Laserfiche WebLink
January 26,2024 <br /> Don Peterson <br /> Page 8 of 21 <br /> Reference: Water Quality Assessment of Silver View Pond,Mounds View,MN <br /> Table 5. Aquatic plant taxa and littoral frequency of occurrence in Silver View Pond. <br /> June 26th/ <br /> Taxa Common Name 27th, 2023 August 31st,2023 <br /> Early ! Late Season <br /> Season <br /> • <br /> SUBMERSED TAXA <br /> Nymphaea odorata American white waterlily 49 55 <br /> Nuphar variegata Bullhead pond-lily 1 -- <br /> Chara sp. Stonewart 46 38 <br /> Elodea canadensis Canadian waterweed 9 12 <br /> Ceratophyllum demersum Coontail 45 44 <br /> Potamogeton zosteriformis Eel-grass pondweed 6 3 <br /> Potamogeton foliosis Leafy pondweed -- 2 <br /> Potamogeton pusillus Small pondweed 37 3 <br /> Stuckenia pectinata Sago pondweed 3 3 <br /> FLOATING TAXA <br /> Lemna trisulca Ivy-leaved duckweed 13 23 <br /> Lemna minor Small duckweed 96 58 <br /> Wolffia sp. Watermeal 81 58 <br /> • <br /> Spirodela polyrhiza Large duckweed 97 59 <br /> Utricularia vulgaris Common bladderwort 1 6 <br /> EMERGENT TAXA <br /> Typha sp. Cattail -- -- <br /> Sagittaria sp. Arrowhead -- -- <br /> Schoenoplectus acutus Hardstem bulrush -- -- <br /> Note that at some points in the late season survey, watermeal was at 100% coverage on the surface of the <br /> water. However, watermeal. coverage on the rake tow was lower at these points, so the rake tow values <br /> were incorporated into the statistical analyses per the protocol. <br /> Sediment Phosphorus Chemistry <br /> Phosphorus release rates under oxic and anoxic conditions are shown in Figure 3. Rates over 2 mg/m2-d <br /> are considered high and may indicate the need to implement actions to reduce release of phosphorus from <br /> pond sediments. Anoxic release rates were higher than oxic release rates in Silver View Pond, which is <br /> typical. Anoxia-driven phosphorus release is due to reduction of iron that is bound to phosphorus,which <br /> causes the bonds to break and allows dissolved phosphorus to diffuse from the sediments. Oxic release is <br /> typically driven by aerobic decomposition of organic matter where dissolved phosphorus is released in the <br /> process. Station 3 had nearly equal rates of anoxic and oxic release which is a function of the high <br /> Design with community in mind <br />