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INFLUENCE OF WATER CURRENT ON CASE WEIGHT IN LARVAE OF THE CADDISFLY, GOERA CALCARATA BANKS

Published online by Cambridge University Press:  31 May 2012

Dwight A. Webster  and
Priscilla C. Webster
Dwight A. Webster
Affiliation:
Laboratory of Limnology and Fisheries, Cornell University, Ithaca, New York
Priscilla C. Webster
Affiliation:
Laboratory of Limnology and Fisheries, Cornell University, Ithaca, New York
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Extract

The larvae of certain Trichoptera are known to fashion into their cases structures to which a “ballast” function has been ascribed (Stuck, 1900; Buchner, 1905; Rousseau, 1921; Lloyd. 1921; Needham and Lloyd, 1937). Of forms living in the Ithaca, New York, region the cases of Stenophylax scabripennis, Halesus guttifer, Neophylax, and Goera calcarata are offered as examples. The term “ballast” has been used to imply a balancing as well as a weighting purpose depending upon the particular species under discussion. Rousseau (1921) in describing the general types of caddis cases says “…. in the absence of current, they (the cases) do not in general offer such adaptations as those which we find in the larvae living in moving water.

Type
Articles
Information
The Canadian Entomologist , Volume 75 , Issue 6 , June 1943 , pp. 105 - 108
Copyright
Copyright © Entomological Society of Canada 1943

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References

LITERATURE CITED

Buchner, Paul. 1905. Über “Belaslungsteile,, und Anpassung Bei Larvengshaiisen of Trichoptera. Zeitschr. Wiss. Insektenbrol 1:374–78.Google Scholar
Lloyd, J. T. 1921. The Biology of North American Caddis Fly Larvae. Bull. Lloyd Library of Botany, Pharmacy and Materia Medica, Ent. Ser. No. 1. 124 pp.Google Scholar
Needham, J. G. and Lloyd, J. T.. 1937. Life of Inland Waters. Comstock Publishing Co., 3rd edit. p. 372.Google Scholar
Rousseau, E. 1921. Les Larves et Nymphs Aquatiques des Insecta d'Europe. Bruxelles. p. 375.Google Scholar
Snedecor, G. W. 1940. Statistical Methods. Iowa State College Press, 3rd edit. 422 pp.Google Scholar
Struck, Rudolf. 1900. Lübeckische Trichoptera und Gehaüse ihrer Larven und Puppen. In Das Museum zu Lübeck. 34 pp.Google Scholar