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Reproductive effort, offspring size and benefit/cost ratios in the classification of life histories

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/1653

Reproductive effort, offspring size and benefit/cost ratios in the classification of life histories

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Title: Reproductive effort, offspring size and benefit/cost ratios in the classification of life histories
Author: Charnov, Eric
Subject(s): life history classification
dimensionless numbers
life-history cube
r and K selection
Smith-Fretwell
Abstract: There have been many attempts to document links between reproductive allocation and factors such as adult body size and demography. This paper suggests that among closely related taxa, two dimensionless numbers, each a benefit–cost ratio summarizing reproductive timing, allocation and demography, are invariants and thus are useful to classify life histories. The two numbers are E/α and C·E, where E is average adult life span, α is age-at-first-reproduction and C is average mass (per adult) devoted to reproduction per unit of time, divided by the average adult body mass (m); C is usually called ‘reproductive effort’. Since E−1 is the average adult mortality rate, C/E−1 is the reproductive effort (benefit) per unit death (cost). Similarly, E/α is the amount of time for reproduction (E) divided by the time cost to get there (α). Combining these two numbers with the relative size (I) of an offspring (I/m) yields a new classification scheme for life histories; this is contrasted with other classification schemes (e.g. r and K).
Date: 2002
Publisher: Evolutionary Ecology Research
Citation: Charnov, E.L. 2002. Reproductive effort, offspring size and benefit/cost ratios in the classification of life histories. Evolutionary Ecology Research 4:749-758
URI: http://hdl.handle.net/1928/1653

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