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首页> 美国卫生研究院文献>Genes >Habitat Fragmentation Reduces Genetic Diversity and Connectivity of the Mexican Spotted Owl: A Simulation Study Using Empirical Resistance Models
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Habitat Fragmentation Reduces Genetic Diversity and Connectivity of the Mexican Spotted Owl: A Simulation Study Using Empirical Resistance Models

机译：生境破碎减少了墨西哥斑点猫头鹰的遗传多样性和连通性：使用经验抗性模型的模拟研究。

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We evaluated how differences between two empirical resistance models for the same geographic area affected predictions of gene flow processes and genetic diversity for the Mexican spotted owl (Strix occidentalis lucida). The two resistance models represented the landscape under low- and high-fragmentation parameters. Under low fragmentation, the landscape had larger but highly concentrated habitat patches, whereas under high fragmentation, the landscape had smaller habitat patches that scattered across a broader area. Overall habitat amount differed little between resistance models. We tested eight scenarios reflecting a factorial design of three factors: resistance model (low vs. high fragmentation), isolation hypothesis (isolation-by-distance, IBD, vs. isolation-by-resistance, IBR), and dispersal limit of species (200 km vs. 300 km). Higher dispersal limit generally had a positive but small influence on genetic diversity. Genetic distance increased with both geographic distance and landscape resistance, but landscape resistance displayed a stronger influence. Connectivity was positively related to genetic diversity under IBR but was less important under IBD. Fragmentation had a strong negative influence on the spatial patterns of genetic diversity and effective population size (Ns). Despite habitats being more concentrated and less widely distributed, the low-fragmentation landscape had greater genetic diversity than the high-fragmentation landscape, suggesting that highly concentrated but larger habitat patches may provide a genetic refuge for the Mexican spotted owl.
机译：我们评估了相同地理区域的两个经验抗性模型之间的差异如何影响墨西哥斑spot（Strix occidentalis lucida）的基因流过程和遗传多样性的预测。这两个阻力模型代表了低碎片和高碎片参数下的地形。在低破碎度下，景观具有较大但高度集中的栖息地斑块，而在高破碎度下，景观具有较小的栖息地斑块，其散布在较大的区域中。抵抗模型之间的总体生境数量差异不大。我们测试了八种场景，这些场景反映了三个因素的因子设计：抗性模型（低碎片化与高碎片化），隔离假设（按距离隔离，IBD和按电阻隔离，IBR）以及物种的扩散极限（ 200公里和300公里）。较高的扩散限度通常对遗传多样性有积极影响，但影响很小。遗传距离随着地理距离和景观抗性的增加而增加，但景观抗性显示出更强的影响力。在IBR下，连通性与遗传多样性呈正相关，但在IBD下则不那么重要。碎片化对遗传多样性和有效种群规模（Ns）的空间格局有很大的负面影响。尽管栖息地更加集中且分布较不广泛，但低片段化景观比高片段化景观具有更大的遗传多样性，这表明高度集中但面积较大的栖息地可能为墨西哥斑提供了遗传庇护所。

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