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Media type:
E-Article
Title:
Extent of adaptation is not limited by unpredictability of the environment in laboratory populations of Escherichia coli
Contributor:
Karve, Shraddha M.;
Bhave, Devika;
Dey, Sutirth
Published:
Oxford University Press (OUP), 2018
Published in:
Journal of Evolutionary Biology, 31 (2018) 9, Seite 1420-1426
Language:
English
DOI:
10.1111/jeb.13338
ISSN:
1010-061X;
1420-9101
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>Environmental variability is on the rise in different parts of the earth, and the survival of many species depends on how well they cope with these fluctuations. Our current understanding of how organisms adapt to unpredictably fluctuating environments is almost entirely based on studies that investigate fluctuations among different values of a single environmental stressor such as temperature or <jats:styled-content style="fixed-case">pH</jats:styled-content>. How would unpredictability affect adaptation when the environment fluctuates between qualitatively very different kinds of stresses? To answer this question, we subjected laboratory populations of <jats:italic>Escherichia coli</jats:italic> to selection over ~ 260 generations. The populations faced predictable and unpredictable environmental fluctuations across qualitatively different selection environments, namely, salt and acidic <jats:styled-content style="fixed-case">pH</jats:styled-content>. We show that predictability of environmental fluctuations does not play a role in determining the extent of adaptation, although the extent of ancestral adaptation to the chosen selection environments is of key importance.</jats:p>