Seabirds' blood can hold vital clues about the long-term ecological impacts of oil spills, researchers suggest.Scientists collected samples from gulls in north-west Spain, close to where the Prestige tanker sank in November 2002.
Seventeen months after the disaster, concentrations of toxic compounds in the birds' blood were, on average, 120% higher than normal.
The team hopes its findings will offer a way to collect data about oil spills' accumulative effect on wildlife.
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