Plant diversity in tropical forests: a review of mechanisms of species coexistence
Plant diversity in tropical forests: a review of mechanisms of species coexistence
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DOI：
10.1007/s004420100809
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发表时间：
2017
期刊：
影响因子：
2.7
通讯作者：
Joseph S. Wright
中科院分区：
文献类型：
--
作者：
Joseph S. Wright
关于热带森林植物解释物种在超多样性群落中共存的机制的证据进行了综述。三个假说得到了强有力的支持。从沿微地形梯度的非随机空间分布和更新过程中的生存-生长权衡来看，生态位差异是明显的。寄主特有的害虫减少了在生殖成虫附近的招募(Janzen-Connell效应)，并且，负密度依赖在更多的物种之间在更大的空间尺度上发生，并可能调节它们的种群。第四个假设是，受抑制的林下植物很少相互竞争，这一假设以前从未被考虑过，对物种共存有着深远的影响。这些假设是相互兼容的。被抑制的林下植物之间的罕见竞争、生态位差异和詹森-康奈尔效应可能有助于热带森林中许多稀有植物物种的共存，而负密度依赖控制着少数最成功和最丰富的物种。
Evidence concerning mechanisms hypothesized to explain species coexistence in hyper-diverse communities is reviewed for tropical forest plants. Three hypotheses receive strong support. Niche differences are evident from non-random spatial distributions along micro-topographic gradients and from a survivorship-growth tradeoff during regeneration. Host-specific pests reduce recruitment near reproductive adults (the Janzen-Connell effect), and, negative density dependence occurs over larger spatial scales among the more abundant species and may regulate their populations. A fourth hypothesis, that suppressed understory plants rarely come into competition with one another, has not been considered before and has profound implications for species coexistence. These hypotheses are mutually compatible. Infrequent competition among suppressed understory plants, niche differences, and Janzen-Connell effects may facilitate the coexistence of the many rare plant species found in tropical forests while negative density dependence regulates the few most successful and abundant species.