What is it about?
Every year, millions of wild ducks and geese travel along the East Asian–Australasian Flyway. Many of their stopovers sit next to places where lots of chickens and ducks are raised. That makes this region a prime meeting point for avian influenza viruses. We asked a simple question: do recent changes to the landscape, such as shrinking wetlands in the south and shifting rice fields, make it easier for new virus strains to appear? We combined real tracking data from tagged geese, citizen-science bird observations, detailed maps of wetlands and rice paddies, and poultry locations. We used these data to run computer simulations of migration and infection under two snapshots of the landscape: the year 2000 and the year 2015. We found that Northern wetlands allowed birds to spread out during the breeding season, but the loss of winter wetlands farther south squeezed large numbers of birds into fewer places. Many of those places are rice–wetland mosaics near dense poultry farms. That crowding led to more chances for wild birds and poultry to interact and for birds to carry more than one virus strain at a time, conditions that make “genetic reassortment” more likely. As a result, areas at risk for new virus strain/subtype grew larger and shifted across parts of eastern and northeastern China.
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Why is it important?
How we manage our landscape can raise or lower the chances of avian influenza virus strains emerging. Protecting and restoring wetlands can reduce crowding; smarter management of rice–poultry interfaces can limit risky contact; and linking satellite data, bird tracking, and farm reports can provide earlier, more targeted warnings. In short, caring for habitats is also caring for public health.
Perspectives
This study reminds me that everything in nature is connected: when we change wetlands or rice landscapes, we also change where birds gather, and that can further influence new virus strain emergence. Highly pathogenic avian influenza hasn’t just hit wild birds and poultry, it’s also spilled into U.S. dairy cattle and caused a small number of human infections. We can’t really manage wild birds like livestock, but we can manage the poultry side and the places where wild birds and poultry meet, especially in rice–poultry landscapes, by tightening biosecurity and building earlier warning systems. And in the spirit of James Lovelock’s “sustainable retreat,” we could consider pulling certain high-risk activities back from sensitive habitats, and/or just consuming a little bit less poultry products where it is practical.
Shenglai Yin
University of Oklahoma
Read the Original
This page is a summary of: Landscape changes elevate the risk of avian influenza virus diversification and emergence in the East Asian–Australasian Flyway, Proceedings of the National Academy of Sciences, August 2025, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2503427122.
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