Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/46799
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- Title
- A General model for the scaling of offspring size and adult size
- Related
- The American naturalist, Vol. 172, Issue 3, p.299-317
- DOI
- 10.1086/589889
- Publisher
- University of Chicago Press
- Date
- 2008
- Author/Creator
- Falster, Daniel S
- Author/Creator
- Moles, Angela T
- Author/Creator
- Westoby, Mark
- Description
- Understanding evolutionary coordination among different life‐history traits is a key challenge for ecology and evolution. Here we develop a general quantitative model predicting how offspring size should scale with adult size by combining a simple model for life‐history evolution with a frequency‐dependent survivorship model. The key innovation is that larger offspring are afforded three different advantages during ontogeny: higher survivorship per time, a shortened juvenile phase, and advantage during size‐competitive growth. In this model, it turns out that size‐asymmetric advantage during competition is the factor driving evolution toward larger offspring sizes. For simplified and limiting cases, the model is shown to produce the same predictions as the previously existing theory on which it is founded. The explicit treatment of different survival advantages has biologically important new effects, mainly through an interaction between total maternal investment in reproduction and the duration of competitive growth. This goes on to explain alternative allometries between log offspring size and log adult size, as observed in mammals (slope=0.95) and plants (slope=0.54). Further, it suggests how these differences relate quantitatively to specific biological processes during recruitment. In these ways, the model generalizes across previous theory and provides explanations for some differences between major taxa.
- Description
- 19 page(s)
- Subject Keyword
- allometry
- Subject Keyword
- life history
- Subject Keyword
- offspring size
- Subject Keyword
- seed size
- Subject Keyword
- Smith‐Fretwell
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Biological Sciences
- Identifier
- http://hdl.handle.net/1959.14/46799
- Identifier
- ISSN:0003-0147
- Identifier
- mq-rm-2008990027
- Language
- eng
- Rights
- Copyright 2008 by University of Chicago Press. Originally published in the American naturalist.
- Full Text
- Reviewed
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