Chapter

Experimental Tests of Lifelong Heterogeneity

Laurence D. Muller

in Does Aging Stop?

Published in print July 2011 | ISBN: 9780199754229
Published online September 2011 | e-ISBN: 9780199896714 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199754229.003.0008
Experimental Tests of Lifelong Heterogeneity

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Experimental tests of lifelong heterogeneity generally do not corroborate the theory. That is, populations that have evolved a considerable increase in the level of their robustness show little change in their late life patterns compared to their parental populations, and physiological manipulation of cohort heterogeneity does not significantly affect the occurrence of late life. Furthermore, lifelong heterogeneity models predict that far more individuals survive to very late ages than are observed when these models are fit to actual data. With fecundity, experimental studies have shown that heterogeneity is not lifelong; that is, heterogeneity in early fecundity does not predict late-life outcomes.

Keywords: lifelong; heterogeneity; fecundity; robustness; late-life

Chapter.  6137 words.  Illustrated.

Subjects: Evolutionary Biology

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