The control of indirect effects of biomanipulation

Benndorf, J. (1992) The control of indirect effects of biomanipulation. In: Sutcliffe, David W. and Jones, J. Gwynfryn (eds.) Eutrophication: research and application to water supply. Ambleside, UK, Freshwater Biological Association, pp. 82-93. (FBA Special Publications,3)

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Results from long-term investigations on biomanipulation show that indirect effects are at least as important as direct effects are for the stability of biomanipulation. Three types of indirect effects can be distinguished: (1) a change in quantity or quality of the resource base, (2) behavioural change of the prey, and (3) development of anti-predator traits. Although indirect effects of type (2), (e.g. a change in the pattern of vertical migration of zooplankton), and type (3), (e.g. development of helmets and neck teeth in Daphnia), are important mechanisms, the most essential indirect effects regarding biomanipulation belong to type (1). An example of the latter will be demonstrated: the complex of indirect effects of enhanced grazing by large herbivores on the phosphorus metabolism of the lake. It is concluded that control of the indirect effects is absolutely necessary to stabilize biomanipulation measures, but this is much more difficult than the control of direct effects and needs deeper insights into the structuring mechanisms of food webs. Proper management of fish stocks, in combination with the control of phosphorus load and/or the physical conditions, seems to be the most promising way of controlling the indirect effects of biomanipulation.

Item Type: Book Section
Title: The control of indirect effects of biomanipulation
Personal Creator/Author:
Benndorf, J.
Title of Book: Eutrophication: research and application to water supply
Sutcliffe, David W.
Jones, J. Gwynfryn
Refereed: No
Series Name: FBA Special Publications
Volume: 3
Page Range: pp. 82-93
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; Biomanipulation; Water quality control; Food webs; Phosphorus
Subjects: Ecology
Item ID: 5289
Depositing User: Hardy B Schwamm
Date Deposited: 09 May 2011 20:02
Last Modified: 29 Sep 2011 15:08
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