The Frequency of Birds over the High Atlantic Ocean

Abstract

THE Danish Commission for the Study of the Sea has, during the years 1913 and 1920-1922, under the direction of Dr. Johs. Schmidt, made a series of marine-biological investigations in the northern part oof the Atlantic Ocean and in West Indian waters. The following four expeditions have been carried out: in 1913 with the schooner Margrethe, in 1920 and 1921 with the motor-schooner Dana, and in 1921-1922 with the research steamer Dana. So far as circumstances permitted, ornithological observations were also made on these expeditions, and it is oh the odiary of these observations, in combination with notes made on various voyages to the United States of America and to the West Indies, that the present account is based. In this I shall endeavour to give, on general lines, an idea of the frequency of birds over the various parts of the Atlantic.