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

山毛榉食草动物的捕食者饱足假说是否适用于日本太平洋沿岸的日本山毛榉（Fagus japonica）和西博尔德山毛榉（Fagus crenata）混合落叶林

• 批准号: 15580120
• 负责人: OHKUBO Tatsuhiro
• 金额: $ 1.34万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15580120/
• 关键词: Japanese Beech (Fagus japonica); Siebold's Beech (Fagus crenata); Masting of Seed Production; Hervibivor; Mt.Takahara, Tochigi; Canopy Observation Ladder; 林冠観測用梯子

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

为了阐明捕食者饱足假说对日本山毛榉的适用性，（日本山毛榉）和西博尔德山毛榉（Fagus crenata）日本太平洋一侧的栃木县高原山山麓的落叶混交林，在1公顷样地上设置凋落物收集器，收集两种山毛榉的凋落物，包括坚果和壳斗（100 m x 100 m）的大规模森林动态样地（100 m x 400 m）以及在研究期间4 ha样地附近的0.25 ha样地。在这些地块中，还从研究地点的两个山毛榉树冠中收集了分散前的山毛榉坚果（使用该赠款支持的树梯）。我们新假设，捕食者饱和假说不适用于混交林，因为捕食者是常见的。2003-2005年研究期间，2005年是日本赤眼蜂的盛年，昆虫捕食坚果的比例有所下降。所以，新的假设被否定了。虽然山毛榉坚果的捕食性天敌很常见，但由于两种山毛榉成熟期的不同及其它原因，导致两种山毛榉坚果的捕食性天敌的共同习性不同。从捕食性天敌对核桃的入侵观察中发现，核桃的捕食性天敌入侵发生在5月初，

项目成果

Tomokazu Takahashi^1, Akihiro Konuma^<1, 4>, Tatsuhiro Ohkubo^2, Hideaki Taira^1, Y: "Comparison of spatial genetic structures in Fagus crenata and F. japonica by the use of microsatellite markers"Silvae Genetica. (In press). (2004)

Tomokazu Takahashi^1、Akihiro Konuma^<1, 4>、Tatsuhiro Ohkubo^2、Hideaki Taira^1、Y：“利用微卫星标记比较水青冈和日本水青冈的空间遗传结构”Silvae Genetica。

ブナの虫は熊の敵?

山毛榉昆虫是熊的天敌吗？

• 发表时间: 2005
• 期刊: はくさん 第32巻第3号
• 作者: 鎌田直人;小谷二郎
• 通讯作者: 小谷二郎

ブナ林の虫はクマの敵?

山毛榉林昆虫是熊的天敌吗？

• 发表时间: 2005
• 期刊: 手取川読本(出版元「手取川エコミュージアム構想プロジェクトチーム」) 印刷中
• 作者: 鎌田直人;小谷二郎;鎌田直人
• 通讯作者: 鎌田直人