Experimental set-up in Lemming (6 artificial mini-streams)
In Lemming we have established an experimental set-up consisting of six 12 m long drain pipes. The pipes are to simulate mini-streams. Natural sediment has been placed at the bottom and small animals have been added, and water from the nearby brook “Lemming Bæk” flows through the pipes.
In the pipes we investigate the impacts of pesticides on small animals. The animals are exposed to insecticides for 1.5 h – and we study the effects both during the exposure and up to 30 days afterwards. Our focus is directed at survival, turnover of organic matter (dead beech leaves). We then investigate how quickly the animals return and form new colonies in the pipes.
The investigations form part of the project The effect of pyrethroids on the biological structure in streams, comprising also experiments with animals in streams and in the laboratory.
Responsible: Peter Wiberg-Larsen pwl@dmu.dk
Last update: June 2008
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Foto (1): Placed packages containing leaves, a food item for some of the animals .
Foto (2): Pipe outlet
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The spinner Baetis in the experimental pipes. With its streamlined shape it is adapted to a life in running water. The larvae feed on algae on stones, whereas the grown-up individuales do not eat at all and only live for a few hours. (Photo: Niels Sloth) |
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