Plant Outliers: An Ecogenetic Perspective
Plant Outliers: An Ecogenetic Perspective
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植物异常值：生态遗传学视角
DOI：
10.1086/285730
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
D. Levin
中科院分区：
文献类型：
--
作者：
D. Levin
殖民植物物种的成员通常以分散的个体形式出现，远远超出当地种群的边界。这些异常值对当地种群和整个物种的生态和遗传重要性尚未得到考虑。对异常植物和稀疏植物的生殖生物学的回顾表明，它们每朵花产生的种子比种群内的植物少。尽管如此，它们还是成功地进行了长距离杂交。我建议异常值形成大型、分散的杂交植物组合，这可能会填补一些当地种群之间的空白。这些异常组合可能是外来花粉和种子的主要来源，阻碍了它们所居住的当地种群的分化，并形成新种群的核心。离群值可能比种群内的植物承受更多或更少的害虫压力。它们充当病原体和食草动物的种群间桥梁。
Members of colonial plant species often occur as scattered individuals well beyond the borders of local populations. The ecological and genetical importance of these outliers to local populations and to the species as a whole have not been considered. A review of the reproductive biology of outliers and of sparse plants in general indicates that they produce fewer seeds per flower than plants within populations. Nevertheless, they successfully interbreed over large distances. I propose that outliers form large, diffuse assemblages of interbreeding plants that may fill the gaps between some local populations. These outlier assemblages may be prime sources of extraneous pollen and seeds, retard the divergence of local populations between which they reside, and form the nuclei for new populations. Outliers may receive more or less pest pressure than plants within populations. They serve as interpopulation bridges for pathogens and herbivores.