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?
Video:
http://youtu.be/E2giDjekVUU
cr-gull green XLEN
- alfosse
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Alain Fossé
Angers, France
Angers, France
- alfosse
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Re: cr-gull green XLEN
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.)
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
Angers, France
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Re: cr-gull green XLEN
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
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
- alfosse
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Re: cr-gull green XLEN
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…lou bertalan wrote:personally i don't think this is a (pure) michahellis
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
Angers, France
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Re: cr-gull green XLEN
A determination as chick mostly means nothing in these mixing colonies with hybridization. Best way is their identification later.
Re: cr-gull green XLEN
Hi friends,Ronald Klein wrote:A determination as chick mostly means nothing in these mixing colonies with hybridization. Best way is their identification later.
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
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.
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.
- alfosse
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Re: cr-gull green XLEN
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
Angers, France