Lethal limits of high temperature for two crayfishes, the native species Cambaroides japonicus and the alien species Pacifastacus leniusculus in Japan

Authors

  • KAZUYOSHI NAKATA,

    Corresponding author
    1. Department of Applied Aquabiology, National Fisheries University, Shimonoseki, Yamaguchi 759-6595 and
    Search for more papers by this author
    • a Laboratory of Marine Biodiversity, Graduate School of Fisheries Science, Hokkaido University, Hakodate 041-8611, Japan.

  • TATSUO HAMANO,

    1. Department of Applied Aquabiology, National Fisheries University, Shimonoseki, Yamaguchi 759-6595 and
    Search for more papers by this author
  • KEN-ICHI HAYASHI,

    1. Department of Applied Aquabiology, National Fisheries University, Shimonoseki, Yamaguchi 759-6595 and
    Search for more papers by this author
  • TADASHI KAWAI

    1. Hokkaido Nuclear Energy Environmental Research Center, Kyowa, Hokkaido 045-0123, Japan
    Search for more papers by this author

*Corresponding author: Fax: 81-138-40-5548. Email: nakata@fish.hokudai.ac.jp

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.

Ancillary