Does predator satiation hypothesis by beech herbivore apply to Japanese beech (Fagus japonica) and Siebold's beech (Fagus crenata) mixed deciduous forests in the Pacific side of Japan

为了阐明捕食者饱食假说在日本太平洋侧枥木高原山麓混交林中的适用性，在研究期间，在大型森林动态样地（100m × 400m）的1公顷样地（100m × 100m）和4公顷样地附近的0.25公顷样地设置凋落物陷阱，收集了两种山毛榉的凋落物，包括坚果和小袋。在这些地块中，从研究地点的两个山毛榉树冠上收集了预分散的山毛榉坚果（使用了由该基金支持的树梯）。我们最近假设，捕食者饱和假说不适用于混合山毛榉林，因为捕食者很常见。研究期间（2003-2005年），2005年是粳稻的丰收年，虫蛀率下降。所以，新假设被否定了。虽然山毛榉坚果的捕食者是共同的，但两种山毛榉成熟期的差异等原因区分了两种山毛榉的共同捕食习性。从捕食者对粳稻果实的入侵观察中，我们发现它发生在5月初

In order to clarify the applicability of predator satiation hypothesis to Japanese beech (Fagus japonica) and Siebold's beech (Fagus crenata) mixed deciduous forests at foothill of Mt.Takahara, Tochigi, Pacific side of Japan, litterfall including nuts and cupules of two beech was collected from litter traps set on one hectare plot (100m x 100m) in a large scale forest dynamics plot (100m x 400m) and also 0.25 ha plot nearby the 4 ha plot for the study period. And also in these plot pre-dispersal beech nuts were collected from two beech canopies in the study site (tree ladder supported from this grant was used). And we newly hypothesized that the predator satiation hypothesis is not applied to the mixed beech forests because the predators are common. During the study period (2003-2005), F.japonica earned mast year in 2005, and the ratio of insect predated nuts decreased. So, the new hypothesis was rejected. Although the predators to beech nuts are common, the difference of maturing period of two beech and other reasons differenciate the common predator habit for the two beech species. From the observation of predator invasion to F.japonica nuts, we discovered that it occurred at the beginning of May