Auburn University professor’s study finds size of urban green spaces attracts greater biodiversity

Large swaths of green space found to attract more birds, other species
Published: December 15, 2020
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A recent study co-authored by an Auburn University professor, utilizing nearly two decades of data on birds inhabiting New York City parks, answers longstanding questions about how well urban green spaces function to protect biodiversity, particularly the varieties of bird species.

Professor Christopher Lepczyk of Auburn’s School of Forestry and Wildlife Sciences said the study, published in the international journal, Landscape and Urban Planning, examined three major aspects of urban green spaces—isolation, shape and area—to determine which provided the strongest support for biodiversity.

The researchers found the size of urban green space’s area—not its shape or isolation—most strongly corresponds with the richness of bird species in these spaces, both annually and seasonally.

“A long-running question in conservation has been whether the amount of area that is protected matters more than the protected area’s shape or isolation,” said Lepczyk, professor of wildlife biology and conservation. “To test these ideas, we used parks in New York City in which citizen scientists have collected a treasure trove of bird data, providing a very large number of species and parks for analysis.”

The study used data on collected over an 18-year period by the citizen science group, eBird.

“What we found was that how isolated a park was relative to other parks, and the park shape, were not important in describing the number of unique birds found in a given park,” he said. “Rather, the total amount of area was the most important aspect of the park.”

Lepczyk said urban green spaces are valuable stopover sites for migrating birds during spring and autumn migrations.

The new research has broad implications in the planning of new green spaces, as growing urbanization leads to increasing habitat loss and the introduction of non-native species.

“Taken as a whole, our work suggests that larger parks contain more unique birds, and thus, greater biodiversity,” he said. “For conservation and management, as we consider increasing urban green spaces, we should invest in larger spaces over smaller ones.”

Lepczyk co-authored the study with Frank A. LaSorte of the Cornell Lab of Ornithology, Myla F. J. Aronson of the Department of Ecology, Evolution and Natural Resources at Rutgers University and Kyle G. Horton of the Department of Fish, Wildlife, and Conservation Biology at Colorado State University.

Janaki Alavalapati, dean of Auburn’s School of Forestry and Wildlife Sciences, said the findings are likely to bring about significant innovation in the development of urban green spaces.

“Dr. Lepczyk and his team have answered questions that are of vital importance to conserving wildlife and maintaining species biodiversity in urban spaces,” Alavalapati said.

The Auburn University School of Forestry and Wildlife Sciences is a flagship institution for natural resources-based degrees including natural resource management, geospatial and environmental informatics, and sustainable biomaterials and packaging. The school is also the backbone to Alabama’s $24 billion forest, wildlife, and natural resources industry. Its mission is to create future professionals and leaders, to develop new knowledge and science-based solutions, and share them with individuals, families, communities, and industries so that they can make informed decisions to advance their business and well-being.