Front acceleration by dynamic selection in Fisher population waves
Front acceleration by dynamic selection in Fisher population waves
复制标题
DOI：
10.1103/physreve.86.041908
复制
发表时间：
2012-10-10
影响因子：
2.4
通讯作者：
Voituriez, R.
中科院分区：
文献类型：
--
作者：
Benichou, O.;Calvez, V.;Voituriez, R.
我们引入了种群范围扩展的最小模型，其中个体的表型不存在选择优势，仅在其扩散速率上存在差异。我们发现，即使在没有遗传噪声的情况下，这种中性表型变异（即不改变生长速度）也能在前沿产生表型分离，并显著影响膨胀波的动力学特性。我们给出了一个精确的渐近行波解，并解析地证明了表型分离加速了锋面传播。这一结果与澳大利亚蔗蜍入侵或英国灌木蟋蟀入侵等实地观察结果相一致。
We introduce a minimal model of population range expansion in which the phenotypes of individuals present no selective advantage and differ only in their diffusion rate. We show that such neutral phenotypic variability (i.e., that does not modify the growth rate) alone can yield phenotype segregation at the front edge, even in absence of genetic noise, and significantly impact the dynamical properties of the expansion wave. We present an exact asymptotic traveling wave solution and show analytically that phenotype segregation accelerates the front propagation. The results are compatible with field observations such as invasions of cane toads in Australia or bush crickets in Britain.