Attributes / relations provided by
♦ ¹Dietary importance of various prey fishes for pikeperch Sander lucioperca (L.) in large shallow lake Võrtsjärv (Estonia), Peeter Kangur, Andu Kangur, and Külli Kangur, Proc. Estonian Acad. Sci. Biol. Ecol., 2007, 56, 2, 154-167
♦ ²Foraging rhythm of great crested grebes Podiceps cristatus adjusted to diel variations in the vertical distribution of their prey Osmerus eperlanus in a shallow eutrophic lake in The Netherlands, T. Piersma, R. Lindeboom, and M.R. van Eerden, Oecologia (1988) 76:481-486