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Temporal and spatial stability of Anopheles gambiae larval habitat distribution in Western Kenya highlands.

Li L, Bian L, Yakob L, Zhou G, Yan G - Int J Health Geogr (2009)

Bottom Line: In order to optimize the utility of these tools, detailed knowledge of the spatial distribution patterns of mosquito larval habitats is crucial.Using larval habitat data collected in western Kenya highlands during both dry and rainy seasons of 2003-2005, this study analyzed the seasonal and inter-annual changes in the spatial patterns in mosquito larval habitat distributions.We found that the spatial patterns of larval habitats had significant temporal variability both seasonally and inter-annually.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Political Science and Geography, Old Dominion University, Norfolk, Virginia, USA. lili36@ub-alumni.org

ABSTRACT

Background: Localized mosquito larval habitat management and the use of larvicides have been proposed as important control tools in integrated malaria vector management programs. In order to optimize the utility of these tools, detailed knowledge of the spatial distribution patterns of mosquito larval habitats is crucial. However, the spatial and temporal changes of habitat distribution patterns under different climatic conditions are rarely quantified and their implications to larval control are unknown.

Results: Using larval habitat data collected in western Kenya highlands during both dry and rainy seasons of 2003-2005, this study analyzed the seasonal and inter-annual changes in the spatial patterns in mosquito larval habitat distributions. We found that the spatial patterns of larval habitats had significant temporal variability both seasonally and inter-annually.

Conclusions: The pattern of larval habitats is extremely important to the epidemiology of malaria because it results in spatial heterogeneity in the adult mosquito population and, subsequently, the spatial distribution of clinical malaria cases. Results from this study suggest that larval habitat management activities need to consider the dynamic nature of malaria vector habitats.

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Percentages of stagnant aquatic habitats (A) and anopheline-positive habitats (B) that were observed repeatedly in same locations across seasons and years.
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Figure 3: Percentages of stagnant aquatic habitats (A) and anopheline-positive habitats (B) that were observed repeatedly in same locations across seasons and years.

Mentions: The percentages of overlapping aquatic habitats and anopheline-positive habitats between the February and the May within a year, or between the February/May of two different years, are shown in Figure 3. Results show that the percentage of overlapping anopheline-positive habitats were generally below 15%, with a maximum overlap of 24% in 2004 between the February and the May of unusually low precipitation (Figures 2, 3A and 3B).


Temporal and spatial stability of Anopheles gambiae larval habitat distribution in Western Kenya highlands.

Li L, Bian L, Yakob L, Zhou G, Yan G - Int J Health Geogr (2009)

Percentages of stagnant aquatic habitats (A) and anopheline-positive habitats (B) that were observed repeatedly in same locations across seasons and years.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2803444&req=5

Figure 3: Percentages of stagnant aquatic habitats (A) and anopheline-positive habitats (B) that were observed repeatedly in same locations across seasons and years.
Mentions: The percentages of overlapping aquatic habitats and anopheline-positive habitats between the February and the May within a year, or between the February/May of two different years, are shown in Figure 3. Results show that the percentage of overlapping anopheline-positive habitats were generally below 15%, with a maximum overlap of 24% in 2004 between the February and the May of unusually low precipitation (Figures 2, 3A and 3B).

Bottom Line: In order to optimize the utility of these tools, detailed knowledge of the spatial distribution patterns of mosquito larval habitats is crucial.Using larval habitat data collected in western Kenya highlands during both dry and rainy seasons of 2003-2005, this study analyzed the seasonal and inter-annual changes in the spatial patterns in mosquito larval habitat distributions.We found that the spatial patterns of larval habitats had significant temporal variability both seasonally and inter-annually.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Political Science and Geography, Old Dominion University, Norfolk, Virginia, USA. lili36@ub-alumni.org

ABSTRACT

Background: Localized mosquito larval habitat management and the use of larvicides have been proposed as important control tools in integrated malaria vector management programs. In order to optimize the utility of these tools, detailed knowledge of the spatial distribution patterns of mosquito larval habitats is crucial. However, the spatial and temporal changes of habitat distribution patterns under different climatic conditions are rarely quantified and their implications to larval control are unknown.

Results: Using larval habitat data collected in western Kenya highlands during both dry and rainy seasons of 2003-2005, this study analyzed the seasonal and inter-annual changes in the spatial patterns in mosquito larval habitat distributions. We found that the spatial patterns of larval habitats had significant temporal variability both seasonally and inter-annually.

Conclusions: The pattern of larval habitats is extremely important to the epidemiology of malaria because it results in spatial heterogeneity in the adult mosquito population and, subsequently, the spatial distribution of clinical malaria cases. Results from this study suggest that larval habitat management activities need to consider the dynamic nature of malaria vector habitats.

Show MeSH
Related in: MedlinePlus