2010年夏沖縄島300水系における外来水生生物と在来魚の分布記録  [in Japanese] A distribution record of alien aquatic organisms and native fishes in 300 water systems on Okinawa Island in the summer of 2010  [in Japanese]

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Abstract

2010年6月22日から10月18日に沖縄島300水系において、延べ流程340kmを踏査し、外来水生生物31分類群と在来魚41分類群の分布を記録した。生物の確認は、主に川を歩いて遡りながらの目視観察で行われた。結果、外来水生生物の分布は、島の南部に多く、北東部で少なかった。カワスズメ属、グッピーおよびコイは順に141、120および54水系で確認された。セルフィンプレコ属やジルティラピア、アカミミガメなどは、人口密度の高い南部に分布が集中していた。一方、ダニオ属やプラティ、コウタイなどは、観賞魚であるが人口密度の低い北部でのみ記録された。絶滅危惧種をはじめ在来魚の分布は、北部と中西部に多かった。ソードテールは、北部での分布拡大が著しい外来魚であり、絶滅危惧種への影響も危惧される。

Between June 22 and October 18, 2010, 300 water systems on Okinawa Island covering a length of 340km were explored in order to record the distribution of 31 taxa of alien aquatic organisms and 41 taxa of native fish. They were confirmed mainly by visual observation while walking up the river on foot. The alien aquatic organisms were distributed mainly in the southern part of the island, although a few were seen in the northeastern part of the island. The tilapia (Oreochromis spp.), guppy, and carp were found in 141, 120, and 54 water systems, respectively. The sailfin catfish, redbelly tilapia, and red-eared slider turtle were distributed mostly in the southern part of the island, which has a high human population density. Ornamental fish such as the danio, platy, and small snakehead were found only in the northern part of the island, which has a low human population density. Endangered species and native fish were found mainly in the northern and central-western parts of the island. The swordtail is an alien fish that has an extensive distribution in the northern part of the island, and it is feared that it might influence some endangered species.

Journal

  • Japanese journal of conservation ecology   [List of Volumes]

    Japanese journal of conservation ecology 16(1), 99-110, 2011-05-30  [Table of Contents]

    The Ecological Society of Japan

References:  16

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Codes

  • NII Article ID (NAID)
    110008661341
  • NII NACSIS-CAT ID (NCID)
    AA11857952
  • Text Lang
    JPN
  • Article Type
    NOT
  • ISSN
    13424327
  • NDL Article ID
    11145463
  • NDL Source Classification
    ZR1(科学技術--生物学)
  • NDL Call No.
    Z18-B498
  • Data Source
    CJP  NDL  NII-ELS 
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