Genetic Allee effects on performance, plasticity and developmental stability in a clonal plant
Genetic Allee effects on performance, plasticity and developmental stability in a clonal plant
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遗传 Allee 对克隆植物性能、可塑性和发育稳定性的影响
DOI：
10.1111/j.1461-0248.2000.00188.x
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发表时间：
2000
期刊：
影响因子：
8.8
通讯作者：
B. Schmid
中科院分区：
文献类型：
--
作者：
M. Fischer;M. Kleunen;B. Schmid
小种群规模对适应度的负面影响，即所谓的Allee效应，可能会威胁到种群的持续性，即使在完整的栖息地遗迹。我们研究了14个孤立的克隆植物毛茛种群的基因型，分子遗传（RAPD）的变异性是大的比小的人口。在无竞争的温室环境中，来自大种群的基因型的营养后代产生更多的轮虫和花，表明更高的健身。表现性状的基因型内变异系数，表明发育不稳定，从群体具有较高的RAPD变异性的基因型较低。在与更高的草的竞争中，我们发现叶长的相对减少不太明显的植物从大的人口，这表明更高的适应性可塑性。我们的实验研究的植物主要是营养繁殖表明，最近的栖息地破碎化，而到目前为止，预计在植物频繁有性繁殖的负面遗传效应，是更严重，更常见的比以前承认的。
Negative effects of small population size on fitness, so-called Allee effects, may threaten population persistence even in intact habitat remnants. We studied genotypes of 14 isolated populations of the clonal plant Ranunculus reptans, for which molecular genetic (RAPD-) variability is higher for large than for small populations. In a competition-free greenhouse environment vegetative offspring of genotypes from large populations produced more rosettes and flowers, indicating higher fitness. Within-genotype coefficients of variation in performance traits, indicating developmental instability, were lower for genotypes from populations with higher RAPD-variability. In competition with a taller grass, we found relative reduction in leaf length less pronounced for plants from large populations, suggesting higher adaptive plasticity. Our experimental study of a plant with predominantly vegetative reproduction suggests, that negative genetic effects of recent habitat fragmentation, which so far rather were expected in plants with frequent sexual reproduction, are more severe and more common than previously acknowledged.