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Growth of macrophytes in Cook's Bay, Lake Simcoe

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Title: Growth of macrophytes in Cook's Bay, Lake Simcoe
Author: Neil, John H.; Graham, Jeff; Warren, Jeff
Abstract: In 1987, the Cook's Bay macrophyte community was surveyed to provide a comparison to the 1984 macrophyte survey results to determine if reduced nutrient input to Cook's Bay had produced changes in macrophyte growth. The 1987 survey followed closely the methodology used in the 1984 survey. An addition to the 1987 survey was the collection of macrophytes from different trophic areas of Lake Simcoe to determine if plant tissue nutrient content reflected the nutrient availability of those areas. Areal coverage of both discontinuous and continuous macrophyte growth increased from 1984. Coverage of continuous growth increased by 81 ha while discontinuous growth coverage increased by 105 ha. Total areal coverage of macrophytes was estimated to be 1,139 ha. Total macrophyte biomass increased by 55% from 1984 to 1987. Phosphorus and nitrogen tissue content of various macrophyte species was 0.21% and 2.20%, respectively, on an ash free, dry mass basis which was a decrease of 41% and 25%, respectively, as a response to decreased nutrient input to Cook's Bay. Macrophyte species from Georgina Island and Atherley Narrows showed no difference in nutrient content compared with the same species from Cook's Bay. Data suggests that nutrient availability to the plants is now uniform throughout the lake. Evidence of the presence of the caterpillar moth, Acentria nivea, believed to be responsible for the reduction of milfoil in the Kawartha Lakes was not found on macrophytes from Cook's Bay, Atherley Narrows or Georgina Island. The unknown "fine leaf" pondweed reported in the 1984 survey was identified as Potamogeton pectinatus.
Date: 1988
Rights: Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
Rights Holder: Queen's Printer for Ontario
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