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2007 "Volunteers Working With Invasives"
Grants Report Form

Display Report


Project Title: Control of the Invasive Perennial Pepperweed in Tidelands of San Pablo Bay
Region: 8
Station: San Pablo Bay NWR
Contact Person:
Name and Phone Number
Giselle Block, 707-769-4200
Project Description:
(Up to 250 words)
The objectives of this project are to reduce the cover of perennial pepperweed (Lepidium latifolium) and to restore native plant assemblages while providing education in tidal marshlands of San Pablo Bay. These actions will benefit many estuarine-dependent species, including the endangered salt marsh harvest mouse and endangered California clapper rail, and will increase the success of tidal marsh restoration efforts already underway and others that are in the planning stages. Goals for 2007-08: 1. Spring 2008-Conduct second year chemical treatment (imazapyr, imazapyr+glyphosate) of at least 50 acres of pepperweed 2. Expand pepperweed assessment and control area to 2,000 acres of tidal marsh. 3. Spring 2008-Assess 2007 treatment effects using WIMS 4. 2008-Adapt control plan as necessary following 1st year treatment assessments. 5. 2008-Propagate at least 3000 native plants and outplant in the marsh-upland transition zone of the project area 6. 2008-Engage school aged children (via the Bay Institutes STRAW program) and adults in native plant propagation and planting 7. Present project results at the CA Invasive Plant Council Conference, disseminate information to regional Weed Management Areas
List of Invasives Species Targeted:Common NameScientific Name
  perennial pepperweed Lepidium latifolium
Project Status: InProgress
Project Completion Date
or Estimated Completion Date:


Volunteer Affiliation:
(Check all that apply)
VA_FriendsGrp     VA_SchoolGrp                            VA_Other
Volunteer Involvement:
Describe the type of work the volunteers performed. (Up to 150 words)
Volunteers conduct pre- and post-treatment invasive mapping, assist with native plant propagation at the Refuge nursery, and outplant plant propagules. Invasive plant mapping is conducted with global positioning systems loaded with plant mapping software (WIMS or RLGIS). Volunteer work at the nursery includes seed germination and potting-up of germinates. Volunteers also assist with nursery maintenance (e.g., pot washing). Each volunteer event is accompanied by an educational component led by USFWS educators or local non-profits (e.g., the Bay Institute). Education subjects include invasive biology and estuarine ecology.
Total Number of Volunteers: expected number fall 2007 to spring 2008 = 130
Total Number of Volunteer Hours: expected hours fall 2007 to spring 2008 = 1,500
List both new and existing partnerships utilized in this project. (Up to 150 words).
Friends Groups, Volunteers and Other Partners: the following volunteers and partners have and will continue to assist with this project. Each group plays a vital role in the project: Refuge volunteers, Friends of San Pablo Bay NWR, Sonoma Land Trust, California Department of Fish and Game, Save the Bay, The Bay Institute.


Project Results:
Give an overview of the results of the project. Include quantifiable measure of success, such as maps produced, efficacy of control measures, number of sites where invasions were detected early and responded to, number of community contacts, etc. (Up to 250 words).
Results will be reported post-project (May-June 2008).
Number of Acres Treated: 100-200 acres of pepperweed in 2,000 of tidal marsh
Number of Acres Inventoried and/or Mapped: 2,000 acres
Number of Acres Restored: 100-200 acres


Budget: Account for funds in broad categories such as equipment, volunteer stipends, travel, coordinator salary/contract, etc.

Total Grant Amount:

$ 10,000

Breakdown of Expenditures:


Total $ Spent
% of Total Grant
Equipment / Supplies
Chemical 25,000 100
Biocontrol Agents
Volunteer Stipends
Volunteer Coordinator Salary/Contract 20,000 0
Restoration Materials 24,000 0
TOTAL 69,000 100

Recommendations: (OPTIONAL)
How useful was this program for meeting refuge invasive species objectives and how can it be improved?
The program is a great way to augment other funding sources, especially when multiple partners are involved. It shows that the Refuge can be an active partner who contributes funding as well as people power. This is a really simple method of reporting. Very easy. How do treated and restored acres differ above? If 100 acres are treated within a 1000 acre area, do we consider the 1000 acres as the "restored" acreage?


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