SpringerImages - Distribution of the Japanese squirrel, Sciurus lis (hatched area) and the 11 locations at which seeds of the Japanese walnut, Juglans ailanthifolia, were collected for comparisons of seed size. The squirrel is distributed in only a part of Honshu and Shikoku. In contrast, the Japanese field mouse, Apodemus speciosus, is commonly distributed at all collection locations, including on two small islands. 1 Aomori, 2 Akita, 3 Sado Island, 4 Niigata, 5 Nagano, 6 Tokyo, 7 Fukui, 8 Oki Island, 9 Tottori, 10 Tokushima on Shikoku, 11 Kumamoto on Kyushu. Numerals indicate latitude (°N) and longitude (°E)

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Fig 1

Distribution of the Japanese squirrel, Sciurus lis (hatched area) and the 11 locations at which seeds of the Japanese walnut, Juglans ailanthifolia, were collected for comparisons of seed size. The squirrel is distributed in only a part of Honshu and Shikoku. In contrast, the Japanese field mouse, Apodemus speciosus, is commonly distributed at all collection locations, including on two small islands. 1 Aomori, 2 Akita, 3 Sado Island, 4 Niigata, 5 Nagano, 6 Tokyo, 7 Fukui, 8 Oki Island, 9 Tottori, 10 Tokushima on Shikoku, 11 Kumamoto on Kyushu. Numerals indicate latitude (°N) and longitude (°E)

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lis is restricted to more northern areas and is absent on small islands (Fig. 1 ).

We compared walnut seed size at 11 localities (Fig. 1 ).

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