Effect of habitat fragmentation by Dams and Intermittent River on Dispersal of Freshwater Insect <i>Epeorus latifolium</i>
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- YAEGASHI Sakiko
- Dept. of Civil and Environmental Engineering, Ehime University
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- FUWA Naoto
- Dept. of Civil and Environmental Engineering, Ehime University
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- YAMAZAKI Kumiko
- Dept. of Civil and Environmental Engineering, Ehime University
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- MIYAKE Yo
- Dept. of Civil and Environmental Engineering, Ehime University
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- WATANABE Kozo
- Dept. of Civil and Environmental Engineering, Ehime University
Bibliographic Information
- Other Title
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- ダムおよび瀬切れによる河川分断化がエルモンヒラタカゲロウの地域間交流に及ぼす影響の遺伝的評価
- ダム オヨビ セギレ ニ ヨル カセン ブンダンカ ガ エルモンヒラタカゲロウ ノ チイキ カン コウリュウ ニ オヨボス エイキョウ ノ イデンテキ ヒョウカ
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Abstract
We investigated gene flow of Epeorus latifolium in Shigenobu River (Ehime, Japan) fragmented by 3 types of barriers (i.e. one reservoir dam, 98 weir&check dam, intermittent flow). 112 individuals (13 - 15 individuals / population, average = 14) were collected from 8 populations and genotyped using Cytochrome Oxidase subunit I region in mitochondrial DNA. Among the 3 types of habitat barriers, the weir&check dams showed significant and the highest pairwise Fst between fragmented populations. In addition, the number of weir&check dams was significantly and positively correlated to the level of pairwise Fst (R = 0.81, p < 0.05), suggesting that gene flow of E. latifolium tends to be interrupted in sections with large number of weir&check dams (at least > 14). However, this genetic differentiation found in mountain area could be also explained by the potential process of local adaptation of the populations to the different environmental conditions associated to elevational variation between sites (e.g. water temperature, water flow velocity, UV, oxygen concentration). E. latifolium did not show significant genetic differentiation in the other barrier types of reservoir dam and intermittent flow. It suggests that E. latifolium adults fly over the small-size reservoir dam that we studied (< 0.5 km2) and have adapted life history strategy to migrate across the intermittent sections.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 71 (7), III_115-III_121, 2015
Japan Society of Civil Engineers
