Geographic distribution and habitat differentiation in diploid and triploid Lilium lancifolium of South Korea
Geographic distribution and habitat differentiation in diploid and triploid Lilium lancifolium of South Korea
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DOI：
10.5109/9235
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发表时间：
2006-10
影响因子：
0.6
通讯作者：
Jong Hwa Kim;Hei Young Kyung;Yong-soon Choi;Ju Kyung Lee;M. Hiramatsu;H. Okubo
中科院分区：
文献类型：
--
作者：
Jong Hwa Kim;Hei Young Kyung;Yong-soon Choi;Ju Kyung Lee;M. Hiramatsu;H. Okubo
对生长在覆盖韩国全国的岛屿和大陆地区的二倍体和三倍体 L. lancifolium 的栖息地和地理分布进行了调查。在调查的 367 个种群中，二倍体种群和三倍体种群分别为 185 个（50.4%）和 182 个（49.6%）。二倍体仅集中分布在西部至东南沿海地区和岛屿，而三倍体主要分布在朝鲜半岛内陆地区。二倍体是沿海悬崖或海滩等海边栖息地所特有的，但绝不是内陆栖息地的。三倍体往往更喜欢经常受到干扰的内陆栖息地，如路边、耕地、丘陵和河边，尽管 23% 的三倍体个体生长在沿海悬崖上。事实表明，对受干扰栖息地的适应性对于每种细胞类型的分布范围至关重要。尽管如此，在二倍体分布范围内的沿海生境中很少发现三倍体。在自然条件下，二倍体祖先的同源三倍体形成可能会受到二倍体物种内较高的未降低配子生产力的稀有和/或少数细胞型排除的抑制。
Habitats and geographic distribution were investigated for diploid and triploid L. lancifolium grown in islands and mainland areas covering a whole country of South Korea. Of 367 populations investigated, 185 (50.4%) and 182 (49.6%), respectively, were diploid and triploid populations. Diploid was intensively dis- tributed only along western to southeastern coastal areas and islands, whereas triploid spread dominantly in inland areas of the Korean Peninsula. Diploid was specific to such seaside habitats as coastal cliffs or beaches but never to inland habitats. Triploid tended to prefer often-disturbed inland habitats such as roadsides, arable lands, hilly fields and riversides, though 23% of triploid individuals were growing in the coastal cliffs. The facts indicate that adaptability for disturbed habitats are crucial for the distribution range of each cytotype. Nonetheless, triploids were rarely found in coastal habitats within the diploid dis- tribution range. Autotriploid formation from diploid ancestors under natural conditions may be suppressed by rareness of higher unreduced gamete productivity within the diploid species and/or by minority cytotype exclusion.