cr-gull green XLEN

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alfosse
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cr-gull green XLEN

Post by alfosse » Sat Dec 13, 2014 9:39 am

German gull green XLEN seen in Western France on 11.12.14.
Rather stocky, dark underside, shortish bill…
Mantle, scapulars, coverts seem to fit Caspian.
Pure Caspian or not?
Image
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Video:
http://youtu.be/E2giDjekVUU
Alain Fossé
Angers, France

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alfosse
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Re: cr-gull green XLEN

Post by alfosse » Sat Dec 13, 2014 9:16 pm

Not! :? Actually ringed on 3.6.14 at Gräbendorfer See (DE) as Larus michahellis
See life-history on http://baguage.lpo-anjou.org/XLEN
(Thanks to Ronald Klein, Roland-Jan Buijs and Jean-Michel Sauvage.)
Alain Fossé
Angers, France

lou bertalan
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Re: cr-gull green XLEN

Post by lou bertalan » Sun Dec 14, 2014 11:03 am

salut alain,

personally i don't think this is a (pure) michahellis. bill shape, small eye, plain coverts with diffuse pale fringes and esp. scap pattern with black markings in uppers concentrated around shaft with a thin subterminal bar: all smells at least to have some cachinnans blood. it would be nice to have more detailed info about the circumstances of ringing for this bird.

lou

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alfosse
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Re: cr-gull green XLEN

Post by alfosse » Sun Dec 14, 2014 12:48 pm

lou bertalan wrote:personally i don't think this is a (pure) michahellis
Yes I do agree. When I first saw the bird I couldn't make up my mind. On the pictures, I found some discrepancies: Caspian-like upperparts but head, bill, underparts not usual for that species…
When Ronald said it was ringed as a micha, I was a bit puzzled: a micha probably would have a whiter head…
Alain Fossé
Angers, France

Ronald Klein
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Re: cr-gull green XLEN

Post by Ronald Klein » Wed Dec 17, 2014 5:26 pm

A determination as chick mostly means nothing in these mixing colonies with hybridization. Best way is their identification later.

Emmanuel
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Re: cr-gull green XLEN

Post by Emmanuel » Wed Dec 17, 2014 6:28 pm

Ronald Klein wrote:A determination as chick mostly means nothing in these mixing colonies with hybridization. Best way is their identification later.
Hi friends,
Ronald, is Reddern nearly pure, because "founded by Caspians in the last 5 years", or strongly "mixed with hybridization"?

If mixing: + few michahellis, or even argentatus? (as in Sedlitz... and despite absence of HG in near S-POL?!)

Last, do you know why XLEN was said "michahellis" by ringer, while birds ringed in Reddern are usually said "Herring Gull (Group) (Larus argent./cachin./michah.)"?...

Good evening,
Emmanuel

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Re: cr-gull green XLEN

Post by Ronald Klein » Sat Dec 20, 2014 11:27 am

All colonies in Lausitz are +/- mixed.
Gräbendorfer See (Reddern) is dominated by Caspians with some HG, Sedlitz mixed HG + CG.
YLG is in minority, >10%.
Many gulls in the colonies are hybrids, because they interbreed since 20 years.
But the number of pure CG is increasing.

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alfosse
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Re: cr-gull green XLEN

Post by alfosse » Sat Jan 03, 2015 1:44 pm

Again seen on 23, 26 and 30 Dec, still some doubts about its identity. New pictures on http://www.digimages.info/goeleu/goeleu.htm#XLEN. Updated life-history on http://baguage.lpo-anjou.org/XLEN
Alain Fossé
Angers, France

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