Determinates of inner city butterfly and bee species richness

Although urbanization is increasing worldwide, relatively few studies have investigated patterns of urban biodiversity outside of city parks and reserves, in urban neighborhoods where people live and work. We evaluated models including local and landscape factors that might influence the bee and but...

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Bibliographic Details
Published in:Urban ecosystems 2010-09, Vol.13 (3), p.333-347
Main Authors: Matteson, Kevin C, Langellotto, Gail A
Format: Article
Language:English
Subjects:
Biodiversity
Biomedical and Life Sciences
community gardens
Ecology
Environmental Management
Gardens & gardening
Green space
Inner city
Insects
Life Sciences
Modeling species richness
Nature Conservation
Neighborhoods
New York City
Plant reproduction
Pollinators
Urban biodiversity
Urban Ecology
Urban farming
Urbanization
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Summary:Although urbanization is increasing worldwide, relatively few studies have investigated patterns of urban biodiversity outside of city parks and reserves, in urban neighborhoods where people live and work. We evaluated models including local and landscape factors that might influence the bee and butterfly richness of community gardens located within densely populated neighborhoods of the Bronx and East Harlem in New York City (>10,000 people/km²). The gardens were surrounded by buildings and limited amounts of green space (3,600-17,400 building units and 10-32% green space within a 500 m radius). Contrary to our initial prediction that landscape green space might be especially influential in this heavily urbanized setting, the most highly supported models for both bee and butterfly richness (based on Akaike Information Criterion) included just the local, within-garden variables of garden floral area and sunlight availability. There was marginal support for models of bee richness including the number of building units surrounding gardens within a 500 m radius (which exhibited a negative association with bee richness). In addition, perhaps because bees are central place foragers that may nest within or near gardens, supported models of bee species richness also included total garden area, canopy cover, and the presence of wild/unmanaged area in the garden. Generally, our findings indicate that sunlight and floral abundance are the major factors limiting local pollinator diversity in this setting. This suggests that rooftop and other “open” urban habitats might be managed to increase local pollinator diversity, even if seemingly “isolated” within heavily developed neighborhoods.
ISSN:1083-8155
1573-1642
DOI:10.1007/s11252-010-0122-y