A resource range invariance rule for optimal offspring size predicts patterns of variability in parental phenotypes.

Abstract excerpt

Previous analysis of the rules regarding how much more a female should invest in a litter of size C rather than producing a litter with one more offspring revealed an invariance relationship between litter size and the range of resources per offspring in any litter size. The rule is that the range of resources per offspring should be inversely proportional to litter size. Here we present a modification of this...

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