Workshop and Tour on August 19

From Blight to Bright: Reimagining vacant land to support people and biodiversity in cities

Are you interested in urban conservation? A field tour and workshop on August 19 hosted by Dr. Mary Gardiner and her Laboratory will highlight the importance of vacant land as a habitat for insects and source of many important ecosystem services we derive from our landscape. Speakers will  address the community of insects found in vacant lots, balancing the needs of people and insects in vacant lot design, how to establish native plants in degraded habitats, community gardening, and the importance of the urban forest. The city of Cleveland, OH manages over 30,000 vacant lots. Although these properties can be seen as blight, there are also many exciting ways to reimagine these greenspaces to promote conservation and community goals.

See the workshop schedule here: Blight to Bright – A Workshop on August 19 in Cleveland

Register here



New Bee Factsheet!

Gardiner Lab alum MaLisa Spring has produced a new OSU Extension Factsheet titled: How to Identify and Enhance Wild Bees in Your Landscape (see link below to download). MaLisa’s MS thesis focused on the wild bees that forage in Cleveland vacant lot habitats. She is also an avid nature photographer, and some of her great bee shots are featured!

Entomology 85 2019-0524

Urban Greenspace Manager Position

The Gardiner Lab in the Department of Entomology at The Ohio State University seeks a Summer Urban Greenspace Manager. This individual will be responsible for maintaining (including mowing, trimming, mulching, weeding, and trash removal) a network of urban vacant lot greenspaces. The selected candidate will also assist Mary Gardiner with establishing experiments and collecting data from the vacant lot sites.  These habitats were established in 2014 and the Gardiner Lab is examining their value for arthropod conservation. The individual selected for this position must be able to drive, operate equipment such as lawn mowers and weed whips, and enjoy working independently and be comfortable interacting with the public.

This job is titled Research Assistant 1 in the OSU system will be posted for 2 weeks (March 19-31) and can be found here:

The position runs from May 1 to October 15, with an earlier start date possible.

Site photos and details here:

Contact Mary Gardiner ( with questions related to the position after reviewing the full announcement.

Pollinator Field Day at Midtown Learning Farm!

Graduate student Katie Todd and undergraduate Mike Friedman recently presented their research as part of an Ohio Ecological Food and Farm Association Field tour. The field day was held at the Cleveland Botanical Gardens Midtown Learning Farm. Midtown is one of first of now several CBG urban farms that employs Cleveland youth in a summer work-study program. Katie and Mike put together an educational display including bee nests, pinned specimens, and a handout explaining their research, which focuses on the value of urban greenspaces as a nesting habitat.

Does Competition for Food Result in Lady Beetle Decline?

Graduate student Denisha Parker is going to determine if native lady beetles that have remained common following the introduction of exotic species have a low degree of dietary niche overlap with their competitors. If this is true, it would aid in our understanding of why some species have declined dramatically following exotic introductions while others have remained. Denisha was recently awarded a highly competitive North Central Region Sustainable Agriculture Research and Education Graduate Student Grant ($11,924) to support her work. She will be collecting two species of lady beetles (checker-spot lady beetle (exotic) and orange spotted lady beetle (native)) from our control and high-diversity wildflower vacant lot plots as well as urban farms using sweep nets and sticky traps. Using molecular gut content analysis she will determine the diet of these species and determine how much overlap exists and if it varies by foraging habitat.

Project Description: Native lady beetles are an important group of urban agricultural predators, but in recent decades many have declined dramatically coinciding with introductions of exotic lady beetle competitors. We will determine if the degree of overlap in predator diet, a form of exploitative competition, explains why some native species have declined while others have remained common following exotic establishment.  Using this information, we can manage greenspaces to both conserve native biodiversity and promote urban farm sustainability.



Does Cd Contamination Influence Pollination?

Rachel McLaughlin is an undergraduate researcher in the Gardiner Lab, mentored by Frances Sivakoff. With an undergraduate grant and support from our recent USDA AFRI, Rachel and Frances are studying how soil contamination with cadmium influences the number and length of pollinator visits to sunflowers. Cadmium is found in elevated concentrations in many urban soils with an industrial past, including Cleveland, OH where much of our research takes place. This experiment was conducted on the OSU campus adjacent to a demonstration urban farm, and follows up on research recently published by Sivakoff and Gardiner (Urban Ecosystems, in press), which documented that lead contamination of soils reduced the visit duration of bees to sunflowers.

DNA Methods to Map Important Bee Forage in Cleveland

Over the past year, graduate students Rodney Richardson and Katie Todd have co-authored, and were awarded, two student grants to conduct pollen research in Cleveland, OH. Rodney and Katie are supported by a North Central Region SARE graduate student grant ($11,930) and an OARDC SEEDS graduate student grant ($9,775) to investigate solitary bee’s pollen usage on urban farms. They are mid-way through their first year of pollen collection and will use pollen metabarcoding DNA analysis this fall to determine what their bee larvae were eating in Cleveland this summer. Check out the photos below to see some of their sites and bee X-rays!

Project Summary: Urban agriculture is highly reliant on the pollination services that wild bees provide. In order to support pollinator’s survival and reproduction, we need to supply both crop and non-crop pollen resources for these bees. However, we don’t have a clear picture of what solitary bees feed their young in urban farm environments. Therefore, we don’t know what flower plantings will best support local bees. In order to test what bees eat in urban farms of Cleveland, OH, we will collect bee larvae and pollen with “Bee Hotel” trap nests. We will then conduct a DNA analysis on the pollen within these nests in order to determine what floral resources are critical for solitary bee reproduction. With this insight into urban bee foraging behavior and reproductive success, our study will inform farmers about urban habitat management to support future generations of urban bees and urban farm sustainability.

ciCLEvia Central Event

Graduate Student Denisha Parker, undergraduate Ryan Byler, and Mary Gardiner participated in a fun outreach event on Sunday showcasing the Central Neighborhood of Cleveland, OH. Community College Avenue was closed to traffic from 1-5 pm on Sunday 7/16/17 allowing families to walk among five activity hubs. One of our prairie sites fell within the arts and culture hub. We had the opportunity to meet our neighbors, talk with community members about our study, and most importantly collect some bugs with a great group of children. Below are some photos of Denisha and Ryan helping the budding entomologists to wrangle their catch!

Paper Examines Value of Exotic Trees

Chris Riley, Dan Herms, and Mary Gardiner recently published a paper as part of a special issue of Urban Forestry and Urban Greening titled: Exotic trees contribute to urban forest diversity and ecosystem services in inner-city Cleveland, OH.

This study highlights the importance of vacant land to the urban forest – these sites had three times as many trees as residential sites! The majority of trees found on vacant land are exotic and naturally regenerated. This weedy forest, such as the tree-of-heaven individuals which have sprouted up alongside the abandoned building in the photo below are not traditionally thought to provide any benefits in their invaded ecosystems. But, in inner-city Cleveland exotic trees are providing many ecosystem services such as energy cost reduction, pollution removal and increased storm water infiltration. How the presence of these species influences the biodiversity of tree-dwelling herbivores and their predators in vacant lots is currently being investigated by Chris Riley.

Our paper was recently featured in the Anthropocene Weekly Science Magazine and is also highlighted on the OSU Grant development Support Unit Website.