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By Jay A. Bloomfield
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Additional resources for Ecology of the Lakes of East-Central New York
Example text
Spatial trend of surface total phosphorus (ju,g/liter) in Otsego Lake, sum mer, 1975. From Doremus (1975). 1935 Biological Survey (NYS Conservation Department, 1936) showed alkalin ity levels in Otsego Lake during June and July indicative of similar conditions (8-10 mg/liter bicarbonate carbon). 2 mg/liters of C0 2 -C at the lake bottom (51m). Some additional plant-nutrient data can be found in Table 13, which is a summary of the chemistry of the Village of Cooperstown water supply collected February 28, 1972.
Between 1972 and 1977 an increase in transparency became evident. Harman and Doane (1970) recognized differences in the distribution patterns of rooted aquatic vascular plants associated with decreasing conpensa ti on levels. Sohacki (1972) reported a greater than 50% increase in seston since 1935. The 1975 data indicate an even greater increase. Otsego Lake has a color typical of a deep oligotrophic lake with high concen trations of calcium carbonate. The waters appear blue-green in color throughout the year with the exception of late August, when blue-green algal blooms occa sionally turn the water a translucent pea green.
It then collapsed to the substrate and decomposed. In June and July two definite layers of vegetation were present at this depth. Potamogston crispus formed a diffuse overstory while N. flexilis composed a dense understory. From August on into the winter N. flexilis was the only species present at the site (Fig. 25). The macrophytes studied can be separated into four groups according to their morphology during the winter season. These characterize the appearance of the substrate during this period and provide food and cover for benthic organisms.