The role of seabird foraging strategies on the uptake of mercury: A case study using gulls and shearwaters from the Portuguese coast.

Summary: Pollution in our oceans is a growing concern, particularly with toxic metals like mercury. In this study, scientists investigated how mercury builds up in seabirds along the Portuguese coast. By analyzing blood samples from three different species—Yellow-legged gulls, Audouin’s gulls, and Cory’s shearwaters—researchers tracked mercury levels. They also used a clever chemical technique involving "stable isotopes" to determine exactly what the birds were eating and where they were hunting. The study reveals that a bird's specific diet and foraging strategy are the key factors in how much mercury accumulates in their bodies, making them important indicators of ocean health.