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In �eneral, the less dominant the cxotic species and the broader the diversity of native species, <br />the healthier the lake system <br />Foliowing are the conclusions of the aquatic vegetation survey: <br />• There was no evidence of either eurasian water miifoil or curly leaf pondweed, the <br />two most problematic exotic subzzzergent plant species. <br />• The lake is sha�low enough and the water clear e�ough during most of the summer to <br />support good growths of native submcrgcnt vegetation throughout the lake. Many of <br />the species noted during thc surveys are important for wildiife food and cover. <br />• There is a moderately good diversity of native subrnergent plant species. All told, six <br />species of native submergent aquatic planCs were observed including Canadian <br />waterweed, coontail, flat stem pondwecd, slender niad, and the native northern water <br />milfoil. <br />• The emergent community also appears to be in moderately good shape, especially in <br />the middle cell of the lake where some stanc�s of arrowhead, hardstem bulrush, and <br />water plantain were observed. <br />• The northern ceil was almost compietely covered by varions species of pond/water <br />lilies, probably due to the fact that it is the rnost shallow of the three cells and <br />receives the most {untreated) runoff. <br />� Cattails dominate the inshore areas in various spots alon� thc Iake shorclinc. These <br />species are aggressive, but it is unclear whether tt�e areas that they dominate are <br />expanding, staying about the same, or contracting. <br />In a l�istorical context, the most significant finding is that the diversity of the aquatic plant <br />species — anc� consequently the general health of the aquatic system — appears to have improved <br />si�nificantly since the 1970's. A field survey of the lake conducted in I976 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 wcre narrow-leafed <br />cattail and reed canary grass, both of which are ag�ressive invasive spccics not native to this <br />area. <br />Ctty Of ROSCVIl�e `%7 <br />Yarks Nattrr�tl Resn«rce Mai2age�iee�tt <br />