PERSISTENCE OF DIFFERENT-SIZED POPULATIONS - AN EMPIRICAL-ASSESSMENT OF RAPID EXTINCTIONS IN BIGHORN SHEEP

被引：180

作者：

BERGER, J

机构：

[1] Department of Range, Wildlife, and Forestry, Department of Biology, University of Nevada, Reno, Nevada

[2] Conservation and Research Center, Smithsonian Institution, Front Royal, Virginia

来源：

CONSERVATION BIOLOGY | 1990年 / 4卷 / 01期

关键词：

D O I：

10.1111/j.1523-1739.1990.tb00271.x

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

Abstract: Theory and simulation models suggest that small populations are more susceptible to extinction than large populations, yet assessment of this idea has been hampered by lack of an empirical base. I address the problem by asking how long different‐sized populations persist and present demographic and weather data spanning up to 70 years for 122 bighorn sheep (Ovis canadensis) populations in southwestern North America Analyses reveal that: (1) 100 percent of the populations with fewer than 50 individuals went extinct within 50 years; (2) populations with greater than 100 individuals persisted for up to 70 years; and (3) the rapid loss of populations was not likely to be caused by food shortages, severe weather, predation, or interspecific competition These data suggest that population size is a marker of persistence trajectories and they indicate that local extinction cannot be overcome because 50 individuals, even in the short term, are not a minimum viable population size for bighorn sheep. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：91 / 98

页数：8

共 66 条

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