Advertisement

International Journal of Tropical Insect Science

, Volume 11, Issue 6, pp 861–863 | Cite as

Chromosomal Inversion Polymorphism in Anopheles Gambiae and Anopheles Arabiensis in Tanzania

  • A. E. P. Mnzava
  • M. A. Di Deco
Research Article

Abstract

Chromosomal inversion polymorphism was investigated in samples of Anopheles gambiae sensu lato collected from different localities of Tanzania. An. merits was found monomorphic, while two widespread inversion polymorphisms were recorded in both An. gambiae sensu stricto (2Rb/+ and 2La/+) and An. arabiensis (2Rb/+ and 3Ra/+). Two additional polymorphic inversions (2 Rbr and 2Rq), generally associated, were observed in An. arabiensis from the Rift Valley. Observed karyotype frequencies were in agreement with those expected according to the Hardy-Weinberg equilibrium suggesting conditions of panmixia in both An. gambiae s.s. and An. arabiensis in the studied areas.

Key Words

Chromosomal inversion polymorphism Anopheles gambiae Anopheles arabiensis Anopheles merus frequency 

Résumé

Le polymorphisme de l’inversion chromosomique a été étudié sur des échantillons d’Anopheles gambiae sensu lato, collectés en divers endroits de Tanzanie. An. merus est apparu monomorphe, alors que 2 inversions polymorphes étendues étaient mises en évidence chez An. gambiae sensu stricto (2Rb/+ et 2La/+) et chez An. arabiensis (2Rb/+ et 3Ra/+). De plus, deux inversions polymorphes (2Rbr et 2Rq), généralement associées, on été observées chez An. arabiensis dans la Vallée du Rift. Les fréquences observées des caryotypes étaient en accord avec ce qui étaient espéré, selon l’équilibre de Hardy-Weinberg, suggérant les conditions d’une “panmixie” entre An. gambiae s.s. et An. arabiensis dans la région étudiée.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Brown A. (1970) The estimation of Wright’s fixation index from genotypic frequencies. Genetica 41, 399–406.CrossRefGoogle Scholar
  2. Coluzzi M., Sabatini A., Petrarca V. and Di Deco M. (1979) Chromosomal differentiation and adaptation to human environments in the Anopheles gambiae complex. Trans. R. Soc. Trop. Med. Hyg. 73, 483–493.CrossRefGoogle Scholar
  3. Coluzzi M. (1984) Heterogeneities of the malaria vectorial system in tropical Africa and their significance in malaria epidemiology and control. Bull. WHO 62, 107–113.PubMedPubMedCentralGoogle Scholar
  4. Coluzzi M., Petrarca V. and Di Deco M. (1985) Chromosomal inversion intergradation and incipient speciation in Anopheles gambiae. Boll. Zool. 52, 45–63.CrossRefGoogle Scholar
  5. Hunt R. (1973) A cytological technique for the study of the Anopheles gambiae complex. Parassitologica 15, 137–139.Google Scholar
  6. Mekuria Y., Petrarca V., and Tesfamarian T. (1982) Cytogenetic studies on the malaria vector mosquito Anopheles arabiensis Patton in the Awash valley, Ethiopia. Parassitologia 24, 238–243.Google Scholar
  7. Mnzava A. and Kilarna W. (1986) Observations on the distribution of the Anopheles gambiae complex in Tanzania. Acta Trop. 43, 277–282.PubMedPubMedCentralGoogle Scholar
  8. Mosha F. and Petrarca V. (1983) Ecological studies on Anopheles gambiae complex species on the Kenya Coast. Trans. R. Soc. Trop. Med. Hyg. 77, 344–345.CrossRefGoogle Scholar
  9. Petrarca V., Carrara G., Di Deco M. and Petrangeli G. (1984) Cytogenetic and biometric observations on the members of the Anopheles gambiae complex in Mozambique. Parassitologia 26, 247–259.PubMedPubMedCentralGoogle Scholar

Copyright information

© ICIPE 1990

Authors and Affiliations

  • A. E. P. Mnzava
    • 1
  • M. A. Di Deco
    • 2
  1. 1.National Institute for Medical ResearchUbwari Research StationMuhezaTanzania
  2. 2.Instituto di ParassitologiaUniversita “La Sapienza” — RomaRomaItalia

Personalised recommendations