Rates of formation and dissipation of clumping reveal lagged responses in tropical tree populations.
Rates of formation and dissipation of clumping reveal lagged responses in tropical tree populations.
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丛生的形成和消散速率揭示了热带树木种群的滞后反应。
DOI：
10.1890/15-1505.1
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发表时间：
2016
期刊：
影响因子：
4.8
通讯作者：
H. Muller‐Landau
中科院分区：
文献类型：
--
作者：
M. Detto;H. Muller‐Landau
植物种群空间格局的动态可以提供关于潜在过程的重要信息，但到目前为止，它们受到的关注相对较少。在这里，我们研究了丛集的形成和消散的速率，以及在模型和热带树木的经验数据中这些速率与聚集(丛集)程度的关系。在单变量模型中，精确解和模拟表明，空间格局的变化率与所有尺度上的聚集程度具有特定的线性关系。较短的分散和/或较弱的负密度依赖(NDD)会导致更密集和更持久的团簇。相反，在多变量寄主-寄生模型中，空间格局的变化速度相对于聚集程度更快。然后分析了28年7次调查的221个热带树种的树干≥1 cm直径的空间格局动态。我们发现，对于大多数物种来说，考虑到它们的聚集，空间格局的变化速度比单变量模型预测的要快。这表明，涉及多变量相互作用的更复杂的动力学导致这些物种对聚集的反应时滞。例如，如果天敌需要时间来定位它们的寄主聚集物，就可能出现这样的滞后。因此，理论和实验结果的结合表明，需要复杂的多层次模型来捕捉热带森林的时空动态，并为构建热带植物群落的过程提供新的见解。
The dynamics of spatial patterns of plant populations can provide important information about underlying processes, yet they have received relatively little attention to date. Here we investigate the rates of formation and dissipation of clusters and the relationship of these rates to the degree of aggregation (clumping) in models and in empirical data for tropical trees. In univariate models, exact solutions and simulations show that the rate of change of spatial patterns has a specific, linear relationship to the degree of aggregation at all scales. Shorter dispersal and/or weaker negative density dependence (NDD) result in both denser and longer-lasting clusters. In multivariate host-parasite models in contrast, the rate of change of spatial pattern is faster relative to the level of aggrega- tion. We then analyzed the dynamics of spatial patterns of stems ≥ 1 cm diameter in 221 tropical tree species from seven censuses spanning 28 yr. We found that for most species, the rates of change in spatial patterns were faster than predicted from univariate models given their aggregation. This indicates that more complex dynamics involving multivariate interactions induce time lags in responses to aggregation in these species. Such lags could arise, for example, if it takes time for natural enemies to locate aggregations of their hosts. This combination of theoretical and empirical results thus shows that complex multilevel models are needed to capture spatiotemporal dynamics of tropical forests and provides new insights into the processes structuring tropical plant communities.
影响因子：
4.8
作者：
Fluegge, Anton J.;Olhede, Sofia C.;Murrell, David J.
通讯作者：
Murrell, David J.