michahellis or hybrid? again

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Tim Worfolk
Posts: 4
Joined: Sun Mar 23, 2014 10:27 pm

michahellis or hybrid? again

Post by Tim Worfolk » Fri Mar 28, 2014 8:42 am

Another two from last Summer - both with darker mantle than nearby argenteus, both with yellow(ish) legs, both with broken band on P5 on one wing only, but on opposite wings. My question is, does this P5 pattern rule out michahellis or not? Thanks.
Attachments
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1st bird - YL Gull? 26/4/2013 Topsham
DSC_0456-01a.jpg (271.99 KiB) Viewed 2526 times
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1st bird - YL Gull? 26/4/2013 Topsham
DSC_0474-01b.jpg (296.59 KiB) Viewed 2526 times
DSC_0188-01a.jpg
2nd bird - YL Gull? 24/6/2013 Topsham
DSC_0188-01a.jpg (282.2 KiB) Viewed 2526 times
DSC_0186-01a.jpg
2nd bird - YL Gull? 24/6/2013 Topsham
DSC_0186-01a.jpg (234.39 KiB) Viewed 2526 times
DSC_0179-01a.jpg
2nd bird - YL Gull? 24/6/2013 Topsham
DSC_0179-01a.jpg (231.32 KiB) Viewed 2526 times

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marsmuusse
Posts: 666
Joined: Sun Sep 27, 2009 12:43 pm

Re: michahellis or hybrid? again

Post by marsmuusse » Tue Apr 01, 2014 9:17 pm

Hi Tim,
Interesting bird this is. Yellow legs and a shade darker than argenteus sounds okay for michahellis, but the wingtip is odd. Of course there is individual variation between populations with eastern birds showing less black, but in your bird the distribution of black doesn't match western birds. Black on P5 has a thin pattern, but also see that deep tongue on innerweb of P8. Ideally you would like to have more than 50% black there with a diffuse gradient. Here it is a deep tongue with a clear-cut border. See e.g.: http://gull-research.org/ylg/ylg5cy/5cynov016.html

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