Invasiveness of plants is predicted by size and fecundity in the native range.
Invasiveness of plants is predicted by size and fecundity in the native range.
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DOI：
10.1002/ece3.1432
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发表时间：
2015-05
影响因子：
2.6
通讯作者：
Hodgson, Dave
中科院分区：
文献类型：
--
作者：
Jelbert, Kim;Stott, Iain;McDonald, Robbie A.;Hodgson, Dave
入侵物种研究的一个重要目标是找到物种的关键特征，这些特征使它们易于在本土范围外入侵。 比较研究揭示了与植物入侵性相关的表型和人口特征。然而，除了少数以前的研究都是在入侵范围内进行的，这种方法可能会将入侵性的预测因子与入侵过程本身发生的变化混为一谈。 在这里，我们专注于野生植物在其原生范围内比较已知的物种的生活史特征是入侵其他地方，与他们的出口，但非入侵的亲戚。具体来说，我们测试了四个假设：入侵植物物种（1）更大;（2）更肥沃;（3）在给定的大小下表现出更高的繁殖力;（4）试图更频繁地制造种子，比它们在本地范围内的非入侵亲属。我们控制的影响，环境和同源使用同域同源或同源对原生范围。 我们发现，入侵物种比非入侵的亲戚更大。更大的尺寸产生更大的繁殖力，但我们也发现，入侵者更肥沃的单位大小。 合成：我们提供了第一个多物种，分类控制的大小比较，和繁殖力的入侵与非入侵植物在其原生范围。我们发现入侵物种更大，产生更多的种子，即使我们考虑到它们的大小差异。我们的研究结果表明，入侵植物物种很可能是入侵的结果，更大的尺寸和组成更高的繁殖力。这表明，相对于相关物种的大小和繁殖力可以用来预测哪些植物应该被隔离。
An important goal for invasive species research is to find key traits of species that predispose them to being invasive outside their native range. Comparative studies have revealed phenotypic and demographic traits that correlate with invasiveness among plants. However, all but a few previous studies have been performed in the invaded range, an approach which potentially conflates predictors of invasiveness with changes that happen during the invasion process itself. Here, we focus on wild plants in their native range to compare life-history traits of species known to be invasive elsewhere, with their exported but noninvasive relatives. Specifically, we test four hypotheses: that invasive plant species (1) are larger; (2) are more fecund; (3) exhibit higher fecundity for a given size; and (4) attempt to make seed more frequently, than their noninvasive relatives in the native range. We control for the effects of environment and phylogeny using sympatric congeneric or confamilial pairs in the native range. We find that invasive species are larger than noninvasive relatives. Greater size yields greater fecundity, but we also find that invasives are more fecund per-unit-size. Synthesis: We provide the first multispecies, taxonomically controlled comparison of size, and fecundity of invasive versus noninvasive plants in their native range. We find that invasive species are bigger, and produce more seeds, even when we account for their differences in size. Our findings demonstrate that invasive plant species are likely to be invasive as a result of both greater size and constitutively higher fecundity. This suggests that size and fecundity, relative to related species, could be used to predict which plants should be quarantined.
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