Environmental control and limnological impacts of a large recurrent spring bloom in Lake Washington, USA.. Arhonditsis 1, M.T.Brett 1, D.E. Schindler 2.

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Presentation transcript:

Environmental control and limnological impacts of a large recurrent spring bloom in Lake Washington, USA.. Arhonditsis 1, M.T.Brett 1, D.E. Schindler 2 and J.Frodge 3 1 Department of Civil and Environmental Engineering, University of Washington, Seattle, USA 2 Department of Zoology, University of Washington, 404 Seattle, Washington, USA 3 King County Department of Metropolitan Services, Seattle, Washington, USA

Aims of the study Quantitative assessment of the spatial vs temporal variabilityQuantitative assessment of the spatial vs temporal variability Identification of the best predictors for phytoplankton dynamics over the annual cycleIdentification of the best predictors for phytoplankton dynamics over the annual cycle

Land Uses in the Watershed

Vol.Wt. Chlorophyll (ug/l) Vol.Wt. Temperature (oC) Temperature Chlorophyll Phyto Growth Time of the year

Multivariate Analysis of Variance

Time Series Analysis

Principal Component Analysis

Multiple Regression Models VARIABLESLAGCOEFFICIENTS R 2 partial R2R2 Solar Radiation % Intercept %

VARIABLESLAGCOEFFICIENTS R 2 partial R2R2 Cladocerans % % Total Phosphorus % Intercept

Bayesian Analysis

Conclusions Phosphorus limiting element for primary productionPhosphorus limiting element for primary production Temporal fluctuations 40 % of the total variabilityTemporal fluctuations 40 % of the total variability Spatial heterogeneity 10 % of the total variability Spatial heterogeneity 10 % of the total variability Interactions of space with time 10 % of the total variability Interactions of space with time 10 % of the total variability Basic regulatory factors of spring bloom dynamics:Basic regulatory factors of spring bloom dynamics: 1 st phase Solar radiation 1 st phase Solar radiation 2 nd phase Epilimnion phosphorus stock 2 nd phase Epilimnion phosphorus stock Zooplankton grazing pressure (Daphnia populations) Zooplankton grazing pressure (Daphnia populations)

Acknowledgements METRO King County (database )METRO King County (database ) A.W Mellon Foundation and Dr. Daniel E. Schindler, Department of Zoology, University of Washington (database )A.W Mellon Foundation and Dr. Daniel E. Schindler, Department of Zoology, University of Washington (database )