EXPERIMENTAL EVOLUTION OF HETEROTROPHY IN A GREEN ALGA
Article first published online: 17 SEP 2012
© 2012 The Author(s). Evolution© 2012 The Society for the Study of Evolution.
Volume 67, Issue 2, pages 468–476, February 2013
How to Cite
Bell, G. (2013), EXPERIMENTAL EVOLUTION OF HETEROTROPHY IN A GREEN ALGA. Evolution, 67: 468–476. doi: 10.1111/j.1558-5646.2012.01782.x
- Issue published online: 28 JAN 2013
- Article first published online: 17 SEP 2012
- Accepted manuscript online: 24 AUG 2012 03:13AM EST
- Received May 2, 2012 Accepted July 23, 2012
- Acetate flagellate;
- experimental evolution;
Laboratory populations of a green alga cultured in the dark with an organic substrate evolved into efficient heterotrophs with faster growth, higher fitness, and increased responsiveness to substrate concentration. Their phenotypes were almost entirely attributable to selection, rather than to history or ancestry. The fitness of evolved lines in the light was uniformly depressed, presumably through the accumulation of conditionally deleterious genes governing photosynthesis. Some evolved lines were no longer able to grow in the light and are thereby permanently isolated from their ancestors. Specialized autotrophs and heterotrophs may often evolve in algae through long-term shifts in the conditions of growth.