Life-history traits of voles in a fluctuating population respond to the immediate environment

Torbjørn Ergon, Xavier Lambin () and Nils Chr. Stenseth ()
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Torbjørn Ergon: University of Oslo
Xavier Lambin: University of Aberdeen
Nils Chr. Stenseth: University of Oslo

Nature, 2001, vol. 411, issue 6841, 1043-1045

Abstract: Abstract Life-history traits relating to growth and reproduction vary greatly among species and populations1,2 and among individuals within populations3. In vole populations, body size and age at maturation may vary considerably among locations and among years within the same location4,5,6,7,8. Individuals in increasing populations are typically larger and start reproduction earlier in the spring than those in declining populations6,7,8. The cause of such life-history variation within populations has been subject of much discussion7,9,10. Much of the controversy concerns whether the memory of past conditions, leading to delayed effects on life-history traits, resides in the environment (for example, predators11,12, pathogens13 or food14,15) or intrinsically within populations or individuals (age distribution16,17, physiological state3, genetic18 or maternal effects19,20). Here we report from an extensive field transplant experiment in which voles were moved before the breeding season between sites that differed in average overwintering body mass. Transplanted voles did not retain the characteristics of their source population, and we demonstrate an over-riding role of the immediate environment in shaping life-history traits of small rodents.

Date: 2001
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DOI: 10.1038/35082553

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