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The Distribution of Flying Insects Near a Low Hedgerow

T. Lewis
Journal of Applied Ecology
Vol. 6, No. 3 (Dec., 1969), pp. 443-452
DOI: 10.2307/2401510
Stable URL: http://www.jstor.org/stable/2401510
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Distribution of Flying Insects Near a Low Hedgerow
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Abstract

The patterns of distribution, of insects flying over pasture, to leeward of a mixed hedge were measured with suction traps. Insects in the hedgerow and neighbouring fields were sampled with a vacuum sampler to show the probable origin of some taxa within the aerial populations. The patterns for insects drifting over the hedge from distant sources resembled patterns near artificial windbreaks of similar permeability, with accumulations extending about ten times the height of the hedge to leeward, and with the greatest density at about 2-4 H to leeward. Patterns for insects originating in the hedge were quite different, with accumulations extending a shorter distance to leeward and with greatest densities immediately behind the hedge. Whatever their origin, fewer insects accumulated in slow winds than in fast, which suggests that accumulations near hedges occur largely because the patterns of air-flow created by the hedge concentrate insects from the passing aerial population, not because the hedge itself supplies the greater population.

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