HomeMy WebLinkAbout2024 Nancy Lake POI Survey Report2024 Nancy Lake (DOW: 27067700, Hennepin County) Aquatic Vegetation Point Intercept Survey Report
4/8/2024
An aquatic vegetation point intercept survey was completed in Nancy Lake on 4/8/2024 for the City of Edina. Three species of vegetation were sampled during the survey:
Curlyleaf pondweed
Sago pondweed
Small pondweed spp.
The point intercept survey consisted of 25 points. A meandering delineation was also performed to detect any additional curlyleaf pondweed not in the proximity of a site. At each site
depth was recorded and vegetation was sampled with a double-sided rake. For every species sampled, an abundance rating was assigned based on how much was sampled on the rake. The ratings
are as follows:
Plant species absent
Plant species covers <25% of the rake
Plant species covers 25-75% of the rake
Plant species covers >75% of the rake
This rating scale was taken out of the Minnesota Department of Natural Resources Guidance for Delineating Aquatic Plants for Management.
Curlyleaf pondweed was not abundant in Nancy Lake (See figure 1). It was only found at 4 sites (frequency of occurrence: 16%) with an average rake abundance of 1 at sites where it was
collected.
Small pondweed spp was found at 1 site (frequency of occurrence: 4%) with an average rake abundance of 1 (see figure 2). Plant growth was immature and an accurate ID was not able to
be obtained.
Sago pondweed was found at 3 sites (frequency of occurrence: 12%) with an average rake abundance of 1 (see figure 3). Plant growth was emerging from sago pondweed seeds.
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Figure 1: Nancy Lake CLP distribution and abundance
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Figure 2: Nancy Lake small pondweed spp distribution and abundance
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Figure 3: Nancy Lake Sago Pondweed Distribution and Abundance