Spatial environmental variation can select for evolvability.

Spatial environmental variation can select for evolvability.
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空间环境变化可以选择进化性。

DOI:
10.1111/j.1558-5646.2011.01283.x
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发表时间:
2011
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Feldman,MarcusW
Feldman,MarcusW
中科院分区:
--
文献类型:
--
作者:
Palmer,MichaelE;Feldman,MarcusW

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以往的研究表明,时间波动的环境可以创造间接选择的进化性的修改器。在这里,我们使用一个简单的计算模型来调查是否空间变化的环境(多个demes与有限的迁移之间,和一个不同的,静态的选择最佳在每个)也可以创建间接选择增加进化。答案出奇的复杂。环境的空间变化可以大大降低移民的生存率,因为移民可能不适应他们的新的deme,相对于现任者。现有的优势可以通过在单一的部落中偶尔的选举来消除。在某个特定族群的所有现任者死亡后,从其他族群进入的移民平均而言也会同样不适应新环境。这引发了一场快速适应的竞赛。在许多灭绝事件中,以及随后不适应的移民入侵新环境,可能会导致快速适应能力的间接选择,也称为高进化性。
Previous studies have shown that temporally fluctuating environments can create indirect selection for modifiers of evolvability. Here, we use a simple computational model to investigate whether spatially varying environments (multiple demes with limited migration among them, and a different, static selective optimum in each) can also create indirect selection for increased evolvability. The answer is surprisingly complicated. Spatial variation in the environment can sharply reduce the survival rate of migrants, because migrants may be maladapted to their new deme, relative to incumbents. The incumbent advantage can be removed by occasional extinctions in single demes. After all incumbents in a particular deme die, incoming migrants from other demes will, on average, be similarly maladapted to the new environment. This sets off a race to adapt rapidly. Over many extinction events, and the subsequent invasions by maladapted immigrants into a new environment, indirect selection for the ability to adapt rapidly, also known as high evolvability, may result.
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