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首页> 外文期刊>African Journal of Aquatic Science >Hybridisation between native Oreochromis species and introduced Nile tilapia O. niloticus in the Kafue River, Zambia.
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Hybridisation between native Oreochromis species and introduced Nile tilapia O. niloticus in the Kafue River, Zambia.

机译：天然Oreochromis物种与在赞比亚Kafue河中引入的尼罗罗非鱼O. niloticus之间的杂交。

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摘要

The Nile tilapia Oreochromis niloticus has been introduced throughout Africa outside its native range for aquaculture purposes. Hybridisation between escaped O. niloticus and native Oreochromis species is of concern due to potential negative effects on wild genetic resources for conservation, aquaculture and capture fisheries. We document the 2008-2010 extent of O. niloticus established in the Kafue River, Zambia, test for hybridisation with two native species, O. andersonii and O. macrochir, using eight microsatellite loci, and evaluate losses in genetic diversity. We genotyped parental O. niloticus (n=6), O. andersonii (n=22) and O. macrochir (n=28) to provide genetic baselines, and compared these to 33 fish from the Kafue River that possessed hybrid phenotypes. Analysis using the program STRUCTURE suggested that most specimens were of hybrid ancestry, representing an admixture of O. niloticus, O. andersonii and O. macrochir. Using the program NEWHYBRIDS, one individual was identified as probably being a recent hybrid. The state of tilapia biodiversity in the Kafue River suggests that non-native tilapia introduction may have negative impacts on the genetic resources available for aquaculture and fisheries. Managers should carefully account for these risks when considering further exotic introductions to regions where non-native tilapia have not yet become established.
机译：尼罗罗非鱼Oreochromis niloticus已在整个非洲以外的地方引入，用于水产养殖。由于对野生生物遗传资源的保护，水产养殖和捕捞业有潜在的负面影响，逃脱的尼罗罗非鱼（O. niloticus）物种与本地奥利奥非斯物种之间的杂交受到关注。我们记录了在赞比亚卡富厄河建立的2008年至2010年O. niloticus的程度，测试了使用八个微卫星基因座与两个本地物种O. andersonii和O. macrochir的杂交，并评估了遗传多样性的损失。我们对父母亲O. niloticus（n = 6），O。andersonii（n = 22）和O. macrochir（n = 28）进行基因分型，以提供遗传基线，并将它们与来自Kafue河的33条具有杂交表型的鱼进行比较。使用STRUCTURE程序进行的分析表明，大多数标本具有杂交血统，代表了O. niloticus，O。andersonii和O. macrochir的混合物。使用NEWHYBRIDS程序，一个人可能是最近的杂种。卡富厄河罗非鱼的生物多样性状况表明，非本地罗非鱼的引进可能对可用于水产养殖和渔业的遗传资源产生负面影响。管理者在考虑将尚未引入非本地罗非鱼的地区进一步引进外来物种时应谨慎考虑这些风险。

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