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Migrating moths collected in tower-mounted light traps in northern New South Wales, Australia: influence of local and synoptic weather

Published online by Cambridge University Press:  10 July 2009

P.C. Gregg ,
G.P. Fitt ,
M. Coombs  and
G.S. Henderson
P.C. Gregg*
Affiliation:
Department of Agronomy and Soil Science, University of New England, Armidale, NSW, Australia
G.P. Fitt
Affiliation:
CSIRO Division of Entomology, Narrabri, NSW, Australia
M. Coombs
Affiliation:
Department of Zoology, University of New England, Armidale, NSW, Australia
G.S. Henderson
Affiliation:
Department of Agronomy and Soil Science, University of New England, Armidale, NSW, Australia
*
Dr. P. C. Gregg, Department of Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia.
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Abstract

Catches of moths in tower-mounted light traps in northern New South Wales were analysed in relation to local and synoptic weather. Catches were correlated with windspeed, relative humidity and possibly rainfall. No correlations were obtained with temperature or moon phase. Catches were more likely to occur when winds were from the east, and were associated with wind shifts. There was a significant association with the passage of depressions or troughs, but not cold fronts. The traps were considered to be poor indicators of migration associated with fronts, because these were accompanied by high winds in which trap efficiency was reduced. Stepwise multiple regressions using temperature, relative humidity, rainfall and windspeed accounted for only about 25% of the variance, much lower than in comparable studies with ground level light traps. These results are thought to indicate that the trap catches were reflecting long-distance migration, which was usually associated with disturbed weather. Back tracking with upper wind data was used to define probable sources of moths. In the spring and early summer, these sources were predominantly to the north and west of the traps, in semi-arid pastoral and subhumid cropping zones. In the late summer and autumn they were predominantly to the south and east, in the humid pastoral and forest zone. These results are discussed in relation to the migratory strategies of several important agricultural pest species.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 84 , Issue 1 , March 1994 , pp. 17 - 30
Copyright
Copyright © Cambridge University Press 1994

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