RAPD解析によるダム上下流の河川水生昆虫3種地域集団の遺伝的多様性の評価  [in Japanese] GENETIC DIVERSITY ASSESSMENT BASED ON RAPD ANALYSIS FOR 3 SPECIES AQUATIC INSECTS IN STREAMS FRAGMENTED BY RESERVOIRS  [in Japanese]

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Abstract

ダム湖は河川水生昆虫の幼虫と成虫の移動を阻害し,ダム上下流間の遺伝的分化やそれに伴う遺伝的多様性の低下を引き起こす恐れがある.本研究は湛水面積が異なる複数のダム湖周辺でヒゲナガカワトビケラ,ウルマーシマトビケラ,クロマダラカゲロウの3種の水生昆虫地域集団のRAPD解析を行った.解析の結果,ヒゲナガカワトビケラの遺伝的分化は6つのダム湖のうち湛水面積が 3.27 km<sup>2</sup> 以上の2つの大きなダム湖で遺伝的に分化していたが,ウルマーシマトビケラは湛水面積が小さい場合でも分化することがあった.また,ウルマーシマトビケラの遺伝的多様性の低下要因として,集団サイズの低下とダムによる生息地分断化の2因子が働くが,残り2種は集団サイズの低下のみが主に働いていることが明らかになった.

Based on RAPD, the genetic structures of <i>Stenopsyche marmorata, Hydropsyche orientalis</i>, and <i>Ephemerella nigra</i> populations found above and below reservoirs with various water surface areas were investigated. The results of the genetic distance showed that amongst the six reservoirs, the genetic differentiations of <i>H. orientalis</i> were found in the third smallest and in the largest reservoirs while those of <i>S. marmorata</i> were shown in the two largest reservoirs. The size of reservoir influenced the genetic differentiations for <i>S. marmorata</i>, but did not for <i>H. orientalis</i>. The expected heterosygosity indicated that genetic diversities of <i>H. orientalis</i> were constrained by both effects of habitat fragmentation and population size while the rest of the species were constrained only by the latter's effect.

Journal

  • Doboku Gakkai Ronbunshuu G

    Doboku Gakkai Ronbunshuu G 62(1), 94-104, 2006-04-20

    Japan Society of Civil Engineers

References:  41

Codes

  • NII Article ID (NAID)
    10019320954
  • NII NACSIS-CAT ID (NCID)
    AA12131726
  • Text Lang
    JPN
  • Article Type
    REV
  • Data Source
    CJP  J-STAGE 
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