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A Study of Factors determining the Distribution of the Larvae of the Blackfly, Simulium ornatum Mg

Published online by Cambridge University Press:  10 July 2009

J. Phillipson
J. Phillipson
Affiliation:
Department of Zoology, Durham Colleges, University of Durham.
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Extract

Field and laboratory studies on the rôle of oxygen concentration and speed of current on larvae of Simulium ornatum Mg. show that current speed is more important than oxygen concentration in governing their distribution.

The larvae prefer waters with a velocity range of 50 to 120 cm./sec., the greatest numbers occurring between 80 and 90 cm./sec.

Larvae move independently of oxygen in concentrations above 50 per cent, saturation level.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 47 , Issue 2 , July 1956 , pp. 227 - 238
Copyright
Copyright © Cambridge University Press 1957

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