But the valley is being degraded by non-native invasive plants, particularly giant reed (Arundo donax), castor bean (Ricinus communis) and salt cedar (Tamarix spp.; SWIA 2002). These plants reduce the beneficial uses, alter vegetation structure, displace native plant species, and degrade habitats for native animal species. They also increase fire frequency, alter soil chemistry, reduce surface water availability, and alter rates of sedimentation and erosion.
The Tijuana River Valley Invasive Plant Control Program was started by SWIA in 2002 with funding from the California State Coastal Conservancy and the U.S. Fish & Wildlife Service. The purpose of the program was to obtain the support of the various public landowners in the valley and to start control activities on a small scale. During Phase 1 of the project, a Technical Advisory Group (TAG) was formed, the distributions of the target species were mapped, an control plan was developed, all the necessary environmental permits were obtained, and experimental treatments in small demonstration sites were conducted. In 2004, funding from the Proposition 13 Watershed Protection Grant Program, allowed for Phase 2 and a great expansion of the program. Phase 3 is now underway with additional funding provided by Proposition 40 through the Nonpoint Source Pollution Control Program and the State Water Resources Control Board.
MAIN GOALS OF THE PROJECT
Maintain a Technical Advisory Group (PDF 56.2KB)
Control the Three Worst Invasive Plants
Conduct Project Monitoring
Provide Public Education and Outreach
U.S. Fish & Wildlife Service
U.S. Border Patrol
U.S. Geological Survey
National Oceanic & Atmospheric Administration
U.S. Boundary & Water Commission
California Fish & Game
California State Parks
California State Coastal Conservancy
California Coastal Conservancy
San Diego County Department of Parks & Recreation
San Diego County Department of Agriculture
City of San Diego
City of Imperial Beach
Boland Ecological Services
3504 Louisiana Street
San Diego, CA 92104
Ph.D. (Ecology) – University of California, Los Angeles
M.S. (Ecology) – San Diego State University
B.Sc. (honours in Zoology) – University of Cape Town, South Africa
Boland, J.M. 2006. The importance of layering in the rapid spread of Arundo donax
(giant reed). Madroño 53 (4): 303-312.
Boland, J.M. Layering: a ‘new’ mode of spread in Arundo donax (giant reed). California
Invasive Plant Council 15th Annual Symposium, Rohnert Park, CA. October 2006.