| Experimental adaptive radiation in Pseudomonas. | |
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MedLine Citation:
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PMID: 18707508 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We studied the importance of selection and constraint in determining the limits of adaptive radiation and the consequences of adaptive radiation in an experimental system. We propagated four replicate lines of the bacterium Pseudomonas fluorescens derived from a single ancestral clone in 95 environments, where growth was limited by the availability of a single carbon source for 1,000 generations. We then assayed the growth of the ancestral clone and the evolved lines in all 95 environments. Evolved lines increased their performance in almost every selection environment and invaded 70% of the novel environments as a direct response to selection. Direct responses tended to be larger in environments where growth was initially poor. Although evolved lines lost the ability to grow on about three substrates that their ancestor could readily grow on, the correlated response to selection was, on average, positive. The correlated response allowed all of our evolved populations to expand their niches and to occupy collectively the remaining novel habitats. This is inconsistent with classical theories of niche evolution. In the most extreme cases, adaptation occurred through "roundabout selection": lineages became adapted to an environment through selection in another environment but not through selection in the environment itself. Our results indicate that mutation accumulation by neutral drift was responsible for generating the majority of costs of adaptation. |
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Authors:
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R Craig MacLean; Graham Bell |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The American naturalist Volume: 160 ISSN: 1537-5323 ISO Abbreviation: Am. Nat. Publication Date: 2002 Nov |
Date Detail:
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Created Date: 2008-08-18 Completed Date: 2008-08-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2984688R Medline TA: Am Nat Country: United States |
Other Details:
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Languages: eng Pagination: 569-81 Citation Subset: - |
Affiliation:
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Department of Biology, McGill University, 1205 Avenue Doctor Penfield, Montreal, Quebec H3A 1B1, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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