Anthropogenic Impacts Facilitate Native Fish Hybridization in the Bonneville Basin of Western North America
Anthropogenic Impacts Facilitate Native Fish Hybridization in the Bonneville Basin of Western North America
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DOI：
10.1080/00028487.2016.1235611
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发表时间：
2017-01-01
影响因子：
1.4
通讯作者：
Douglas, Michael E.
中科院分区：
文献类型：
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作者：
Bangs, Max R.;Douglas, Marlis R.;Douglas, Michael E.
栖息地的改变和引进的物种正在影响北美西部的本地鱼类，干旱和人为取水加剧了这种情况。其中一个值得关注的物种是位于犹他州、爱达荷州和怀俄明州邦纳维尔盆地的蓝头吸盘鱼Catostomus discobolus，它的种群数量急剧下降，而与当地的犹他州吸盘鱼C杂交可能会加剧这种情况。阿登为了评估这种情况，我们对81只蓝头吸盘鱼的三个诊断性核DNA位点和两个线粒体基因进行了测序，其中74只在全流域遗传评估中收集，7只来自有针对性的形态学评估。结合起来，我们检测到14个杂交种从单一网站在熊河和三个网站在韦伯河，主机三个最大的剩余人口在流域。所有的个人采样为假定的杂交种被确认为F-1杂交种，确定外地为基础的形态鉴定的效力。杂交对于数量减少的蓝头吸盘来说可能特别成问题，因为它会进一步抑制招募。然而，没有发现后F-1回交的证据，这反过来又表明，杂种没有繁殖，尽管目前还不清楚其原因。这些结果强调了量化杂交导致蓝头吸盘招聘损失的比例的必要性。
Habitat modification and introduced species are impacting native fishes in western North America, a situation now exacerbated by drought and anthropogenic water acquisition. One species of concern, the Bluehead Sucker Catostomus discobolus in the Bonneville basin of Utah, Idaho, and Wyoming, has experienced sharp population declines potentially augmented by hybridization with native Utah Sucker C. ardens. To evaluate this situation, we sequenced three diagnostic nuclear DNA loci and two mitochondrial genes across 81 Bluehead Suckers, 74 of which were collected in a basinwide genetic assessment and 7 from a targeted morphological evaluation. Combined, we detected 14 hybrids from the single site in the Bear River and the three sites in the Weber River that hosts the three largest remaining populations in the basin. All individuals sampled as putative hybrids were confirmed as F-1 hybrids, ascertaining efficacy of field-based morphological identifications. Hybridization may be especially problematic for the numerically reduced Bluehead Sucker because it can further depress recruitment. However, no evidence of post-F-1 backcrosses was found, suggesting in turn that hybrids are not reproducing, although the reasons for this are currently not understood. These results underscore the need to quantify the proportion of Bluehead Sucker recruitment lost to hybridization.