Linking Resource Matching and Dispersal
Linking Resource Matching and Dispersal
复制标题
将资源匹配与分散联系起来
DOI：
10.1023/a:1011092401084
复制
发表时间：
2004
影响因子：
1.9
通讯作者：
Niclas Jonzén
中科院分区：
文献类型：
--
作者：
E. Palmqvist;P. Lundberg;Niclas Jonzén
本文从理论上研究了生境间迁移对种群大小分布的影响，并将其与期望理想自由分布（IFD）进行了比较。当两个栖息地之间的迁移是不对称的，或者在迁移过程中存在生存成本时，由此产生的种群规模的平衡分布就会偏离IFD。无论移民规则如何，这个结果都成立，即使移民的密度依赖部分通常比移民的恒定部分产生更接近IFD的分布。环境的随机性导致种群大小在两个栖息地之间呈线性关系，只有当净生境间交换为零时，斜率和截距才与IFD相同。生境间迁移的类型和不对称性将影响我们对不同生境人口分布数据的解释。由此产生的资源匹配也严重取决于种群更新和扩散的相对时间尺度，以及当种群规模与繁殖和扩散相关联时。因此，关于种群规模的数据不能不加批判地用于评估栖息地质量。
We study theoretically the effect of inter-habitat migration on the distribution of population sizes between two habitats, and compare this distribution with the expected ideal free distribution (IFD). Whenever emigration from the two habitats is asymmetric, or when there is a survival cost during migration, the resulting equilibrium distribution of population sizes deviates from the IFD. This result holds irrespective of emigration rule, even though a density-dependent fraction of emigrants generally produces a distribution closer to the IFD than a constant fraction of emigrants. Environmental stochasticity causes a linear relation between population sizes in the two habitats, with slope and intercept only identical to the IFD when net inter-habitat exchange is zero. The type and asymmetry of inter-habitat migration will influence how we should interpret data on population distribution in different habitats. The resulting resource matching is also critically contingent on the relative time-scales of population renewal and dispersal, and when population size is measured in relation to reproduction and dispersal. Therefore, data on population sizes cannot be used uncritically to assess habitat quality.