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Insect migration across Bass Strait during spring: a radar study

Published online by Cambridge University Press:  10 July 2009

V. A. Drake ,
K. F. Helm ,
J. L. Readshaw  and
D. G. Reid
V. A. Drake
Affiliation:
Division of Entomology, CSIRO, P.O. Box 1700, Canberra City, A.C.T. 2601, Australia
K. F. Helm
Affiliation:
Division of Entomology, CSIRO, P.O. Box 1700, Canberra City, A.C.T. 2601, Australia
J. L. Readshaw
Affiliation:
Division of Entomology, CSIRO, P.O. Box 1700, Canberra City, A.C.T. 2601, Australia
D. G. Reid
Affiliation:
Division of Atmospheric Physics, CSIRO, P.O. Box 77, Mordialloc, Victoria 3195, Australia
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Abstract

An entomological radar was used to observe insect flight activity at a coastal locality in north-western Tasmania during the spring of 1973. Insects were regularly observed to take off at dusk, and local movements from nearby islands were detected on several occasions. Large-scale southward movements of insects across Bass Strait were also observed and were found to be associated with the warm anticyclonic airflows which occur ahead of a cold front. Light-trap catches indicated that the insects were noctuid moths, with Persectania ewingii (Westw.), Heliothis punctiger Wllgr. and Agrotis munda Wlk. dominant. The movements appear to have originated mainly in Victoria and south-eastern South Australia, but it is tentatively suggested that the ultimate source of the moths was in the region stretching westwards from north-western Victoria and south-western New South Wales towards the shores of the Spencer Gulf, South Australia.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 71 , Issue 3 , September 1981 , pp. 449 - 466
Copyright
Copyright © Cambridge University Press 1981

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