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The mortality as a result of the 1988 virus epizootic amongst harbour seals Phoca vitulina in the North and Baltic Seas is estimated at 60% in the entire Wadden Sea. In the years 1989-1994, a prosperous recovery of the population has been observed which is reflected in a high post-epizootic rate of increase. The average annual rate of increase for the entire area was 16%, highest in The Netherlands...
Harbour seals Phoca vitulina were routinely recorded during ship-based seabird counts in the eastern North Sea in winter. This area borders on the Wadden Sea, a major breeding ground of the species in Europe. Line transect theory was used to estimate total numbers of seals at sea. A total estimate of 2200 seals was obtained (c.v. 35%; 95% confidence interval = 855-3785). Stratification of the...
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