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2010 "Volunteers Working With Invasives"
Grants Report Form

Display Report


Project Title: Investigation of increased Azolla growth in Butte Sink WMA.
Region: 8
Station: Sacramento NWRC
Contact Person:
Name and Phone Number
Caig Isola 530-934-2801
Project Description:
(Up to 250 words)
Since 2005, private landowners and wetland managers have seen a dramtic increase in the growth of Mexican Water Fern (Azolla mexicana) on wetlands within the Butte Sink WMA. Preliminary research on Mexican Water Fern indicated that the primary control agent for waterfern, water fern weevils, experienced population crashes in the late spring and early summer. This project looks to use volunteers to help implement water monitoring efforts to determine if water quality may contribute to observed decreases in water fern weevil abundance. Water quality paramenters including temperature, dissolved oxygen, pH, conductivity, nutrient levels, pesticide levels and toxicity will be measured. Information from the water quality monitoring will be used to direct future research and management actions.
List of Invasives Species Targeted:Common NameScientific Name
  Mexican Water Fern Azolla mexicana
Project Status: Completed
Project Completion Date
or Estimated Completion Date:


Volunteer Affiliation:
(Check all that apply)
Volunteer Involvement:
Describe the type of work the volunteers performed. (Up to 150 words)
During the late Spring and early Summer of 2011 volunteers from the Wild Goose Duck Club and the Butte Sink Waterfowl Association will assist FWS staff in: 1) locating water monitoring locations, 2)constructing and installing water monitoring equipment,3)maintaining water monitoring equipment throughout the study, 4) collecting weekly grab samples of water, 5) determining weekly survival of insitu Hyaela sp., and 5)providing on site access (four wheel drive/boat)to monitoring locations.
Total Number of Volunteers: 3
Total Number of Volunteer Hours: 94.5
List both new and existing partnerships utilized in this project. (Up to 150 words).
Partners in the project include the Wild Goose Duck Club, Butte Sink Waterfowl Association, Ducks Unlimited (DU), California Waterfowl, USDA-Agricultural Research Service, and California Department of Fish and Game. In an important partnership, the FWS has entered into a Cooperative Agreement with DU, which enables DU to use project funds to acquire equipment and analytical services necessarry for the project. With this Cooperative Agreement, Ducks Unlimited has agreed to provide $3,124 of indirect overhead and in-kind services. The Wild Goose Duck Club has also agreed to provide up to $5,000 in in-kind services to implement the project.


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).
The project described water quality of the main water source entering Butte Sink wetlands in the late spring and early summer. The monitored water supply is the main source for a 20,000 acre wetland complex which includes over 10,000 acres of FWS Conservation Easements and 733 acres of FWS fee-title lands. This project acted as a pilot which provided preliminary water quality data and logisitcal/technical experience to help direct a larger comprehensive water quality investigation to be implemented in the Butte Sink starting in the Fall of 2011. Water quality parameters (DO,pH, Temp,Conductivity), chemical analysis (pesticide and nutrient levels) and toxicity (to insitu Hyaela sp.)were determined on a weekly basis from late-April thru late-June. This data has been recorded and will be further analyzed following additional data collection during Fall 2012. Data collected during this study and the following water quality investigation will be used to determine if water qualtiy is affecting the growth of Azolla.
Number of Acres Treated: 0
Number of Acres Inventoried and/or Mapped: 0
Number of Acres Restored: 0


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

Total Grant Amount:

$ $20,500.00

Breakdown of Expenditures:


Total $ Spent
% of Total Grant
Equipment / Supplies $9,771.79 47.7%
Chemical 0 0
Biocontrol Agents 0 0
Travel 0 0
Volunteer Stipends 0 0
Volunteer Coordinator Salary/Contract 0 0
Restoration Materials 0 0
Other $9,926.28 48.4%
TOTAL $19,698.07 96.1%

Recommendations: (OPTIONAL)
How useful was this program for meeting refuge invasive species objectives and how can it be improved?
This was a very useful program that helped provide needed data that will ultimately affect the management of invasive Azolla in the butte sink.


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