Seasonality, biting cycle and parity of the yellow fever vector mosquito Haemagogus janthinomys in Trinidad
| Autor: | Dave D. Chadee, R. Ganesh, Elisha S. Tikasingh |
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| Rok vydání: | 1992 |
| Předmět: |
Wet season
Veterinary medicine Time Factors Transovarial transmission Range (biology) Rain Biology Dry season Yellow Fever medicine Animals Humans Diel vertical migration Ecology Evolution Behavior and Systematics General Veterinary Ecology Yellow fever Insect Bites and Stings Seasonality medicine.disease Circadian Rhythm Insect Vectors Parity Culicidae Trinidad and Tobago Insect Science Vector (epidemiology) Parasitology Female Seasons |
| Zdroj: | Medical and veterinary entomology. 6(2) |
| ISSN: | 0269-283X |
| Popis: | 1 Age composition, seasonal abundance and diel patterns of landing activity of the sylvan vector of yellow fever Haemagogus janthinomys Dyar were monitored weekly during 1981-82 by human collectors on the ground at Point Gourde in Chaguaramas Forest, 16km west of Port of Spain, Trinidad. 2 Landing collections of Hg.janthinomys showed only diurnal activity, from 06.00 to 18.00 (sunrise to sunset, universal time), with a single peak of activity between 10.00 and 16.00 hours. 3 Densities of Hg.janthinomys were about 6 times greater during the wet season (May-November) than during the dry season (December-April); the annual Williams' mean landing rate on two collectors was 9.3 per day. 4 Monthly parous rates averaged 59% (range 0–86%) and some females were up to seven-pars. Retained eggs (range 1–21, mean 7.7/female) were found in the ovaries of 1.3% of landing females, all of which had stage I ovarian follicles for the next gonotrophic cycle. Hence blood-feeding is not inhibited by egg retention, which might promote transovarial transmission of virus. Implications of these findings are discussed in relation to yellow fever epidemiology. |
| Databáze: | OpenAIRE |
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