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Steven Frank

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In this study, we investigated how the interaction of urbanization, latitudinal warming, and scale insect abundance affected urban tree health. We predicted that trees in warmer, lower latitude cities would be in poorer health at lower levels of urbanization than trees at cooler, higher latitudes due to the interaction of urbanization, latitudinal temperature, and herbivory. To evaluate our predictions, we surveyed the abundance of scale insect herbivores on a single, common tree species (Acer rubrum) in eight US cities spanning 10° of latitude. We estimated urbanization at two extents, a local one that accounted for the direct effects on an individual tree, and a larger one that captured the surrounding urban landscape.
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Southeast Climate Adaptation Science Center Consortium - Hosted by North Carolina State University (2017-2023)
The Southeast Climate Adaptation Science Center (SE CASC) promotes collaborative research, with a focus on training next-generation scientists through active engagement with stakeholders and agencies, to enhance landscape-level conservation and management of natural and cultural resources. The SE CASC is hosted by North Carolina State University (NCSU) with consortium partners Duke University, Auburn University, University of Florida, University of Tennessee, and University of South Carolina. University host NCSU connects the SE CASC to top scientists and stakeholders across the region to address the complexities of land management and conservation during rapid climate change, population growth, and urbanization....
Plants growing in vegetationally diverse habitats or near taxonomically distinct neighbors often experience less herbivory than plants in more simple habitats. When plants experience more herbivory in these situations it is called associational susceptibility and is most common when herbivores spill from their preferred plant host onto neighboring plants. Cankerworms are common pests of urban trees that have been shown in forests to disperse from preferred to less preferred hosts. I found that two common characteristics of urban habitats, low vegetational diversity and exotic plants, affect cankerworm herbivory of non-host understory plants. In an urban landscape I measured cankerworm herbivory on native dogwood...
Abstract (from PeerJ): Urban trees serve a critical conservation function by supporting arthropod and vertebrate communities but are often subject to arthropod pest infestations. Native trees are thought to support richer arthropod communities than exotic trees but may also be more susceptible to herbivorous pests. Exotic trees may be less susceptible to herbivores but provide less conservation value as a consequence. We tested the hypotheses that native species in Acer and Quercus would have more herbivorous pests than exotic congeners and different communities of arthropod natural enemies. The density of scale insects, common urban tree pests, was greatest on a native Acer and a native Quercus than exotic congeners...
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Effects of Urbanization on the Conservation Value of Forests
Urbanization in the Southeast U.S. is among the fastest in the nation, and represents a primary threat to threatened and endangered species. As urbanized areas expand, they are encroaching on preserved areas, like national wildlife refuges, and are dividing forests into smaller fragments. Forests that are located next to cities and suburbs are exposed to high temperatures, pollution, insect pests, invasive plants, and other factors that threaten forest health. However, forests located within urban and suburban areas – “urban forests” are capable of supporting diverse plant and animal life, and could play an increasingly important role in conservation as urbanization continues. Little is currently known about how...
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