城市中的生物多样性超出预期

The rapid conversion¹ of natural lands to cement-dominated urban centers is causing great losses in biodiversity. Yet, according to a new study involving 147 cities worldwide, surprisingly high numbers of plant and animal species persist and even flourish in urban environments -- to the tune² of hundreds of bird species and thousands of plant species in a single city. Contrary to conventional wisdom that cities are a wasteland for biodiversity, the study found that while a few species -- such as pigeons and annual meadow grass -- are shared across cities, overall the mix of species in cities reflects the unique biotic（生物的） heritage of their geographic³ location. The findings of the study conducted by a working group at UC Santa Barbara's National Center for Ecological⁴ Analysis and Synthesis (NCEAS) and funded by the National Science Foundation were published today in the Proceedings⁵ B, a journal of the Royal Society of Biological Sciences.

 

"While urbanization has caused cities to lose large numbers of plants and animals, the good news is that cities still retain endemic（地方性的） native species, which opens the door for new policies on regional and global biodiversity conservation," said lead author and NCEAS working group member Myla F. J. Aronson, a research scientist in the Department of Ecology, Evolution and Natural Resources at Rutgers, The State University of New Jersey⁶.

 

The study highlights the value of green space in cities, which have become important refuges for native species and migrating wildlife. This phenomenon has been named the Central Park Effect because of the surprisingly large number of species found in New York's Central Park, a relatively⁷ small island of green within a metropolis⁸（大都市）.

 

Unlike previous urban biodiversity research, this study looks beyond the local impacts of urbanization and considers overall impacts on global biodiversity. The research team created the largest global dataset to date of two diverse taxa in cities: birds (54 cities) and plants (110 cities).

 

Findings show that many plant and animal species, including threatened and endangered species, can flourish in cities, even as others decline or disappear entirely⁹. Cities with more natural habitats support more bird and plant species and experience less loss in species as the city grows. Overall, cities supported far fewer species (about 92 percent less for birds and 75 percent less for native plants) than expected for similar areas of undeveloped land.

 

"We do pay a steep price in biodiversity as urbanization expands," said coauthor Frank La Sorte, a research associate at the Cornell Lab of Ornithology¹⁰. "But even though areas that have been urbanized have far fewer species, we found that those areas retain a unique regional flavor. That uniqueness is something that people can take pride in retaining and rebuilding."

 

Conserving¹¹ green spaces, restoring native plant species and adding biodiversity-friendly habitats within urban landscapes could, in turn, support more bird and plant species. "It is true that cities have already lost a substantial proportion of their region's biodiversity," said Madhusudan Katti, a faculty¹² member in the Department of Biology at California State University, Fresno. "This can be a cup half-full or half-empty scenario¹³. If we act now and rethink the design of our urban landscapes, cities can play a major role in conserving the remaining native plant and animal species and help bring back more of them."

 

The human experience is increasingly defined within an urban context, the authors noted¹⁴. They maintain it is still possible for a connection to the natural world to persist in an urban setting, but it will require planning, conservation and education.

 

"Given that the majority of people now live in cities, this group's synthesis of data on plant and urban plant and animal diversity should be of broad interest to ecologists as well as urban and landscape planners," said Frank Davis, NCEAS director.

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