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

The adult and juvenile Lesser Black-backed Gulls that were fitted with GPS loggers recently are all doing well.


The adult that recently made a trip to France has not been seen since July 10 and is believed to be on its way to Malaga, Spain via France to spend the winter there.

The other 9 adults are still present in the colony doing their daily routines.

One change could be seen though in their daily tracks: during the week of 22 – 26 July temperatures in IJmuiden rose to the mid-30 degrees Centigrade and almost all adults could be seen making trips only to the North Sea with only a few adults also going to urban areas.


The juveniles are still very much tied to their home on IJmuiden Forteiland where they are being fed by their parents, but they are starting to explore their surroundings more and more.

It will not be long before they will leave the colony and head off to their wintering grounds in Spain, Portugal, or Morocco.

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.

2 thoughts on “IJmuiden Lesser Black-backed Gulls fitted with GPS-loggers – update July 2019

  1. The first picture perfectly fits the following observations that could be made in Amsterdam. During the extremely high temperatures in the week of 22 – 26 July the number of lesser black-backed gulls in the West part of Amsterdam diminished rapidly. In many cases the adults staying in town apparently had to remain there because they needed to take care of their
    chickens which had been raised on rooftops; the others seemed to leave the city. In waters like Nieuwe Meer and Sloterplas chickens could be seen in groups of 20-25, being busy with flying exercises. In the same week adults and well grown chickens could be seen and heard high in the sky flying to the coast in a straight line. At the end of this week on many locations herring gulls formed the majority of the large gulls being present, while until recently on the same spots lesser black-backed gulls clearly outnumbered the herring gulls.

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