Comparison of three techniques for genetic estimation of effective population size in a critically endangered parrot,Animal Conservation

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Comparison of three techniques for genetic estimation of effective population size in a critically endangered parrot
Animal Conservation ( IF 2.8 ) Pub Date : 2020-12-01 , DOI: 10.1111/acv.12655
G. Olah _{1,

2} , D. Stojanovic ₁ , M. H. Webb ₁ , R. S. Waples ₃ , R. Heinsohn ₁

Affiliation

Understanding the current population size of small, spatially aggregating populations of species is essential for their conservation. Reliable estimates of the effective population size (N_e) can be used to provide an early warning for conservation managers of the risks to genetic viability of small populations. Critically endangered, migratory swift parrots Lathamus discolor exist in a single panmictic population in Australia. In their Tasmanian breeding range, they are at severe risk of predation by introduced sugar gliders, exacerbated by deforestation. We used three genetic approaches to estimate N_e using DNA samples genotyped by microsatellite markers and existing life-history data of swift parrots. Based on all samples, we revealed small contemporary N_e estimates across methods (range: 44–140), supporting the need to urgently address threatening processes. Using the 0.5 N_e/N ratio calculated from demographic data suggests that the minimum potential contemporary population size is below 300 individual swift parrots. This is considerably lower than the published estimates derived from expert elicitation, and accords with modeled estimates of extinction risk in this species. Our study has important implications for other threatened species with unknown population sizes and demonstrates that by utilizing available genetic data, reasonable estimates of N_e can be derived.

中文翻译：

三种濒危鹦鹉有效种群规模遗传估计技术的比较

了解空间上聚集的小型物种种群的当前种群规模对于它们的保护至关重要。有效种群规模 (N _e ) 的可靠估计可用于为保护管理者提供关于小种群遗传生存力风险的早期预警。极度濒危的迁徙迅捷鹦鹉Lathamus discolor存在于澳大利亚的一个单一种群中。在他们的塔斯马尼亚繁殖范围内，他们面临着被引入的糖滑翔机捕食的严重风险，而且由于森林砍伐而加剧。我们使用三种遗传方法来估计 N _{e ，}使用通过微卫星标记进行基因分型的 DNA 样本和迅捷鹦鹉的现有生活史数据。基于所有样本，我们揭示了当代小 N_e跨方法估计（范围：44-140），支持紧急解决威胁过程的需要。使用根据人口统计数据计算的 0.5 N _e /N 比率表明，当代最小潜在种群数量低于 300 只鹦鹉。这大大低于从专家启发得出的已发表估计值，并且与该物种灭绝风险的模型估计值一致。我们的研究对其他种群规模未知的受威胁物种具有重要意义，并表明通过利用可用的遗传数据，可以得出对 N _{e 的}合理估计。

更新日期：2020-12-01

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