Comparative abundance-frequency assessment exampled by data from the Bergumermeer, a lake in the Netherlands

In the years 1969–1978 chemical and plankton samples were collected monthly in the Bergumermeer, province of Friesland. The samples were analysed by biologists of the KEMA, a company for testing of electrical equipment, who were interested in the environmental impact of heat discharge from the electricity power plant at the lake side. The observations were… (More)