种群可以仅在由汇生境组成的环境中持续存在。
Populations can persist in an environment consisting of sink habitats only.
作者信息
Jansen V A, Yoshimura J
机构信息
NERC Centre for Population Biology, Imperial College at Silwood Park, Ascot, Berkshire SL5 7PY, United Kingdom.
出版信息
Proc Natl Acad Sci U S A. 1998 Mar 31;95(7):3696-8. doi: 10.1073/pnas.95.7.3696.
Abstract
Populations that live in environments with different habitats have to distribute their offspring over these habitats. When population densities go to equilibrium, the evolutionary optimum is an ideal free distribution. Under an ideal free distribution, no offspring should be put into sink habitats. However, when the environmental conditions in a habitat are not constant but fluctuate, allocating offspring to sink habitats can increase the long term growth rate of a population. We demonstrate this principle in a simple model for offspring allocation. As a consequence, it is possible that populations persist in environments that only consist of sink habitats.
摘要
生活在具有不同栖息地环境中的种群必须将其后代分布在这些栖息地中。当种群密度达到平衡时，进化最优状态是理想自由分布。在理想自由分布下，不应将任何后代置于劣质栖息地。然而，当一个栖息地的环境条件并非恒定而是波动时，将后代分配到劣质栖息地可提高种群的长期增长率。我们在一个简单的后代分配模型中证明了这一原理。因此，种群有可能在仅由劣质栖息地组成的环境中持续存在。
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