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Loon Eggs Reveal Alarming Chemical Cocktail
16 Jul
Summary
- Unprecedented dangerous chemical levels found in New Hampshire loon eggs in 2023.
- All tested loon eggs contain at least some concerning chemicals, researchers confirm.
- Lead tackle and various chemical pollutants threaten loon populations and ecosystems.
Researchers in New Hampshire are increasingly concerned about the health of loons and their aquatic ecosystems due to alarming levels of dangerous chemicals found in loon eggs. Initial findings in 2023 revealed unprecedented contamination, with ongoing testing confirming the widespread scope of pollutants impacting wildlife.
All tested loon eggs, including those from Squam Lake, have shown positive for concerning chemicals, with some levels significantly higher than those found in other lakes. These contaminants include PFAS, PCBs, DDT, dioxins, furans, and BDEs, with PFOS being the most prevalent PFAS chemical. Some eggs exhibited PFOS levels known to impact other bird species.
Lead fishing tackle remains a primary cause of adult loon mortality in New Hampshire. However, chemical pollutants like PFAS, DDT, and others accumulate more gradually through biomagnification and bioaccumulation, posing a long-term threat. Loons, as long-lived birds high on the food chain, are particularly susceptible.
While loon populations are slowly recovering, pollution is hindering their progress. Researchers are investigating the links between "forever chemicals" in eggs and reproductive success, as well as the broader ecosystem and human health implications. Efforts are underway to trace pollution sources, particularly on Lake Winnipesaukee, and to implement fish testing programs.
