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January 26,2024 <br /> Don Peterson <br /> Page 7 of 21 <br /> Reference: Water Quality Assessment of Silver View Pond,Mounds View,MN <br /> There are no widely established metrics for the quality of the vegetation community in stormwater ponds, so <br /> we compared the Silver View Pond macrophyte data to established vegetation metric thresholds for shallow <br /> lakes to understand the general quality and diversity of the existing in-pond plant community(Table 4). <br /> Species richness is an ecological measure of the number of different species found in a system.Another <br /> common metric for aquatic plants is the floristics quality index (FQI). The metrics calculated for Silver View <br /> Pond exceed the species richness and FQI thresholds for shallow lakes', which points to a diverse <br /> community of aquatic plants in Silver Pond. Diversity of plant species is particularly good from an ecological <br /> perspective as this provides different habitat and food resources for a wider range of species that depend <br /> on those resources. <br /> Table 4. Silver View Pond SAV metrics from early and late season surveys 2023. <br /> LAKEWIDE METRICS June 27th &28th,2023 August 31st, 2023 <br /> Early Season Late Season <br /> Total Points Sampled 67 66 <br /> Total Littoral Points Sampled 66 66 <br /> % Littoral with Veg 98.5 97 <br /> Max depth of plant growth(ft) 8 12 <br /> Shallow Lake Species Richness 11 <br /> Threshold <br /> Species Richness 13 13 <br /> Shallow Lake Floristic Quality 17.8 <br /> Index(FQI) Threshold <br /> FQI 19.6 19.2 <br /> Simpson's Diversity Index 0.86 0.87 <br /> The frequency of occurrence is a measure of the number of a times a particular species appeared in a <br /> sampling point on the grid. The taxa observed at each point and the relative frequency of occurrence for <br /> each taxa are shown in Table 5. In general, no emergent taxa were observed. American white lily, <br /> stonewart, and coontail were the dominant submersed taxa found. American white lily provides food <br /> resources and habitat for waterfowl and is typically not removed from aquatic systems in Minnesota4. <br /> Removal of the lily would likely allow for denser growth and expansion of native species like stonewart and <br /> coontail, which can grow to nuisance conditions and have high frequency of occurrence in Silver View Pond <br /> currently. <br /> 3 Radomski, P., and D. Perleberg. 2012. "Application of a versatile aquatic macrophyte integrity index for <br /> Minnesota lakes."Ecological Indicators 20: 252-268. <br /> 4 https://www.dnr.state.mn.us/aquatic_plants/floatingleaf_plants/white_water_lily.htnn I <br /> Design with community in mind <br />