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The Crustacean Zooplankton of Grasmere Before and After a Change in Sewage Effluent Treatment
Author(s) -
Smyly W. J. P.
Publication year - 1978
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19780630307
Subject(s) - hypolimnion , limnetic zone , zooplankton , profundal zone , crustacean , effluent , malacostraca , plankton , sewage , ecology , environmental science , oceanography , biology , eutrophication , littoral zone , geology , environmental engineering , nutrient , decapoda
The limnetic crustaceans of Grasmere, a small lake in the English Lake District, were studied from February 1969 to December 1970 (23 months) and from January to December 1975. These observations were made before and after a change in sewage effluent treatment effected in May 1971. Planktonic species, except for one cladoceran, were more abundant in the second than the first period, while hypolimnetic and profundal forms either became less abundant or modified their life‐style in conjunction with a developing hypolimnetic oxygen‐deficit.