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Hybridization alters early life-history traits and increases plant colonization success in a novel region.
- Source :
-
The American naturalist [Am Nat] 2012 Feb; Vol. 179 (2), pp. 192-203. Date of Electronic Publication: 2011 Dec 19. - Publication Year :
- 2012
-
Abstract
- Hybridization is hypothesized to promote invasiveness, but empirical tests comparing the performance of hybrid taxa versus parental taxa in novel regions are lacking. We experimentally compared colonization ability of populations of wild radish (Raphanus raphanistrum) with populations of advanced-generation hybrids between wild radish and cultivated radish (Raphanus sativus) in a southeast Texas pasture, well beyond the known invasive range of hybrid radish. We also manipulated the strength of interspecific competition to better generalize across variable environments. In both competitive environments, hybrid populations produced at least three times more seeds than did wild radish populations, a distinction that was driven by greater hybrid seedling emergence, earlier hybrid emergence, and more hybrid seedlings surviving to flower, rather than by greater individual fecundity. Flowering duration in hybrids was less negatively affected by competition than it was in wild radish, while early emergence was associated with subsequent high seed output in both biotypes. Our data show that hybridization can enhance colonization success in a novel region and, by comparison with previous studies, that the life-history traits enhancing hybrid success can differ across regions, even for lineages originating from the same hybridization event. These results imply a much larger arena for hybrid success than previously appreciated.
- Subjects :
- Chimera genetics
Chimera physiology
Crops, Agricultural genetics
Crops, Agricultural physiology
Michigan
Population Dynamics
Random Allocation
Raphanus genetics
Raphanus physiology
Reproduction
Species Specificity
Texas
Chimera growth & development
Crops, Agricultural growth & development
Hybridization, Genetic
Raphanus growth & development
Subjects
Details
- Language :
- English
- ISSN :
- 1537-5323
- Volume :
- 179
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- The American naturalist
- Publication Type :
- Academic Journal
- Accession number :
- 22218309
- Full Text :
- https://doi.org/10.1086/663684