Present address: Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA.
Climate, competition, and the coexistence of island lizards
Article first published online: 19 APR 2006
Volume 20, Issue 2, pages 315–322, April 2006
How to Cite
BUCKLEY, L. B. and ROUGHGARDEN, J. (2006), Climate, competition, and the coexistence of island lizards. Functional Ecology, 20: 315–322. doi: 10.1111/j.1365-2435.2006.01095.x
- Issue published online: 19 APR 2006
- Article first published online: 19 APR 2006
- Received 14 October 2005; revised 13 December 2005; accepted 14 December 2005 Editor: Charles A. Fox
- bioenergetic model;
- environmental gradient;
- habitat selection;
- species distributions;
- thermal physiology
- 1The influence of environmental temperatures and competition combine to determine the distributions of island lizards. Neither a bioenergetic model nor simple models of competition alone can account for the distributions. A mechanistic, bioenergetic model successfully predicts how the abundance of a solitary Anolis lizard species will decline along an island's elevation gradient. However, the abundance trends for sympatric lizards diverge from the predictions of the non-interactive model.
- 2Here we incorporate competition in the bioenergetic model and examine how different forms of competition modify the temperature-based abundance predictions.
- 3Applying the bioenergetic model with competition to an island chain tests whether the model can successfully predict on which islands two lizards species will coexist.
- 4Coexistence is restricted to the two largest islands, which the model predicts have substantially greater carrying capacities than the smaller islands. The model successfully predicts that competition prevents species coexistence on the smallest islands. However, the model predicts that the mid-sized islands are capable of supporting substantial populations of both species. Additional island characteristics, such as habitat diversity, resource availability and temporal disturbance patterns, may prevent coexistence.