Genomic Variation and Recent Population Histories of Spotted (Strix occidentalis) and Barred (Strix varia) Owls.
Genomic Variation and Recent Population Histories of Spotted (Strix occidentalis) and Barred (Strix varia) Owls.
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DOI：
10.1093/gbe/evab066
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发表时间：
2021-05-07
影响因子：
3.3
通讯作者：
Wall JD
中科院分区：
文献类型：
--
作者：
Fujito NT;Hanna ZR;Levy-Sakin M;Bowie RCK;Kwok PY;Dumbacher JP;Wall JD
斑点猫头鹰(SOS)是北美西部古老森林中的旗舰物种。近几十年来，由于伐木、野火以及与同属条纹猫头鹰(Strix Varia)的竞争导致适宜栖息地的持续减少，它们的数量有所下降。自1990年以来，北方斑点猫头鹰(S.O.caurina)一直被列入《濒危物种法》的濒危物种名单。在这里，我们使用更新的SO基因组组合和51个高覆盖率的全基因组序列来检查SO和BO的种群结构、杂交和最近种群大小的变化。我们发现，从中间羽毛形态鉴定出的潜在杂交种是纯BO、F1杂交种和F1×BO回交的混合体。此外，尽管在更新世-全新世过渡期间经历了人口瓶颈，但人口规模反弹，没有显示出任何历史上(即100年至10,000 年前)人口下降的证据。这表明，目前如此丰度的下降是由于过去一个世纪的事件。最后，我们估计西部和东部的BO在基因上已经分离了几千年，而不是之前假设的最近(即<；150 年)的分化。尽管这一结果令人惊讶，但目前尚不清楚分离后西部BO的祖先住在哪里。特别是，尽管BO在北美西部的殖民可能比第一次有记录的观测要早得多，但估计的偏离时间也可能反映了北美中部或东部未抽样的BO种群结构。
Spotted owls (SOs, Strix occidentalis) are a flagship species inhabiting old-growth forests in western North America. In recent decades, their populations have declined due to ongoing reductions in suitable habitat caused by logging, wildfires, and competition with the congeneric barred owl (BO, Strix varia). The northern spotted owl (S. o. caurina) has been listed as “threatened” under the Endangered Species Act since 1990. Here, we use an updated SO genome assembly along with 51 high-coverage whole-genome sequences to examine population structure, hybridization, and recent changes in population size in SO and BO. We found that potential hybrids identified from intermediate plumage morphology were a mixture of pure BO, F1 hybrids, and F1 × BO backcrosses. Also, although SO underwent a population bottleneck around the time of the Pleistocene–Holocene transition, their population sizes rebounded and show no evidence of any historical (i.e., 100–10,000 years ago) population decline. This suggests that the current decrease in SO abundance is due to events in the past century. Finally, we estimate that western and eastern BOs have been genetically separated for thousands of years, instead of the previously assumed recent (i.e., <150 years) divergence. Although this result is surprising, it is unclear where the ancestors of western BO lived after the separation. In particular, although BO may have colonized western North America much earlier than the first recorded observations, it is also possible that the estimated divergence time reflects unsampled BO population structure within central or eastern North America.
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影响因子：
4.5
作者：
Gutenkunst RN;Hernandez RD;Williamson SH;Bustamante CD
通讯作者：
Bustamante CD
影响因子：
2.8
作者：
BARROWCLOUGH, GF;GUTIERREZ, RJ
通讯作者：
GUTIERREZ, RJ
影响因子：
2.3
作者：
Diller, Lowell V.;Hamm, Keith A.;McDonald, Trent L.
通讯作者：
McDonald, Trent L.
影响因子：
3.3
作者：
Barrowclough, GF;Gutiérrez, RJ;Groth, JG
通讯作者：
Groth, JG
影响因子：
2.8
作者：
Dark, SJ;Gutierrez, RJ;Gould, GI
通讯作者：
Gould, GI