2017 Aquatic Plant Survey: Silver Lake (WBIC# )

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1 Aquatic Plants in Silver Lake; Hennepin County, MN August Creekside Lane Osseo, MN 5569 (65) Aquatic Plant Survey: Silver Lake (WBIC# ) Surveyed August, 07 Surveying, Analysis, and Reporting by: James A. Johnson Freshwater Scientific Services, LLC Prepared for Riley Purgatory Bluff Creek Watershed District September 07 0, Freshwater Scientific Services, LLC Page of.

2 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Survey & Analysis Methods Point-Intercept Survey Freshwater Scientific Services, LLC surveyed the aquatic plant community of Silver Lake (Hennepin Co., MN) on August, 07 using the point-intercept survey method described by Madsen (999). This survey incorporated assessments at sample points arranged in a uniform grid (50-m spacing) across the entire lake (Figures and ). At each designated sample location, we collected plants using a -tine rake on an extendable pole. For each rake sample, we dragged the rake over the lake bottom for approximately 5 ft before retrieving. Retrieved plants were piled on top of the rake head and assigned density scores from to based upon rake head coverage (Figure ) for each individual species and for all plants collectively. We calculated the littoral frequency ( 5 ft, % occurrence) and littoral mean plant abundance (density score) for each encountered plant species, as well as bay-wide and littoral community metrics (Tables and ). Plant species that were observed growing within 0 ft of a sample point but not retrieved on the rake were given a rating of zero for that location. These zero species were noted as being present, but these zero ratings were excluded from calculations of plant community metrics and statistics (not treated as denoting presence). At each location, we also documented water depth and overall plant height. Figure. Sampled points for Silver Lake in 07 Figure. Sampling effort (number of locations sampled) within successive -ft depth zones. (Silver Lake, 07) 07 Freshwater Scientific Services, LLC Page of...

3 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Results Statistical Summary of Aquatic Plant Community in Silver Lake Table. Littoral frequency (% occurrence) and abundance (mean density score) of plant species found during the 07 survey of Silver Lake. % Occurrence and mean density (0- scale) were calculated using all littoral points (water depth 5 ft). P denotes taxa that were observed growing but not retreived in any rake samples. PLANT TAXA COMMON NAME % Occurrence Littoral Density ALL TAXA (combined) 96. SUBMERSED TAXA Ceratophyllum demersum Coontail 9. Elodea canadensis Canadian waterweed 60. Potamogeton zosteriformis Flat-stem pondweed Stuckenia pectinata Sago pondweed 8 0. Potamogeton foliosus Leafy pondweed <0. Aquatic Moss Aquatic moss <0. Najas flexilis Slender naiad <0. Utricularia vulgaris Common bladderwort <0. Potamogeton crispus* Curly-leaf pondweed <0. FLOATING/EMERGENT TAXA Nymphaea odorata White waterlily Lemna trisulca Star duckweed Spirodela polyrhiza Large Duckweed 6 0. Lemna minor Small duckweed 0. Zizania palustris Northern wild rice <0. Typha sp. Cattail <0. Lythrum salicaria* Purple loosestrife P Phragmites australis Common reed P * Aquatic invasive plant Appears to be native Phragmites 07 Freshwater Scientific Services, LLC Page of...

4 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Table. Summary of plant community metrics for the 07 survey conducted on Silver Lake SURVEY RESULTS 07 LAKE-WIDE METRICS Lake Area (acres) 6 Total Points Sampled 99 % Lake Vegetated 96% % Lake with Veg. to Surface 58% Max Depth of Growth (95%) 6.7 ft # Native Taxa 5 # Non-Native Taxa LITTORAL METRICS ( 5 ft) Littoral Area (acres) 6 Littoral Points Sampled 98 % Littoral Points Vegetated 96% Mean Littoral Plant Height (ft). ft % of Max Littoral Biovolume 77% Mean Native Taxa / Point.8 Simpson s Diversity 0.85 Floristic Quality (FQI) 5.8 AMCI Score 9 Figure. Rake density scores used to assess plant abundance during point-intercept surveys 07 Freshwater Scientific Services, LLC Page of...

5 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Aquatic Plant Community All Vegetation Density (-) X No plants N Native Plant Diversity Number of Native Species per Point X None Surveyed: August, 07 Methods: Rake, Sonar, Depth Rod Surveyor: JA Johnson 07 Freshwater Scientific Services, LLC Page 5 of...

6 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Invasive Aquatic Plants Curlyleaf Pondweed (post-senescence) % Occurrence Density (-) Abundance Purple Loosestrife Density (-) 07 Freshwater Scientific Services, LLC Page 6 of...

7 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Native Submersed Aquatic Plants Coontail % Occurrence Density (-) Abundance Canadian Waterweed (Elodea) Density (-) % Occurrence Abundance 07 Freshwater Scientific Services, LLC Page 7 of...

8 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Native Submersed Aquatic Plants Flat-Stem Pondweed % Occurrence Density (-) Abundance Sago Pondweed % Occurrence Density (-) Abundance 07 Freshwater Scientific Services, LLC Page 8 of...

9 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Native Submersed Aquatic Plants Leafy Pondweed Aquatic Moss Density (-) Slender Naiad Common Bladderwort Density (-) 07 Freshwater Scientific Services, LLC Page 9 of...

10 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Native Floating Aquatic Plants White Waterlily Star Duckweed Density (-) Giant Duckweed Small Duckweed Density (-) 07 Freshwater Scientific Services, LLC Page 0 of...

11 Aquatic Plants in Silver Lake; Hennepin County, MN August 07 Silver Lake Native Emergent Aquatic Plants Northern Wild Rice Cattail Density (-) Common Reed (Phragmites)* Common Reed * * Appears to be native variant References Madsen JD Point intercept and line intercept methods for aquatic plant management. APCRT Technical Notes Collection. U.S. Army Engineer Research and Development Center, Vicksburg, MS. Nichols SA, Weber S, Shaw B A proposed aquatic plant community biotic index for Wisconsin Lakes. Env Manage 6: Freshwater Scientific Services, LLC Page of...

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