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LAKES <br />Shallow Open Water — These communities generally have water depths of approximately 2 <br />meters (6.6 feet). Submergent, floating and floating- leaved aquatic vegetation including <br />pondweeds, water - lilies, water milfoil, coontail, and duckweeds characterize this wetland type. <br />They differ from shallow and deep marshes in that they are seldom, if ever, drawn down. As a <br />result, emergent aquatic vegetation has little opportunity to establish. <br />These communities provide important habitat for waterfowl, furbearers, fish, frogs, turtles, and <br />aquatic invertebrates. They are also important aesthetic and recreational resources, particularly <br />for cities. The deeper portions of Langton Lake and Bennett Lake fall into this category, with <br />shallower portions better fitting the shallow and deep marsh community types. <br />OTHER PLANT ASSEMBLAGES <br />Although the plant assemblages described below may not be considered natural communities <br />under the methods used during this Natural Community Inventory in the sense that they are <br />assemblages of plants "created" through human activity and may not consist of plants native to <br />the area. However, they may provide important habitat for many generalist species such as <br />white -tail deer. They can also be aesthetically important in the landscape, providing buffers <br />from developed areas. In some cases, such as an old field, there may be opportunity to <br />reconstruct a natural community such as mesic prairie that has been lost in Roseville. <br />Conifer Plantation - Large plantations of conifers were often planted in the 1930s under the <br />belief that they prevent erosion. Often, these are single species groves of various pines and <br />spruces, planted closely together in rows. When young, the ground cover continues as a field or <br />prairie, as it was previously. Eventually, the shade created by the pines, and the acid from <br />needle -drop eliminate most ground cover vegetation and it becomes highly simplified or bare <br />until it is colonized by plants tolerant of these conditions. The plantations provide wind <br />protection, cover, and breeding areas for songbirds, owls and other species, but also create a <br />dense monoculture with low diversity. Depending on the original planting density, these <br />plantations typically require thinning with age to preserve the health of the trees. <br />City of Roseville 20 <br />Parks Natural Resource Management <br />