A genetically based ecological trade-off contributes to setting a geographic range limit,Ecology Letters

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A genetically based ecological trade-off contributes to setting a geographic range limit
Ecology Letters ( IF 7.6 ) Pub Date : 2021-10-11 , DOI: 10.1111/ele.13900
Alexander A Mauro _{1,

2} , Julián Torres-Dowdall ₃ , Craig A Marshall ₁ , Cameron K Ghalambor _{1,

2,

4}

Affiliation

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 prevents P. reticulata from colonising brackish water. Using a combination of field transplant, common garden breeding, and laboratory behaviour experiments, we find support for this hypothesis, as P. reticulata are behaviourally subordinate and have lower survival in brackish water with P. picta. We also found a negative genetic correlation between P. reticulata growth in brackish water versus freshwater in the presence of P. picta, suggesting a genetically based trade-off between salinity tolerance and competitive ability could constrain adaptive evolution at the range limit.

中文翻译：

基于基因的生态权衡有助于设定地理范围限制

了解形成地理范围限制的生态因素以及阻止种群适应性进化超出这些限制的进化限制是一个悬而未决的问题。在这里，我们调查了为什么广盐性鱼类Poecila reticulata尽管能够耐受微咸水，但仍被限制在其原生范围内的淡水中。我们假设在微咸水中与近亲Poecilia picta 的竞争性相互作用可防止P。reticulata来自殖民微咸水。结合田间移植、普通花园育种和实验室行为实验，我们找到了对这一假设的支持，如P。网状行为从属，在含P 的微咸水中存活率较低。图片。我们还发现P之间存在负遗传相关性。在存在P的情况下，咸水与淡水中的网状藻生长。picta，表明耐盐性和竞争能力之间基于遗传的权衡可能会在范围限制上限制适应性进化。

更新日期：2021-11-11

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