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Distribution of Aquatic Vegetation as Measured by Line Intercept with Scuba

Schmid, William D.
Ecology 1965 v.46 no.6 pp. 816-823
aluminum foil, aquatic plants, lakes, solar radiation, texture, vegetation, Minnesota
The aquatic vegetation of Long Lake (T 144 N, R 36, 37 W) in northwestern Minnesota was surveyed by means of line transects run underwater with SCUBA apparatus. Eight stations were established about the lake and 12 transects were run from each station. The transects were run along depth contours at ½—m depth and 1—m intervals from 1 through 11 m depth. No vegetation was observed deeper than 11 m. Each transect was 20 m long, and the presence of plant species was recorded at intervals of ⅓ m. The data were recorded underwater by writing on a sheet of aluminum foil held in a mental clipboard. The aquatic vegetation was more abundant on the southwest—facing slope than on the northeast—facing slope of the lake bottom. This difference has been attributed to a difference in solar insolation. Some of the significant interspecies correlations which were observed appeared to be related to water depth and the texture of the substrate.