Mercury exposure and isotopic signatures in overwintering Black-headed Gulls (Chroicocephalus ridibundus): Age-related variation and origin tracing

Key Points

• Mercury exposure varies significantly with age in black-headed gulls, impacting their health and behavior.
• Younger black-headed gulls have higher mercury levels compared to adults, suggesting dietary differences.
• Analysis involved collecting isotopic signatures to trace the origins of the gulls and their exposure sources.
• Understanding these variations highlights the need for monitoring mercury levels to protect avian wildlife.