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Vertical and Horizontal Distributions of Oeneis norna asamana (Nymphalidae: Satyrinae) in the Hida Mountain Chain (the Northern Japan Alps) in Japan

ABSTRACT. 
 Vertical and horizontal distributions of Oeneis norna have been investigated at the Hida mountain chain (Northern Japan Alps) in Japan. It is shown that the lower limit of the vertical distribution tends to decrease from the south to north. Linearity is seen between the lower and upper limits of the vertical distribution. The range of vertical distribution tends to narrow with lowering the upper altitudinal limit of the habitat. It is inferred from the horizontal distribution pattern of Oeneis norna in this area that the tephra (Tt-D) derived from the volcano of Mt. Tateyama and accumulated about 105 years ago, had an influence on the present distribution of this species in the Hida mountain chain.