Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1976, Page 62

Náttúrufræðingurinn - 1976, Page 62
164 NÁTTÚRUFRÆÐIN GURINN TAFLAG Samanburður A fœðuvali bleikju 30 cm í júlí og ágúst 1969 og 1972 og 1973 (Syðri-flói) Hlutfallsleg skipting fœðutegwida í bleikjum ögum (%) 1972 1973 1969 1972 1973 1969 Fæðutegund 20.-28/6 10.-21/7 r 3/7 21 .-22/7 2/8 4/8 Hornsíli (Gasterosteus) . 67 50 19 4 80 Vatnabobbar (Lymnaea) 26 1 54 9 7 13 Ghirenomidae-lirfur 7 3 6 + 29 + — púpur og lirfur .... 6 23 20 14 20 7 Botnkrabbar + 23 + 77 37 Eurycerc.us + 3 + Lepidurus 23 + 77 32 Svifkrabbar + + Daphnia Cyclops + Grænþörungar (Chlorophyta) + Fjöldi maga 14 13 22 8 9 15 TAFLA7 Samanburður á fœðuvali hornsíla í júli og dgúst 1969, 1972 og 1973 Hlutfall fceðutegunda i % af innihaldi maganna Fæðutegundir 1972 22. júlí 1973 21. júlí 1969 4. ágúst 1973 16. ágúst Chirenomidae-lirfur 62 66 36 5 — púpur og flugur 1 1 Botnkrabbar 10 6 34 91 Eurycerus 5 19 64 I.epidurus 6 Alona affitiis 6 27 Svifkrabbar Daphnia 27 Cyclops 28 4 Meðallengd (mm) 77 82 30 80 F'jöldi maga 19 16 32 16
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