Extinction of populations by inbreeding depression under stochastic environments

被引:45
作者
Tanaka, Y [1 ]
机构
[1] Yokohama Natl Univ, Inst Environm Sci & Technol, Lab Theoret Ecol, Yokohama, Kanagawa 2408501, Japan
关键词
extinction vortex; deleterious mutation; environmental stochasticity; genetic load; conservation biology;
D O I
10.1007/s101440050009
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Inbreeding depression may induce rapid extinction due to positive feedbacks between inbreeding depression and reduction of population size, which is often referred to as extinction Vortex by inbreeding depression. The present analysis has demonstrated that the extinction Vortex is likely to happen with realistic parameter values of genomic mutation rate of lethals or semilethals, equilibrium population size, intrinsic rate of natural increase, and rate of population decline caused by nongenetic extrinsic factors. Simulation models incorporating stochastic fluctuations of population size further indicated that extinction by inbreeding depression is facilitated by environmental fluctuations in population size. The results suggest that there is a positive interaction between genetic stochasticity and environmental stochasticity for extinction of populations by inbreeding depression.
引用
收藏
页码:55 / 62
页数:8
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