Drift periodicity and upstream dispersion of stream insects

Authors

  • Merlyn A. Brusven Department of Entomology University of Idaho Moscow, Idaho, USA

Abstract

Drift periodicity and upstream dispersion by larval and nymphal insects from two north Idaho streams were investigated. Drift was determined with drift nets sampling at 2-hour intervals over 24-hour periods. Upstream dispersion was evaluated using a marking-release-recapture technique. Mayflies demonstrated nocturnal drift as did the corixid <i>Sigara (Vermicorixa) grossolineata</i> Hungerford and dipteran <i>Simulium</i> sp.; chironomids showed con tinuous drift as opposed to behavioural drift for most of the other insects studied. Both nocturnal and diurnal drift occurred with species in the order Trichoptera. Stonefies showed little tendency to drift. Mid-summer upstream dispersion by mature nymphs and larvae of selected species was found to be insignificant as a means of recolonizing insect-decimated riffle habitats and offsetting downstream displacement by drift.

References

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Published

2019-08-28

Issue

Vol. 67 (1970): Journal of the Entomological Society of British Columbia

Section

Articles

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