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

An update on the 9 first-calendar year Lesser Black-backed Gulls of our IJmuiden Forteiland project that have been fitted with a GPS logger. The information is based on data up to September 30, 2019.

Click the images for a larger view.


The following list shows the ring code, logger code, and latest location:

  • YCWF 5946 France
  • YCWT 5797 Spain
  • YCWU 5951 Spain
  • YCXJ 5952 United Kingdom
  • YCZN 5942 United Kingdom
  • YCZP 5943 France
  • YCZR 5944 The Netherlands
  • YCZS 5950 Died in the Netherlands. See details below.
  • YCZT 5953 France

It is obvious from the list that the locations are very spread out: while some are still in the Netherlands, others are already far away in southern Europe.

United Kingdom

YCZN/5942 and YCXJ/5952 have both crossed the North Sea and are spending their time west of London, near Newbury. It is common for our Dutch Lesser Black-backed Gulls to travel to the UK, either to spend the winter there or as a stop-over for their journey to southern Europe. Time will tell what these 2 individuals will do.


YCWF/5946, YCZP/5943, and YCZT/5953 are all in Northern France.

YCWF is around Boulogne-sur-Mer along the coast, YCZP is spending a lot of time around Cabrai in the east, while YCZT is in Douai, the same location that adult Lesser Black-backed Gull YASV visited in July.


YCWT/5797 and YCWU/5951 are both in Spain. YCWT travelled via the Portuguese coast and has passed the border of Portugal and Spain towards Matalascañas. YCWU crossed central France and is now at Deltebre on the east coast, south-west of Barcelona.

The Netherlands

Meanwhile, YCZR/5944 and YCZS/5950 are both in the Netherlands.

YCZR is still very much a local bird and is spending its time in and around Amsterdam.

Sadly, YCZS/5950 was found dead on a roof at an industrial site at Alphen aan de Rijn, the Netherlands. It died some time around 18 September. Fortunately the logger could be recovered. The tracks from August and September show that it mainly visited the Amsterdam area before ending up at Alphen aan de Rijn.

YCZS in the colony in July 2019:

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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