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Differences in laboratory performance between strains of Glossina morsitans morsitans Westwood from Rhodesia and Tanzania and associated chromosome diversity

Published online by Cambridge University Press:  10 July 2009

A. M. Jordan ,
M. A. Trewern ,
D. I. Southern ,
P. E. Pell  and
E. D. G. Davies
A. M. Jordan
Affiliation:
Tsetse Research Laboratory, University of Bristol, School of Veterinary Science, Langford, Bristol, BS18 7DU, U.K.
M. A. Trewern
Affiliation:
Tsetse Research Laboratory, University of Bristol, School of Veterinary Science, Langford, Bristol, BS18 7DU, U.K.
D. I. Southern
Affiliation:
Department of Zoology, University of Manchester, Manchester, M13 9PL, U.K.
P. E. Pell
Affiliation:
Department of Zoology, University of Manchester, Manchester, M13 9PL, U.K.
E. D. G. Davies
Affiliation:
Department of Zoology, University of Manchester, Manchester, M13 9PL, U.K.
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Abstract

Abstract

A laboratory colony of Glossina morsitans morsitans Westw. which originated from puparia collected near Kariba, Rhodesia was more productive than another colony which originated from Handeni, northern Tanzania; during 1975, the former produced an average of 5–9 puparia per female and the latter 3–6. Although mortality in the Tanzanian colony was somewhat higher than in the Rhodesian colony, the main reason for the lower productivity of the Tanzanian colony was the much poorer fecundity of the females. This was associated with abnormalities of the reproductive system. The differences in laboratory performance between the two stocks were probably a reflection of their genetic diversity. Thus the Tanzanian Y chromosome is metacentric compared with the almost acrocentric Y chromosome of Rhodesian males, and some individuals carry small metacentric supernumerary chromosomes which are not present in Rhodesian flies. Giemsa C-banding showed band differences between the chromosome complements of the two stocks. Probably the most important difference, revealed by polytene chromosome analysis, is a large inversion in the X chromosome of Tanzanian flies, which, together with at least one band difference, is fixed in the homozygous condition. The possible evolutionary pathways of these mutations are outlined and their significance is discussed in terms of their distribution in nature and of the performance of the two strains in the laboratory.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 67 , Issue 1 , March 1977 , pp. 35 - 48
Copyright
Copyright © Cambridge University Press 1977

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