The demographic basis of population regulation in columbian ground squirrels

The American Naturalist
F S Dobson, M K Oli

Abstract

Environmental factors influence the dynamics and regulation of biological populations through their influences on demographic variables, but demographic mechanisms of population regulation have received little attention. We investigated the demographic basis of regulation of Columbian ground squirrel (Spermophilus columbianus) populations under natural and experimentally food-supplemented conditions. Food supplementation caused substantial increases in population density, and population densities returned to pretreatment levels when the supplementation ended. Control (untreated) populations remained relatively stable throughout the study period (1981-1986). Because food resources regulated the size of the ground squirrel populations, we used life-table response experiment (LTRE) analyses to examine the demographic basis of changes in population growth rate and thus also demographic influences on population regulation. LTRE analyses of two food-manipulated populations revealed that changes in age at maturity and fertility rate of females generally made the largest contributions to observed changes in population growth rate. Thus, our results suggested that abundance of food resources regulated the size of our study populations t...Continue Reading

References

Jun 1, 1954·The Quarterly Review of Biology·L C COLE

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Citations

May 25, 2006·Proceedings. Biological Sciences·Tim G BentonTim N Coulson
Aug 25, 2006·Proceedings. Biological Sciences·Sébastien DescampsJean-Michel Gaillard
Jun 19, 2008·Biological Reviews of the Cambridge Philosophical Society·T C R White
Jul 12, 2013·PloS One·William J LoughryMadan K Oli
Nov 16, 2013·The American Naturalist·Bernt-Erik SaetherHenri Weimerskirch
May 17, 2007·Ecology·S TwomblyN Thompson Hobbs
Sep 3, 2011·Molecular Ecology·Coline M ArnaudJan O Murie
Jun 17, 2011·American Journal of Primatology·Heather S Zimbler-Delorenzo, F Stephen Dobson
Sep 24, 2010·Annals of the New York Academy of Sciences·Ronald D BassarDavid N Reznick
Sep 6, 2012·Evolution; International Journal of Organic Evolution·David N ReznickF Helen Rodd
Dec 22, 2005·Molecular Ecology·M CharpentierM Hossaert-McKey
Apr 15, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Shirley RavehF Stephen Dobson
Jan 11, 2020·Ecology·Madan K OliJames E Hines
Aug 22, 2020·Current Biology : CB·Nathan W Cooper, Peter P Marra

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