Effects of nutrient loading and insecticide application on the ecology of Elodea-dominated freshwater microcosms. II. Responses of macrophytes, periphyton and macroinvertebrate grazers.

T.C.M. Brock, R.M.M. Roijackers, R. Rollon, F. Bransen, L. van der Heyden

Research output: Contribution to journalArticleAcademicpeer-review

34 Citations (Scopus)

Abstract

In freshwater model ecosystems nutrient additions resulted in significant short-term increases in periphyton biomass. Effects of applications of both nutrients and the insecticide chlorpyrifos caused a larger and more prolonged increase in periphytic algae. After three to four weeks this bloom of periphytic algae was controlled by non-arthropod grazers, which increased in numbers after insecticide application. The study indicates that the top-down control of periphyton by grazers is an important regulatory mechanism in macrophyte-dominated aquatic ecosystems. Insecticides, by poisoning arthropod grazers, may indirectly stimulate periphytic algae, as long as resources and non-arthropod grazers permit this.
Original languageEnglish
Pages (from-to)53-74
JournalArchiv für Hydrobiologie
Volume134
Publication statusPublished - 1995

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