Patterns of selection of two North American native and nonnative populations of monkeyflower (Phrymaceae)
Article first published online: 29 JUN 2009
© The Authors (2009). Journal compilation © New Phytologist (2009)
Special Issue: Plant adaptation - following in Darwin's footsteps
Volume 183, Issue 3, pages 691–701, August 2009
How to Cite
Murren, C. J., Chang, C. C. and Dudash, M. R. (2009), Patterns of selection of two North American native and nonnative populations of monkeyflower (Phrymaceae). New Phytologist, 183: 691–701. doi: 10.1111/j.1469-8137.2009.02928.x
- Issue published online: 17 JUL 2009
- Article first published online: 29 JUN 2009
- Received: 30 April 2009Accepted: 15 May 2009
- floral evolution;
- invasive species;
- local adaptation;
- mating system;
- Mimulus guttatus (monkeyflower);
- plant reproduction;
- • To better understand invasion dynamics, it is essential to determine the influence of genetics and ecology in species persistence in both native and nonnative habitats. One approach is to assess patterns of selection on floral and growth traits of individuals in both habitats.
- • Mimulus guttatus (Phrymaceae) has a mixed mating system and grows under variable water conditions across its native and nonnative range in North America. Field investigations of patterns of selection of floral and plant size traits were conducted in two native and two nonnative populations. Field-collected seed was grown and crossed in the glasshouse using a paternal half-sib design. The resulting offspring were grown in saturated and dry-down low-water conditions and the same traits were measured in both environments.
- • Patterns of selection varied across years in the native range. Nonnative populations exhibited selection for increased floral size, consistent with the hypothesis that selection favors larger size in nonnative habitats. In the glasshouse, we detected genetic variation for traits across population/treatment combinations. However, size hierarchy in the glasshouse was dependent on water conditions.
- • Our results suggest that both variable selection pressures and local adaptation probably influence the persistence of both native and nonnative populations.