Details

Autor(en) / Beteiligte

• Gophen, M.
• Talling, JF (eds)
• Biro, P

Titel

Summary of the workshop on perspectives of biomanipulation in inland waters

Ist Teil von

• Hydrobiologia, 1990-02, Vol.191 (1), p.315-318

Erscheinungsjahr

1990

Quelle

SpringerLINK Contemporary (Konsortium Baden-Württemberg)

Beschreibungen/Notizen

• The term 'biomanipulation' was originally defined as management of aquatic communities by controlling natural populations of organisms aimed at water quality improvement (Shapiro et al., 1975). In a broad sense, the term biomanipulation is similar to others presently used by several authors: top-down forces, trophic cascade or food-web manipulation. All these terms refer to manipulation of secondary or tertiary producers and its impact on the community structure of aquatic ecosystems. Recently, the complexity of the ecosystem response and the role of bottom-up forces (nutrients) and/or nutrient-mediated effects of planktivorous fish on plankton community structure was considered. Pioneer experiments on biomanipulation were carried out by Hrbacek and his team during the late 50's and early 60's (Hrbacek et al., 1961). They demonstrated a fish effect on water quality through zooplankton predation and consequent decline of its grazing capacity followed by algal enhancement. Shortly afterwards, Brooks & Dodson (1965) and Hall et al. (1970) documented the effect of zooplanktivorous fish predation on lower trophic levels. During the 70's studies on biomanipulation were focussed on the effect of high trophic level consumers on water quality. Significant progress of biomanipulation studies was achieved during the 80's. Scientists increased the number of components that were studied within research on food-web manipulation and incorporated them into models: responses of phytoplankton and zooplankton to reduction or increase of predation pressure by planktivorous fish, and the effect of piscivory. Nutrients and fish mediated nutrient effects, bacteria, micro-zooplankton and picoplankton were also considered. (DBO)