Abstract
MEASUREMENT of tethered flight provides an index of flight behaviour in migratory insects1. Although tethered flight probably overestimates field performance2, the frequency distributions are similar for flight duration in Lygaeus kalmii caught in the field (Iowa City, Iowa populations) and reared in the laboratory (Fig. 1). Thus it is possible to obtain from populations reared in the laboratory data which index behaviour of ecological significance and to examine in detail individual differences in flight behaviour. These differences may reflect effects of both genetic and environmental variation.
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