Daily movements of gulls from Forteiland IJmuiden

Species: Lesser Black-backed Gull

In 2019 we will begin the first tracking study of lesser black backed gulls on Forteiland IJmuiden. Approximately 1100 pairs lesser black backed gulls and 70 pairs of herring gulls breed on the island. The breeding colony has been monitored since 2008 by a team of volunteers. The current team members are  Fred Cottaar, Jose Verbeek and Maarten van Kleinwee. In collaboration with PBN, part of the island is blocked off from pedestrians during the breeding season to let gulls breed undisturbed on this unique location in the busy harbour of IJmuiden.

Forteiland IJmuiden

The tracking study is part of an ongoing collaboration between UvA (Dr. Judy Shamoun-Baranes) and the NIOZ (Dr. Kees Camphuysen). The study is being conducted within the project “Interactions between birds and offshore wind farms: drivers, consequences and tools for mitigation” funded by NWO Applied and Engineering Sciences Open Technology Programme, Rijkswaterstaat and Gemini windpark. The tracking study will provide complementary information on the movement patterns of gulls breeding along the North Sea coast, with similar objectives to the studies conducted on Texel and Schiermonnikoog.  The main aim is to identify intrinsic and external drivers of movement from fine scale flight behaviour to seasonal migrations. While adult gulls from other colonies have been tracked since 2008, little is still known about the daily movements and flight behaviour of juveniles and how this differs from adults. This study will contribute to our knowledge on how juvenile birds develop their foraging and migration strategies and how their flight behaviour differs from adults.

Forteiland, IJmuiden

Within the scope of the project we are especially interested in fine scale flight behaviour at sea. Forteiland is particularly interesting in this respect as it is relatively close to several wind parks in the North Sea. Enabled by the design of the tracking system, the UvA-BiTS system will automatically switch to high resolution measurements over the North Sea, measuring speed, altitude, location and tri-axial acceleration to identify behaviour, every 3 seconds.

If you are following birds on the website or in the field, here are the codes for birds tracked in 2019

Color ring, Logger number


YASV 5369
YCVL 5433
YCVM 5441
YBJC 5491
YAUT 5565
YCVN 5579
YBBJ 5584
YBKW 5861
YBHM 5962
 YAVL 5963

 First-years (2019)

YCWT 5797 chick of YBJC
YCZN 5942
YCZP 5943
YCZR 5944
YCWF 5946 chick of YBKW
YCZS 5950
YCWU 5951 chick of YBJC
YCXJ 5952
YCZT 5953
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Near real-time tracking data (last 3 days of data available per individual bird)
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Contact Persons:

Dr. Judy Shamoun-Baranes (UvA) shamoun@uva.nl

Dr. Kees Camphuysen (NIOZ)


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