Náttúrufræðingurinn

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Náttúrufræðingurinn - 1968, Side 125

Náttúrufræðingurinn - 1968, Side 125
NÁTTÚRUFRÆIÐINGURINN 233 HEIMILDARIT Broch, H. 1924. Cirripedia Thoracica von Norwegen nnd dem Norwegischen Nordmeere. Skr. VidenskSelsk.Christ., Mat.-naturv. Kl., 77:1—121. Einarsson, O. (1598). Qualiscunque descriptio Islandiae. Hamburg 1928. Gröndal, B. 1874. Um náttúru íslands. Gefn, 5:1—57. I-loek, P. P. C. 1909. Die Cirripedien des nordischen Planktons. Norcl. Plankt., Zool. Teil, 4:265-332. Ingolfsson, A. 1967. The feeding ecology of five species of large gulls (Larus) in Iceland. Pli. D. thesis, University of Michigan. Kriiger, P. 1927. Cirripedia. Tierwelt N.-u. Ostsee, X.d. Oddsson, G. (1638). íslenzk annálabrot og undur íslands. Akureyri 1942. Pálsson, S. (1797). Ferðabók Sveins Pálssonar. Reykjavík 1945. Pilsbry, IL. A. 1907. Tlie barnacles (Cirripedia) contained in the collections of the U. S. National Museum. Bull. U. S. nat. Mus., 60. Stephensen, K. 1933. Rankefödder eller Cirripedier. Danra. Fauna. — 1938. Cirripedia (incl. Rhizocephala). Zoology of Iceland III, part 30—31. Thorarinsson, S. 1966. Surtsey. The new island in the North Atlantic. Reykjavík. Thörner, E., und Ankel, W. E. 1966. Die Entenmuschel Lepas fascicularis in der Nordsee. Natur u. Mus., 96:209—220. SUMMARY (íoosc llarnacles (Lepas spp.) on Surtscy Pumice by Finnur Gudrnundsson and Agnar Ingolfsson During the years 1964—1966 one of us (A. I.) was engaged in a comparative study of the l'ood and feeding habits of Icelandic gulls. In the course of this study it was found quite unexpectedly that goose barnacles (Lepas spp.) were an important food item in gulls collected in October/Novembcr 1965, at Sancl- vik on tlie Rcykjancs Penisula in S. W. Iceland. This was unexpected because at high latitudes goose barnacles rarely occur in sufficient abundance to become a likely food source for sea-birds. Table 1 gives a detailed picture of the incidence of goose barnacles in various gulls collected in the Sandvik area during the last three montlis of 1965. The table sliows tliat the percentage of gulls (all species lumped together) wliich had fed on goose barnacles increased until October 18, when it reached the maximum of 70%, but after that the percentage quickly decreased. Although goose barnacles were among the chief foods taken by the gulls in the Sandvik area during the above period, they by no means confined themsclves to this food item as they some- times do when some foods (e. g. capelin (Mallotus villosus) or sandeel (Ammo- dytes lancea)) are present on a very large scale. In only 40% of the gulls that
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