Pleistocene persistence and expansion in tarantulas on the Colorado Plateau and the effects of missing data on phylogeographical inferences from RADseq
Pleistocene persistence and expansion in tarantulas on the Colorado Plateau and the effects of missing data on phylogeographical inferences from RADseq
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DOI：
10.1111/mec.15588
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发表时间：
2020-08-29
影响因子：
4.9
通讯作者：
Hendrixson, Brent E.
中科院分区：
文献类型：
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作者：
Graham, Matthew R.;Santibanez-Lopez, Carlos E.;Hendrixson, Brent E.
更新世期间，北美西南部“天空岛屿”特有的山地物种受到气候变化的显著影响。我们将线粒体和基因组数据与物种分布模型相结合，以确定来自附近科罗拉多高原的大型狼蛛Aponopelma marxi是否受到冰川气候的类似影响。遗传分析显示，该物种包括三个主要分支，在更新世分歧。一个分支分布沿着Mogollon边缘似乎已经坚持在冰川条件下的地方，而其他两个分支可能殖民的物种的范围从避难所在峡谷的中部和东北部。气候模型支持这一假设的莫戈隆边缘，但晚冰期的气候数据似乎太粗糙，检测合适的地区在峡谷。峡谷避难所的位置不能推断出基因组分析，由于缺失的数据，鼓励我们探索缺失的基因座的影响，使用RADseq的地理推断。不同数量缺失数据的分析结果表明，具有大量缺失数据的样本仍然可以改善推断，并且缺失的特定位点比缺失位点的数量更重要。这项研究强调了更新世气候对科罗拉多高原特有的狼蛛的深刻影响，以及该地区动物群的混合性质。随着冰川气候的消退，一些动物最近从附近的沙漠殖民，而其他动物，如狼蛛，似乎一直存在于莫戈隆边缘和与该地区著名的河流切割峡谷有关的避难所。
Montane species endemic to the "sky islands" of the North American southwest were significantly impacted by changing climates during the Pleistocene. We combined mitochondrial and genomic data with species distribution modelling to determine whetherAphonopelma marxi, a large tarantula from the nearby Colorado Plateau, was similarly impacted by glacial climates. Genetic analyses revealed that the species comprises three main clades that diverged in the Pleistocene. A clade distributed along the Mogollon Rim appears to have persisted in place during glacial conditions, whereas the other two clades probably colonized central and northeastern portions of the species' range from refugia in canyons. Climate models support this hypothesis for the Mogollon Rim, but late glacial climate data appear too coarse to detect suitable areas in canyons. Locations of canyon refugia could not be inferred from genomic analyses due to missing data, encouraging us to explore the effect of missing loci in phylogeographical inferences using RADseq. Results from analyses with varying amounts of missing data suggest that samples with large amounts of missing data can still improve inferences, and the specific loci that are missing matters more than the number of missing loci. This study highlights the profound impact of Pleistocene climates on tarantulas endemic to the Colorado Plateau, as well as the mixed nature of the region's fauna. Some animals recently colonized from nearby deserts as glacial climates receded, whereas others, like tarantulas, appear to have persisted on the Mogollon Rim and in refugia associated with the region's famous river-cut canyons.