Document Type
Article
Publication Date
10-2020
Publication Title
Evolution
Volume
74
Issue
10
Pages
2250-2264
Publisher Name
Wiley
Abstract
Negative interactions between species can generate divergent selection that causes character displacement. However, other processes cause similar divergence. We use spatial and temporal replication across island populations of Anolis lizards to assess the importance of negative interactions in driving trait shifts. Previous work showed that the establishment of Anolis sagrei on islands drove resident Anolis carolinensis to perch higher and evolve larger toepads. To further test the interaction's causality and predictability, we resurveyed a subset of islands nine years later. Anolis sagrei had established on one island between surveys. We found that A. carolinensis on this island now perch higher and have larger toepads. However, toepad morphology change on this island was not distinct from shifts on six other islands whose Anolis community composition had not changed. Thus, the presence of A. sagrei only partly explains A. carolinensis trait variation across space and time. We also found that A. carolinensis on islands with previously established A. sagrei now perch higher than a decade ago, and that current A. carolinensis perch height is correlated with A. sagrei density. Our results suggest that character displacement likely interacts with other evolutionary processes in this system, and that temporal data are key to detecting such interactions.
Recommended Citation
Kamath, A., Herrmann, N.C., Gotanda, K.M., Shim, K.C., LaFond, J., Cottone, G., Falkner, H., Campbell, T.S. and Stuart, Y.E. (2020), Character displacement in the midst of background evolution in island populations of Anolis lizards: A spatiotemporal perspective. Evolution, 74: 2250-2264. https://doi.org/10.1111/evo.14079
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.
Copyright Statement
© The Authors, The Society for the Study of Evolution., 2020.
Comments
Author Posting © The Authors,The Society for the Study of Evolution., 2020. This is the author's version of the work. It is posted here by permission of The Authors,The Society for the Study of Evolution. for personal use, not for redistribution. The definitive version was published in Evolution, Volume 74, Issue 10, October 2020. https://doi.org/10.1111/evo.14079