--- title: "Domesticated ducks alter wild mallard genetics in North America" url: https://newscentral.site/domesticated-ducks-alter-wild-mallard-genetics-in-north-america/ language: en publisher: "News Central Site" section: "Science" published: 2026-11-05T12:40:06.000Z updated: 2026-11-05T13:34:38.218Z id: b1ba94ec-90e7-4fcb-914f-7dc2826f9419 source: "Phys.org https://phys.org/news/2026-11-historic-duck-dna-wild-mallard.html" attribution: "Link to https://newscentral.site/domesticated-ducks-alter-wild-mallard-genetics-in-north-america/ and name News Central Site when you quote or summarize this story." --- # Domesticated ducks alter wild mallard genetics in North America A recent study has found that domesticated ancestry exists within wild mallards in North America, with researchers tracing genetic changes back to specific events. Researchers have long understood that releasing domesticated ducks can alter the genetic makeup of wild populations. A recent study, led by a doctoral student at The University of Texas at El Paso, has shed light on this phenomenon in North America for the first time. The study reveals that domesticated ancestry exists within wild mallards, but until now, it was unclear how this came to be. Lauren McFarland, a doctoral student in ecology and evolutionary biology, explained that by examining historical records of duck releases, researchers were able to connect genetic changes in the birds' DNA to human activities. McFarland's team found a direct link between the release of domesticated ducks over more than a century and the introduction of new genetic traits into wild populations. This discovery provides wildlife managers with valuable information about the impact of such practices on wild duck populations. The study demonstrates that genetic changes in wild mallards can be traced back to specific events, giving researchers a clearer understanding of how human activities shape the evolution of wild species. The study's findings also highlight concerns about the genetic health of wild mallards. Birds with a higher proportion of game-farm ancestry were found to be less genetically diverse and more inbred than their wild counterparts. This reduced diversity is a key concern as it can make populations more vulnerable to disease and environmental changes. Genetic diversity is essential for allowing wild populations to adapt and respond to changing conditions. However, the interbreeding between wild mallards and domestic stocks can erode local adaptations and increase the burden of genetic variants that are detrimental to the health of wild populations. The risk of weakened immune defenses is also a concern in light of ongoing avian influenza outbreaks. The research team's analysis of genetic data from museum specimens dating back to 1800 provides valuable insights into the history of North American mallards. By examining over 400 historical samples and more than 600 contemporary birds, they were able to reconstruct the genetic history of these populations over time. The large-scale releases of domesticated ducks for hunting have had a significant impact on the ancestry of wild mallards in eastern North America. These human activities have altered the genetic makeup of wild populations, leading to changes in their diversity and adaptability. The genetic impact of releasing captive-bred ducks into the wild has been a long-standing concern for wildlife conservationists. Scientists at several institutions collaborated on a study to investigate the effects of this practice on North America's wild mallard population. The researchers analyzed DNA samples from across four major migratory flyways, allowing them to compare regions with varying histories of stocking. This approach enabled them to pinpoint when and where game-farm ancestry first entered wild populations. Historical records indicate that releases of captive-bred ducks began in the early 20th century. The study found that the first signs of game-farm mallard ancestry appeared in wild ducks during the 1910s and 1920s, coinciding with documented stocking activities. The effects of this genetic influx were not uniform across different regions. While mallards in the Pacific and Central flyways retained a strong connection to their wild ancestors, those in other areas showed significant levels of domestic ancestry. In particular, the Atlantic Flyway saw a notable increase in game-farm ancestry since the 1980s, with mallard populations averaging around 20% domestic ancestry. The study's findings have significant implications for wildlife conservation efforts across North America and beyond. A notable trend emerged from the data analysis: the Atlantic Flyway saw a substantial increase in game-farm ancestry among mallard populations since the 1980s, with an average of around 20% domestic ancestry present in these birds. This suggests that the release of non-native ducks into the wild has had a lasting impact on the genetic makeup of local populations. The researchers' data also revealed significant differences in the genetic characteristics of mallards across various regions. The study's results underscore the importance of considering the long-term effects of introducing non-native species into the wild, and highlight the need for more comprehensive conservation strategies to protect native wildlife populations. By shedding light on the complex dynamics of duck populations, this research aims to inform decision-making processes that go beyond the laboratory, with far-reaching implications for wildlife conservation efforts. This pioneering work sets a new standard for interdisciplinary research in the field. --- Source: [Phys.org](https://phys.org/news/2026-11-historic-duck-dna-wild-mallard.html) Published by News Central Site: https://newscentral.site/domesticated-ducks-alter-wild-mallard-genetics-in-north-america/