Evolution of sexual systems, dispersal strategies and habitat selection in the liverwort genus Radula
Article first published online: 7 JUN 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 192, Issue 1, pages 225–236, October 2011
How to Cite
Devos, N., Renner, M. A. M., Gradstein, R., Shaw, A. J., Laenen, B. and Vanderpoorten, A. (2011), Evolution of sexual systems, dispersal strategies and habitat selection in the liverwort genus Radula. New Phytologist, 192: 225–236. doi: 10.1111/j.1469-8137.2011.03783.x
- Issue published online: 2 SEP 2011
- Article first published online: 7 JUN 2011
- Received: 7 March 2011, Accepted: 26 April 2011
- comparative methods;
- life-history theory;
- sexual system;
- •Shifts in sexual systems are among the most common and important transitions in plants and are correlated with a suite of life-history traits. The evolution of sexual systems and their relationships to gametophyte size, sexual and asexual reproduction, and epiphytism are examined here in the liverwort genus Radula.
- •The sequence of trait acquisition and the phylogenetic correlations between those traits was investigated using comparative methods.
- •Shifts in sexual systems recurrently occurred from dioecy to monoecy within facultative epiphyte lineages. Production of specialized asexual gemmae was correlated to neither dioecy nor strict epiphytism.
- •The significant correlations among life-history traits related to sexual systems and habitat conditions suggest the existence of evolutionary trade-offs. Obligate epiphytes do not produce gemmae more frequently than facultative epiphytes and disperse by whole gametophyte fragments, presumably to avoid the sensitive protonemal stage in a habitat prone to rapid changes in moisture availability. As dispersal ranges correlate with diaspore size, this reinforces the notion that epiphytes experience strong dispersal limitations. Our results thus provide the evolutionary complement to metapopulation, metacommunity and experimental studies demonstrating trade-offs between dispersal distance, establishment ability, and life-history strategy, which may be central to the evolution of reproductive strategies in bryophytes.