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


Uller, T and While, GM and Wapstra, E and Warner, DA and Goodman, BA and Schwarzkopf, L and Langkilde, T and Doughty, P and Radder, RS and Rohr, DH and Bull, CM and Shine, R and Olsson, M, Evaluation of offspring size-number invariants in 12 species of lizard, Journal of Evolutionary Biology, 22, (1) pp. 143-151. ISSN 1010-061X (2009) [Refereed Article]

DOI: doi:10.1111/j.1420-9101.2008.01629.x


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. © 2008 The Authors.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Life histories
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:While, GM (Dr Geoff While)
UTAS Author:Wapstra, E (Associate Professor Erik Wapstra)
ID Code:56266
Year Published:2009
Web of Science® Times Cited:14
Deposited By:Zoology
Deposited On:2009-04-08
Last Modified:2011-07-27

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