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Insect Migration, Flight Periodicity and the Boundary Layer

L. R. Taylor
Journal of Animal Ecology
Vol. 43, No. 1 (Feb., 1974), pp. 225-238
DOI: 10.2307/3169
Stable URL: http://www.jstor.org/stable/3169
Page Count: 15
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Insect Migration, Flight Periodicity and the Boundary Layer
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Abstract

(1) Fifteen-point profiles of aerial density in relation to height up to 32 m were measured for twenty-four insect taxa. (2) All profiles showed a discontinuity. (3) This discontinuity occurred at a height of 30 cm for total insects, where mean-wind speed matched mean flight-speed. (4) Flight behaviour above the discontinuity was much more consistent than below. (5) Above the discontinuity, log density X log height regression coefficients conformed with expectation based on known behaviour, size, and upward atmospheric transport. (6) The discontinuity thus agrees with expectation from the boundary layer hypothesis. (7) The proportion of small insects above the boundary layer is significantly correlated with the diurnal flight periodicity of the taxon.

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