Ecological Studies of Bufo bufo japonicus SCHLEGEL : (V) The Relation between Appearances and the Climatic Conditions at Breeding Season

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Other Title
  • ヒキガエルの生態学的研究 (V) 繁殖期における出現と気象条件との関係について

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1. The present paper reports the relation between appearances of the Japanese common toad (Bufo bufo japonicus) and the climatic conditions at breeding season on the basis of the data from 1974 to 1977 in the National Park for Nature Study, Minato Ward, Tokyo. 2. Bufo bufo japonicus commences a breeding behavior during late February to early March every year. The breeding behavior is usually observed at night, however, several amplexed pairs are done even in the daytime at breeding sites where there are scarcely any human impact. 3. Toads were counted about 200 to 350 during a breeding season, but the number of appearances seems to underestimate as the investigations were carried out incompletely. In the breeding population, there is a ratio of about three males to one female. 4. Not a rainfall, but a rise in the minimum temperature is indicated to relate to the first date when toads appear at breedmg sites Particularly it is considered that toads have a tendency to appear when the minimum earth temperature in 5cm deep has risen above 6℃ approximately.

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Details 詳細情報について

  • CRID
    1573105976787014272
  • NII Article ID
    110004312818
  • NII Book ID
    AN00103849
  • ISSN
    0385759X
  • Text Lang
    ja
  • Data Source
    • CiNii Articles

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