sites. The results from this study are useful for further exploring the connectivity and genetic diversity of Pocillopora populations, and will also support coral reef conservation in Thailand.

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2021-12-31

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