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Satellite Imaging and Long-Term Mosquito Surveillance Implicate the Influence of Rapid Urbanization on Culex Vector Populations

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Satellite Imaging and Long-Term Mosquito Surveillance Implicate the Influence of Rapid Urbanization on Culex Vector Populations insects Article Satellite Imaging and Long-Term Mosquito Surveillance Implicate the Influence of Rapid Urbanization on Culex Vector Populations Eleanor N. Field, Ryan E. Tokarz and Ryan C. Smith * Department of Entomology, Iowa State University, Ames, IA 50011, USA * Correspondence: [email protected]; Tel.: +1-515-294-8828 Received: 19 July 2019; Accepted: 20 August 2019; Published: 24 August 2019 Abstract: The ecology and environmental conditions of a habitat have profound influences on mosquito population abundance. As a result, mosquito species vary in their associations with particular habitat types, yet long-term studies showing how mosquito populations shift in a changing ecological landscape are lacking. To better understand how land use changes influence mosquito populations, we examined mosquito surveillance data over a thirty-four-year period for two contrasting sites in central Iowa. One site displayed increasing levels of urbanization over time and a dramatic decline in Culex pipiens group (an informal grouping of Culex restuans, Culex pipiens, and Culex salinarius, referred to as CPG), the primary vectors of West Nile virus in central Iowa. Similar effects were also shown for other mosquito vector populations, yet the abundance of Aedes vexans remained constant during the study period. This is in contrast to a second site, which reflected an established urban landscape. At this location, there were no significant changes in land use and CPG populations remained constant. Climate data (temperature, total precipitation) were compiled for each location to see if these changes could account for altered population dynamics, but neither significantly influence CPG abundance at the respective site locations. Taken together, our data suggest that increased landscape development can have negative impacts on Culex vector populations, and we argue that long-term surveillance paired with satellite imagery analysis are useful methods for measuring the impacts of rapid human development on mosquito vector communities. As a result, we believe that land use changes can have important implications for mosquito management practices, population modeling, and disease transmission dynamics. Keywords: mosquito surveillance; mosquito ecology; urbanization; land use; Culex 1. Introduction Mosquitoes (Diptera: Culicidae) are highly diverse, with 3565 species documented in temperate and tropical climates around the world [1]. Although occupying a wide range of environments, all mosquitoes require suitable aquatic habitats for their immature stages. Depending on the mosquito species, larval habitats vary from natural to artificial that include: standing water, water-accumulating plants (i.e., bromeliads), artificial receptacles, brackish marshes, tree holes, and even hoof prints [2]. In each of these microhabitats, detritus and decaying matter serve as nutritional resources for developing larvae [3], while adults seek out nectar or take a blood meal to provide resources for egg production [4]. Insects 2019, 10, 269; doi:10.3390/insects10090269 www.mdpi.com/journal/insects Insects 2019, 10, 269 2 of 12 The success of a mosquito species in a given location is invariably tied to its ability to find acceptable larval habitats, energy sources, resting habitat, and acceptable hosts for blood–feeding. Urban, semi-urban, and rural environments provide different challenges and environmental features for organisms to navigate. Some insect species readily adapt to close human proximity, while others prefer rural locations [5]. Highly urban environments are often associated with decreased species abundance and species richness [6]. With 68% of the human population expected to live in urban areas by 2050 [7], increased urbanization has the potential to significantly influence mosquito distributions and mosquito-borne disease transmission. Urbanization has been described as a primary driver of mosquito population change in North America [8]. This includes decreases in mosquito abundance and increased species richness, where land use may be a more important factor than climate change in altering mosquito communities [8]. These changes in mosquito population dynamics as a result of urbanization can also have important implications for vector-borne disease transmission, causing an increase in some vector species such as Aedes albopictus and Anopheles gambiae [9,10]. In Iowa, 55 species of mosquitoes have been described [11], with the nuisance species Aedes vexans being the most abundant [12]. Culex pipiens group (CPG; a collective term encompassing the informal grouping of morphologically similar Culex pipiens, Culex restuans, and Culex salinarius suggested by Sucaet et al. [12]) are the second most abundant species in the state [12] and are the primary vectors of West Nile virus (WNV) transmission in central Iowa [13,14]. However, our understanding of how changes in land use influence these mosquito species is limited. To examine how mosquito populations vary over time, we examined mosquito species dynamics at two locations in central Iowa over a 34-year study period. One site experienced increasing urbanization, while the other remained relatively unchanged. Mosquito populations changed significantly at the site with increased urbanization: where a massive decline in Culex pipiens group mosquitoes coincided with a period of sustained commercial and residential development. In contrast, no significant changes in land use or mosquito population structure were detected at the stable urban site during the extended study period. Together, these data suggest that habitat loss resulting from urbanization significantly alters CPG mosquito populations, which could have important implications for disease transmission. 2. Materials and Methods 2.1. Mosquito Trapping Locations and Sample Collections For two locations in central Iowa (Figure1), historical data from single New Jersey light traps (NJLTs) were used to measure mosquito population counts at each site. The first trap was run from 1975–2008 in Ames, Iowa (42◦00008” N 93◦36002” W) representing an urbanizing environment, while the second trap was run from 1976–2009 in a public park in Des Moines, Iowa (41◦36042” N 93◦36035” W), an established urban landscape. With some yearly variance, traps were run continuously from mid-May to early October each year. Samples were pooled by week, and identified to species using morphological keys [15]. To normalize trapping efforts for collection time differences between years, the trap index (total mosquitoes collected/number of active trap nights) was used rather than raw mosquito counts. Insects 2019, 10, 269 3 of 12 Insects 2019, 10, x FOR PEER REVIEW 3 of 12 FigureFigure 1. OverviewOverview of of trapping locations in central Iowa. Historical Historical mosquito mosquito abundance abundance data data were examinedexamined from studystudy sites sites in in two two central central Iowa Iowa counties counties (Story (Story and and Polk) Polk) over over a 34-year a 34-year period. period. The Story The StoryCounty County site was site located was located in Ames in Ames (urbanizing), (urbanizing), near Iowa near State Iowa University State University (star), while (star), the while Polk the County Polk Countysite was site located was located in Des Moinesin Des Moines (established (established urban). urban). For county For county maps, maps, major highwaysmajor highways (white (white lines), lines),urban urban areas (medium areas (medium gray shading), gray shading), and rivers and/lakes rivers/lakes (dark grey) (dark are grey denoted) are denoted to display to countydisplay features. county features. 2.2. Remote Sensing of Trap Locations 2.3. LandLandsat use/Land 5 TM Cover CM1 (LULC) Level-1 imagery was obtained at five-year intervals from 1984–2004 using the public domain United States Geological Survey’s (USGS) EarthExplorer (https://earthexplorer.usgs.gov/). To examine land use changes in the study areas, land use/land cover models were generated For each of the years utilized, high-quality images (less than 10% scene cloud cover and less than using the Spatial Analyst extension in ArcGIS 10.4.1 software. A supervised classification of each 10% land cloud cover) were selected from July and August to reflect the period with the highest Landsat raster image was conducted using the Maximum Likelihood Classification method. Five historical mosquito abundance. All images were imported and edited using the clip tool in ArcGIS different land use classes (wetland/water, tree cover, barren, agricultural, and built) were defined 10.4.1 software to convert from the full image file to an output extent of the study area. This area from each image where applicable. Wetland/water refers to rivers and immediate floodplain areas, encompassed the study site as well as a buffer, reflecting a 4 km radius surrounding the NJLT centroid. where tree cover was attributed to heavily forested areas. Barren land refers to unused, non- Ae. vexans vegetativeThis distance land was (i.e., selected dirt). basedLastly, on the a markagricultural release class program identified that found agricultural 82% of recapturedareas in all stages of Ae. vexans cropspecimens development, occurred while within the 4 kmbuilt [16 class]. The refers flight to distance all zones for of developmentwas such selected as roads, to set thecommercial, radius, as Culex industrial,they have aand larger residential flight range areas. than Land usagespecies was [17 ],determined and were a using pre-dominant the Create species Signatures at both
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