Research & reports

Mary M. Gardiner, Caitlin E. Burkman, Scott P. Prajzner · Environmental Entomology · United States

This article discusses the ecological value of urban vacant land in the United States, particularly its role in supporting arthropod biodiversity and ecosystem services. It notes that vacant lands can offer opportunities to preserve declining species and restore ecosystem functions. The article emphasizes the need for quantifying the current ecological value of vacant land and assessing how changes in its ecosystem management affect biodiversity and ecosystem processes, with a specific focus on arthropods.

Klaire Elise Freeman · OhioLink ETD Center (Ohio Library and Information Network) · United States (Cleveland)

A study in Cleveland, Ohio, examined the role of wasps in urban gardens and vacant lots, collecting 13,339 arthropods, including 5,165 wasps across 24 families and 369 morphospecies. The findings showed higher wasp abundance, species richness, and number of families in vacant lots compared to urban gardens. Specifically, vacant lots had 2,703 individuals and 288 morphospecies, while gardens had 2,462 individuals and 231 morphospecies.

Kevin C. Matteson, Gail Langellotto · Cities and the Environment · United States (New York City)

This study used mark-recapture and translocation experiments to assess the residency and movement of the urban butterfly, Pieris rapae, within and among community gardens in New York City. While most marked butterflies used gardens transiently, recruitment and residence time were higher in larger gardens and those with more flowers. The study demonstrated the butterfly's ability to move through developed landscapes and locate floral resources.

서명훈, 이원석, 전명희, 김성기 · · South Korea

In South Korea, urban agriculture is being revitalized with the enactment of urban agriculture-related laws in 2011 and active promotion by local governments. The total urban agriculture area in Seoul and Gyeonggi regions is 251.6 ha, and urban gardens with diverse crops exhibit biodiversity, allowing for relatively flexible insect life cycles. However, challenges include unauthorized biological and chemical pest control due to multiple people managing small areas, and the absence of winter crops due to limited usage periods. Environmentally friendly insect management, utilizing natural enemies, traps, and biodiversity, is necessary for urban gardens.

Kevin F. Welzel · Berkeley Scientific Journal · United States (California)

This study examined native bee pollination at two urban agricultural sites in Berkeley, California: the Oxford Tract and Berkeley Youth Alternative garden. It observed squash, tomato, strawberry, and sunflower plants, collecting data on distance from natural habitat, native bee pollinator diversity, and visitation rates. The study found mixed results for genus richness and evenness, and a t-test indicated no significant difference in visitation rates for each plant type between the two sites.

Yaril Matienzo Brito, Marlene M. Veitía Rubio, Giraldo Alayón García · Fitosanidad · Cuba

This study identified the species that most frequently visit flowers of different plant species in urban agricultural systems, using weekly simple random sampling in different production systems of Havana province during 2007-2009. Functional groups with higher species richness associated with the flowers were Coleoptera, Araneae, and Hymenoptera, in that order. Cycloneda sanguinea limbifer Casey and Apis mellifera L. were arthropods that visited a greater number of flowering plant species.

Hongyuan Li · Bulletin of Soil and Water Conservation · China (Tianjin)

An investigation of wild flowers in urban areas of Tianjin City was conducted from 2005 to 2010. The study examined the ecological habits, life forms, and distribution of each species, identifying six distinct distribution patterns: single, linear, scattered, assembled, radial, and climbing. Following an analysis of these patterns' characteristics, the potential use of these wild flowers in urban gardening was discussed.

Sarah Mead-Willis · The Deakin Review of Children s Literature · United States (Brooklyn)

"The Honeybee Man" by L. Nargi is a 2011 picture book about Fred, a Brooklyn resident who keeps three honeybee colonies on his townhouse roof. The book illustrates Fred's urban beekeeping, showing how his bees collect nectar across the borough and how he harvests and distributes honey to neighbors. It aims to educate young families about local ecology and human community, explaining bee behavior and the processes of beekeeping and honeymaking.

Kevin C. Matteson, Gail Langellotto · Urban Ecosystems · United States (New York City)

A study in community gardens in densely populated Bronx and East Harlem, New York City, evaluated local and landscape factors influencing bee and butterfly richness. Contrary to predictions, models showed that within-garden variables like floral area and sunlight availability were the most influential factors for both bee and butterfly richness. Marginal support was found for models of bee richness including the number of surrounding building units, which showed a negative association.

Kevin C. Matteson, Gail Langellotto · Insect Conservation and Diversity · United States (New York City)

The ability of adding 70 plants of seven native wildflower species over two years to augment beneficial insect richness, including bees, butterflies, and predatory wasps, was assessed in New York City community gardens. Bayesian analyses failed to find a strong influence of the native plant additions on beneficial insect richness, even after correcting for prior floral abundance. Butterflies and megachilid bees were found to heavily utilize introduced ornamental and crop flowers in these gardens, even when native flowers were present.

Lucy Bastin · · United Kingdom

Against a backdrop where about 90% of UK residents already live in towns or cities, and roughly 60% of the world's population is projected to live in urban areas by 2030, this essay argues that public land such as parks and allotments can easily be lost without a vocal set of "owners" to speak for it. It notes that most of the UK's "natural" areas have historically been created, managed, or modified by humans, and that overlooked brownfield sites can serve as valuable refuges for insect and plant species that can no longer persist in a countryside dominated by industrialized agriculture.

Colla S.R., Willis E., Packer L. · Cities and the Environment (CATE), 2(1):4 · Canada (Toronto area)

A foundational study comparing bee diversity and abundance on green roofs and ground-level sites near Toronto. With suitable plants and management, green roofs can host bee communities comparable to ground habitats, discussing implications for urban pollinator conservation and rooftop agriculture.

Kevin C. Matteson, Gail Langellotto · Cities and the Environment · United States (New York City)

In 2005, a study compiled a list of crop plants in 19 New York City community gardens, classifying them by bee pollination dependence. Using mark-recapture methods, the abundance of the common eastern bumble bee (Bombus impatiens) was estimated. Wild populations of B. impatiens were found to be abundant in New York City community gardens, where it is the most prevalent native bee species and visits various crop flowers.

Karin Ahrné, Jan Bengtsson, Thomas Elmqvist · PLoS ONE · Sweden (Stockholm)

This study investigated bumble bees in allotment gardens along an urbanization gradient from inner Stockholm to rural areas. Findings showed that bumble bee diversity decreased with increasing urbanization, from approximately eight species in rural areas to five to six species in urban allotment gardens. Higher variability in the abundance of certain species in the most urban areas suggested a potentially weaker reliability of the pollination ecosystem service in areas strongly influenced by human activity.

Eric G. Strauss · Cities and the Environment · Global

This issue of CATE is dedicated to the theme of urban pollinators in relation to community gardens, addressing a gap in knowledge regarding pollinator ecology in urban landscapes. It notes that while pollinators' roles in agricultural systems are well-studied, their impact in community gardens is less understood. Six papers in this issue explore these questions, aiming to provide a foundation for understanding urban pollinators and guiding future research and management.

J. C. Pawelek, Gordon W. Frankie, Robbin W. Thorp, Maggie Przybylski · Cities and the Environment · United States (California)

A community garden in San Luis Obispo, California, was modified by planting bee-attractive plants to attract native bee pollinators. Garden modification and monitoring of native bees occurred from 2007 through the 2009 growing season. The diversity of collected and observed native bees increased each year, with 40 species in 17 genera recorded to date.

Peter A. Werrell, Gail Langellotto, Shannon U. Morath, Kevin C. Matteson · Cities and the Environment · United States (New York City)

A study in New York City community gardens examined how the spatial area dedicated to cucumbers (Cucumis sativus), relative to other flowering plants, influenced the deposition of conspecific and heterospecific pollen on cucumber plants, and also examined the effect of overall garden size on that pollen deposition. Female flowers were collected from potted cucumber plants placed experimentally in the gardens for the study, as well as from cucumbers established in raised beds by community garden members; pollen grains were isolated in the laboratory by acetolysis and the numbers of heterospecific and conspecific pollen grains were quantified. The abstract does not report quantitative results or conclusions.

Stephan Barthel, Carl Folke, Johan Colding · · Sweden (Stockholm)

This thesis investigated how social-ecological features influence ecosystem service (ES) generation through case studies in Stockholm, Sweden. Findings indicated that urban ES flows are products of co-evolutionary processes, requiring governance to consider historical rights and diverse actor groups. Informally managed allotment gardens showed higher pollinator abundance compared to other urban green spaces, and social-ecological memory among gardeners was found to retain and transmit practices linked to ES generation. The study concluded that sustaining urban ES depends on management practices by people and local communities of ecosystem practice.

Henrik Ernstson, Stephan Barthel, Erik Andersson, Sara Borgström · · Sweden (Stockholm)

This thesis investigates social-ecological features shaping the generation of ecosystem services (ES) in the urban landscape of Stockholm, Sweden. Through interdisciplinary case studies, it showed that informally managed allotment gardens have a higher abundance of pollinators, and voluntary actor groups motivated by a sense-of-place support ES generation. Social-ecological memory among allotment gardeners retains and transmits practices linked to ES, suggesting that sustaining urban ES requires considering historical property rights, diverse actor groups, and local communities of ecosystem practice.

Kevin C. Matteson, John S. Ascher, Gail Langellotto · Annals of the Entomological Society of America · United States (New York City)

Bees were surveyed over 4 years in community gardens in heavily developed neighborhoods of the Bronx and East Harlem, New York City, yielding 1,145 individuals from 54 species (13% of recorded New York State bee fauna). Soil-nesting individuals were relatively rare (25%), possibly due to a lack of suitable nesting soils, and parasitic species were scarce (5.6% of species, 2.6% of individuals); exotic species were common, comprising 27% of individuals and 19% of species collected. Compared with other bee faunal surveys in New York and New Jersey, including Central Park and Prospect Park, bee richness in these urban gardens was reduced and the species composition was biased toward exotic and cavity-nesting bees, though the gardens still supported a diverse bee assemblage despite their small size and location within highly urbanized areas.

Lee M · PubMed · Ethiopia

In Ethiopia, urban agriculture faces significant challenges due to government disapproval of public land use for farming and difficulty in obtaining credit. A 1983 survey in Addis Ababa found that 17% of 1352 households produced their own food on less than 25 sq. meters, with 90% of non-farmers citing lack of land. Despite urban agricultural cooperatives demonstrating 70% higher member income, their lack of government legalization prevents access to loans for productivity improvement.