. The Canadian field-naturalist. 378 The Canadian Field-Naturalist Vol. 97 LUTHER MARSH. Figure I. Luther Marsh showing location of the study areas. were determined with the aid of a conventional pla- nimeter. The reservoir water level at the dam and the amount of precipitation were recorded by Grand River Con- servation Authority staff. Daily water depths in the total area of each study area, except East Bay, were recorded at 0, 5, 10, and 15 m on each side of the transect in May and early June. In East Bay, water levels were recorded every month at Muskrat houses. In late summer, three trans
. The Canadian field-naturalist. 378 The Canadian Field-Naturalist Vol. 97 LUTHER MARSH. Figure I. Luther Marsh showing location of the study areas. were determined with the aid of a conventional pla- nimeter. The reservoir water level at the dam and the amount of precipitation were recorded by Grand River Con- servation Authority staff. Daily water depths in the total area of each study area, except East Bay, were recorded at 0, 5, 10, and 15 m on each side of the transect in May and early June. In East Bay, water levels were recorded every month at Muskrat houses. In late summer, three transects were established between the shoreline and the back of East Bay and water depths were recorded every 2 m along each transect. These values, along with the reservoir water level at the dam, permitted determination of monthly water level fluctuations and delineation of regions, within the study area, with distinct water depths. The vegetation was analysed with the aid of per- manent m ^ m plots placed at random in each of the vegetation belts. In Western Shore and Teal Bay, the number of plots in a belt was proportional to the area covered by that belt. Therefore, 44 plots were inventoried in Western Shore (horsetail belt, 25; cat- tail belt, 12; sedge belt, 7) and 38 in Teal Bay (cattail belt, 25; spike rush belt, 13). The vegetation of the other habitats was treated as one belt and 25 plots were placed randomly in each habitat. Due to the size of East Bay, 100 quadrats were inventoried. The number of individual shoots of each taxon was counted in each plot. Two inventories were carried out in summer 1979; the first in late May-early June and the second in early July. In 1980, similar inventories were conducted with a third one in August. Consider- ing that some plants grow slower than others and that their representation was low in the May sample, only the July results were used to compare the floristic composition of the habitats. A similarity index between 1979 a
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