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Conference Paper

The semipermeability of the pupal cocoon of Rhyacophila (Trichoptera: Spicipalpia)

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Schmidt,  Hans-Heinrich
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Wagner,  Rüdiger
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Wichard, W., Schmidt, H.-H., & Wagner, R. (1993). The semipermeability of the pupal cocoon of Rhyacophila (Trichoptera: Spicipalpia). In C. Otto (Ed.), Proceedings of the 7th International Symposium on Trichoptera (pp. 25-27). Leiden, The Netherlands: Backhuys Publisher.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-C9A2-9
Abstract
An osmotic gradient existed between river water and cocoon fluid in Rhyacophila fasciata Hagen pupae. The osmotic concentration was 4-8 mOsmol/l in the cocoon fluid and 2 mOsmol/l in the river water. Because of the gradient of osmotic tension (s = π* -p), water was forced into the cocoon until the osmotic pressure (π*) equalled the turgor pressure (p) of the cocoon membrane (π* = p; s = O). This hyperosmosis in the cocoon fluid was effected by the semipermeability of the cocoon membrane, which always kept the cocoon at its maximum volume.