Evol Ecol Res 6: 103-114 (2004) Full PDF if your library subscribes.
Local adaptation within a population of Hydrocotyle bonariensis
Tiffany M. Knight* and Thomas E. Miller
Department of Biological Science, Florida State University, Tallahassee, FL 32306-1100, USA
Address all correspondence to Tiffany Knight, Department of Biology, Washington University, Box 1137, St. Louis, MO 63130, USA.
Local adaptation may occur when selection for heritable traits differs from environment to environment and gene flow among environments is restricted. In this study, we used reciprocal transplants to explore both the existence and possible causes of local adaptation in the clonal plant Hydrocotyle bonariensis at high and low elevations of sand dunes on St. George Island, Florida. Individuals found in high dune areas had substantially longer and more internodes and produced larger leaves than those from low dune areas. Reciprocal transplants used 10 genets from high dunes and 10 from low dunes. Greenhouse-grown, replicate plants from each genet were transplanted to high and low dune sites in the field, with and without the natural vegetation removed. The resulting plant growth was consistent with patterns of local adaptation: plants from high sites grew better in high sites than did plants from low sites and vice versa. A significant source × site interaction was found for final below-ground, but not above-ground, biomass. In plots with surrounding vegetation removed, plants from high and low dunes performed similarly in both environments, suggesting that local adaptation was related to interactions with other plants at each dune height. Small-scale local adaptation may be more likely in clonal plants undergoing little gene flow in spatially heterogeneous environments.
Keywords: clonal reproduction, Hydrocotyle bonariensis, local adaptation, reciprocal transplant, within-population genetic differentiation.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2004 Tiffany M. Knight. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.