Lethal limits of high temperature for two crayfishes, the native species Cambaroides japonicus and the alien species Pacifastacus leniusculus in Japan |
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| Authors: | KAZUYOSHI NAKATA a TATSUO HAMANO KEN-ICHI HAYASHI TADASHI KAWAI |
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| Institution: | ;Department of Applied Aquabiology, National Fisheries University, Shimonoseki, Yamaguchi 759-6595 and ;Hokkaido Nuclear Energy Environmental Research Center, Kyowa, Hokkaido 045-0123, Japan |
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| Abstract: | ABSTRACT: Lethal limits of high temperature were studied to clarify the effects on the survival of the endangered Japanese crayfish species Cambaroides japonicus and the alien species Pacifastacus leniusculus . After the acclimation period for 2 weeks at 16°C, the temperature was raised at a rate of 1°C per week. As a result, the ultimate upper lethal temperatures of C. japonicus and P. leniusculus were 27.0 and 31.1°C, respectively, and the lethal temperature for P. leniusculus was significantly higher than for C. japonicus . The natural distributions of these two species are discussed in terms of the temperature tolerance. |
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| Keywords: | Cambaroides japonicus crayfish distribution lethal temperature Pacifastacus leniusculus tolerance |
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