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Westerbom, M., Kilpi, M. & Mustonen, O. 2002. Blue mussels, Mytilus edulis, at the edge of the range: population structure, growth and biomass along a salinity gradient in the north-eastern Baltic Sea. Marine Biology 140: 991-999. Wetlands International. 2012. Waterbird Population Estimates. Retrieved from wpe.wetlands.org on Thursday 24 Jul 2014. Žydelis, R., Bellebaum, J., Österblom, H., Vetemaa, M., Schirmeister, B., Stipniece, A., Dagys, M., van Eerden, M.& Garthe, S. 2009. Bycatch in gillnet fisheries – An overlooked threat to waterbird populations. Biological Conservation 142: 1269-1281. Žydelis, R. & Ruškyte, D. 2005. Winter foraging of Long-tailed Ducks (Clangula hyemalis) exploiting different benthic communities in the Baltic Sea. Wilson Journal of Ornithology 117: