Náttúrufræðingurinn - 01.06.1968, Blaðsíða 121

NÁTTÚRUFRÆÐINGURINN 233
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SUMMARY
Goose Iiarnacles (Lepas spp.) on Surtsey Pumice
by Einnur Gudmundsson and Agnar Ingolfsson
During the years 1964—1966 one of us (A. I.) was engaged in a comparativc
study of the food and íeeding 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/November 1965, at Sand-
vik on the Reykjanes 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 I gives a detailed picture of the
incidence of goose barnacles in various gulls collected in the Sandvik area
during the last three months of 1965. The table shows that the percentage
of gulls (all species lumped together) which 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 themselves to this food item as they some-
times do when some foods (e. g. capelin (Mallolus villosus) or sandeel (Ammo-
dyles lancea)) are present on a very large scale. In only 40% of the gulls that