Data from: Competition drives trait evolution and character displacement between Mimulus species along an environmental gradient
Kooyers, Nicholas J., University of Virginia, University of South Florida, University of California System
James, Brooke, University of Virginia
Blackman, Benjamin K., University of Virginia, University of California System
Published Feb 07, 2017 on Dryad.
Cite this dataset
Kooyers, Nicholas J.; James, Brooke; Blackman, Benjamin K. (2017). Data from: Competition drives trait evolution and character displacement between Mimulus species along an environmental gradient [Dataset]. Dryad. https://doi.org/10.5061/dryad.176f9
Closely related species may evolve to coexist stably in sympatry through niche differentiation driven by in situ competition, a process termed character displacement. Alternatively, past evolution in allopatry may have already sufficiently reduced niche overlap to permit establishment in sympatry, a process called ecological sorting. The relative importance of each process to niche differentiation is contentious even though they are not mutually exclusive and are both mediated via multivariate trait evolution. We explore how competition has impacted niche differentiation in two monkeyflowers, Mimulus alsinoides and M. guttatus, which often co-occur. Through field observations, common gardens, and competition experiments, we demonstrate that M. alsinoides is restricted to marginal habitats in sympatry and that the impacts of character displacement on niche differentiation are complex. Competition with M. guttatus alters selection gradients and has favored taller M. alsinoides with earlier seasonal flowering at low elevation and floral shape divergence at high elevation. However, no trait exhibits the pattern typically associated with character displacement, higher divergence between species in sympatry than allopatry. Thus, although character displacement was unlikely the process driving initial divergence along niche axes necessary for coexistence, we conclude that competition in sympatry has likely driven trait evolution along additional niche axes.
This is a comma delimited file (.csv) which contains phenotype data for 592 M. guttatus and M. alsinoides individuals grown within two different greenhouse common gardens.
This is a comma delimited file (.csv) which contains phenotype data for 407 M. guttatus and M. alsinoides individuals surveyed in field populations across an elevation gradient.
This is a comma delimited file (.csv) which contains phenotype and fitness data for M. guttatus and M. alsinoides individuals grown in a coexistence experiment.