Search found 9 matches

by Klaas van Dijk
Thu Aug 02, 2012 11:11 am
Forum: Caspian Gull
Topic: 1st cycle Larus cachinnans
Replies: 13
Views: 16068

Re: 1st cycle Larus cachinnans

This gull bears a metal ring of the Polish Ringing Centre (Gdansk Poland). It might even be possible to identify the last two numbers (upper row) of the ring number?

I have no idea about the species. Larus Poliscka?
by Klaas van Dijk
Fri Mar 23, 2012 8:27 am
Forum: News
Topic: longevity records for gulls
Replies: 4
Views: 4814

Re: longevity records for gulls

The longevity record for Black-headed Gull is currently held by Arnhem 3.275.396 * ringed as chick on 25 June 1978. * last observation (metal ring read) on 21 March 2011 (Zoetermeer, ring read by Benny Middendorp). * elapsed time 32 years, 8 months and 24 days. See a recently published paper in Dutc...
by Klaas van Dijk
Sat Mar 17, 2012 8:03 am
Forum: Black-headed Gull
Topic: Strange ring on Blackheaded Gull
Replies: 6
Views: 5328

Re: Strange ring on Blackheaded Gull

hi Lou, It seems likely to me that this Black-headed Gull has been colour-ringed in the eastern part of Germany (the former East-Germany), as all species of gulls colour-ringed in this part of Germany have colour-rings that start with an 'X'. You might contact: (1): Hendrik Trapp h-trapp@web.de Ring...
by Klaas van Dijk
Mon Dec 20, 2010 8:45 pm
Forum: Common Gull
Topic: Larus canus
Replies: 36
Views: 23662

Re: Larus canus

In terms of heinei , I have read that this type of pattern could indicate that form but cannot find any definitive heinei pics with anything other than a white rump and uppertail in 1st winter. But heinei pics seem very difficult to source. Are there any galleries on the web? I have seen the Kazakh...
by Klaas van Dijk
Mon Dec 06, 2010 9:26 pm
Forum: Black-headed Gull
Topic: Black-headed Gulls with gray hind neck
Replies: 3
Views: 4158

Re: Black-headed Gulls with gray hind neck

It is not uncommon for an adult Black-headed Gull in non-breeding plumage to have two of these bands. See e.g. http://frankmajoor.nl/PDF/Kokmeeuwen-Gooi-Vogeljaar-95.pdf for more information on the individual variation in the non-breeding plumage of adult Black-headed Gulls (page 152 and 153, in Dut...
by Klaas van Dijk
Fri Dec 03, 2010 11:41 am
Forum: Caspian Gull
Topic: Yellow PDHN & PDUS = Larus cachinnans kolonia
Replies: 3
Views: 3163

Re: Yellow PDHN & PDUS = Larus cachinnans kolonia

hi Michal, Thanks for your explanation and please excuse me for the delay of my reply. I think it is a good descision of the Polish Ringing Centre to use this kind of names for gulls breeding in a mixed gull colony where Herring Gull and Caspian Gull both are breeding, and where a variety of hybrids...
by Klaas van Dijk
Fri Oct 22, 2010 10:39 am
Forum: Caspian Gull
Topic: Yellow PDHN & PDUS = Larus cachinnans kolonia
Replies: 3
Views: 3163

Yellow PDHN & PDUS = Larus cachinnans kolonia

Recently, 2 colour-ringed gulls from a mixed colony in SW Poland were observed in the northern parts of The Netherlands. Both observations were ring readings of healthy birds. The official ring recovery report from the Polish Ringing Centre ('Ornitological Station Museum and Institute of Zoology PAS...
by Klaas van Dijk
Fri Oct 22, 2010 10:13 am
Forum: Articles
Topic: LBBG in the Congo basin (Ornis Fennica 2010)
Replies: 0
Views: 1891

LBBG in the Congo basin (Ornis Fennica 2010)

See http://www.ornisfennica.org/pdf/vol87-3/4Kylin.pdf Abstract: "After observing several nominate Lesser Black-backed Gulls ( Larus fuscus fuscus ) on Lake Tumba, Democratic Republic of the Congo, literature and museum studies were reviewed to compile observations of the species in the Congo basin....
by Klaas van Dijk
Thu Dec 17, 2009 9:12 am
Forum: Other taxa & hybrids
Topic: heuglini & taymirensis
Replies: 3
Views: 1399

Re: heuglini & taymirensis

Some photo's of taimyrensis (defined as breeding birds on the Taimyr peninsula) can be found on http://www.radioactiverobins.com/gulls/taimyrgull/taimyrgull.htm The paper has been submitted to Dutch Birding in March 2009, and currently the draft is edited by the editors. A nice paper on the occurenc...