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Function of pollination network in a cool-temperate deciduous broad-leaved forest

寒温带落叶阔叶林授粉网络的功能

基本信息

批准号：
11440223
负责人：
TODA Masanori j.
金额：
$ 9.22万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

In order to examine the hypothesis that annual fluctuation of floral resources of canopy trees generates that of pollinator population, then that of reproductive success of understory plant, that shars the pollinator, flowering in later seasons, we investigated following three components :(1) Floral resource amount of entomophilous trees : we quantitatively assessed about twenty entomophilous trees including eight species frequently visited by bumblebees. Reproduction system of Fraxinus lanuginosa with high fluctuation in the number of flower was revealed. As for another masting tree Styrax obbasia, it was revealed that trasport of photosynthetic substrates from the non-reproductive shoot to reproductive shoot played an important role for determination of the number of flower by the tracing such substrates.(2) Abundance of bumblebees : In forest site the number of queens (estimated by mark-recapture method) and the number of workers correlated with the number of inflorescences of trees … More in the year and that in the previous year, respectively. Seasonal change in vertical distribution of bumblebees and trees implied that bumblebee change the flight height associated with the floral resource amount of canopy trees. From the seasonal patterns of workers in forest and open sites indicated that Bombus ardens showed similar seasonal patterns in both habitats while B. hypocrita tended to change main habitats between forest and open site. This suggest that B. hypocita could utilize more effectively the floral resource in open habitats for the population growth than B. ardens.(3) Reproductive success of an understory plant : Assessment of reproduction system and seed production of ten species of understory plants for four years documented the general patterns in the reproduction system of understory plants including Corydalis ambigua, a spring ephemeral herb pollinated by bumblebees. Then, relative influence of resource limitation and pollen limitation on seed set of understory plants by comparing seed set between places in different light condition, understory and forest margin.These studies quantitatively assessed annual fluctuation of pollination system in temperate forest for the first time, and our hypothesis was supported in general. These suggest that long-term monitoring of reproduction of flower and pollinator abundance is essential to assess the dynamic aspects of pollination system. Less

为了验证冠层植物花资源的年变化影响传粉昆虫种群的年变化，进而影响林下植物繁殖成功率的假说，本研究从以下三个方面进行了调查：（1）虫媒植物花资源量：对熊蜂经常光顾的8个种共20种虫媒植物的花资源量进行了定量分析。揭示了花量波动较大的白蜡繁殖系统。对另一种主枝树种野茉莉（Styraxobbasia），通过对光合物质的追踪，揭示了光合物质从非生殖枝向生殖枝的转运对花数的确定起着重要作用。(2)熊蜂的繁殖：在林下，用标记-再捕获法估计的蚁后数和工蜂数与树的花序数相关 ...更多信息年和上一年分别。熊蜂和树木垂直分布的季节变化表明，熊蜂改变了与树冠树木花资源量相关的飞行高度。结果表明，熊蜂在两种生境中的季节变化规律相似，而B.小腹蛛的主要栖息地倾向于在森林和开阔地之间转换。这表明B. hypocita比B能更有效地利用开放生境中的植物资源促进种群增长。阿登(3)林下植物的繁殖成功：对10种林下植物的繁殖系统和种子生产进行了为期4年的评估，记录了林下植物繁殖系统的一般模式，包括由熊蜂授粉的春季短命草本植物Corpus ambigua。通过比较不同光照条件下、林下和林缘的结实率，分析了资源限制和花粉限制对林下植物结实率的相对影响，首次定量评价了温带森林授粉系统的年波动，基本支持了我们的假设。这些表明，长期监测花的繁殖和传粉者的丰度对于评估传粉系统的动态方面至关重要。少