ドウガネブイブイの生活環, 異なる標高環境下でのその適応に関する実験的検討

概要

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To analyze acclimation in Anomala cuprea to different thermal environments, populations from Sakurai (135°50′E ; 34°30′N ; alt. 50m), Nara Prefecture, Japan were reared at four altitudes on Mt. Hiei (135°50′E ; 35°3′N ; alt. 848m ; Kyoto Prefecture) : 120m, 300m, 580m and 820m. Results were compared with development estimates made using thermal constant and developmental zero, and estimated soil temperature. The seasonal developments of the populations corresponded well with the estimates. Populations that hibernated at the third instar in the first year had a univoltine life cycle, but those that hibernated at younger stages had a semivoltine life cycle regardless of altitude. It seems that the populations could be acclimated up to an altitude of 580m but not at 820m, because adult emergence was too late for reproduction. It is concluded that natural populations occurring above altitudes of 580m and latitudes above 38°N must have a different temperature response presenting diapause, or thermal constant and/or developmental zero. The polymorphic variation in life cycle and the quite wide distribution of scarabaeids is discussed based on the significance of mild soil temperature in winter.
日本応用動物昆虫学会の論文
1997-08-25