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- Experimental studies of selection and adaptation in Clarkia xantiana (Onagraceae). III. Phenotypic selection across a subspecies
Experimental studies of selection and adaptation in Clarkia xantiana (Onagraceae). III. Phenotypic selection across a subspecies
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Study of Clarki xantiana and how trait divergence reflects adaptation to region.
| creator | Eckhart, V. M. (Faculty/Staff) |
| creator | Anderson, J. T. |
| creator | Geber, M.A. |
| Title | Experimental studies of selection and adaptation in Clarkia xantiana (Onagraceae). III. Phenotypic selection across a subspecies |
| supporting host | Grinnell College. Biology |
| Index Date | 2015 |
| Date Issued | 2015 |
| Publisher | Grinnell College |
| Genre | Essays |
| Digital Origin | reformatted digital |
| Extent | 13 pages |
| Media Type | application/pdf |
| citation/reference | Anderson JT, Eckhart VM, Geber MA (2015) Experimental studies of selection and adaptation in Clarkia xantiana (Onagraceae). III. Phenotypic selection across a subspecies border. Evolution 69: 2249-2261. |
| note | Sister taxa often differ phenotypically, yet we generally do not know whether trait divergence reflects adaptation to spatially-varying selection. In a reciprocal transplant experiment, we ask whether selection favors the native phenotype in two parapatric subspecies of Clarkia xantiana (Onagraceae), an annual plant endemic to California. We quantified phenotypic selection in each of the exclusive ranges and the contact zone in two years with contrasting climates. We predicted that in the arid, pollinator-scarce eastern region of the distribution, phenotypes of the native subspecies (parviflora) have an advantage: small leaves, slow leaf growth, accelerated flowering, and diminutive flowers. In the wetter, pollinator-rich, western range of subspecies xantiana, we expected selection for the opposite phenotypes. We predicted that temporal variation in selection would favor xantiana+ 1/4 -like traits during the first wet El Ni+?o year and parviflora-like traits in the second dry La Ni+?a year. For subspecies xantiana, selection generally favored native phenotypes in the native garden. However, for parviflora, selection sometimes favored non-native trait values. We found little evidence for pollinator-mediated selection, subspecies differences in pollen limitation to reproduction, or temporal variation in selection. Phenotypic differentiation appears to reflect divergent selection in xantiana, but not parviflora. |
| Language | English |
| Topic | Biology. |
| Topic | Evolution. |
| Topic | Ecology. |
| Topic | Natural selection. |
| Topic | Plants. |
| Geographic | California |
| Temporal | 21st century |
| Classification | QH |
| Related Item | Faculty Scholarship |
| Related Item | Scholarship at Grinnell |
| Related Item | Digital Grinnell |
| Identifier (hdl) | http://hdl.handle.net/11084/13252 |
| Identifier (local) | grinnell:13252 |
| Access Condition | Copyright to this work is held by the author(s), in accordance with United States copyright law (USC 17). Readers of this work have certain rights as defined by the law, including but not limited to fair use (17 USC 107 et seq.). |
| Type of Resource | text |