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DISSERTATION RESEARCH: Effect of Forest Fragmentation on Seed Dispersal and Forest Regeneration in the Central Amazon

论文研究：森林破碎化对亚马逊中部种子传播和森林再生的影响

基本信息

批准号：
0508688
负责人：
Henry Howe
金额：
$ 1.2万
依托单位：
University of Illinois at Chicago
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2005
资助国家：
美国
起止时间：
2005-07-01 至 2007-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0508688&HistoricalAwards=false
关键词：
DISSERTATION RESEARCH Effect Forest Fragmentation

项目摘要

The effects of forest fragmentation on seed dispersal and neotropical forest regeneration are poorly understood. Research in the Amazon has shown that potential seed dispersers (primates, understory frugivorous birds, and bats) have lower densities in forest fragments compared to continuous forest. In contrast, potential seed predators (terrestrial small mammals) are more diverse and abundant in fragments. These studies suggest that seed dispersal may be lower, and seed predation higher in small fragments, however no studies have tested this. The proposed project will be the first to assess the effect of forest fragmentation on tree regeneration dynamics in the central Amazon and quantitatively relate these effects to modifications in plant-animal interactions that are hypothesized to influence tree regeneration. We will quantify tree seedling species richness and composition in forest fragments (1, 10, and 100 ha) and continuous forest. We will simultaneously measure seed rain, seed predation, and herbivory. We will test the hypothesis that forest fragmentation negatively affects forest regeneration through losses in frugivores and simultaneously test the alternate hypotheses that seed predation, herbivory, or edge effects negatively impact upon biodiversity and composition of tree regeneration. The discovery and measurement of dispersal limitation of forest regeneration will have major implications for land management in the neotropics, as it will contribute to estimates of the minimum fragment size and the maximum fragment isolation that can allow sustained regeneration. The research will also identify links between seed dispersers, predators, and fragment size that can be used in predictive models to determine the effects of land use practices on native forest species.

森林片断化对种子传播和新热带森林更新的影响知之甚少。亚马逊地区的研究表明，潜在的种子传播者（灵长类动物、林下食果鸟类和蝙蝠）在森林碎片中的密度低于连续森林。相比之下，潜在的种子捕食者（陆生小型哺乳动物）更多样化，更丰富的片段。这些研究表明，种子传播可能较低，种子捕食较高的小片段，但没有研究已经测试。拟议的项目将是第一个评估森林破碎化对亚马逊中部树木再生动态的影响，并将这些影响与假设影响树木再生的植物-动物相互作用的修改定量联系起来。我们将量化树苗物种丰富度和组成的森林片段（1，10，100公顷）和连续森林。我们将同时测量种子雨，种子捕食和草食动物。我们将测试的假设，森林破碎化的负面影响森林再生，通过在食果动物的损失，同时测试的替代假设，种子捕食，草食动物，或边缘效应对生物多样性和组成的树木再生的负面影响。森林更新的扩散限制的发现和测量将有重大影响的土地管理在新热带地区，因为它将有助于估计的最小片段大小和最大片段隔离，可以允许持续的再生。该研究还将确定种子传播者，捕食者和碎片大小之间的联系，这些联系可用于预测模型，以确定土地利用做法对本地森林物种的影响。