IJmuiden 17-05-10 -- visit to Forteiland colony

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Ruud Altenburg
Posts: 248
Joined: Sun Sep 27, 2009 1:58 pm

IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:01 pm

I was invited by Fred Cottaar and Kees and José Verbeek to join them to the Forteiland in IJmuiden, which houses a colony of Lesser Black-backed Gulls (about 1000 pairs) and Herring Gulls (about 100 pairs). After counting nests and eggs, Fred and Kees ringed 16 adults on the nest using walk-in cages and José and I read rings. Below is an impression of the colony and its inhabitants.

Ruud Altenburg
Posts: 248
Joined: Sun Sep 27, 2009 1:58 pm

Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:21 pm

An overview of the colony.
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Ruud Altenburg
Posts: 248
Joined: Sun Sep 27, 2009 1:58 pm

Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:26 pm

Most nests contained three eggs (the norm), a few even four. Hatching had just started, only two nests contained chicks.
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Ruud Altenburg
Posts: 248
Joined: Sun Sep 27, 2009 1:58 pm

Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:35 pm

Plenty of locally ringed birds of course, including those ringed years ago with metal only. Also quite a few birds from the Europoort colonies.
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Ruud Altenburg
Posts: 248
Joined: Sun Sep 27, 2009 1:58 pm

Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:39 pm

YAHH is a breeding Yellow-legged Gull, although I suspect, based on mantle colour that it has some LBBG ancestry.
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Ruud Altenburg
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Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:50 pm

It was a treat to encounter some of the Amsterdam residents in the colony! YABN, YAAM and YACB.
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Ruud Altenburg
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Joined: Sun Sep 27, 2009 1:58 pm

Re: IJmuiden 17-05-10 -- visit to Forteiland colony

Post by Ruud Altenburg » Tue May 18, 2010 1:53 pm

Finally some non-local ringed birds in the periphery of the colony. The Caspian Gull was ringed in... Belgium! :?
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