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Why do Potamophylax Cingulatus (Steph.) (Trichoptera) Larvae Aggregate at Pupation?

  • C. Otto
  • B. S. Svensson
Part of the Series Entomologica book series (SENT, volume 20)

Summary

In stream-living Potamophylax cingulatus, current velocity was found to be an ultimate factor in guiding settlement of the larvae prior to pupation, areas of high current velocity being avoided. In areas suitable for pupation, i.e. in a low current regime, the larvae formed aggregations only under certain stones. Most pupae were found in large (> 40 inds.) aggregations, where also hatching success was highest. Infestation by a chironomid larva, Polypedilum fallax Joh., peaked at intermediate aggregation size. We suggest pupal aggregations to be formed in order to reduce the risk of becoming a victim of the chironomid.

Keywords

Current Velocity Large Aggregation Hatching Success Infestation Rate Downstream Part 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Dr W. Junk Publishers, The Hague 1981

Authors and Affiliations

  • C. Otto
  • B. S. Svensson

There are no affiliations available

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