在一种新热带胎生鱼类的分化早期与晚期，选择作用更强。
Selection is stronger in early-versus-late stages of divergence in a Neotropical livebearing fish.
作者信息
Ingley Spencer J, Johnson Jerald B
机构信息
Department of Biology, Brigham Young University, Provo, UT 84602, USA
Department of Biology, Brigham Young University, Provo, UT 84602, USA Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602, USA.
出版信息
Biol Lett. 2016 Mar;12(3):20151022. doi: 10.1098/rsbl.2015.1022.
How selection acts to drive trait evolution at different stages of divergence is of fundamental importance in our understanding of the origins of biodiversity. Yet, most studies have focused on a single point along an evolutionary trajectory. Here, we provide a case study evaluating the strength of divergent selection acting on life-history traits at early-versus-late stages of divergence in Brachyrhaphis fishes. We find that the difference in selection is stronger in the early-diverged population than the late-diverged population, and that trait differences acquired early are maintained over time.
在我们理解生物多样性起源的过程中，选择如何在分化的不同阶段推动性状进化至关重要。然而，大多数研究都集中在进化轨迹上的单个点。在这里，我们提供了一个案例研究，评估在Brachyrhaphis鱼类分化的早期和晚期，作用于生活史性状的趋异选择强度。我们发现，早期分化种群中选择的差异比晚期分化种群更强，并且早期获得的性状差异会随着时间推移而保持。
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