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Internal and external appearance of a shelter cage used for cage protection of Japanese rock ptarmigan broods on Mt. Norikuradake (A and B, respectively) with location numbers to indicate the soil sample collection positions within the cages (C). OPG values for the soil samples within the cages at Mt. Norikuradake (D; E. uekii and E; E. raichoi) and Mt. Komagatake (F; E. uekii and G; E. raichoi).
