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Monitoring harbour seal (Phoca vitulina) in the Danish Wadden Sea
Helgoländer Meeresuntersuchungen volume 43, pages 347–356 (1989)
Abstract
Monitoring of harbour seal (Phoca vitulina) has been carried out in the Danis part of the Wadden Sea during the past 8 years by the Fishery and Maritime Museum. In addition to this, field observations over three breeding seasons have been undertaken. The census shows a steady increase of approx. 14% per yeart. The distribution of the seals in the area can be split up into two different types of haulout localities, and a varied pattern of haulouts is observed during the year. The mass die-off in 1988 is discussed within the framework of the knowledge on the population, and it is recommended that more effort be put into monitoring and population studies of the harbour seal in the entire International Wadden Sea.
Literature Cited
Bøgebjerg, E., 1986. Spættel sæl (Phoca vitulina) i Danmark 1976–1984. — Dansk Vildtunders.42, 1–38.
Drescher, H. E., 1979. Biologie, Ökologie und Schutz der Seehunde im schleswig-holsteinischen Wattenmeer. — Beitr. Wildbiol.1979 (1), 1–74.
Reijnders, P. J. H., 1976. The harbour seal (Phoca vitulina) population in the Dutch Wadden Sea: Size and composition. — Neth. J. Sea Res.10, 223–235.
Søndergaard, N.-O., Joensen, A. H. & Bøgebjerg Hansen, E., 1976. Sælernes forekornst og sæljagten i Danmark. — Dansk Vildtunders.26, 1–80.
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Tougaard, S. Monitoring harbour seal (Phoca vitulina) in the Danish Wadden Sea. Helgolander Meeresunters 43, 347–356 (1989). https://doi.org/10.1007/BF02365895
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DOI: https://doi.org/10.1007/BF02365895