Is life-history buffering or lability adaptive in stochastic environments?
Article first published online: 2 APR 2009
© 2009 The Authors
Volume 118, Issue 7, pages 972–980, July 2009
How to Cite
Koons, D. N., Pavard, S., Baudisch, A. and Jessica E. Metcalf, C. (2009), Is life-history buffering or lability adaptive in stochastic environments?. Oikos, 118: 972–980. doi: 10.1111/j.1600-0706.2009.16399.x
- Issue published online: 23 JUN 2009
- Article first published online: 2 APR 2009
- Manuscript Accepted 8 January 2009
It is commonly thought that temporal fluctuations in demographic parameters should be selected against because of the deleterious impacts variation can have on fitness. A critical underpinning of this prediction is the assumption that changes in environmental conditions map linearly into changes in demographic parameters over time. We detail why this assumption may often break down and why selection should not always favor buffering of demographic parameters against environmental stochasticity. To the contrary, nonlinear relationships between the environment and demographic performance can produce asymmetric temporal variation in demographic parameters that actually enhances fitness. We extend this result to structured populations using simulation and show that ‘demographic lability’ rather than ‘buffering’ may be adaptive, particularly in organisms with low juvenile or adult survival. Finally, we review previous ecological work, and indicate cases where ‘demographic lability’ may be adaptive, then conclude by identifying research that is needed to develop a theory of life-history evolution that encompasses both demographic buffering and lability.