A genetically based ecological trade‐off contributes to setting a geographic range limit
A genetically based ecological trade‐off contributes to setting a geographic range limit
复制标题
基于基因的生态权衡有助于设定地理范围限制
DOI：
10.1111/ele.13900
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Angert, ed., Amy
中科院分区：
文献类型：
--
作者：
Mauro, Alexander A.;Torres‐Dowdall, Julián;Marshall, Craig A.;Ghalambor, Cameron K.;Angert, ed., Amy
了解形成地理范围限制的生态因素和阻止种群适应性进化超过这些限制的进化限制是一个尚未解决的问题。在这里，我们调查了为什么广盐性鱼类，Poecila reticulata，是局限于淡水在其原生范围内，尽管是耐咸水。我们假设，在微咸水中，与近亲花斑蝶（Poecilia picta）的竞争性相互作用阻止了网状花斑蝶在微咸水中定居。通过田间移植、普通花园饲养和实验室行为实验的结合，我们发现支持这一假设的是，网纹拟步行虫在行为上是从属的，在微咸水中与P.picta的存活率较低。我们还发现，在微咸水中与存在P.picta的淡水中，P. reticulatagrogrowth之间存在负的遗传相关性，这表明基于遗传的耐盐性和竞争能力之间的权衡可能会限制适应性进化的范围限制。
Understanding the ecological factors that shape geographic range limits and the evolutionary constraints that prevent populations from adaptively evolving beyond these limits is an unresolved question. Here, we investigated why the euryhaline fish,Poecila reticulata, is confined to freshwater within its native range, despite being tolerant of brackish water. We hypothesised that competitive interactions with a close relative,Poecilia picta, in brackish water preventsP.reticulatafrom colonising brackish water. Using a combination of field transplant, common garden breeding, and laboratory behaviour experiments, we find support for this hypothesis, asP.reticulataare behaviourally subordinate and have lower survival in brackish water withP.picta. We also found a negative genetic correlation betweenP.reticulatagrowth in brackish water versus freshwater in the presence ofP.picta, suggesting a genetically based trade‐off between salinity tolerance and competitive ability could constrain adaptive evolution at the range limit.