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# Urban bird planning may need different green-space geometry for residents and migrants
- URL: https://intelligence.wildlandseco.com/2026-09-16-nanjing-urban-birds-green-space-configuration/
- Published: 2026-09-16T12:13:06.000Z
- Updated: 2026-09-16T12:13:06.000Z
- Description: More than 116,000 citizen-science records from Nanjing suggest compact green-space concentration and distributed green share can favor different bird groups depending on season and total green cover.
- Author: Benjamin Worlund
- Tags: urban ecology, birds, green space, land sparing, land sharing, Nanjing, Cities, Wildlife, Land, Methods, #ecological-intelligence, #brief-2026-09-16, #landscape-city-watch, #peer-reviewed, #geo-asia

Evidence

Peer-reviewed

Geography

Nanjing, China

System

Urban green-space network on the East Asian–Australasian Flyway

## WHAT THE EVIDENCE SAYS

Researchers analyzed 116,387 citizen-science bird records from 2022–2024 across Nanjing and compared land-sparing and land-sharing patterns at multiple spatial scales. Concentrated green space tended to support higher diversity, especially for resident birds where total green cover was below about 50%, while more distributed green share could favor migrants in greener landscapes and during non-breeding periods. Human footprint was a consistent predictor, and several sparing-versus-sharing contrasts were not statistically significant.

## WHY IT MATTERS / OUR READ

Urban biodiversity design may not have one universal green-space geometry. Residents and migrants use the city differently, and the useful scale of planning may be neighborhood-sized rather than parcel-sized. That argues for network design based on movement and seasonal function, not only total acreage.

## CAVEATS / UNCERTAINTY

Citizen-science records are uneven in observation effort and the study is observational. The reported threshold-like patterns should not be treated as a fixed 50% design standard, and effects may differ among cities with different climates, species pools and urban forms.

## SOURCE

Landscape Ecology · Original evidence  
[View original evidence ↗](https://link.springer.com/article/10.1007/s10980-026-02451-7?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-09-16

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-09-16/)