Recent changes in levels of persistent organochlorines and mercury in eggs of seabirds from the Barents sea

baltic sea barents sea canada charadriiformes ecologia ecologie ecology efectos secundarios effet secondaire gaviota (laridae) gulls insecticidas insecticide insecticides mar baltico mar barents mer baltique mer de barents mercure mercurio mercury morus mouette nontarget effects ova ovule pelecaniformes population ecology reproduction residues residuos side effects