...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecology letters >Connecting geographical distributions with population processes
【24h】

Connecting geographical distributions with population processes

机译：将地理分布与人口过程联系起来

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

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

摘要

The geographical distribution of a species is determined by a large number of complex processes operating over spatial scales spanning 10 orders of magnitude. Patterns in population processes have been described at numerous scales. We show that two patterns, measured at different scales, jointly allow us to infer heretofore unknown patterns in the distribution of demographic patterns across the geographical range of a species. The resulting model describes three fundamentally different modes of geographical variation in vital rates of populations. One model is characterized by a positive nonlinear relationship between the maximum rate of population growth and the intensity of intraspecific competition across a geographical range. That is, populations that grow rapidly are also those where individuals experience the greatest per capita negative effect of the presence of other individuals. The second model of behaviour is described by a negative nonlinear relationship between maximum growth rate and density dependence. Under this scenario, populations with low capacity to grow rapidly have highest intensities of intraspecific competitive effects. A third mode of behaviour is characterized by a weak positive relationship between growth rate and intraspecific competition, with very little geographical variation in maximum growth rate. A survey of studies relating temporal means and variances in population abundance for a variety of species indicate that the second mode of geographical variation in population dynamics across species range is the most common, though a few species appear to be characterized by the third mode.
机译：一个物种的地理分布是由许多复杂的过程决定的，这些过程在跨越10个数量级的空间尺度上运行。人口过程中的模式已被描述为多种规模。我们表明，在不同规模下测量的两种模式共同使我们能够推断出迄今为止在物种地理范围内的人口统计学模式分布中的未知模式。结果模型描述了人口生命率的三种根本不同的地理变异模式。一种模型的特征是最大人口增长率与整个地理范围内种内竞争的强度之间呈正非线性关系。就是说，快速增长的人口也是那些个体经历其他个体的最大人均负面影响的人群。行为的第二个模型由最大增长率和密度依赖性之间的负非线性关系描述。在这种情况下，低增长能力的种群具有最高的种内竞争效应强度。第三种行为模式的特征在于，增长率与种内竞争之间的正相关性较弱，最大增长率的地理差异很小。一项有关各种物种的时间平均值和种群数量差异的研究调查表明，第二种地理分布的种群动态地理变异是最普遍的，尽管少数物种似乎具有第三种特征。

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