Effects of seed predators of different body size on seed mortality in Bornean logged forest.
Effects of seed predators of different body size on seed mortality in Bornean logged forest.
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DOI：
10.1371/journal.pone.0011651
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发表时间：
2010-07-19
期刊：
影响因子：
3.7
通讯作者：
Hector A
中科院分区：
文献类型：
--
作者：
Hautier Y;Saner P;Philipson C;Bagchi R;Ong RC;Hector A
詹森-康奈尔假说提出，种子和幼苗天敌在维持热带森林高水平的树木多样性方面发挥着重要作用。然而，人类干扰可能会改变种子捕食者的群体，包括它们的体型分布。这些变化有可能影响砍伐森林中幼苗的存活，并可能改变森林的组成和多样性。我们在砍伐的森林中控制了同种和异种成年树下的种子密度，并使用笼子排除了不同体型的脊椎动物捕食者。我们发现小型和大型捕食者对异种和异种幼苗死亡率的影响不同。小型和大型捕食者的结合显着降低了异种和异种幼苗的存活率。相反，当体型较大的捕食者被排除在外时，体型较小的捕食者会减少同种种子的存活率，从而使种子来自不同物种的遥远的树。我们的结果表明，脊椎动物捕食者根据体型大小对种子的存活率产生不同的影响。因此，砍伐森林中种子捕食者群落体型结构的变化可能会改变种子死亡率的模式，并可能影响补充和群落组成。
The Janzen-Connell hypothesis proposes that seed and seedling enemies play a major role in maintaining high levels of tree diversity in tropical forests. However, human disturbance may alter guilds of seed predators including their body size distribution. These changes have the potential to affect seedling survival in logged forest and may alter forest composition and diversity. We manipulated seed density in plots beneath con- and heterospecific adult trees within a logged forest and excluded vertebrate predators of different body sizes using cages. We show that small and large-bodied predators differed in their effect on con- and heterospecific seedling mortality. In combination small and large-bodied predators dramatically decreased both con- and heterospecific seedling survival. In contrast, when larger-bodied predators were excluded small-bodied predators reduced conspecific seed survival leaving seeds coming from the distant tree of a different species. Our results suggest that seed survival is affected differently by vertebrate predators according to their body size. Therefore, changes in the body size structure of the seed predator community in logged forests may change patterns of seed mortality and potentially affect recruitment and community composition.
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