Variable offspring provisioning and fitness: a direct test in the field
Article first published online: 17 SEP 2008
© 2008 The Authors. Journal compilation © 2008 British Ecological Society
Volume 23, Issue 1, pages 164–171, February 2009
How to Cite
Dziminski, M. A., Vercoe, P. E. and Roberts, J. D. (2009), Variable offspring provisioning and fitness: a direct test in the field. Functional Ecology, 23: 164–171. doi: 10.1111/j.1365-2435.2008.01480.x
- Issue published online: 16 JAN 2009
- Article first published online: 17 SEP 2008
- Received 1 November 2007; accepted 11 August 2008Handling Editor: Tony Williams
- maternal investment;
- egg size;
- 1Variation in the quality of the offspring environment can lead to the evolution of variable offspring provisioning. For variable offspring provisioning to evolve, the magnitude of provisioning per offspring must have effects on offspring and parental fitness.
- 2Females of the quacking frog, Crinia georgiana, produce clutches of eggs in which egg size varies between individuals in the population and also within clutches, independent of female size or condition. A trade-off between egg size and number exists.
- 3Using microsatellite markers to trace offspring to parents, and therefore clutch type, we tested the performance of tadpoles from clutches of large, small and variable-sized eggs in ponds in the field.
- 4Clutches of large eggs resulted in the highest parental fitness and clutches of small eggs resulted in lower parental fitness values.
- 5The parental fitness indicated that conditions in these ponds were harsh. Clutches with variable egg sizes had intermediate parental fitness but may be of benefit as a bet-hedging strategy when the qualities of ponds are unpredictable.
- 6This study provides new empirical evidence of important offspring and parental fitness consequences of variable maternal provisioning under natural conditions in the field and demonstrates the importance of moving experimental life-history studies out of the laboratory into the field where realistic selection pressures act on developing offspring.