Declining Trends of Polychlorinated Naphthalenes in Seabird Eggs from the Canadian Arctic, 1975–2014

There are relatively few studies of polychlorinated naphthalenes (PCNs) for biota in polar regions and even fewer reports of temporal trends. We determined concentrations of PCNs in eggs of thick-billed murres (Uria lomvia) collected from the Canadian high Arctic between 1975 and 2014 and calculated their associated toxic equivalents (TEQs). Concentrations of Σ67PCN decreased significantly in the murre eggs between 1975 and 2014 at an average...