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Determining the ages of adult females of different members of the Simulium damnosum complex (Diptera: Simuliidae) by the pteridine accumulation method

Published online by Cambridge University Press:  10 July 2009

A.L. Millest ,
R.A. Cheke ,
M.A. Howe ,
M.J. Lehane  and
R. Garms
A.L. Millest
Affiliation:
Natural Resources Institute, Chatham Maritime, Kent, UK
R.A. Cheke*
Affiliation:
Natural Resources Institute, Chatham Maritime, Kent, UK
M.A. Howe
Affiliation:
School of Biological Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, UK
M.J. Lehane
Affiliation:
School of Biological Sciences, University of Wales, Bangor, Gwynedd LL57 2UW, UK
R. Garms
Affiliation:
Bernhard-Nocht Institute for Tropical Medicine, D-2000 Hamburg 36, Bernhard-Nocht-Strasse 74, DE
*
Dr R. A. Cheke, Natural Resources Institute, Central Avenue, Chatham Maritime, Chatham, Kent ME4 4TB, UK.
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Abstract

A significant relationship between pteridine content of the head, fly age and fly size, which was independent of temperature, was found for adult females of Simulium sirbanum Vajime & Dunbar using flies maintained at different constant temperatures after eclosion. Similar relationships for flies maintained at varying temperatures within the species' natural ranges were obtained in experiments with the Beffa form of S. soubrense Vajime & Dunbar (sensu Post, 1986), S. sanctipauli Vajime & Dunbar (= S. soubrense sensu Post, 1986), S. squamosum (Enderlein), S. yahense Vajime & Dunbar and S. damnosum sensu stricto. Common slopes for the effects of age and size could be fitted to all these species. Relations between pteridine concentration in the head, fly size and age, with the common slopes but with species-specific intercepts, were used to estimate the age structure of wild-caught populations of the Beffa form of S. soubrense, S. squamosum and S. yahense. A dry season sample of S. squamosum was estimated to be older than a wet season sample. The mean age of the S. soubrense population, sampled one week after its presumptive breeding sites were treated with larvicides, was estimated to be 13.5 days. The maximum was 30.9 days and a frequency distribution of the estimates had distinct peaks, at three day intervals between 8 and 21 days. The significance of the results is discussed in relation to fly longevity and gonotrophic cycle lengths.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 82 , Issue 2 , June 1992 , pp. 219 - 226
Copyright
Copyright © Cambridge University Press 1992

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