Glaucous Gull 'barrovianus'-type Gulls

Two types of Glaucous Gull are seen in Hokkaido etc.
A very big type and a very small type.
I think the larger ones are pallidissimus, and the smaller ones are barrovianus.
It is feel that 'barrovianus'-type GG is obviously different even if two sexual factions of normal-type GG are considered.

Normal-type Glaucous Gull with a 1st winter Slaty-backed Gull.

This photograph was taken by me in the Mukawa fishing port on the Pacific Ocean side of Hokkaido in November, 2004.
It looks very large. Note the relation of the size with Slaty-backed Gull.

'barrovianus'-type Glaucous Gull with a 4th winter Slaty-backed Gull.

This photograph was taken by me in the Mukawa river on the Pacific Ocean side of Hokkaido in January, 2005.
This type is very slimness and very cute!
It has the feature that bill is smaller than normal-type Glaucous Gulls, and primaries is longer.
Like a Iceland Gulls but the Iceland Gull is more small.

　
Normal-type Glaucous Gull.　　　　　　　　 　　　　　　　　　'barrovianus'-type Glaucous Gull.

Kumlien's Iceland Gull.

The relation of three kinds of sizes is Normal＞Barrovianus＞Kumlieni.

Adult Vega Gull, 2nd 'barrovianus'-type Gull, 1st Kumlien's Gull.

Those type gulls look like Iceland Gulls but most Iceland Gulls aremore small.
Length of neck,bill and body size are very different though it looks like to barrovianus and kumlieni like this.

Will these be really barrovianus ?
L.h.barrovianus ,which had been attached to the satellite transmitterin Alaska,
was found in Hokkaido in January 2005 and 2003.
As for gull in 2005, the photograph was taken from Wakkanai.
It is thought that the possibility of these gulls is barrovianus is from Alaska.

These　gulls are also introduced to this page by Japanese Gull-site.

Adult winter 'barrovianus'-type Glaucous Gulls.

With a Slaty-backed Gulls. December 27, 2003. Shiraoi fishing port.

This bird have injured leg.

With a 1w Glaucous Gull. January 12, 2004.Mukawa fishing port.

Note the bill size of 1w Glaucous Gull.

With a many Gulls. January 2, 2005. Mukawa river.

I think this bird is typical 'barrovianus'-type.
Note the wing size. More width than 'barrovianus'-type Gull.

With a Slaty-backed Gull. January 2, 2005. Mukawa river.

With a many Gulls. March 5, 2005. Abashiri swan park. A right center.

With a slaty-backed Gulls and Glaucous Gulls. Smaller than other Gulls.

March 5, 2005. Abashiri swan park.

3rd winter 'barrovianus'-type Glaucous Gulls.

February 22, 2003. Atuma fishing port.

With a Slaty-backed Gull and Glaucous Gull. January 24, 2004. Mukawa fishing port.

With a 1w Slaty-backed Gull. March 7, 2004. Tomakomai east port.

With a Slaty-backed Gull. March 22, 2004. Mukawa fishing port.

2nd winter 'barrovianus'-type Glaucous Gulls.

With a Slaty-backed Gull. April 16, 2004. Abashiri swan park.

With a Slaty-backed Gulls. December 14, 2004. Abashiri swan park.

Like a Kumlien's Iceland Gull. But Kumlien's Gull is more cute.

Juvenile-1st winter 'barrovianus'-type Glaucous Gulls.

February 19, 2003. Mukawa fishing port.

Photo by Yoshiaki Watanabe.

March 8, 2003. Mukawa river. Photo by Yoshiaki Watanabe.

January 12, 2004.Mukawa fishing port.

With a Slaty-backed Gull. March 6, 2004. Monbetu fishing port.

March 6, 2004. Monbetu fishing port.

With a Slaty-backed Gull. March 20, 2004. Tomakomai east port.

With a Slaty-backed Gull. April 13, 2004. Hashirikotan fishing port.

With a Slaty-backed Gull. April 13, 2004. Hashirikotan fishing port.

With a Slaty-backed Gull. April 13, 2004. Hashirikotan fishing port.

With a Slaty-backed Gull. April 13, 2004. Hashirikotan.

'barrovianus'-type Gulls. April 16, 2004. Abashiri swan park.

With a Slaty-backed Gull. December 19, 2004. Mukawa fishing port.

January 2, 2005. Mukawa fishing port.

With a Slaty-backed Gull. January 2, 2005. Mukawa.

With a Slaty-backed Gulls. March 5, 2005. Abashiri swan park.

With a normal-type Glaucous Gull.March 5, 2005. Abashiri swan park.

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Special thanks！ Osao Ujihara,Michiaki Ujihara,Yoshiaki Watanabe.

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