Forest cover at landscape scales increases male and female gametic diversity of palm seedlings
Forest cover at landscape scales increases male and female gametic diversity of palm seedlings
复制标题
景观尺度的森林覆盖增加了棕榈幼苗的雄性和雌性配子多样性
作者：
Zoe Diaz;J. Karubian
遗传多样性决定了植物种群的进化潜力。对于异交植物，遗传多样性受到有效种群大小和扩散的影响，首先是父本配子通过花粉，然后是父本配子和母本配子通过种子。森林丧失往往会减少遗传多样性，但它对父亲和母亲对遗传多样性的贡献的不同影响程度，以及这些影响最明显的空间范围，人们知之甚少。为了解决这些问题，我们对从厄瓜多尔29个广泛分布的地点收集的504株动物分散的棕榈树幼苗进行了基因分型，并分解了父本配子和母本配子对整体遗传多样性的贡献。景观尺度(10公里半径)的森林复盖量与雄性和雌性的配子多样性都有同样显著的正相关。此外，森林覆盖率与有效人口数量之间存在显著的正相关。在低森林覆盖率的地点观察到雌性配子相对于雄性配子具有更强的精细空间遗传结构，但这并没有扩大到雄性和雌性配子多样性的差异。这些结果表明，在空间尺度上森林覆盖率的减少比生态学研究中通常评估的要大得多，导致雄配子和雌配子的多样性显著和同等程度的减少，这种景观水平的森林损失与遗传多样性之间的联系可能是由红豆杉有效种群数量的减少直接推动的，而不是通过间接干扰当地的扩散过程。
Genetic diversity shapes the evolutionary potential of plant populations. For outcrossing plants, genetic diversity is influenced by effective population size and by dispersal, first of paternal gametes through pollen, and then of paternal and maternal gametes through seeds. Forest loss often reduces genetic diversity, but the degree to which it differentially impacts the paternal and maternal contributions to genetic diversity and the spatial scale at which these impacts are most pronounced are poorly understood. To address these questions, we genotyped 504 seedlings of the animal‐dispersed palm Oenocarpus bataua collected from 29 widely distributed sites across Ecuador and decomposed the contribution of paternal and maternal gametes to overall genetic diversity. The amount of forest cover at a landscape scale (>10 km radius) had an equally significant positive association with both male and female gametic diversity. In addition, there was a significant positive association between forest cover and effective population size. Stronger fine‐scale spatial genetic structure for female versus male gametes was observed at sites with low forest cover, but this did not scale up to differences in male versus female gametic diversity. These findings show that reductions in forest cover at spatial scales much larger than those typically evaluated in ecological studies lead to significant, and equivalent, decreases of diversity in both male and female gametes, and that this association between landscape level forest loss and genetic diversity may be driven directly by reductions in effective population size of O. bataua, rather than by indirect disruptions to local dispersal processes.
影响因子：
3.3
作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
通讯作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly