Distribution and Biomass of Macrophytes Growing Near Streams.

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Presentation transcript:

Distribution and Biomass of Macrophytes Growing Near Streams

North End Graywood U.S.D.A. Project Macrophyte Study Sites Experimental Controls Beds dominated by milfoil near stream outlets

Eagle Point Long Point Old Orchard Point McPherson Point Sand Point

McPherson Point Gully Long Point Long Pt. Cove Hartson Point Cottonwood Cove

Sutton Point

Macrophyte Studies Project Goals: Monitor changes in biomass and standing crop, focusing on areas dominated by Eurasian watermilfoil near streams. Establish the relationship between nutrient loading, macrophyte biomass and standing crop Characterize changes in areas associated with control and experimental watersheds to determine the effectiveness of BMPs in reducing plant growth.

Graywood Gully #1 #2 Transects #3 2-4 quadrat samples collected by divers at 1, 2, 3, 4 m Swimmer tracks the perimeter of the milfoil while boat with Trimble GPS operator follows Plants are separated by species and weighed

August 2003 Average and S.D. for all sites. Each number is average of 2-4 quadrats.

Comprehensive data set now includes four summers.

Comparison of August Biomass Over Last Three Years 2001 vs vs vs. 2003

Changes in the distribution of Eurasian Watermilfoil within individual beds such as Graywood gully 1m 2m 3m 4m Stream 1m 2m 3m 4m Central 1m 2m 3m 4m North Stations are m apart along shore NM = no milfoil

Annual Changes in Milfoil Bed Surface Area

Annual Changes in Bed Surface Area W 2001 W 2002

Annual Changes of Standing Crops in Milfoil Dominated Areas W 2001 W 2002

Relationship of Macrophyte Standing Crop to Average Daily Loading for USDA watersheds

Eagle Point Long Point Old Orchard Point McPherson Point Sand Point

Loading Prediction Curves for Long Point Cove and North Gully

Relationship of Standing Crop to Total Phosphorus Loading by Streams, Summer 2003

Progress: Better understanding of dynamic nature of milfoil growth Established possible cyclical pattern of bed growth Loading prediction curve for Long Pt. Cove Continued to document statistically significant relationship between stream loading of TP and standing crop Goals for 2004: North McMillan loading prediction curve Refine estimates of standing crops Comparison of trends in experimental and control beds Seasonal changes in sediment nutrient levels