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Why birds prefer wealthy neighborhoods in South Africa

Photograph by Ann and Steve Toon, Minden Pictures

A malachite sunbird feeds on a flower in Kirstenbosch National Botanical Garden, about eight miles from downtown Cape Town, South Africa.

Money might not buy happiness, but it can buy biodiversityat least for birds.

Wealthier urban areas across South Africa attract more native bird species than less well-to-do ones, according to a new study. Thats because ritzier neighborhoods contain more green spaces, which provide habitat for the animals.

An African olive pigeon, once the species in the study, is seen at South Africas Montagu Pass.

First identified during a 2003 study of plant biodiversity in Phoenix, Arizona, this so-called luxury effect has since been discovered in a multitude of species, including insects, bats, and lizards.

Large and highly landscaped yards, vegetation in which to hide and raise young, and an abundance of water are all factors that draw in wildlife and plants.

The problem with past studies, says lead author Dan Chamberlain, an ecologist at Italys University of Turin, is that nearly all of them were conducted in relatively affluent countries in North America, Europe, and Australia.

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Urbanization and biodiversity loss, however, are more concentrated in parts of South America, Southeast Asia, and Africa. (See how inequality can be viewed from above.)

Now, Chamberlain and colleagues have confirmed the luxury effect exists in South Africaand theyre calling on urban planners to ensure that everyone has access to nature.

The scientists propose that half of all the worlds urban areas be devoted to parks and other green spaces, for the benefit of people and wildlife alike.

The wealthy have access to the benefits of green spaceswhy should poor people be starved of that?

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What makes South Africa an appealing study site is its high levels of income inequality, as well as burgeoning urban areas with housing ranging from wealthy, Westernized dwellings to slums, Chamberlain says. (Heres what future cities could look like.)

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Using data from the second South African Bird Atlas Project, a citizen science initiative in which volunteers identified bird species seen during timed visits to specific areas, Chamberlain and colleagues from the universities of Cape Town and Witwatersrand measured the biodiversity of native birds across different landscapes in 22 urban areas.

The team found that in both the suburbs and periurbsthe transition zone between city and rural areasmore wealth meant more of both green space and native bird species.

In dense city centers, however, they found the opposite effect: In all areas, more tree and vegetation cover meant more birds, such as the African marsh harrier and the greater striped swallow, according to the study, published recently in the journalGlobal Change Biology.

Related: National birds from around the world (Photos)

A quantitative analysis revealed that the luxury effect kicked in once pavement, dwellings, and other urban cover exceeded 38 percent.

Its great that they calculated the number, says Michelle Trautwein, an entomologist at the California Academy of Sciences who has researched the luxury effect. In a 2016 study, she found wealthy homes in North Carolina host more insect species than does lower cost housing.

Its such a compelling conceptI loved that they quantitatively did that.

How feasible their recommendations are about increasing green space is another question, she adds.

Paige Warren, an urban ecologist at the University of Massachusetts, says the study shows how scientists have to expand their toolbox to understand the urban environment.

We cant understand where birds are without understanding how humans shape habitats, she says.

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