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

为阐明捕食者饱和假说对日本高原山高原山落叶混交林的适用性，在1公顷(100m×100m)的大型森林动态样地(100m×400m)和4ha样地附近的0.25ha样地上采集了两种山毛榉的凋落物，包括坚果和幼果。在这些地块中，从研究地点的两个山毛榉树冠上采集了预散布的山毛榉坚果(使用了这笔赠款支持的树梯)。我们新的假设是，捕食者饱和假说不适用于混合山毛榉森林，因为捕食者是常见的。在研究期间(2003-2005年)，日本扇贝在2005年获得了丰产，早熟坚果的昆虫比例下降。因此，新的假设被拒绝了。虽然捕食者对山毛榉坚果的捕食性是常见的，但两种山毛榉成熟期的差异等原因导致了两种山毛榉共同的捕食习性不同。通过对捕食性天敌入侵日本稻仁的观察，发现其发生在5月上旬

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