滋賀県湖南地域における魚類の分布パターンと地形との関係  [in Japanese] Relationship between fish distribution pattern and geomorphology in the Konan area surrounding the southern part of Lake Biwa.  [in Japanese]

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Abstract

1998年3月から2000年11月にかけて,琵琶湖南湖周辺の10市町村の琵琶湖岸,内湖,河川,水路,池など879地点を調査し,16科42属55種(亜種を含む)の魚類を採集した。オイカワ,カワムツA型,カワムツB型,タモロコ,カマツカ,ギンブナ,アユ,トウヨシノボリなどの在来種は多くの調査地点に分布していた。一方,外来種のブルーギルやオオクチバスも多くの調査地点で採集された。分布パターンを魚種で分類するためにクラスター分析を行った結果,AからDの4つのクラスターが不明瞭ながら認められ,分布パターンと地形との間に関係が認められた。オイカワやカマツカに代表されるクラスターAとタイリクバラタナゴやメダカに代表されるクラスターBの多くは,デルタ帯,扇状地帯に広く分布するが,カワムツA型やタモロコに代表されるクラスターBの一部はデルタ帯に分布しない。その一方で,カワムツB型に代表されるクラスターCは丘陵地に分布し,ブルーギル(クラスターD)はデルタ帯に分布していた。タモロコやカワムツA型などクラスターBの一部の魚種はブルーギルの影響を強く受けているものと思われた。

Fish distributions were surveyed in the Konan area surrounding the southern part of Lake Biwa from March 1998 to November 2000. From 879 localities, fishes of 16 families, 42 genera, and 55 species or subspecies were collected. Native fishes such as Zacco platypus, Zacco sp., Zacco temmincki, Gnathopogon elongatus elongates, Pseudogobio e. esocinus, Carassisus auratus langsdorfii, Plecoglossus altiuelis altivelis, and Rhinogobius sp. were collected at many localities confirming that they were widely distributed. The introduced fishes Lepomis macrochirus and Micropterus salmoides were also found in a large number of localities. The distribution patterns of individual species are related to geomorphology. The A-type pattern is represented by Zacco platypus, which is distributed in both delta and alluvial fan areas. The B-type pattern is represented by Zacco sp. and Gnathopogon e. elongatus, which are distributed only in the alluvial fan area. The C-type pattern is represented by Zacco ternmincki, which is distributed in hilly areas. The D-type pattern is represented by Lepomis macrochirus and Micropterus salmoides, which are restricted to the delta area. The fishes that exhibit the B-type pattern were originally distributed in both the delta and alluvial fan areas, but they seem to have retreated from the delta area following the introduction of Lepomis macrochirus and Micropterus salmoides.

Journal

  • Japanese Journal of Limnology (Rikusuigaku Zasshi)

    Japanese Journal of Limnology (Rikusuigaku Zasshi) 62(3), 261-270, 2001

    The Japanese Society of Limnology

Codes

  • NII Article ID (NAID)
    130003442250
  • Text Lang
    JPN
  • ISSN
    0021-5104
  • Data Source
    J-STAGE 
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