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SelectionThe Mechanism of Evolution$
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Graham Bell

Print publication date: 2007

Print ISBN-13: 9780198569725

Published to Oxford Scholarship Online: May 2008

DOI: 10.1093/acprof:oso/9780198569725.001.0001

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The genetic and ecological context of selection

The genetic and ecological context of selection

(p.20) CHAPTER 2 The genetic and ecological context of selection

Graham Bell

Oxford University Press

This chapter gives some quantitative information about the rates of genetic and environmental deterioration. The first section in this chapter is about history, chance, and necessity, and includes subsections on Lamarckian evolution; the selection of undirected variation; descent; and delection. The second section is about drift and includes subsections concerning the rate of genetic deterioration; two scaled mutation rates; the rate of deleterious mutation; decay of isolate lines in the absence of selection; mutation rate in other replicators; mutation rate in stressful environments; the genomic mutation rate; the effect of mutations; beneficial mutations; the effect of gene deletion on growth; the rate of accumulation of genetic variance in fitness; the replication limit; the size spectrum; the distribution of species abundance; and finally genetic variation and species abundance. The final section is on the rate of environmental deterioration. Subsections in this section concern aggregation; the ecological population concept; dispersal; and the genetic population concept. Five theories of the environment are offered and environmental variation in space; environmental variation over time; and the biotic environment are also detailed.

Keywords:   mutation rate, fitness, gene deletion, abundance, variation, aggregation, dispersal, spatial heterogeneity, temporal variability, size spectrum

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