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The Effect of Current Speed on the Distribution of the Larvae of the Blackflies, Simulium variegatum (Mg.) and Simulium monticola Fried. (Diptera)

The Effect of Current Speed on the Distribution of the Larvae of the Blackflies, Simulium variegatum (Mg.) and Simulium monticola Fried. (Diptera)

Bull. ent. Res, London, 48: pt. 4, 811-819

DOI: 10.1017/s0007485300002911

Having shown that the choice of lowland streams by Simulium ornatum Mg. could be explained on the basis of current flow, the author carried out investigations in northern England in 1955 and 1956 on the reactions of larvae of 8. variegatum (Mg.) and 8. monticola Fried., species typical of fast-flowing highland streams, to currents of different velocities. Except in waterfalls during heavy spates, the greatest velocity met with was 300 cm. per second.

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