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Complexity of the Culex pipiens complex in California
L Kothera1, B Nelms2, H M Savage1
1Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO.
Proceedings and Papers of the ... Annual Conference of the Mosquito and Vector Control Association of California. Mosquito and Vector Control Association of California. Conference
|July 14, 2017
Summary
Genetic analysis reveals widespread hybridization between Culex pipiens and Culex quinquefasciatus mosquitoes across California's Central Valley. Findings show distinct regional genetic patterns and hybrid prevalence, informing West Nile Virus vector research.
Area of Science:
- Entomology
- Genetics
- Vector-borne disease research
Background:
- The Culex pipiens complex, including Culex pipiens and Culex quinquefasciatus, is a significant group of mosquitoes in California.
- Understanding the genetic makeup and distribution of these mosquito populations is crucial for managing vector-borne diseases like West Nile Virus.
Purpose of the Study:
- To investigate the genetic structure and introgression patterns within the Culex pipiens complex in California.
- To identify the prevalence of different genotypes and hybrids across various regions.
- To lay the groundwork for correlating genetic profiles with key phenotypes relevant to disease transmission.
Main Methods:
- Utilized 15 microsatellite markers for genetic analysis.
- Employed statistical analyses to assess within- and among-population genetic variation.
- Sampled mosquito populations from key areas including the Central Valley, Coachella Valley, Los Angeles, and Benton, WA.
Main Results:
- Documented widespread introgression of Culex pipiens complex genotypes throughout California's Central Valley.
- Observed a north-south genetic gradient, with Culex quinquefasciatus genotypes dominant in the south and Culex pipiens in the north.
- Identified significant hybridization in Sacramento County (pipiens-quinquefasciatus and pipiens-molestus) and distinct populations in Coachella Valley (quinquefasciatus) and Benton, WA (pipiens).
Conclusions:
- The genetic landscape of the Culex pipiens complex in California is characterized by extensive hybridization and regional differentiation.
- These genetic findings provide a foundation for future studies linking specific genotypes to autogeny, diapause, and West Nile Virus vector competence.
- Ongoing research aims to connect these genetic patterns with traits influencing disease transmission potential.
