Divergent environments and population bottlenecks fail to generate premating isolation in Drosophila pseudoobscura

Rundle, HD (2003) Divergent environments and population bottlenecks fail to generate premating isolation in Drosophila pseudoobscura. Evolution, 57 11: 2557-2565. doi:10.1554/02-717


Author Rundle, HD
Title Divergent environments and population bottlenecks fail to generate premating isolation in Drosophila pseudoobscura
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
Publication date 2003
Sub-type Article (original research)
DOI 10.1554/02-717
Volume 57
Issue 11
Start page 2557
End page 2565
Total pages 9
Editor D. Waller
Place of publication USA
Publisher 2004
Collection year 2004
Language eng
Subject C1
270799 Ecology and Evolution not elsewhere classified
780105 Biological sciences
Abstract While the feasibility of bottleneck-induced speciation is in doubt, population bottlenecks may still affect the speciation process by interacting with divergent selection. To explore this possibility, I conducted a laboratory speciation experiment using Drosophila pseudoobscura involving 78 replicate populations assigned in a two-way factorial design to both bottleneck (present vs. absent) and environment (ancestral vs. novel) treatments. Populations independently evolved under these treatments and were then tested for assortative mating and male mating success against their common ancestor. Bottlenecks alone did not generate any premating isolation, despite an experimental design that was conducive to bottleneck-induced speciation. Premating isolation also did not evolve in the novel environment treatment, neither in the presence nor absence of bottlenecks. However, male mating success was significantly reduced in the novel environment treatment, both as a plastic response to this environment and as a result of environment-dependent inbreeding effects in the bottlenecked populations. Reduced mating success of derived males will hamper speciation by enhancing the mating success of immigrant, ancestral males. Novel environments are generally thought to promote ecological speciation by generating divergent natural selection. In the current experiment, however, the novel environment did not cause the evolution of any premating isolation and it reduced the likelihood of speciation through its effects on male mating success.
Keyword Ecology
Evolutionary Biology
Genetics & Heredity
Assortative Mating
Divergent Selection
Founder Event
Novel Environment
Reproductive Isolation
Speciation
Genetic Covariance-matrix
Founder-effect Speciation
Laboratory Experiments
Parapatric Speciation
Experimental Tests
Flush Speciation
Mating Patterns
Melanogaster
Selection
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 03:23:10 EST