1.Developing time-based model for the prediction of breeding activities of dengue vectors using early life cycle variables and epidemiological information in Northern Malaysia
Tropical Biomedicine 2017;34(3):691-707
Autoregressive integrated moving average (ARIMA) was applied to make realtime
predictions on the Aedes egg populations in three selected dengue hotspots of
Penang, Malaysia. The weekly ovitrap collection was carried out to determine the
abundance of Aedes eggs in field population in some selected areas. The ARIMA models
were able to estimate actual egg abundance using two criteria. The first criteria is
determine the reliability of statistics and the second is to measure the accuracy of
forecasting ability of the model equation. The parsimonious model with a lowest order
of AR or MA and RMSE value of the forecast for each data set was considered the best.
ARIMA (1,0,0), ARIMA (2,0,0) and ARIMA (0,1,1) models were judged to be the best fit
for the suburban, urban squatter and urban area data sets respectively. The models were
able to forecast the number of eggs within a range of one to eleven weeks. The developed
models were able to estimate the egg abundance adequately to permit their use in Aedes
control programme in Penang Island. Thus, it can be a useful tool for health officials to
improve the management of mosquito control and alert the public to reduce the possibility
of dengue outbreaks.
2.Population analysis of Aedes albopictus (Skuse) (Diptera:Culicidae) under uncontrolled laboratory conditions.
H Nur Aida ; A Abu Hassan ; A T Nurita ; M R Che Salmah ; B Norasmah
Tropical biomedicine 2008;25(2):117-25
A semi laboratory experiment using 3 cohorts of Aedes albopictus adults was performed to obtain age-specific mortality and fecundity information and to derive statistical estimates of some population growth parameters. Life expectancy was calculated for both males and females. The following population parameters were estimated: intrinsic rate of increase (rm= 0.21), net reproductive (replacement) rate (Ro= 68.70), age at mean cohort reproduction (To=10.55 days), birth rate (B=0.23), death rate (D=0.02) and generation time (G=20.14 days). The high rm/B (0.91) and B/D (11.50) ratios indicated the high colonizing ability of Ae. albopictus in nature.
Upper case Bee
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Aedes albopictus
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Culicidae
3.The biology and demographic parameters of Aedes albopictus in northern peninsular Malaysia.
H Nur AIDA ; Hamady DIENG ; Abu Hassan AHMAD ; Tomomitsu SATHO ; A T NURITA ; M R Che SALMAH ; Fumio MIAKE ; B NORASMAH
Asian Pacific Journal of Tropical Biomedicine 2011;1(6):472-477
OBJECTIVETo generate life table characteristics for the dengue vector Aedes albopictus (A. albopictus) under uncontrolled conditions, incorporating both the aquatic and the adult stages.
METHODSTen females derived from wild pupae were allowed to fully blood-feed on restrained mice. 774 eggs were hatched in seasoned water. F1 larvae were followed for development until their F2 counterparts emerged as adults. Some population parameters were monitored (F1) or estimated (F2).
RESULTSA. albopictus exhibited increased fecundity and egg hatch success. Immature development was quick. Immature survival was high, with lowest rate in the pupal stage. Adult emergence was about 81% and sex ratio was close to 1:1. Generational mortality (K) was about 28%. A high proportion of females completed a reproductive cycle and the obtained parity rate was predicted to lead to higher fecundity in the next generation.
CONCLUSIONSIt can be concluded that natural A. albopictus populations in Penang seem largely determined by quick development in combination with low immature loss and increased oviposition.
Aedes ; growth & development ; physiology ; Animals ; Female ; Insect Vectors ; Malaysia ; Male ; Mice ; Vital Statistics