Genetic Structure of Loach Population in Yatsu Paddy Field

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  • 谷津田域におけるドジョウ集団の遺伝的構造の解明
  • 谷津田域におけるドジョウ集団の遺伝的構造の解明--マイクロサテライトDNAを利用した千葉県下田川流域の事例
  • ヤツ デンイキ ニ オケル ドジョウ シュウダン ノ イデンテキ コウゾウ ノ カイメイ マイクロサテライト DNA オ リヨウ シタ チバ ケン シタダ ガワ リュウイキ ノ ジレイ
  • —マイクロサテライトDNAを利用した千葉県下田川流域の事例—
  • —A case study of the Shitada River basin in Chiba Prefecture using microsatellite DNA—

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Abstract

Using repeated sequences of microsatellite DNA, we investigated genetic variation and spatial structure of the loach Misgurnus anguillicaudatus population in drainage canals including a main stream in the Shitada River basin composed of Yatsu paddy fields, Chiba Prefecture. Loach population samples of nine to 48 individuals were collected from 54 sampling sites in eight canals and the main stream, and genotype data in eight microsatellite loci were obtained for each sample in the genetic analysis. The average number of alleles per locus was 3.9 to 9.0, and the average observed and expected heterozygosities were 0.444-0.647 and 0.463-0.628, respectively, across samples. All samples seemed to be random mating, which conformed to the Hardy-Weinberg equilibrium. Values of the fixation index FST, were estimated to range between 0-0.161 among all samples, and a part of these values were significant. The pattern of genetic differentiation between samples with principal component analysis indicated that samples in three distinct canals appeared to differentiate, suggesting that the genetic spatial structure of the loach population in Yatsu paddy fields must be complex.

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