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Wednesday, April 11 • 10:45am - 11:00am
SYMPOSIA-11: Cleveland, Ohio Bee Communities are Shaped by Urban Landscape Composition and Land-use Legacy

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AUTHORS: Mary Gardiner, Frances Sivakoff, Katherine Todd, Scott Prajzner - The Ohio State University, Department of Entomology

ABSTRACT: Traditionally conservation has focused primarily on rural and natural landscapes, yet, with the Earth’s surface so significantly shaped by human activity it is critical to understand how to preserve and promote species in human-dominated ecosystems. Although we see a rise in urban living across the globe, due to protected economic downturn and the recent foreclosure crisis, many United States cities have lost substantial population in recent decades. This has left municipalities with the task of demolishing abandoned residential structures, creating parcels of vacant land. One such city is Cleveland, Ohio which has over 20,000 vacant lots covering 1,450 hectares of land area. These green spaces have the potential to serve multiple environmental functions including species conservation, storm water retention, and local food production. Worldwide urban agriculture has grown rapidly and requires the work of beneficial arthropods including wild bees for reliable crop pollination. We quantified the current ecological value of vacant land to support bee richness and determined how the conversion of these sites to urban agroecosystems influenced the value of urban greenspace for conservation. Within a network of eight vacant lots and eight community gardens we quantified bee communities using pan traps, left in each site for 24 h monthly (June, July and August 2011-2013). We also examined the structure of plant-pollinator networks in 2011 and 2014 within the same sites by observing all flowering plant species for 10 minute intervals, and colleting all bee visitors. We have documented 104 bee species from Cleveland urban ecosystems, which represents approximately 20% of Ohio’s fauna. We did not find a significant difference in the abundance or species richness of bees found within vacant lots versus urban farms, however, these habitats supported unique communities. Floral observations demonstrated that a similar number of floral resources were present within both habitats, but a greater richness of resources were visited in urban farms leading to reduced nice overlap among species. Our results demonstrate the importance of maintaining a diversity of greenspace within the urban landscape. Even small scale changes in patch composition and management can influence their conservation value for bee biodiveristy.

Wednesday April 11, 2018 10:45am - 11:00am CDT
Grant Park Parlor