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首页> 外文期刊>Insect Systematics & Evolution >The ecotype paradigm: testing the concept in an ecologically divergent grasshopper
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The ecotype paradigm: testing the concept in an ecologically divergent grasshopper

机译：生态型范例：在生态多样化的蚱hopper中测试概念

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Schistocerca lineata is a widely distributed species found throughout North America, which is known to be highly variable and displays high levels of local host plant association, with four known ecotypes. Here, we test the hypothesis that the ecotype designation corresponds to genetic differentiation using molecular and morphological data by studying eight populations representing all ecotypes. Three size-dependent measures and one size-independent measure of morphology were used to evaluate phenotypic differences between populations, but these traits varied too greatly within populations and ecotypes to determine a signal of divergence. A phylogeographic analysis was unable to detect a robust signal of population-level genetic divergence. We provide evidence for a single distinct ecotype with a unique feeding habit that is genetically differentiated from all other ecotypes, suggesting that the other ecotype designations may not represent true evolutionary trajectories. Our work illustrates the need for robust molecular data when attempting to define ecotypes.
机译：Schistocerca lineata是分布在北美各地的一个广泛分布的物种，该物种高度可变，显示出高水平的本地寄主植物关联性，具有四种已知的生态型。在这里，我们通过研究代表所有生态型的八个种群，检验了使用分子和形态学数据对生态型指定与遗传分化相对应的假设。使用三种大小相关的度量和一种大小无关的形态来评估种群之间的表型差异，但是这些特征在种群和生态类型中变化太大，无法确定差异信号。系统地理分析无法检测到群体水平遗传差异的可靠信号。我们提供了具有独特喂养习惯的单一独特生态型的证据，该喂养型与所有其他生态型在基因上有所区别，这表明其他生态型名称可能并不代表真实的进化轨迹。我们的工作表明，在试图定义生态类型时，需要强大的分子数据。

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