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Landing responses of the tsetse fly Glossina morsitans morsitans Westwood and the stable fly Stomoxys calcitrans (L.) (Diptera: Glossinidae & Muscidae) to black-and-white patterns: a laboratory study

Published online by Cambridge University Press:  10 July 2009

John Brady  and
William Shereni
John Brady*
Affiliation:
Department of Pure and Applied Biology, Imperial College of Science and Technology, London, UK
William Shereni
Affiliation:
Department of Pure and Applied Biology, Imperial College of Science and Technology, London, UK
*
* J. Brady, Imperial College, Silwood Park, Ascot, Berks., SL5 7PY, UK.
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Abstract

The landing preferences of fed males of Glossina morsitans morsitans Westwood and Stomoxys calcitrans (L.) were measured under constant conditions in a two-choice situation. Pairs of black-and-white landing targets were presented on the grey walls of an arena ca 60 cm in diameter. In a simple choice of blackness vs whiteness, G. m. morsitans showed a ninefold greater preference for black; S. calcitrans displayed no preference. G. m. morsitans landed twice as frequently on a 15×30-cm vertical black stripe as on a horizontal one, but S. calcitrans preferred the horizontal one. Comparisons between a vertical stripe (or a horizontal one) and similar stripes sloping at various angles indicated that at about 50° G. m. morsitans distinguished the sloping stripe from the vertical (or the horizontal), but did not well distinguish slopes closer to the vertical (or horizontal). Tests with multiple vertical stripe patterns indicated that G. m. morsitans did not significantly distinguish between a single 15-cm stripe and two- or three-striped targets of the same total black area, but landed significantly less frequently on targets of four or five stripes, implying an angular, behavioural visual ‘resolution' of roughly 17°; S. calcitrans responded similarly. Both species showed a marked preference for landing near the edge of the black on all targets, with G. m. morsitans strongly biassed to the black side of an interface.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 78 , Issue 2 , June 1988 , pp. 301 - 311
Copyright
Copyright © Cambridge University Press 1988

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