> as lemmas

1947 A. D. Hasler in Ecology 28 383/1 Enrichment of water, be it intentional or unintentional, is called eutrophication... In this paper eutrophication will be interpreted in the broadest sense; namely, lake enrichment owing to any and all nutritive substances.

1947 A. D. Hasler in Ecology 28 390/1 Eleven oligotrophic and dystrophic lakes have taken on eutrophic characteristics since comparatively recent times. Most rapid eutrophication has taken place in regions where there are deposits of postglacial clay;..the process has been accelerated by ‘cultural influences’ such as effluents from flax retting plants,..barnyards, fertile soil, urban settlements.

1967 Technol. Week 23 Jan. 70/3 Lake Erie's eutrophication.

1968 Observer 17 Nov. 9/4 Decaying plant matter consumes all the oxygen in the water, which becomes lifeless... This process of ‘eutrophication’ (or over-fertilisation) has overtaken at least 40 lakes in Britain and the US.

1970 Motor Boat & Yachting 16 Oct. 25/1 Eutrophication (dense growth of weed) tends to occur in enclosed areas of water.