小動物による重力落下後のトチノキ種子の運搬
Removal of fallen Aesculus turbinata seeds by small mammals

Hisamichi ISAJI, Hisashi SUGITA
1997 Nihon Seitai Gakkaishi  
The removal of fallen seeds of . 4esculus tuハbinata was investigated by simple Inarking methods . In order to clarif ン the agent animals , an experiment was carried out to examine the sizes of the animals using a set of nettod cages with different − sized apertures , together with wood mouse censuses . Current − year seedlings were fbund on the upper part ofthe slopes than the upper 丘 ont line ofthe crowns of . 4. turbinata , where no sceds had fallen in the previous autumn , Of the total
more » ... Of the total fallen seeds , 96% were removed from their original location and then disappeared by the end of autumn . Line marking revea 五 ed that the mean interval fbr transportation was I2 days , and that the mean and maximum transportation distances fbr non − missing seeds were O . 61 m and 2. llm , respectiveiy , although the lines of most of marked seeds had been cut and the seeds were missing . The maXimum distance from the original location to the missing point was 6 . 45 m , and seeds were buried in cases of 315 % of transportation . The agent animals were assumed to be small enough to aUow them to pass through as aperture size ofless than 40 mm but more than 16mm . Feeding signs on seeds , and droppings fbund around seeds , seemed to be those ofwood mice . The mouse ccnsuses showed that Apodemus s ρ eciosus and . 4. argen 彪 us were dominant. Thus, it is concluded that 飴 llen seeds of . 4. turbinata were transported through the scatter − hoarding behavior of wood Inice , mainly A . speciOSUS .
doi:10.18960/seitai.47.2_121 fatcat:vhec7ruz45el3jpjrdqge7yoei