Institute of Botany, University of Regensburg, Regensburg, Germany.
Plant Biol (Stuttg). 2010 May 1;12(3):537-44. doi: 10.1111/j.1438-8677.2009.00224.x.
We investigated the influence of differing life history traits on the genetic structure of the related species Mimetes fimbriifolius and Mimetes hirtus (Proteaceae), which occur in the South African fynbos. Both species are bird-pollinated and ant-dispersed, but differ in rarity, longevity, ecological strategy and the fragmentation of their distribution area. We used AFLPs to study genetic variation within and between 21 populations of these two species across their distribution range. AFLP analysis revealed significantly higher genetic variation within populations of M. fimbriifolius than within M. hirtus. While M. fimbriifolius clearly lacked any significant genetic differentiation between populations, a distinct geographic pattern was observed for M. hirtus. Differentiation was, however, stronger at the regional (Phi(PT) = 0.57) than at the local scale (Phi(PT) = 0.08). Our results clearly indicate that even closely related species that share the same mode of pollination and seed dispersal can differ in their genetic structure, depending on the magnitude of fragmentation, longevity of individuals and ecological strategy.
我们研究了不同生活史特征对相关物种 Mimetes fimbriifolius 和 Mimetes hirtus（山龙眼科）遗传结构的影响，这些物种分布在南非的 fynbos 中。这两个物种都是鸟类传粉和蚂蚁传播的，但稀有程度、寿命、生态策略和分布区域的破碎化程度不同。我们使用 AFLP 技术研究了这两个物种在其分布范围内 21 个种群内和种群间的遗传变异。AFLP 分析显示，M. fimbriifolius 种群内的遗传变异明显高于 M. hirtus 种群内的遗传变异。虽然 M. fimbriifolius 种群之间明显没有明显的遗传分化，但 M. hirtus 种群之间存在明显的地理模式。然而，在区域尺度上（Phi(PT) = 0.57）的分化强于在局部尺度上（Phi(PT) = 0.08）。我们的研究结果清楚地表明，即使是具有相同传粉和种子传播方式的密切相关的物种，由于破碎化程度、个体寿命和生态策略的不同，其遗传结构也可能存在差异。
