Distribution of the Japanese crayfish (<i>Cambaroides japonicus</i>) and signal crayfish (<i>Pacifastacus leniusculus</i>), in the Kushiro District of Eastern Hokkaido, Japan : New challenge by high school students

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  • 北海道東部釧路地方におけるニホンザリガニ<i>Cambaroides japonicus</i>とウチダザリガニ<i>Pacifastacus leniusculus</i>の分布 : 高校生による調査事例
  • 北海道東部釧路地方におけるニホンザリガニCambaroides japonicusとウチダザリガニPacifastacus leniusculusの分布--高校生による調査事例
  • ホッカイドウ トウブ クシロ チホウ ニ オケル ニホンザリガニ Cambaroides japonicus ト ウチダザリガニ Pacifastacus leniusculus ノ ブンプ コウコウセイ ニ ヨル チョウサ ジレイ

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Abstract

From 31 July 2003 to 26 July 2007, we investigated the distribution of the endemic Japanese crayfish Cambaroides japonicus and the introduced signal crayfish Pacifastacus leniusculus in the Kushiro District of Eastern Hokkaido, Japan. We collected C. japonicus and P. leniusculus at six sites, C. japonicus only at seven sites, and P. leniusculus only at one site. At five sites where only C. japonicus was collected and at five sites where both species were collected, we determined the lowest position where C. japonicus was collected. At the sites where only C. japonicus was collected, it was collected in the headwaters and in the lower reaches, but at the sites where P. leniusculus was collected C. japonicus was collected only in the headwaters. At ten sites where C. japonicus was collected and at ten sites where P. leniusculus was or had been collected, we measured the pH and concentrations of dissolved oxygen (DO), chemical oxygen demand (COD), NH_4^+-N, NO_3^--N, and PO_4^<3->-p using BTB test paper, pH-indicator paper, and an ion selective pack test. No differences were observed in the values measured at the collection sites of the two species. This study was carried out by five high school students under the tutelage of a teacher.

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