The genetics of phenotypic innovation

Hubert J.E. Beaumont, Stefanie M. Gehrig, Rees Kassen, Christopher G. Knight, Jacob Malone, Andrew J. Spiers, Paul B. Rainey

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

EVOLUTIONARY EMERGENCE OF DIVERSITY

The majority of phenotypic and ecological diversity on the planet has arisen during successive adaptive radiations, that is, periods in which a single lineage diverges rapidly to generate multiple niche-specialist types. Microbiologists tend not to think of bacteria as undergoing adaptive radiation, but there is no reason to exclude them from this general statement - in fact, rapid generation times and large population sizes suggest that bacteria may be particularly prone to bouts of rapid ecological diversification. Indeed, there is evidence from both experimental bacterial populations (Korona et al., 1994; Rainey & Travisano, 1998) and natural populations (Stahl et al., 2002). This being so, insight into the evolutionary emergence of diversity requires an understanding of the causes of adaptive radiation.

The causes of adaptive radiation are many and complex, but at a fundamental level there are just two: one genetic and the other ecological. Put simply, heritable phenotypic variation arises primarily by mutation, while selection working via various ecological processes shapes this variation into the patterns of phenotypic diversity evident in the world around us.

The ecological causes of adaptive radiation are embodied in theory that stems largely from Darwin’s insights into the workings of evolutionary change (Darwin, 1890), but owes much to developments in the 1940s and 1950s attributable to Lack (1947), Dobzhansky (1951) and Simpson (1953). Recent work has seen a reformulation of the primary concepts (Schluter, 2000).

Original languageEnglish
Title of host publicationProkaryotic diversity
Subtitle of host publicationmechanisms and significance
EditorsNiall A. Logan, Hilary M. Lappin-Scott, Petra C.F. Oyston
Place of PublicationCambrdige
PublisherCambridge University Press
Pages91-104
Number of pages14
ISBN (Electronic)9780511754913
ISBN (Print)0521869358, 9780521869355
DOIs
Publication statusPublished - 1 Jan 2006
Externally publishedYes

Publication series

NameSociety for General Microbiology Symposia
PublisherCambridge University Press

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