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The experimental population investigated by Ishibashi et al. (1998a) is located in the west-central part of Hokkaido, which belongs to the non-cyclic region with relatively mild winter (see Saitoh et al. 1998), as J. G. deduced.
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Gliwicz, J. Winter in Hokkaido. Res Popul Ecol 40, 135–136 (1998). https://doi.org/10.1007/BF02765230
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DOI: https://doi.org/10.1007/BF02765230