Homogeneous population of the brown alga sargassum polycystum in Southeast Asia: Possible role of recent expansion and asexual propagation

Sze Wai CHAN, Chi Chiu CHEANG, Anong CHIRAPART, Grevo GERUNG, Chea THARITH, Put ANG

Research output: Contribution to journalArticles

22 Citations (Scopus)

Abstract

Southeast Asia has been known as one of the biodiversity hotspots in the world. Repeated glacial cycles during Pleistocene were believed to cause isolation of marine taxa in refugia, resulting in diversification among lineages. Recently, ocean current was also found to be another factor affecting gene flow by restricting larval dispersal in animals. Macroalgae are unique in having mode of reproduction that differs from that of animals. Our study on the phylogeographical pattern of the brown macroalga Sargassum polycystum using nuclear Internal Transcribed Spacer 2 (ITS2), plastidal RuBisCO spacer (Rub spacer) and mitochondrial cytochrome oxidase subunit-III (Cox3) as molecular markers revealed genetic homogeneity across 27 sites in Southeast Asia and western Pacific, in sharp contrast to that revealed from most animal studies. Our data suggested that S. polycystum persisted in single refugium during Pleistocene in a panmixia pattern. Expansion occurred more recently after the Last Glacial Maximum and recolonization of the newly flooded Sunda Shelf could have involved asexual propagation of the species. High dispersal ability through floating fronds carrying developing germlings may also contribute to the low genetic diversity of the species. Copyright © 2013 chan et al.
Original languageEnglish
Article numbere77662
JournalPLoS One
Volume8
Issue number10
DOIs
Publication statusPublished - Oct 2013

Citation

Chan, S. W., Cheang, C. C., Chirapart, A., Gerung, G., Tharith, C., & Ang, P. (2013). Homogeneous population of the brown alga sargassum polycystum in Southeast Asia: Possible role of recent expansion and asexual propagation. PLoS One, 8(10). Retrieved from https://doi.org/10.1371/journal.pone.0077662

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