Ducks' range study and flu spread
Researchers at the University of Georgia reported that ducks travel shorter distances when habitat needs are met, a behavior finding that could influence models of how avian flu spreads via wild birds. (gpb.org) The study suggests habitat management could change movement‑based risk assessments used by animal‑health agencies. (gpb.org)
Bird flu does not move only on migration routes; a University of Georgia study found ducks and other waterfowl often stay close to home when food, water and cover are nearby. (gpb.org) The study, published in *Ecology Letters*, combined tracking data from 4,606 waterfowl across 26 species over 20 years in the Northern Hemisphere. Lead author Claire Teitelbaum is an adjunct assistant professor at Georgia and an assistant unit leader with the United States Geological Survey. (onlinelibrary.wiley.com) Researchers measured the short “commute” trips birds make between resting and feeding areas during breeding and winter, not just their long seasonal migrations. They found birds in grasslands and farmlands traveled about six times farther than birds in more mixed landscapes. (eurekalert.org) In more varied places, including wetlands and urban green spaces, many birds did not need to move more than a mile from their home area to meet most daily needs. The study also found shorter movements in places with higher human population density. (news.uga.edu) That changes the basic disease picture: when birds move less, the virus has fewer chances to spread across long distances, but outbreaks can cluster more tightly where birds concentrate. The researchers linked longer predicted bird movements with avian influenza detections that were farther apart during the current outbreak. (wildlifemanagement.institute) For years, bird-flu models often emphasized migration corridors, because wild waterfowl are natural hosts of avian influenza viruses and can carry them across regions. This study shifts attention to the ordinary daily trips birds make after migration ends. (gpb.org) The paper does not say habitat alone drives outbreaks. The Wildlife Management Institute said livestock production is the primary contributor to outbreaks of highly pathogenic avian influenza, while waterfowl movements also play a role in how the virus spreads. (wildlifemanagement.institute) Teitelbaum said managers could use habitat patterns to estimate where birds are likely to bunch up or range farther, then fold that into outbreak forecasts. Her team’s finding is simple: when ducks can find what they need close together, they usually stop traveling so far. (eurekalert.org)
