Silent lakes ahead? Long-term study finds common loon productivity is dropping across North America
The eerie call of the common loon has long been the sound of North America's northern lakes, but new research shows it may not be that way in the future. A new study led by Birds Canada analyzed breeding attempts across nine Canadian provinces and seven U.S. states. The researchers found a widespread, long-term plunge in loon chick production across their range.
The common loon, a familiar inhabitant of North American lakes, may face an uncertain future. A long-term study led by Birds Canada reveals a troubling decline in loon chick production across 12 regions, including Atlantic Canada and the prairie provinces. Over 49 years, researchers analyzed 45,591 breeding events, finding that chick production has plummeted in 11 of the 12 areas studied.
Notably, cumulative losses reached 74% in Atlantic Canada and 65% in the prairie provinces since 1992. Maine stands out as the only region with a stable productivity trend. The study, published in FACETS, attributes the decline to a combination of human-induced disturbances and climate change factors. These include extreme rainfall events that disrupt breeding, lead fishing tackle, methylmercury contamination, lake acidity, shoreline development, and increased predation by bald eagles.
Despite high adult survival rates, which can temporarily mask the issue, the sustained drops in chick production serve as a critical warning sign of impending adult population declines. This extensive study, involving scientists from Birds Canada, universities, government agencies, and conservation organizations, highlights the urgent need for targeted conservation efforts to save loon populations across their range.
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