Global change: biological invasions

Today's powerpoint file

Among the most important components of global change are changes in land use and land cover, particularly biological invasions

Biological invasions are evolutionarily unique events; they have profound costs, ecologically and economically

Each species is capable of invading new sites, and each ecosystem is susceptible to invasion by new species; a successful invasion therefore depends on the match between attributes of the potential invader and environmental characteristics of the site

Thus, from the standpoint of management, each biological invader must be managed locally: There is no silver bullet

This class will provide an overview of a common nonnative plant in southern Arizona (Lehmann lovegrass, Eragrostis lehmanniana). Specifically, we will describe a large-scale experiment in the Huachuca Mountains.

The experiment investigates the role of prescribed fire (manipulative) and Lehmann lovegrass (mensurative)

Factor levels are fire season (spring, summer, none) and abundance of Lehmann lovegrass (dominant, mixed with native grasses, absent)

Response measures include birds, small mammals, arthropods, and plants (including herbs, woody plants, and agave); today we will focus on plants

Specifically, we will detail methods ...

... and results

Additional Information (also see assigned readings):

Mooney, H.A., R.N. Mack, J.A. McNeely, L.E. Neville, P.J. Schei, and J.K. Waage. 2005. Invasive Alien Species: A New Synthesis. SCOPE Series Volume 63. Island Press, Washington, D.C.

Progress Report