IJmuiden Lesser Black-backed Gulls fitted with GPS-loggers – update December 2019

An update on some of the 19 Lesser Black-backed Gulls of our IJmuiden Forteiland project in the Netherlands that have been fitted with a GPS logger in 2019. With observations in Spain and movements to/in Morocco.

The information is based on data up to December 23, 2019.

For information about the project, see the end of this post.

Request: images of these locations or of course these gulls are very welcome!


Adult YASV/ 5369 is one of the 10 adults that were fitted with a GPS-logger this year. It showed up in its regular wintering location of Malaga harbour, Spain, as reported by Salvagaviotas on Twitter:

I reported on YASV back in July when it flew from the colony in IJmuiden to France and back.

First-calendar years

The main news since the movements reported on in November regarding the first-calendar years is that 2 more individuals have moved to Morocco. Also, YCZN was photographed in Madrid, Spain.

  • YCWT 5797 Morocco (new location, moved from Spain)
  • YCZP 5943 Morocco (new location, moved from Spain)
  • YCZN 5942 Spain (still in Madrid)
  • YCZT 5953 Morocco (still in the Rabat area)



YCZT/5953 is still in the Rabat area, while YCZP/5943 has moved from southern Spain to Morocco and is a little bit further south in Casablanca.

YCWT/5957 has also moved from southern Spain to Morocco and has reached Agadir. I know Agadir and the route along the coast that it took well because of my trips to Morocco in 2017 and in 2019. It’s very nice to know that YCWT has now arrived there.


YCWT in July while still in the colony in IJmuiden:



YCZN/5942 has been in Madrid, Spain, since November and was photographed there by Jesús Ramírez Villar who kindly agreed to let us use his photos. Thanks Jesús, it’s a valuable observation for us!


The location in Madrid where YCZN was photographed:


The movements of YCZN in Madrid:


About the project

(Source: http://www.uva-bits.nl/project/daily-movements-of-gulls-from-forteiland-ijmuiden/)

The tracking study is part of an ongoing collaboration between the University of Amsterdam UvA (Dr. Judy Shamoun-Baranes) and the Royal Netherlands Institute for Sea Research 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.


If you come across any of our gulls from the IJmuiden Forteiland project, please let us know.

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