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09/27/1990
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09/27/1990
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MV Parks, Recreation & Forestry Commission
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Packet
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Date
9/27/1990
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Elodea was found to be' the dominant macrophyte in shallow <br />water (i.e. 3 feet or less). In areas of deeper water, <br />water milfoil became dominant; however, when water depth <br />reached about 5 feet, water milfoil growth became very <br />sparse. Some sparse, scattered patches of sago pondweed <br />(Potamageton pectinatus) were also found in deeper water. <br />Overall, the composition of macrophytes within Silver View <br />Pond is not particularly diverse as would be expected of a <br />relatively shallow and recently created basin. <br />Silver View Pond also supports a number of species of algae, <br />the most visible of which is filamentous green algae of the <br />genus Ulothrix. Limited amounts of blue -green algae were <br />also observed. Since algal populations are important <br />indicators of the pond's water quality, a detailed <br />discussion of algae is contained in the water quality <br />section of this report. <br />B. Aquatic Wildlife Habitat Value <br />The wildlife habitat quality of the pond and its contiguous <br />wetlands is generally good. Because of its extensive <br />macrophyte growth and the associated high invertebrate <br />population, the pond supports a variety of waterfowl during <br />the spring, summer and fall. The primary waterfowl species <br />using the pond are mallards (Anas lat r nchos), wood ducks <br />(Aix sponsa) and Canada geese (Branta canadensis). <br />During the summer of 1988, we observed at least 3 mallard <br />and 2 wood duck broods on the pond at one time. This <br />unusually high density of waterfowl broods indicates that <br />Silver View Pond provides the high protein invertebrate diet <br />required by young waterfowl. However, it also suggests that <br />hens with broods were more concentrated due to drought <br />conditions in 1988. Since hens will often travel some <br />distance from the nest site to reach suitable brood habitat, <br />it appears that the pond may have been a "magnet" for hens <br />nesting some distance away. <br />While the pond provides an excellent food source for youn.- <br />waterfowl, the dominant macrophytes are not generally <br />considered high quality food for adult ducks. Waterfowl <br />food value ratings have been assigned by the Minnesota <br />Department of Natural Resources to the common aquatic plants <br />of Minnesota. Elodea, water milfoil and yellow water lilies <br />which dominate Silver View Pond are all rated as having <br />slight to fair waterfowl food value (Key to the Common <br />Aquatic Plants of Minnesota, Minnesota Department of Natural <br />Resources Special Publication No. 53; Carlson and <br />Moyle,reprinted 1973). White water lilies and lotuses have <br />no waterfowl food value. Sago pondweed which grows <br />sparingly in deeper water and spike rush which grows in <br />scattered patches on the pond margin are both rated as <br />75 <br />
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