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Diving depths of Shags Phalacrocorax aristotelis breeding on the Isle of May

1991; Wiley; Volume: 133; Issue: 1 Linguagem: Inglês

10.1111/j.1474-919x.1991.tb04807.x

1474-919X

Sarah Wanless, Alan E. Burger, M. P. Harris,

Marine Bivalve and Aquaculture Studies

Information on maximum dive depth and the time spent at various depths was obtained from 49 Shags Phalacrocorax aristotelis. On average, the maximum dive depth was 33–35 m; the overall maximum was 43 m. Shags dived repeatedly to the same depth and spent c. 55% of the time between 25 and 34 m which indicated that they were foraging close to the seabed. About 46% of the time underwater was spent foraging and 54% travelling. Average underwater swimming speed was 1.7‐1.9 m per second.