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首页> 外文期刊>Biological invasions >Evidence for evolution of increased competitive ability for invasive Centaurea solstitialis, but not for naturalized C-calcitrapa
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Evidence for evolution of increased competitive ability for invasive Centaurea solstitialis, but not for naturalized C-calcitrapa

机译：侵袭性中心溶液竞争力增加的竞争力的探讨，但不是归化C-Calcitrapa

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摘要

Congeneric species with the same native and non-native ranges, but exhibiting different invasiveness, provide opportunities to assess the relative importance of factors contributing to successful invasions. For example, comparing the competitive ability of such congeners against other species from the native and non-native regions of invasive species can provide insight into the role of evolutionary experience with different competitors. We selected two congeneric Centaurea species with overlapping native and non-native ranges but with strikingly different invasive success, Centaurea solstitialis and C. calcitrapa, and conducted experiments with populations from each region using a suite of different native grass species from each region. When grown with Spanish grass species, competitive responses were 32% stronger for C. calcitrapa and 30% stronger for C. solstitialis, than when in competition with grasses native to California. Centaurea solstitialis from California had 66% higher competitive effects on grasses, all species considered together, than Spanish C. solstitialis; whereas the competitive effects of C. calcitrapa on grasses were not significantly different between C. calcitrapa ranges. Our results are consistent with the prediction that the evolution of increased competitive ability (EICA) might contribute to the devastating success of C. solstitialis in California, and that its absence might contribute to the modest naturalization of the non-invasive C. calcitrapa. Escape from the strong competitive effects and responses of grasses from Spain may also contribute to invasive success in California. Our results suggest that studies of EICA should be based on competitive tests, since biomass alone is not always a good predictor of competitive ability.
机译：具有相同本地和非天然范围的基因种类，但表现出不同的侵犯性，为评估有助于成功侵犯的因素的相对重要性提供了机会。例如，比较了这种同一种子对自然物种的原生和非原生区域的其他物种的竞争能力可以深入了解进化经验与不同竞争对手的作用。我们选择了两个具有重叠的天然和非天然范围的Conteneric Centaurea物种，但具有惊人的不同侵入性成功，Centaurea Solstitialis和C.Calcitrapa，并使用来自每个地区的不同天然草种套件进行了从每个地区的群体进行的实验。当用西班牙草种生长时，C. calcitapa的竞争反应比C. Solstitialis的竞争力较强，而不是与加利福尼亚州的草地竞争时。来自加利福尼亚的Centaurea Solstitialis对草的竞争效果高66％，所有物种都被认为是西班牙语C. Solstitialis;虽然C. Calcitrapa范围内C. Calcitapa对草的竞争效果没有显着差异。我们的结果与预测符合预测，即增加竞争能力（EICA）的演变可能导致加州C.Solstitialis的毁灭性成功，并且其缺失可能导致非侵入性C. Calcitrapa的适度归化。逃离西班牙草的强大竞争效果和对加利福尼亚州的侵入成功也可能有助于侵入成功。我们的研究结果表明EICA的研究应基于竞争性测试，因为仅为生物量并不总是具有竞争力的良好预测因素。

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