How does resource supply affect evolutionary diversification?
How does resource supply affect evolutionary diversification?
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DOI：
10.1098/rspb.2006.3703
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发表时间：
2007-01-07
影响因子：
4.7
通讯作者：
Colegrave, Nick
中科院分区：
文献类型：
--
作者：
Hall, Alex R.;Colegrave, Nick
环境中不同资源的可用性会影响进化多样化的结果。多样性随资源供应的单峰分布已被广泛观察到，并在空间异质性环境中的选择背景下得到了解释。在此，我们提出了另一种机制来解释资源供应与多样化之间的关系，该机制基于对不同资源开发的选择。为了测试这一机制，我们在空间均匀的环境中进行了一项选择实验，使用荧光假单胞菌在很大范围内的资源供应率。结果表明，生态位多样化在资源可用性的中间水平达到顶峰。我们认为，这种单模态关系是由于资源竞争驱动的进化多样化，但受到不同资源类型所代表的生态机会的制约。这些过程可能是一些一般多样性格局的基础，包括物种丰富度的纬度梯度和人为环境富集的影响。
The availability of different resources in the environment can affect the outcomes of evolutionary diversification. A unimodal distribution of diversity with resource supply has been widely observed and explained previously in the context of selection acting in a spatially heterogeneous environment. Here, we propose an alternative mechanism to explain the relationship between resource supply and diversification that is based on selection for exploitation of different resources. To test this mechanism, we conducted a selection experiment using the bacterium Pseudomonas fluorescens in spatially homogeneous environments over a wide range of resource supply rates. Our results show that niche diversification peaks at intermediate levels of resource availability. We suggest that this unimodal relationship is due to evolutionary diversification that is driven by competition for resources but constrained by the ecological opportunity represented by different resource types. These processes may underlie some general patterns of diversity, including latitudinal gradients in species richness and the effects of anthropogenic enrichment of the environment.