Avian host preference by vectors of eastern equine encephalomyelitis virus.

The research paper discusses the feeding behavior of mosquito vectors carrying the Eastern Equine Encephalomyelitis (EEE) virus towards different bird species, showing a preferential pattern rather than being random or proportional to bird species abundance.

Consumption Behavior of Mosquito Vectors

• The researchers gathered blood-fed mosquitoes in 2002 that were confirmed vectors of the EEE virus, during a period when the virus was actively transmitted, from a site in central Alabama known to regularly see cases of the virus.
• The blood meals of these mosquitoes that derived from birds were identified down to the species level of the host bird. The researchers then compared the proportion of blood meals taken from each bird species to the overall composition of bird species at the study site.

Findings and Observations

• Results illustrated that the mosquito vectors carrying the EEE virus fed more on certain bird species and less on others than would be expected given the overall bird species’ abundance, biomass, or overall size in the study area.
• This suggests that the feeding pattern isn’t strictly influenced by bird availability and abundance but rather indicates a focused targeting behavior by the mosquitoes towards certain bird species.

Implications of the Study

• The finding of this study is essential because it could influence strategies taken to prevent or lessen the spread of the EEE virus. By knowing which bird species are more likely to be bitten by the vector mosquitoes, the distribution and health of these species can be more actively monitored and managed.
• Moreover, since a mosquito tasting preference for specific avian species could hint on potential factors contributing to the preferential transmission of the EEE virus. This could aid in better modeling the spread of this virus, and even possibly other similar viruses, in bird populations.