首页> 外文OA文献 >Signature of a Pre-Human Population Decline in the Critically Endangered Reunion Island Endemic Forest Bird Coracina newtoni
【2h】

Signature of a Pre-Human Population Decline in the Critically Endangered Reunion Island Endemic Forest Bird Coracina newtoni

机译:极度濒危的留尼汪岛特有森林鸟类Coracina newtoni的人类减少前兆

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

The exceptional biodiversity of Reunion Island is threatened by anthropogenic landscape changes that took place during the 350 years of human colonization. During this period the human population size increased dramatically from 250 to 800,000. The arrival of humans together with the development of agriculture, invasive species such as rats and cats, and deforestation has lead to the extinction of more than half of the original vertebrate species of the island. For the remaining species, significant work is being carried out to identify threats and conservation status, but little genetic work has been carried on some of the most endangered species. In the last decade theoretical studies have shown the ability of neutral genetic markers to infer the demographic history of endangered species and identify and date past population size changes (expansions or bottlenecks). In this study we provide the first genetic data on the critically endangered species the Reunion cuckoo-shrike Coracina newtoni. The Reunion cuckoo-shrike is a rare endemic forest bird surviving in a restricted 12-km(2) area of forested uplands and mountains. The total known population consists of less than one hundred individuals out of which 45 were genotyped using seventeen polymorphic microsatellite loci. We found a limited level of genetic variability and weak population structure, probably due to the limited geographic distribution. Using Bayesian methods, we identified a strong decline in population size during the Holocene, most likely caused by an ancient climatic or volcanic event around 5000 years ago. This result was surprising as it appeared in apparent contradiction with the accepted theory of recent population collapse due to deforestation and predator introduction. These results suggest that new methods allowing for more complex demographic models are necessary to reconstruct the demographic history of populations.
机译:留尼汪岛非凡的生物多样性受到人类殖民地350年间发生的人为景观变化的威胁。在此期间,人口规模从250人急剧增加到80万。人类的到来以及农业的发展,入侵性物种(例如老鼠和猫)以及森林砍伐已导致该岛一半以上的原始脊椎动物灭绝。对于其余物种,正在开展大量工作以查明威胁和保护状况,但对某些最濒危物种进行的遗传工作却很少。在过去的十年中,理论研究表明,中性遗传标记具有推断濒临灭绝物种的人口统计历史并识别和标明过去种群大小变化(扩展或瓶颈)的能力。在这项研究中,我们提供了关于极度濒危物种“团圆”杜鹃伯劳的“ Coracina newtoni”的第一个遗传数据。团圆杜鹃伯劳鸟是一种稀有的特有森林鸟类,在森林高地和山脉的受限12 km(2)区域中生存。总已知种群由不到一百个个体组成,其中有45个是使用17个多态微卫星基因座进行基因分型的。我们发现遗传变异水平有限且种群结构薄弱,可能是由于地理分布有限所致。使用贝叶斯方法,我们确定了全新世期间人口规模的急剧下降,这很可能是由大约5000年前的一次古老的气候或火山事件引起的。这一结果令人惊讶,因为它与由于森林砍伐和引入掠食者而导致的近期人口崩溃的公认理论明显矛盾。这些结果表明,允许使用更复杂的人口统计学模型的新方法对于重建人口统计学历史是必要的。

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号