Slide 1
Identify if Creeks are nutrient limited
Nutrient concentrations control stream food web productivity
Historically
Determine whether Nitrogen and/or Phosphorus limits autotrophic and/or heterotrophic biofilms
Design and Data collection
Slide 7
Study Area
Discharge
Discharge
Canopy coverage
Leaf Litter
Streams had more algal biomass in the summer compared to the fall
(2-way ANOVA, p=0.031)
Iron Creek
Hovey Creek
Limitation is co-limited by nitrogen and phosphorous
Acknowledgments
Many thanks to CWU Undergraduate Research Grant and Mid Columbia Fisheries Enhancement Group who made this research possible.
Ambrose H.E., Wilzbach M.A. & Cummins K.W. 2004. Periphyton response to increased light and salmon carcass introduction in northern California streams. Journal of the North American Benthological Society 23:701–712.
Slide 19