Sentences with phrase «polar skuas»

The researchers first captured around a hundred south polar skuas and brown skuas and took blood samples to measure their mercury levels.

For the first time, the researchers have carried out a ten - year population study of two seabird species: brown skuas living in the Kerguelen Islands (Subantarctic) and south polar skuas living in Adélie Land (Antarctica).

The first finding was that mercury levels in brown skuas were three times higher than in south polar skuas.

Unexpectedly, it is in the least contaminated species, the south polar skua, that the effects of mercury are the most obvious.