Daily movements of gulls from Forteiland IJmuiden

Species: Lesser Black-backed Gull

In 2019 we began tracking 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 with active trackers in 2021

Color ring, Logger number


5469 YDAS
5557 YDAU
5576 YDAV
5579 YCVN
5654 SAAC
5861 YBKW
5963 YAVL
5964 YDAZ
5965 YAVH
5971 YDBB
5977 YDBD
5979 YDBH
5983 YDBJ
5609 YCNR
5615 YCKU
5630 YDHK
5646 YDHM
5665 YDHN
5666 YDHP
5715 YDHL
5717 YDHS
5722 YDHT
5931 YDHR
Loading devices
For optimal performance, please select no more than 10 devices.
Near real-time tracking data (last 3 days of data available per individual bird)
Loading devices...

Contact Persons:

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

Dr. Kees Camphuysen (NIOZ)


Our sponsors: