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Fate and effects of the insecticide Dursban 4E in indoor Elodea-dominated and macrophyte-free freshwater model ecosystems: II. Secondary effects on community structure.

Abstract：

:Secondary effects of a single dose of the insecticide Dursban 4E (active ingredient chlorpyrifos) were studied in indoor experimental freshwater ecosystems intended to mimic drainage ditches. Two experiments were performed, one in which all model ecosystems were dominated by the macrophyte Elodea muttallii, and one using systems devoid of macrophytes. In the Elodea-dominated and macrophyte-free model ecosystems, populations of primary producers, herbivores, carnivores and detritivores were indirectly affected via the loss of populations of Arthropoda as a direct result of insecticide application. However, the taxa in which secondary effects were observed differed considerably between these two types of model ecosystem. In macrophyte-dominated systems secondary effects were observed on populations of periphytic algae, the macrophyte Elodea nuttallii, the gastropod Bithynia tentaculata, Turbellaria, and sediment dwelling Oligochaeta. In open water systems it were populations of phytoplankton, the rotators Polyarthra and Asplanchna, bivalves (Sphaeriidae), Hirudinea, sediment dwelling Oligochaeta, and that of the isopod Proasellus coxalis in which secondary effects were observed. In aquatic ecosystems the presence or absence of a well-developed macrophyte vegetation may be a very important characteristic that determines the nature and route of secondary effects induced by pesticides. The differences in secondary effects observed between Elodea-dominated and macrophyte-free model ecosystems indicate that the system's structure and trophic dynamics should be taken into account when predicting ecological effects.

journal_name

Arch Environ Contam Toxicol

journal_title

Archives of environmental contamination and toxicology

authors

Brock TC,van den Bogaert M,Bos AR,van Breukelen SW,Reiche R,Terwoert J,Suykerbuyk RE,Roijackers RM

doi

10.1007/BF00203801

subject

Has Abstract

pub_date

1992-11-01 00:00:00

pages

391-409

issue

eissn

0090-4341

issn

1432-0703

journal_volume

pub_type

杂志文章

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Fate and effects of the insecticide Dursban 4E in indoor Elodea-dominated and macrophyte-free freshwater model ecosystems: II. Secondary effects on community structure.