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Climate and Urbanization Drive Mosquito Preference for Humans
Noah H Rose1, Massamba Sylla2, Athanase Badolo3
1Department of Ecology & Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA; Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA.
Current Biology : CB
|July 25, 2020
Summary
Mosquitoes that bite humans spread most diseases. This study reveals ecological factors and genetics driving this shift in Aedes aegypti mosquitoes, predicting increased human-biting with urbanization.
Area of Science:
- Vector-borne disease ecology
- Arthropod behavior
- Evolutionary genetics
Background:
- Mosquito-borne illnesses are primarily transmitted by a few human-specialist mosquito species.
- The evolutionary drivers behind this host-seeking behavior remain largely unknown.
- Aedes aegypti is a significant vector of arboviruses, including dengue and Zika.
Purpose of the Study:
- To investigate the ecological and genetic factors influencing host preference in Aedes aegypti.
- To understand the evolutionary origins of human-biting behavior in this key disease vector.
- To predict future shifts in mosquito behavior due to environmental changes.
Main Methods:
- Field collection and behavioral assays of Aedes aegypti from 27 sites in sub-Saharan Africa.
- Ecological modeling to correlate mosquito host preference with environmental variables (dry season intensity, human population density).
- Whole-genome sequencing of 375 mosquitoes to identify genetic associations with human preference.
Main Results:
- Significant variation in human versus animal odor preference was observed across mosquito populations.
- Dry season intensity and human population density explained over 80% of this behavioral variation.
- A single ancestry component, linked to human preference, was identified with genetic changes concentrated in specific chromosomal regions.
Conclusions:
- Human-biting in Aedes aegypti likely evolved as a byproduct of breeding in human-associated water sources during dry seasons.
- Urbanization is predicted to drive further evolution towards human-biting in Aedes aegypti populations.
- Understanding these evolutionary dynamics is crucial for predicting and controlling mosquito-borne disease transmission.
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