Thick-billed murre (Uria lomvia) eggs were collected from four Alaskan colonies in 2002. The contents were analyzed for organic contaminants and carbon (δ13C) and nitrogen (δ15N) stable isotopes. Contaminant concentrations in eggs varied from below detection limits to 230 ng g-1 wet mass for 4,4-DDE in one egg from St. Lazaria Island in the Gulf of Alaska. Eggs from this colony generally contained higher levels of contaminants and had significantly different patterns compared to Bering and Chukchi seas eggs. Stable isotope values also varied geographically; however, these differences appeared to be related to differences in C and N baselines in the food webs instead of differences in prey. Correlations between egg 15N values and contaminant concentrations produced only a few positive slopes, while oxychlordane and mirex displayed significantly negative slopes in eggs from the Chukchi Sea.
Citation: Journal of Environmental Monitoring
Pub Type: Journals
Alaska, Carbon-13, Contaminants, Nitrogen-15, Stable Isotopes, Uria lomvia