Trade-offs and the evolution of life-histories during range expansion
Trade-offs and the evolution of life-histories during range expansion
复制标题
DOI：
10.1111/j.1461-0248.2010.01505.x
复制
发表时间：
2010-10-01
期刊：
影响因子：
8.8
通讯作者：
Travis, Justin M. J.
中科院分区：
文献类型：
--
作者：
Burton, Olivia J.;Phillips, Ben L.;Travis, Justin M. J.
在分布范围扩张期间，种群扩张边缘的个体面临着独特的选择环境。在这项研究中，我们使用一个三性状权衡模型来探究分布范围扩张过程中扩散、繁殖和竞争能力的演化。我们表明，由于分布范围前沿与稳定种群和核心种群所面临的选择压力不同，分布范围扩张极大地影响了生活史性状的演化。在分布范围扩张期间，在扩张的种群前沿，扩散和繁殖受到选择，而与平衡密度下适合度相关的性状（竞争能力）则显著下降。此外，我们证明，竞争物种的存在会大大降低在扩张前沿扩散向上被选择的程度。这些发现对于理解入侵物种的扩散速度以及本地物种响应气候变化的分布范围变动动态具有重要意义。
P>During range-advance, individuals on the expanding edge of the population face a unique selective environment. In this study, we use a three-trait trade-off model to explore the evolution of dispersal, reproduction and competitive ability during range expansion. We show that range expansion greatly affects the evolution of life-history traits due to differing selection pressures at the front of the range compared with those found in stationary and core populations. During range expansion, dispersal and reproduction are selected for on the expanding population front, whereas traits associated with fitness at equilibrium density (competitive ability) show dramatic declines. Additionally, we demonstrate that the presence of a competing species can considerably reduce the extent to which dispersal is selected upwards at an expanding front. These findings have important implications for understanding both the rate of spread of invasive species and the range-shifting dynamics of native species in response to climate change.