EXTINCTION AND ISOLATION GRADIENTS IN METAPOPULATIONS - THE CASE OF THE POOL FROG (RANA-LESSONAE)

被引:203
作者
SJOGREN, P
机构
[1] Department of Zoology, Section of Animal Ecology, Uppsala University, Uppsala, S-751 22
关键词
METAPOPULATION; EXTINCTION; ISOLATION; POPULATION FLUCTUATIONS; DEMOGRAPHY; FERTILITY; HETEROZYGOSITY; RANA-LESSONAE;
D O I
10.1111/j.1095-8312.1991.tb00556.x
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Loral extinction along the intrinsic isolation gradient within metapopulations is reviewed with particular reference to a study of the pool frog (Rana lessonaé) on the northern periphery of its geographical range. As in the pool frog, many other different tax a show significantly increased extinction probabilities with increased interpopulation distance. Present data imply that the relative impact of demographic and genetic factors in such stochastic extinctions depends on the genetic history of the metapopulation; data also imply that populations fluctuate more greatly in size than predicted from demographic models which have been commonly referred to. By mitigating such fluctuations and inbreeding, and compensating for emigration, immigration undoubtedly ‘rescues’ local populations from extinction. In this way, and not just in terms of recolonization, connectivity is concluded to be a key to metapopulation persistence. Implications for conservation are also presented. Copyright © 1991, Wiley Blackwell. All rights reserved
引用
收藏
页码:135 / 147
页数:13
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