長野県野辺山高原のアズマヒキガエルの体の大きさと個体群密度 Body Size and Population Density of <i>Bufo japonicus formosus</i> from Nobeyama Highland, Nagano

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Abstract

1994年と1995年に長野県野辺山高原(標高1350m)のアズマヒキガエルの個体群について調査した.繁殖期は4月下旬から5月初旬で,夏の活動期は5月下旬から9月下旬であった.ヒキガエルの全調査期間の平均頭胴長は雄で94.2mm(N=77,SD=8.2)であり,雌で95.5mm(N=69,SD=8.0)であった.頭胴長は低地のヒキガエルよりも小さかった.また,全調査期間の平均体重は雄で103g(N=76,SD=25.9),雌で104g(N=57,SD=29.1)だった.年内の再捕率は雄0.333,雌0.320であり,雌雄間で有意差はなかった.Petersen法により推定された個体群密度は5.9/haで,信頼区間(95%)は3.9-8.0/haだった.

A population of the toad, <i>Bufo japonicus formosus</i>, was studied in Nobeyama Highland (altitude 1350m), Nagano in 1994 and 1995. Breeding activity of the toad occurred from late April through early May, and their summer activity was observed from late May through late September. The mean snout-vent length (SVL) was 94.2mm (N=77, SD=8.2) in males and 95.5mm (N=69, SD=8.0) in females. The SVLs were smaller than those from lowlands. The mean body mass was 103g (N=76, SD=25.9) in males and 104g (N=57, SD=29.1) in females. The rate of recapture within a year was 0.333 in males and 0.320 in females, and there was no significant difference between the sexes. Population density estimated by Petersen's method was 5.9/ha, and the confidence interval (95%) was 3.9-8.0/ha.

Journal

  • Current Herpetology

    Current Herpetology 16(3), 108-113, 1996

    The Herpetological Society of Japan

Codes

  • NII Article ID (NAID)
    130004980749
  • NII NACSIS-CAT ID (NCID)
    AN00205135
  • Text Lang
    UNK
  • ISSN
    0285-3191
  • NDL Article ID
    3986872
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z18-16
  • Data Source
    NDL  J-STAGE 
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