Fluctuation in Abundance and Age Structure of a Breeding Population of the Japanese Brown Frog, Rana japonica Gunther (Amphibia, Anura)(Ecology)

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概要

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• A breeding population of Rana japonica was studied at a marsh on the campus of Hiroshima University in Higashi-Hiroshima during the five years 1995-1999. The mark-recapture study showed that the size of the breeding population varied from year to year, and increased more than twofold in 1999 in comparison with the preceding years. The sex ratio of the breeding population (male/female) was from nearly 1.0 to 1.6. Frogs of both sexes were estimated to breed for the first time at the age of one or two years, and their maximum age was four years according to skeletochronology using phalanges and markrecapture. Modes of the estimated ages were one year for males during the study years except 1997, but one or two years for females. Two thirds of breeding frogs, irrespective of their sex, were estimated to breed only once throughout their lives.

• 社団法人日本動物学会の論文
• 2002-03-25

著者

• UEDA Hiroaki

  Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University

• Ueda H

  Optics Technology Division Takatsuki Laboratory Minolta Co. Ltd.

• Ueda Hiroaki

  Laboratory For Amphibian Biology Faculty Of Science Hiroshima University

• Ueda H

  Hiroshima City Univ. Hiroshima Jpn

• Marunouchi Junsuke

  Laboratory for Amphibian Biology, Graduate School of Science, Hiroshima University

• Kusano Tamotsu

  Department of Biology, Faculty of Science, Tokyo Metropolitan University

• Kusano Toshihisa

  Department Of Biology Faculty Of Science Tokyo Metropolitan University

• Marunouchi J

  Kanagawa Prefectural Museum Of Natural Histoty Odawara Jpn

• Ueda Hiroaki

  Laboratories Of Image Information Science And Technology

• KUSANO Tamotsu

  Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University

• Ueda Hiroaki

  Laboratories of Image Information Science and Technelogy, Osaka City University

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