Present addresses: Angus Buckling, Department of Zoology, University of Oxford, Oxford, UK.
Experimental adaptation to high and low quality environments under different scales of temporal variation
Article first published online: 4 AUG 2006
Journal of Evolutionary Biology
Volume 20, Issue 1, pages 296–300, January 2007
How to Cite
BUCKLING, A., BROCKHURST, M. A., TRAVISANO, M. and RAINEY, P. B. (2007), Experimental adaptation to high and low quality environments under different scales of temporal variation. Journal of Evolutionary Biology, 20: 296–300. doi: 10.1111/j.1420-9101.2006.01195.x
Michael A. Brockhurst, School of Biological Sciences, University of Liverpool, UK.
Michael Travisano, Department of Biology & Biochemistry, University of Houston, Houston, Texas, USA.
Paul B. Rainey, School of Biological Sciences, University of Auckland, Auckland, New Zealand.
- Issue published online: 18 DEC 2006
- Article first published online: 4 AUG 2006
- Received 24 May 2006; revised 20 June 2006; accepted 23 June 2006
- antogonistic pleiotropy;
- experimental evolution;
- mutation accumulation;
- Pseudomonas fluorescens;
We investigated the role of the scale of temporal variation in the evolution of generalism in populations of the bacterium Pseudomonas fluorescens. Replicate populations were propagated as batch cultures for approximately 1400 generations (192 days), in either high quality media only, low quality media only, or were alternated between the two at a range of temporal scales (between 1 and 48 days). Populations evolved in alternating media showed fitness increases in both media and the rate of alternation during selection had no effect on average fitness in either media. Moreover, the fitness of these populations in high quality media was the same as for populations evolved only in high quality media and likewise for low quality media. Populations evolved only in high or low quality media did not show fitness improvements in their nonselective media. These results indicate that cost-free generalists can evolve under a wide range of temporal variation.