Activity traps and the corer : complementary methods for sampling aquatic invertebrates

  • Hyvönen T
  • Nummi P
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Abstract

We compared the picture of aquatic invertebrate fauna given by three types of samplingmethods: the corer as well as bottomand mid-water activity traps. The corer mainly caught benthic animals (89%), themost numerous groups of which were chironomids and sphaerids. Nektonwas more abundant in activity traps (77% in bottomand 63% in mid-water), themost numerous groupswere Cladocera and watermites. The size distributions in catch of the corer and the activity traps differed but there was no difference between the two types of activity traps. In activity traps, individuals of the smallest size class were most abundant, wheras animals of the second smallest size class were most numerous in the corer.We suggest that activity traps and the corer could be used as complementary methods to sample aquatic invertebrate communities.

Author-supplied keywords

  • activity trap
  • aquatic invertebrates
  • corer
  • sampling methods

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Authors

  • Terho Hyvönen

  • Petri Nummi

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