Parallelism in adaptive radiations of experimental Escherichia coli populations

Parallelism in adaptive radiations of experimental Escherichia coli populations
复制标题

实验大肠杆菌群体适应性辐射的平行性

DOI:
10.1111/evo.12841
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发表时间:
2016
期刊:
影响因子:
3.3
通讯作者:
M. Travisano
M. Travisano
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
G. Saxer;M. Travisano

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适应性辐射是物种多样性的主要贡献者。尽管自适应辐射的基本机制--专门化和权衡--相对较好地理解了,但自适应辐射的节奏和可重复性仍然难以捉摸。生态专业化可以通过扩展到新的生态位或通过分割现有的生态位来实现。为了测试资源专门化模式如何影响自适应辐射的速度和可重复性,我们选择了复制细菌种群,这些环境通过生态位扩张或生态位划分促进了多样性的进化,并在第三个低质量的单一资源环境中,在其中多样性预计不会进化。在提供生态机会的环境中,无论资源专门化的模式如何,群体大小多样性的进化速度都同样快。在低质量的环境中,多样性并没有持续地进化。我们观察到,在低质量环境中,体能改善最大,而在葡萄糖限制环境中,体能改善最小。我们没有观察到性状或环境的进化变化速度的变化,这表明有益的突变池并未耗尽。总体而言,资源专门化模式不影响自适应辐射的节奏或重复性。这些结果证明了生态进化反馈影响进化结果的局限性。
Adaptive radiations are major contributors to species diversity. Although the underlying mechanisms of adaptive radiations, specialization and trade‐offs, are relatively well understood, the tempo and repeatability of adaptive radiations remain elusive. Ecological specialization can occur through the expansion into novel niches or through partitioning of an existing niche. To test how the mode of resource specialization affects the tempo and repeatability of adaptive radiations, we selected replicate bacterial populations in environments that promoted the evolution of diversity either through niche expansion or through niche partitioning, and in a third low‐quality single‐resource environment, in which diversity was not expected to evolve. Colony size diversity evolved equally fast in environments that provided ecological opportunities regardless of the mode of resource specialization. In the low‐quality environments, diversity did not consistently evolve. We observed the largest fitness improvement in the low‐quality environment and the smallest the glucose‐limited environment. We did not observe a change in the rate of evolutionary change in either trait or environment, suggesting that the pool of beneficial mutations was not exhausted. Overall, the mode of resource specialization did not affect the tempo or repeatability of adaptive radiations. These results demonstrate the limitations of eco‐evolutionary feedbacks to affect evolutionary outcomes.
DOI: 10.1093/genetics/116.3.349
发表时间: 1987-07
期刊: Genetics
影响因子: 3.3
作者:
R. Helling;Christopher N. Vargas;Julian Adams
通讯作者: R. Helling;Christopher N. Vargas;Julian Adams
DOI: 10.1101/sqb.2009.74.018
发表时间: 2009
期刊: Cold Spring Harbor symposia on quantitative biology
影响因子: --
作者:
Barrick JE;Lenski RE
通讯作者: Lenski RE
DOI: 10.1038/ncomms6226
发表时间: 2014-10-01
影响因子: 16.6
作者:
Hiltunen, Teppo;Becks, Lutz
通讯作者: Becks, Lutz
DOI: 10.1371/journal.pcbi.1002134
发表时间: 2011-08
影响因子: 4.3
作者:
Franke J;Klözer A;de Visser JA;Krug J
通讯作者: Krug J
简单非结构化环境中的微生物进化:大肠杆菌的遗传分化。
DOI: 10.1093/genetics/137.4.903
发表时间: 1994
期刊: Genetics
影响因子: 3.3
作者:
Rosenzweig,RF;Sharp,RR;Treves,DS;Adams,J
通讯作者: Adams,J