1996
DOI: 10.2307/5667
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Population Fluctuations, Reproductive Costs and Life-History Tactics in Female Soay Sheep

Abstract: JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. British Ecological Society is collaborating with JSTOR to digitize, preserve and extend access to Journal of Animal Ecology. Summary 1. Though models of life-history decisions… Show more

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Cited by 188 publications
(196 citation statements)
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“…Based on the number of definite incisors, all these females were age 2 and older, but we could not determine the age of females with precision. In other feral sheep, ewes between 2 and 6 years of age have identical fecundity (Clutton-Brock et al 1996). Given the short lifespan observed here (Kaeuffer et al 2007a), few ewes probably reached 6 years of age.…”
Section: Introductionmentioning
confidence: 61%
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“…Based on the number of definite incisors, all these females were age 2 and older, but we could not determine the age of females with precision. In other feral sheep, ewes between 2 and 6 years of age have identical fecundity (Clutton-Brock et al 1996). Given the short lifespan observed here (Kaeuffer et al 2007a), few ewes probably reached 6 years of age.…”
Section: Introductionmentioning
confidence: 61%
“…The genetics of litter size coupled with the cyclic dynamics could play a central role in promoting genetic variation (Hedrick 2007). Thus, homozygous twinning ewes may suffer higher costs of reproduction and increased mortality during population's crashes (Clutton-Brock et al 1996), which may increase average heterozygosity in the population over time. This cyclic selection, acting only on females, could contribute to the maintenance of genetic polymorphism in wild populations (Reinhold 2000;Hedrick 2007).…”
Section: Discussionmentioning
confidence: 99%
“…Body mass is known to be a key variable influencing female survival and their ability to raise offspring (Clutton Brock et al 1996). Such variation in female quality is also predicted to promote the evolution of male mate choice (Owens & Thompson 1994).…”
Section: Introductionmentioning
confidence: 99%
“…However, few studies have actually compared variation in these demographic parameters across broad spatial gradients (but see Saether et al 2008). This is at least partly attributable to the relative difficulty of obtaining sufficient time series data on abundance across large areas, which limits most studies of demography to a single population or a small number of discrete subpopulations in a relatively small area (e.g., Clutton-Brock et al 1996, MacCracken et al 1997, Coulson et al 2001, Stephenson et al 2006. Those few studies with sufficient data have often focused on characterizing spatial variation in temporal population dynamics (i.e., cyclic vs. non-cyclic populations) rather than sources of spatial variation in key demographic parameters (e.g., Caughley et al 1984, Forchhammer et al 1998, Stenseth et al 2002, Lima et al 2003.…”
Section: Introductionmentioning
confidence: 99%