Abstract:
:Invertebrate communities of lentic habitats comprise, amongst others, the crustacean Asellus aquaticus (Isopoda) and the turbellarian Dendrocoelum lacteum (Tricladida). Because D. lacteum preferentially preys on A. aquaticus, contaminants introduced into the aquatic environment may affect this predator-prey interaction, finally influencing the performance of the predator. However, no studies investigating implications of organic pollutants on this food web subsystem currently exist. Hence, the present study assessed short-term implications of pesticides with different modes of action, namely, the triazole fungicide tebuconazole and the pyrethroid insecticide lambda-cyhalothrin, during a 72 h trial. The experiments for tebuconazole showed a statistically significant decrease in predatory success of D. lacteum. Lambda-cyhalothrin, in contrast, increased predation success by 40%, which is, however, not statistically significant. Both the decrease and the increase in predation seemed to be primarily driven by an altered activity of the prey A. aquaticus. This may be hypothesized because any shift in the prey's activity influenced its probability to stick to mucus, a viscous substance released by D. lacteum, or to encounter the predator directly.
journal_name
Arch Environ Contam Toxicoljournal_title
Archives of environmental contamination and toxicologyauthors
Bundschuh M,Appeltauer A,Dabrunz A,Schulz Rdoi
10.1007/s00244-011-9743-2subject
Has Abstractpub_date
2012-07-01 00:00:00pages
77-85issue
1eissn
0090-4341issn
1432-0703journal_volume
63pub_type
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