Invasive plant species early detection in the San Francisco Bay Area Network: 2008 annual report.
Williams A and Jordan J. 2010. Invasive plant species early detection in the San Francisco Bay Area Network: 2008 annual report.. Natural Resource Technical Report. NPS/SFAN/NRTR—2010/308
The Golden Gate National Recreation Area contains 38 subwatersheds deemed at high risk of invasion and/or harm to significant biological resources, of which 33 subwatershed were within the boundaries actively managed by the park. Searches were conducted by teams of two or three along the prioritized trails and roads in these subwatersheds looking for up to 73 plant species ranked as having the greatest risk for invasion in these areas. One thousand and seventy-six high-priority plant populations were mapped in the park. The most common highest priority (List 1) species that were found were capeweed (Arctotheca calendula), tocalote (Centaurea melitensis), Scotch broom (Cytisus scoparius), and licorice plant (Helichyrsum petiolare). Of 80 subwatersheds searched in 2008, 45 were found to contain the highest priority species. Eighteen of these 45 subwatersheds were deemed at high risk for invasion. The Point Reyes National Seashore contains 78 subwatersheds total. Of these, 20 subwatersheds are determined to be at high risk of invasion and/or harm to significant biological resources. Eighteen of these high-priority subwatersheds were located within the boundaries actively managed by the park. There are also 20 significant-priority, 19 moderate-priority and 19 low-priority subwatersheds. Searches were conducted as in GOGA, but for an even larger list of 92 plant species ranked as having the greatest risk for invasion in these areas. Two hundred and seventy-four high-priority plant populations were mapped in the park. The most commonly found List 1 species were woolly distaff thistle (Carthamus lanatus), orange cotoneaster (Cotoneaster franchetii), and silverleaf cotoneaster (Cotoneaster pannosus). Of 33 subwatersheds searched, 12 were found to contain the highest priority species, four of which were deemed at high risk for invasion.
- Type
- Published Report
- Authors
- Williams, Andrea; Jordan, Jenn
- Date of Issue
- 2010-04
- Units
- GOGA , NRSS , PORE , SFAN
- Keywords
- Absence (Biodiversity), Annual Report, central california coast, Distribution (Biodiversity), Exotic Plants, Invasive Plant Species, Invasive Plants, Monitoring, Observations, Presence (Biodiversity), San Francisco