ヒキガエルの産卵出動の地温による予測

概要

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The effect of underground temperature on the spring emergence of the toad, Bufo bufo formosus, was observed at four breeding spots : Maruko (640 m above sea level), Obuse (360 m), Misuzuko (1000 m), and Sanshiro (1100 m), in Nagano Prefecture. Toads breed immediately after their emergence, which occurs throughout the period from middle April into early May. Soil temperatures around the breeding spots, where the toads seem to hibernate, were measured from late March to early May in the years 1977-1979. It was found that initiation of emergence in each breeding spot was influenced by the underground temperature, i.e., emergence occurred when the soil temperature at a depth of 20 cm rose more than 8.3℃(Maruko), 9.4℃(Obuse), 6.6℃(Misuzuko), and 6.6℃(Sanshiro). It is not certain whether or not the emergence of the toads is influenced directly by the soil temperature at a depth of 20 cm. However, the underground temperature at this depth seems to be a good indicator for estimating the time of spring emergence of the toad.
社団法人日本動物学会の論文
1981-06-25