Genetic diversity-area relationships across bird species

The genetic diversity-area relationship (GAR), compared to the extensively explored species-area relationship (SAR), remains poorly recognized despite the importance of understanding it for the development and application of biodiversity theory. It has been hypothesized that maintaining genetic diversity within a population is mechanistically similar to maintaining species diversity within a community, implying that GAR trajectories should mathematically behave as SAR ones. Here we test this prediction by fitting microsatellite heterozygosity and allelic richness in relation to distribution range size across bird species against eight well-known SAR models. The Monod model best described the data of resident and migratory species combined, and especially the data of resident species only, showing that with increasing range size, genetic diversity across species rapidly increased up to a certain level and then tended towards an asymptote. None of the candidate models provided an adequate...

相较于已被广泛探究的物种-面积关系（species-area relationship, SAR），遗传多样性-面积关系（genetic diversity-area relationship, GAR）的研究仍较为薄弱，尽管理解该关系对生物多样性理论的发展与应用至关重要。已有假说指出，维持种群内遗传多样性的机制与维持群落内物种多样性的机制在机理上具有相似性，这意味着GAR的变化轨迹在数学上应与SAR一致。本文通过将鸟类物种的微卫星（microsatellite）杂合性、等位基因丰富度（allelic richness）与分布区范围大小的关联数据拟合至8种经典SAR模型，对该假说进行了检验。结果显示，莫诺模型（Monod model）最能拟合留鸟（resident species）与候鸟（migratory species）的合并数据集，尤其对单独的留鸟数据集适配效果更佳，表明随着分布区范围扩大，物种间的遗传多样性会快速攀升至某一水平，随后逐渐趋近于渐近线。所有候选模型均未提供足够合理的……