...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Zoologia (Curitiba) >Genetic consequences of population subdivision: the marsupial Micoureus paraguayanus (Mammalia: Didelphimorphia) as a case study
【24h】

Genetic consequences of population subdivision: the marsupial Micoureus paraguayanus (Mammalia: Didelphimorphia) as a case study

机译：人口细分的遗传后果：以有袋类巴拉圭尾猴（哺乳动物：Didelphimorphia）为例

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Habitat fragmentation may cause population subdivision, affecting genetic variation, leading to heterozygosity loss and increased inbreeding, and contributing to population extinction. However, some genetic models have shown that under some conditions, population subdivision can favor heterozygosity and allelic diversity, and small populations may adapt to inbreeding. Here I investigate the relationship between population subdivision and genetic diversity for the marsupial Micoureus paraguayanus (Tate, 1931) using the program Vortex. Hypothetical populations of 100 and 2000 individuals were partitioned into 1, 2, 5 or 10 populations that were linked by varying rates of dispersal and also by sex-biased dispersal. Results suggested that heterozygosity and allelic diversity declined rapidly when a population was subdivided. Genetic and demographic stochasticity diminished the effectiveness of selection against recessive lethal alleles. Dispersal partly reversed the impacts of population subdivision. However, even high rates of dispersal did not eliminate demographic fluctuations or prevent extinction. Although gene flow largely prevented genetic divergence between populations, dispersal did not prevent heterozygosity from being lost more rapidly in subdivided populations than in single populations of equivalent total size. The dynamics of small, fragmented populations were critically dependent on interactions between demographic and genetic processes. Populations of M. paraguayanus may have to be relatively large and continuous to avoid significant losses of genetic diversity.
机译：生境破碎化可能导致种群细分，影响遗传变异，导致杂合性丧失和近交繁殖增加，并导致种群灭绝。但是，一些遗传模型表明，在某些条件下，种群细分可以促进杂合性和等位基因多样性，并且小种群可以适应近交。在这里，我使用程序Vortex调查了有袋有鳍Micoureus paraguayanus（Tate，1931）的种群细分与遗传多样性之间的关系。假设的100个和2000个个体的人口被分为1、2、5或10个人口，这些人口通过不同的分散速度以及性别偏向的分散联系在一起。结果表明，将种群细分后，杂合性和等位基因多样性迅速下降。遗传和人口统计的随机性降低了针对隐性致死等位基因选择的有效性。分散在一定程度上扭转了人口细分的影响。但是，即使很高的分散速度也不能消除人口波动或阻止灭绝。尽管基因流动在很大程度上阻止了种群之间的遗传差异，但分散并不阻止杂合性在具有相同总大小的单个种群中比在单个种群中更快地消失。人口零散的动态主要取决于人口与遗传过程之间的相互作用。巴拉圭对虾的种群可能必须相对较大且连续，以避免遗传多样性的重大损失。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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