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A tiger in the Upper Midwest: Surveillance and genetic data support the introduction and establishment of Aedes albopictus in Iowa, USA

David R. Hall, Ryan E. Tokarz, Eleanor N. Field, View ORCID ProfileRyan C. Smith
doi: https://doi.org/10.1101/2021.10.20.465182
David R. Hall
1Department of Entomology, Iowa State University, Ames, Iowa, USA
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Ryan E. Tokarz
1Department of Entomology, Iowa State University, Ames, Iowa, USA
2Department of International and Global Studies, Mercer University, Macon, Georgia, USA
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Eleanor N. Field
1Department of Entomology, Iowa State University, Ames, Iowa, USA
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Ryan C. Smith
1Department of Entomology, Iowa State University, Ames, Iowa, USA
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  • For correspondence: smithr@iastate.edu
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Abstract

Aedes albopictus is a competent vector of several arboviruses that has spread throughout the United States over the last three decades after it was initially detected in Texas in 1985. With the emergence of Zika virus in the Americas in 2015-2016 and an increased need to better understand the current distributions of Ae. albopictus in the US, we initiated surveillance efforts to determine the abundance of invasive Aedes species in Iowa. Here, we describe the resulting surveillance efforts from 2016-2020 in which we detect stable and persistent populations of Aedes albopictus in three Iowa counties. Based on temporal patterns in abundance and genetic analysis of mitochondrial DNA haplotypes between years, our data support that populations of Ae. albopictus are overwintering and have likely become established in the state. In addition, the localization of Ae. albopictus predominantly in areas of urbanization and noticeable absence in rural areas suggests that these ecological factors may represent potential barriers to their further spread and contribute to overwintering success. Together, these data document the establishment of Ae. albopictus in Iowa and their expansion into the Upper Midwest, where freezing winter temperatures were previously believed to limit their spread. With increasing globalization, urbanization, and rising temperatures associated with global warming, the range of invasive arthropod vectors, such as Ae. albopictus, is expected to only further expand, creating increased risks for vector-borne disease.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-ND 4.0 International license.
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Posted October 21, 2021.
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A tiger in the Upper Midwest: Surveillance and genetic data support the introduction and establishment of Aedes albopictus in Iowa, USA
David R. Hall, Ryan E. Tokarz, Eleanor N. Field, Ryan C. Smith
bioRxiv 2021.10.20.465182; doi: https://doi.org/10.1101/2021.10.20.465182
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A tiger in the Upper Midwest: Surveillance and genetic data support the introduction and establishment of Aedes albopictus in Iowa, USA
David R. Hall, Ryan E. Tokarz, Eleanor N. Field, Ryan C. Smith
bioRxiv 2021.10.20.465182; doi: https://doi.org/10.1101/2021.10.20.465182

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