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首页> 外文期刊>Conservation genetics >Introduced populations as genetic reservoirs for imperiled species: A case study of the Arkansas River Shiner (Notropis girardi)
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Introduced populations as genetic reservoirs for imperiled species: A case study of the Arkansas River Shiner (Notropis girardi)

机译：引入种群作为濒危物种的遗传资源库：以阿肯色河光辉为例（Notropis girardi）

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摘要

The Arkansas River Shiner is a threatened species that has been extirpated throughout much of its native range (Arkansas River drainage) and remaining populations are imperiled. Prior to 1978, this species was accidently introduced to the Pecos River (Rio Grande drainage) via bait bucket, and has since persisted for over 30 years. Genetic data show that the Pecos River population maintains comparable levels of diversity at mitochondrial DNA and microsatellite loci relative to native range populations. Hence, we examined several factors that could be responsible for high introduced genetic diversity including (a) multiple introductions from genetically distinct sources (b) introduction of individuals from a genetically diverse source followed by rapid population expansion, (c) presence of life-history traits that foster propagule diversity and wide spatio-temporal demographic and genetic mixing; and (d) introduction to a suitable habitat in the non-native range. Our findings indicate Arkansas River Shiner was likely introduced from the Canadian River and subsequently experienced rapid population expansion that mitigated loss of diversity during the founding event. Threats to native Arkansas River Shiner have increased due to ongoing drought and water resource development, thus a finding of high diversity in the Pecos River suggests conservation significance of this non-native population. Further, it identifies the Pecos River as both a refuge for native endemic fishes and of genetic diversity of introduced, yet threatened, species.
机译：阿肯色河闪闪发光是一种受威胁物种，已在其大部分原住民范围（阿肯色河排水系统）中灭绝，剩余人口受到威胁。 1978年之前，该物种通过诱饵桶意外地引入了佩科斯河（里奥格兰德河排水系统），至今已经存在了30多年。遗传数据显示，与自然范围种群相比，佩科斯河种群的线粒体DNA和微卫星基因座保持了相当水平的多样性。因此，我们研究了可能导致高遗传多样性引入的几个因素，其中包括（a）来自遗传不同来源的多次引入（b）来自遗传不同来源的个体的引入，接着是人口的快速扩张，（c）生命史的存在促进繁殖多样性和广泛的时空人口和遗传混合的特征; （d）介绍非本地范围内的适当栖息地。我们的发现表明，阿肯色河河道可能是从加拿大河引入的，随后经历了人口的迅速扩张，从而减轻了建国初期多样性的丧失。由于持续的干旱和水资源开发，对阿肯色州河道光泽的威胁增加了，因此在佩科斯河发现高度多样性表明该非本地人口的保护意义。此外，它还把佩科斯河确定为既是当地特有鱼类的避难所，又是引进但受威胁物种的遗传多样性的避难所。

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