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In general, the less dominant the exotic species and the broader the diversity of native species, <br />the healthier the lake system <br />Following are the conclusions of the aquatic vegetation survey: <br />• There was no evidence of either eurasian water milfoil or curly leaf pondweed, <br />the two most problematic exotic submergent plant species. <br />• The lake is shallow enough and the water clear enough during most of the <br />summer to support good growths of native submergent vegetation throughout the <br />lake. Many of the species noted during the surveys are important for wildlife food <br />and cover. <br />• There is a moderately good diversity of native submergent plant species. All <br />told, six species of native submergent aquatic plants were observed including <br />Canadian waterweed, coontail, flat stem pondweed, slender niad, and the native <br />northern water milfoil. <br />• The emergent community also appears to be in moderately good shape, <br />especially in the middle cell of the lake where some stands of arrowhead, hardstem <br />bulrush, and water plantain were observed. <br />• The northern cell was almost completely covered by various species of <br />pond /water lilies, probably due to the fact that it is the most shallow of the three cells <br />and receives the most (untreated) runoff. <br />• Cattails dominate the inshore areas in various spots along the lake shoreline. <br />These species are aggressive, but it is unclear whether the areas that they dominate <br />are expanding, staying about the same, or contracting. <br />In a historical context, the most significant finding is that the diversity of the aquatic plant <br />species — and consequently the general health of the aquatic system — appears to have improved <br />significantly since the 1970's. A field survey of the lake conducted in 1976 and cited in the <br />Environmental Assessment of the proposed Hyman Freightways truck terminal south of the lake <br />(City of Roseville, 1976) indicates that only one species of native submergent plant and two <br />species of emergent plants were found. The emergent species identified were narrow - leafed <br />City of Roseville 44 <br />Parks Natural Resource Management <br />