| Title |
Evaluation of Sampling Design for Monitoring Impacts of the Control of Exotic Eelgrass on Native Eelgrass in Willapa Bay, Washington
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| Publication number |
Date Published |
| 13-10-054 |
December 2013 |
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Evaluation of Sampling Design for Monitoring Impacts of the Control of Exotic Eelgrass on Native Eelgrass in Willapa Bay, Washington (Number of pages: 27) (Publication Size: 1209KB)
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| Author(s) |
Grue, Christian and Grassley, James |
| Description |
In 2012, the Washington State Noxious Weed Control Board listed Japanese eelgrass (Zostra japonica) as a Class C weed allowing the shellfish growers within Willapa Bay to request a NPDES permit to use herbicide to control the grass on commercial clam (Ruditapes philippinarum) beds. Assuming the proposed permit is adopted, treatments would begin in May and June 2014. A condition of the permit will be the monitoring of impacts to adjacent native eelgrass (Zostra marina). The specified monitoring protocols were developed, prior to conducting the study, to detect a 20% reduction in either shoot density, shoot length, or percent cover based on assumptions of the presence and characteristics of the plant. However, whether or not this level of sensitivity will be able to be achieved in the field with the study sites available was not known. We applied the proposed monitoring design to selected study sites in May-June 2013, during the time period monitoring would occur in 2014, to ensure that monitoring objectives would be met. We found that, for the study sites monitored, the monitoring design would be able to detect a 20 percent reduction in the two metrics at an alpha of 0.10 and a power of 0.80. |
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| Contact |
Nathan Lubliner at 360-407-6563 or nathan.lubliner@ecy.wa.tov |
| Keywords |
Zostra marina, eelgrass, Zostera japonica |
| WEB PAGE |
Draft General Permit for Zostera japonica Management on Commercial Clam Beds in Willapa Bay |
| DISCLAIMER |
This material was not produced by the Department of Ecology, but is directly related to the agency's work. |
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