Fig 3
Relation between seed size [(shell length/2 × width/2 × depth/2) × 4π/3, mm3] of Japanese walnut trees at 11 locations and annual mean temperature. Locations within the distribution range of Japanese squirrels (populations 1, 2, 4, 5, 6, and 7) are indicated by dots. Locations in marginal regions (populations 9 and 10) and those outside of the squirrel’s distribution range (populations 3, 8, and 11) are indicated by triangles and crosses, respectively
The populations without or with only few squirrels as seed dispersers (crosses and triangles in Fig. 3 ) tended to have smaller seed sizes than the populations with squirrels (dots in Fig. 3 ).
Seed size at localities with squirrels tended to be larger than seed size at sites without or with only a few squirrels (Fig. 3 ).
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