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

T. Uller, G. M. While, E. Wapstra, D. A. Warner, B. A. Goodman, L. Schwarzkopf, Tracy Lee Langkilde, P. Doughty, R. S. Radder, D. H. Rohr, C. M. Bull, R. Shine, M. Olsson

Research output: Contribution to journalArticle

13 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)143-151
Number of pages9
JournalJournal of Evolutionary Biology
Volume22
Issue number1
DOIs
StatePublished - Jan 1 2009

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Fingerprint Dive into the research topics of 'Evaluation of offspring size-number invariants in 12 species of lizard'. Together they form a unique fingerprint.

  • Cite this

    Uller, T., While, G. M., Wapstra, E., Warner, D. A., Goodman, B. A., Schwarzkopf, L., Langkilde, T. L., Doughty, P., Radder, R. S., Rohr, D. H., Bull, C. M., Shine, R., & Olsson, M. (2009). Evaluation of offspring size-number invariants in 12 species of lizard. Journal of Evolutionary Biology, 22(1), 143-151. https://doi.org/10.1111/j.1420-9101.2008.01629.x