Department of Biology, Gyeongsang National University, Jinju 660-701, Republic of Korea;
Am J Bot. 2002 Aug;89(8):1229-36. doi: 10.3732/ajb.89.8.1229.
Quercus acutissima (Fagaceae), a deciduous broad-leaved tree, is an important forest element in hillsides of South Korea. We used allozyme loci, Wright's F statistics, and multilocus spatial autocorrelation statistics to examine the distribution of genetic diversity within and among three local populations and the spatial genetic structure at a landscape scale (15 ha, 250 × 600 m) on Oenaro Island, South Korea. Levels of genetic diversity in Q. acutissima populations were comparable to mean values for other oak species. A moderate but significant deficit of heterozygotes (mean F(IS) = 0.069) was detected within local populations and low but significant differentiation was observed among populations (F(ST) = 0.010). Spatial autocorrelation analyses revealed little evidence of significant genetic structure at spatial scales of 100-120 m. The failure to detect genetic structure within populations may be due to intraspecific competition or random mortality among saplings, resulting in extensive thinning within maternal half-sib groups. Alternatively, low genetic differentiation at the landscape scale indicates substantial gene flow among local populations. Although wind-borne pollen may be the primary source of gene flow in Q. acutissima, these results suggest that acorn movement by animals may be more extensive than previously anticipated. Comparison of these genetic data for Oenaro Island with a disturbed isolated inland population suggests that population-to-population differences in internal genetic structure may be influenced by local variation in regeneration environment (e.g., disturbance).
锐齿栎（壳斗科）是一种落叶阔叶树种，是韩国山坡林地的重要组成部分。我们使用等位酶位点、莱特氏 F 统计量和多点空间自相关统计量，研究了韩国翁那罗岛上三个局域种群内和种群间遗传多样性的分布以及景观尺度（15 公顷，250×600 米）的空间遗传结构。锐齿栎种群的遗传多样性水平与其他栎属物种的平均值相当。在局域种群内检测到中等但显著的杂合子缺失（平均 F(IS) = 0.069），而在种群间观察到低但显著的分化（F(ST) = 0.010）。空间自相关分析表明，在 100-120 米的空间尺度上，几乎没有明显的遗传结构证据。在种群内未检测到遗传结构，这可能是由于种内竞争或实生苗的随机死亡导致母半同胞群体内广泛稀疏。或者，景观尺度上的低遗传分化表明局域种群间有大量的基因流。虽然风传花粉可能是锐齿栎基因流的主要来源，但这些结果表明，动物传播橡实的范围可能比以前预期的要广泛。将这些翁那罗岛的遗传数据与受干扰的孤立内陆种群进行比较表明，内部遗传结构的种群间差异可能受到再生环境（例如干扰）的局部变化的影响。
