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Effects of microclimatic changes caused by land use and land cover on duration of gonotrophic cycles of Anopheles gambiae (Diptera: Culicidae) in western Kenya highlands
- Source :
- Journal of medical entomology. 42(6)
- Publication Year :
- 2006
-
Abstract
- Studies were carried out at a malaria epidemic-prone highland site in western Kenya to determine the effects of deforestation-caused microclimate change on the duration of the gonotrophic cycle of the malaria vector Anopheles gambiae Giles. Gonotrophic cycle duration was measured using field-collected F1 A. gambiae females. Average ambient temperature in the deforested area of Kakamega (elevation 1,430-1,580 m above sea level), western Kenya, was 0.5 degrees C higher than that of the forested area over a 10-mo period. During the dry season, deforested areas showed an increased mean indoor temperature of 1.8 degrees C, and a shortened duration of the mosquitoes' first and second gonotrophic cycles, by 1.7 d (59%) and 0.9 d (43%). During the rainy season, the average indoor temperature of houses located in the deforested area was 1.2 degrees C higher than in houses in the forested area. The duration of the first and second gonotrophic cycles was shortened by 1.5 d (17%) and 1.4 d (27%), respectively, in the deforested highland site. A shorter mosquito gonotrophic cycle implies increased daily biting frequency and thus increased vectorial capacity. Together with evidence that deforestation reduced A. gambiae larva-to-adult developmental time and increased larval and adult survivorship, this study suggests that deforestation can further enhance malaria transmission potential in the highlands through increased indoor temperature and shortened gonotrophic cycle durations of A. gambiae mosquitoes.
- Subjects :
- Wet season
Male
Veterinary medicine
Anopheles gambiae
Microclimate
Biology
Environment
medicine.disease_cause
Trees
Deforestation
parasitic diseases
Dry season
Anopheles
medicine
Animals
Larva
General Veterinary
Ecology
Reproduction
Environmental factor
Temperature
Humidity
medicine.disease
biology.organism_classification
Kenya
Infectious Diseases
Fertility
Insect Science
Parasitology
Female
Malaria
Subjects
Details
- ISSN :
- 00222585
- Volume :
- 42
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Journal of medical entomology
- Accession number :
- edsair.doi.dedup.....7f9b88ea7295dd6bcdf06e11ba5d37f4