Changes of water quality and sediment phosphorus of a small productive lake following decreased phosphorus loading

Heaney, S.I. and Corry, J.E. and Lishman, J.P. (1992) Changes of water quality and sediment phosphorus of a small productive lake following decreased phosphorus loading. In: Sutcliffe, D.W. and Jones, J.G. (eds.) Eutrophication: research and application to water supply. Ambleside, UK, Freshwater Biological Association, pp. 119-131. (FBA Special Publications,3)

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Abstract

Esthwaite Water is the most productive or eutrophic lake in the English Lake District. Since 1945 its water quality has been determined from weekly or biweekly measurements of temperature, oxygen, plant nutrients and phytoplankton abundance. The lake receives phosphorus from its largely lowland-pasture catchment, sewage effluent from the villages of Hawkshead and Near Sawrey, and from a cage-culture fish farm. From 1986 phosphorus has been removed from the sewage effluent of Hawkshead which was considered to contribute between 47% and 67% of the total phosphorus loading to the lake. At the commencement of phosphorus removal regular measurements of phosphorus in the superficial 0-4 cm layer of lake sediment were made from cores collected at random sites. Since 1986 the mean annual concentration of alkali-extractable sediment phosphorus has decreased by 23%. This change is not significant at the 5% level but nearly so. There has been no marked change in water quality over this period. Summer dominance of blue-green algae which arose in the early 1980s after decline of the previous summer forms, Ceratium spp., has been maintained. Improvement in water quality is unlikely to be achieved at the present phosphorus loading.

Item Type: Book Section
Title: Changes of water quality and sediment phosphorus of a small productive lake following decreased phosphorus loading
Personal Creator/Author:
CreatorsEmail
Heaney, S.I.
Corry, J.E.
Lishman, J.P.
Title of Book: Eutrophication: research and application to water supply
Editors:
EditorsEmail
Sutcliffe, D.W.
Jones, J.G.
Refereed: No
Series Name: FBA Special Publications
Number: 3
Page Range: pp. 119-131
Date: 1992
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
ISBN: 978-0900386-52-7
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Eutrophication; Freshwater lakes; Limnological surveys; Phosphorus; Phytoplankton; Primary production; Sediment analysis; Water quality; England; Esthwaite Water
Subjects: Chemistry
Limnology
Pollution
Item ID: 5293
Depositing User: Hardy B Schwamm
Date Deposited: 10 May 2011 13:13
Last Modified: 29 Sep 2011 15:08
Related URLs:
URI: http://aquaticcommons.org/id/eprint/5293

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