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Relating temporal changes in species dispersion, inter-specific associations and trait dispersion to mechanisms underlying plant community assembly.

机译：将物种散布，种间关联和性状散布的时间变化与植物群落组装的基础机制联系起来。

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摘要

If neutral processes such as migration and speciation can predict the same patterns observed in natural communities traditionally attributed to competition and niche theory, how can the two mechanisms be separated? Traditional theory emphasizes the increasing importance of competition in structuring plant communities along gradients of time-since-disturbance and productivity, and hence succession, whereas neutral processes should follow no clear developmental path. Thus, spatial patterns resulting from neutral processes should have a different temporal 'signature' from patterns arising from traditional competition and niche-based mechanisms during community assembly.;Even though the dune chronosequence exhibited the classic hump-shaped pattern of species richness through succession traditionally explained by competitive mechanisms, there was little evidence that competition and niche-based mechanisms were important in determining spatial organization in this community. Instead, the increasing spatial randomness through the succession is consistent with neutral theory and the 'competitive combining ability' hypothesis, which predict competitive equivalence of species. Furthermore, the spatial randomness suggests that fitness components other than size may be important in determining competitive ability. Given that traditional competition theory is not supported in this community, the hump-shaped pattern of species richness is explained with reference to the species pool hypothesis, which suggests that few species have evolved the characteristics required to compete or tolerate competition in highly fertile, undisturbed habitats due to the historical uncommonness of these habitats.;This study investigates the potential role of 'niche' versus 'neutral' processes on several elements of spatial organization of the plant community along a sand dune chronosequence on Lake Michigan spanning 485 years of primary succession. Temporal changes in species dispersion, species associations, size distributions, and trait dispersion were compared to patterns predicted from the species segregation hypothesis, spatial niche differentiation, size-related competition theory, and the competition/colonization trade-off to infer whether competition was important in defining community structure.
机译：如果迁移和物种形成等中性过程可以预测在传统上归因于竞争和利基理论的自然群落中观察到的相同模式，那么如何将这两种机制区分开？传统理论强调，竞争在沿时间干扰和生产力以及继任性梯度构建植物群落中的重要性日益提高，而中性过程则不应遵循明确的发展道路。因此，中立过程产生的空间模式应具有与传统竞争和社区聚集过程中基于利基机制的模式不同的时间``签名'';即使沙丘的时间序列在传统上通过继承表现出经典的驼峰形物种丰富度模式用竞争机制解释，几乎没有证据表明竞争和基于小生境的机制对于确定该社区的空间组织很重要。相反，通过演替增加的空间随机性与预测物种竞争性对等的中立理论和“竞争结合能力”假说是一致的。此外，空间随机性表明，除了尺寸外，其他健身成分在确定竞争能力中可能也很重要。鉴于该社区不支持传统竞争理论，因此参照物种库假说解释了物种丰富度的驼峰状模式，这表明很少有物种进化出了在高肥力，不受干扰的环境中竞争或耐受竞争所需的特征。栖息地是由于这些生境的历史罕见性而引起的。这项研究调查了“密歇根”与“中性”过程在密歇根湖跨越沙丘时间序列的485年一次演替过程中对植物群落空间组织的几个要素的潜在作用。 。将物种散布，物种关联，大小分布和性状散布的时间变化与根据物种隔离假说，空间生态位分化，大小相关竞争理论以及竞争/殖民化权衡预测竞争是否重要而预测的模式进行了比较。在定义社区结构中。

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  • 作者

    Waugh, Jennifer M.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Biology Ecology.
  • 学位 M.Sc.
  • 年度 2006
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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