A decline in oil rates consolidated : monitoring and assessment of the proportion of oiled Common Guillemots in The Netherlands winter 2018/19
Camphuysen, C.J. (2019). A decline in oil rates consolidated : monitoring and assessment of the proportion of oiled Common Guillemots in The Netherlands winter 2018/19. NIOZ Royal Netherlands Institute for Sea Research: Texel. 22 pp.
This is the annual update for OSPAR of the beached bird survey (BBS) results in The Netherlands winter 2018/19. 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 60 year study period, but most notably in recent decades (~2005 to present). In recent seasons, consistently low oil rates are found in all species, and this includes the target species Common Guillemot Uria aalge, even though some hic-ups occurred in some species mostly as a result of small sample size.
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