Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1985, Page 17

Náttúrufræðingurinn - 1985, Page 17
11. mynd. Fæöa bleikju í Mývatni seint í júlí 1977. Geirarnir sýna hlutföll (%) bleikju- maga sem höfðu tiltekna átutegund sem aðalfæðu (meira en helming magainnihalds). Átutegundirnar eru: (1) skötuormur, (2) rykmý (lirfur og púpur), (3) kornáta, (4) vatnabobbar (Lymnaea peregra), (5) hornsíli (Gasterosteus aculeatus), (6) langhalafló (.Daphnia longispina). Byggt á Arnþóri Garðarssyni og Árna Einarssyni (1977). - Food of arctic char (Salvelinus alpinus) in various parts of Lake Mývatn (late July 1977). The areal variation in food composition probably reflects a parallell variation infood availabil- ity. Thepie diagrams showpercentages ofstomachs having a givenfood type as mainfood. (1) Lepidurus arcticus, (2) Chironomidae (larvae and pupae), (3) Eurycercus lamellatus, (4) Lymnaea peregra, (5) Gasterosteus aculeatus, (6) Daphnia longispina. Based on Arnþór Garðarsson and Árni Einarsson (1978). 167

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