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Monitoring and assessment of the proportion of oiled Common Guillemots from beached bird surveys in The Netherlands: update winter 2012/13
Camphuysen, C.J. (2013) NIOZ Internal Report, June 2013. Royal Netherlands Institute for Sea Research, Texel
Summary
This is the annual update for OSPAR of the beached bird survey (BBS) results in The Netherlands (winter 2012/13). The Dutch BBS provides data for OSPAR area’s 8, 9 and 10, but data from Belgian and German colleagues will have to be merged to arrive at the final values for these areas. For the Dutch North Sea region, significant declines in oil rates were reported over a long study period (1977/78-2012/13) as well as over the last 15 years. Declines were found in offshore seabirds (Common Guillemots (1998-2013; P< 0.05), Razorbills (P< 0.01) and Black-legged Kittiwakes, P< 0.01) as well as in most nearshore species (Common Eider, 1998-2013 P<0.05, Herring Gull, P<0.01). For coastal Common Scoters, the declining trend was just not significant, partly as a result of small sample size in recent years (1998-2013 P>0.05). The arithmetic 5-year running mean for Common Guillemots found along the Dutch North Sea shoreline has currently arrived at c. 30-35%. Data tables are provided to calculate running means for OSPAR areas 8, 9, and 10 (after a data merge with additional Belgian and German datasets). In winter 2012/13, densities of birds washing ashore were rather low and with low densities of stranded birds. In future years, a somewhat higher observer effort is required in order to guarantee a sufficiently large sample of birds to be checked for the presence or absence of oil.


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