Wright S Joseph, Trakhtenbrot Ana, Bohrer Gil, Detto Matteo, Katul Gabriel G, Horvitz Nir, Muller-Landau Helene C, Jones Frank A, Nathan Ran
Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Panama.
Proc Natl Acad Sci U S A. 2008 Dec 9;105(49):19084-9. doi: 10.1073/pnas.0802697105. Epub 2008 Dec 5.
Traits associated with seed dispersal vary tremendously among sympatric wind-dispersed plants. We used two contrasting tropical tree species, seed traps, micrometeorology, and a mechanistic model to evaluate how variation in four key traits affects seed dispersal by wind. The conceptual framework of movement ecology, wherein external factors (wind) interact with internal factors (plant traits) that enable movement and determine when and where movement occurs, fully captures the variable inputs and outputs of wind dispersal models and informs their interpretation. We used model calculations to evaluate the spatial pattern of dispersed seeds for the 16 factorial combinations of four traits. The study species differed dramatically in traits related to the timing of seed release, and a strong species by season interaction affected most aspects of the spatial pattern of dispersed seeds. A rich interplay among plant traits and seasonal differences in atmospheric conditions caused this interaction. Several of the same plant traits are crucial for both seed dispersal and other aspects of life history variation. Observed traits that limit dispersal are likely to be constrained by their life history consequences.
在同域分布的风媒传播植物中，与种子传播相关的性状差异极大。我们使用了两种形成对比的热带树种、种子收集器、微气象学以及一个机理模型，来评估四个关键性状的变异如何影响风对种子的传播。运动生态学的概念框架，即外部因素（风）与使运动成为可能并决定运动何时何地发生的内部因素（植物性状）相互作用，充分涵盖了风传播模型的可变输入和输出，并为其解释提供了依据。我们使用模型计算来评估四个性状的16种因子组合下种子传播的空间格局。研究的树种在与种子释放时间相关的性状上差异显著，并且季节与物种之间的强烈相互作用影响了种子传播空间格局的大多数方面。植物性状与大气条件季节差异之间丰富的相互作用导致了这种相互作用。一些相同的植物性状对于种子传播和生活史变异的其他方面都至关重要。观察到的限制传播的性状可能会受到其生活史后果的限制。
