Portland State University. Department of Environmental Science Management
Date of Award
Master of Science (M.S.) in Environmental Science and Resources
Environmental Science and Management
1 online resource (72 p.)
Purple loosestrife -- Biological control -- Columbia River Estuary (Or. and Wash.), Galerucella -- Columbia River Estuary (Or. and Wash.)
Galerucella pusilla and G. calmariensis have provided successful biological control of purple loosestrife (Lythrum salicaria L.) in non-tidal areas but only marginal control in areas of tidal influence. While a previous study identified mechanical scour by tidal waters as the main cause of establishment failure, purple loosestrife stem density explained more than 80% of the variability in presence and absence of Galerucella at my study sites in the Columbia River Estuary. A logistic regression model using purple loosestrife stem density, elevation, and their interaction as predictors accurately predicted 92.5% of Galerucella presence or absence observations of a test data set (n= 201). Field data also identified a critical threshold of approximately 32 purple loosestrife stems/m2 , above which Galerucella were present 100% of the time at the release sites.
Moore, Lynda Kathryn, "Biological control of purple loosestrife (Lythrum salicaria) : factors affecting Galerucella pusilla and Galerucella calmariensis establishment in tidal areas" (2009). Dissertations and Theses. Paper 3580.