Attributes / relations provided by
♦ ¹Hansson, S., Karlsson, L., Ikonen, E., Christensen, O., Mitans, A., Uzars, D., Petersson, E. and Ragnarsson, B. (2001), "Stomach analyses of Baltic salmon from 1959–1962 and 1994–1997: possible relations between diet and yolk-sac-fry mortality (M74)". Journal of Fish Biology, 58: 1730–1745
♦ ²Food web topology and parasites in the pelagic zone of a subarctic lake, Per-Arne Amundsen, Kevin D. Lafferty, Rune Knudsen, Raul Primicerio, Anders Klemetsen and Armand M. Kuris, Journal of Animal Ecology 2009, 78, 563–572
♦ ³del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.