Limnological data on a Dutch moorland pool through sixty years
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During the last 60 years changes have taken place in the pH, the macroflora and the microflora.
The microflora is the first to react upon the changes in the environment.
The macroflora reacts as well, albeit later.
The fauna seems to have a wider tolerance and has not been inflicted up to now.
The changes observed indicate an acidification and a certain disturbance with eutrophying elements. There are some indications that the decrease of pH of rainwater be the underlying factor for the acidification.
The disturbance with eutrophying elements is more difficult to explain. There have been some very dry summers, in which hardly any water was left in the ‘ven’. Furthermore, an increasing activity of roedeer and boars may have damaged the shore vegetation. This fact, in combination with the fate of plants in dry summers, brings into the water higher quantities of nutrients than usually.
KeywordsMoorland Pool Limnological Data Shore Vegetation Steep Shore Dytiscid Beetle
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- LEENTVAAR, P. (ed.), 1979. Verslag van de hydrobiologische waarnemingen in de Gerritsfles en Kempesfles op 2 en 3 november 1977., RIN-rapport. Rijksinstituut voor Natuurbeheer, Leersum., (unpubl. rep.; in Dutch).Google Scholar