Evaluation of offspring size–number invariants in 12 species of lizard

Uller, T., While, G.M., Wapstra, E., Warner, D.A., Goodman, B.A., Schwarzkopf, L., Langkilde, T., Doughty, P., Radder, R.S., Rohr, D.H., Bull, C.M., Shine, R., and Olsson, M. (2009) Evaluation of offspring size–number invariants in 12 species of lizard. Journal of Evolutionary Biology, 22 (1). pp. 143-151.

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Abstract

The optimal division of resources into offspring size vs. number is one of the classic problems in life-history evolution. Importantly, models that take into account the discrete nature of resource division at low clutch sizes suggest that the variance in offspring size should decline with increasing clutch size according to an invariant relationship. We tested this prediction in 12 species of lizard with small clutch sizes. Contrary to expectations, not all species showed a negative relationship between variance in offspring size and clutch size, and the pattern significantly deviated from quantitative predictions in five of the 12 species. We suggest that the main limitation of current size–number models for small clutch sizes is that they rely on assumptions of hierarchical allocation strategies with independence between allocation decisions. Indeed, selection may favour alternative mechanisms of reproductive allocation that avoid suboptimal allocation imposed by the indivisible fraction at low clutch sizes.

Item ID: 4800
Item Type: Article (Refereed Research - C1)
Keywords: life history; lizards; oviparous; resource allocation; size–number invariants; viviparous; evolution; clutch size
ISSN: 1420-9101
Date Deposited: 21 Jul 2009 06:14
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060308 Life Histories @ 60%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060299 Ecology not elsewhere classified @ 40%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
Citation Count from Web of Science Web of Science 8
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