Oligotrophication and eutrophication tendencies in some dutch moorland pools, as reflected in their desmid flora

摘要: An inventory of the desmid flora in a number forest and moorland pools, carried out 1975, revealed that an appreciable impoverishment has occurred since turn century. In those pools which are immediately surrounded by arable land pastures or connected with cultivated areas small streams, deterioration is caused eutrophication pollution aquatic environment. hydrologically isolated situated within nature reserves, decline must be attributed to acidification oligotrophication site. The latter phenomenon may associated much increased acid deposition atmospheric precipitation owing air pollution, as recorded Netherlands especially last decennia.