Peripatric differentiation among adjacent marine lake and lagoon populations of a coastal fish, Sphaeramia orbicularis (Apogonidae, Perciformes, Teleostei)

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概要

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• The effect of geographical isolation on speciation, particularly within short geographical ranges, is poorly understood among marine organisms. Focusing on marine lakes of the Palau Islands, we investigated the effect of geographical isolation on Sphaeramia orbicularis, a coastal fish inhabiting marine lakes and lagoons. We collected a total of 157 individuals from three meromictic marine lakes and three lagoon sites, and analyzed the genetic diversity and differentiation of the populations based on complete sequences of the mitochondrial control region (824 bp). The analyses show that the genetic diversity of marine lake populations is much lower than that of lagoon populations. Moreover, a mismatch distribution analysis suggests that marine lake populations have experienced a decrease followed by a rapid expansion of their population size. These results reveal that marine lake populations have experienced severe founder and/or bottleneck events during the last thousand to tens of thousand years. Pairwise ΦST values ranged from 0.531 to 0.848 between marine lake and lagoon populations and from 0.429 to 0.870 among marine lake populations, indicating a high degree of genetic differentiation. We speculate that such peripatric differentiation between marine lake and lagoon populations was caused by a small number of individuals colonizing the lakes from the lagoon (founder event) followed by repetitive bottleneck events, such as those generated by the El Niño-Southern Oscillation (ENSO). So far, such high genetic divergences in extremely short geographical ranges (approximately 150–250 m) have scarcely been reported for marine organisms. We suggest that the marine lake is one of the good model of geographical isolation in marine organisms and each marine lake population is in the early stages of speciation.

• 日本遺伝学会の論文
• 2009-08-25

著者

• CHIBA Satoru

  Graduate school of Science and Engineering, Yamagata University

• HANZAWA Naoto

  Graduate school of Science and Engineering, Yamagata University

• Chiba Satoru

  Graduate School Of Sci. And Engineering Yamagata Univ.

• Gotoh Ryo

  Graduate School Of Science And Engineering Yamagata University

• Hanzawa Naoto

  Graduate School Of Sci. And Engineering Yamagata Univ.

• SEKIMOTO Hidekatsu

  Graduate School of Science and Engineering, Yamagata University

• Sekimoto Hidekatsu

  Graduate School Of Science And Engineering Yamagata University

• Gotoh Ryo

  Graduate School Of Sci. And Engineering Yamagata Univ.

関連論文

• Comprehensive phylogeny of the family Sparidae (Perciformes : Teleostei) inferred from mitochondrial gene analyses
• Genetic divergence and phylogenetic independence of Far Eastern species in subfamily Leuciscinae (Pisces : Cyprinidae) inferred from mitochondrial DNA analyses
• Peripatric differentiation among adjacent marine lake and lagoon populations of a coastal fish, Sphaeramia orbicularis (Apogonidae, Perciformes, Teleostei)
• Phylogenetic characterization of three morphs of mussels (Bivalvia, Mytilidae) inhabiting isolated marine environments in Palau Islands
• Population genetic structure of the striped silverside, Atherinomorus endrachtensis (Atherinidae, Atheriniformes, Teleostei), inhabiting marine lakes and adjacent lagoons in Palau : marine lakes are "Islands" for marine species

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