Thursday, October 20, 2016

Another Goldcrest Day

The last ringing session at Oakenclough 8th October 2016 gave us 63 Goldcrests out of a total of 121 birds caught. I met Andy at 0715 this morning and while we were far from sure quite what to expect, we didn’t imagine Goldcrests would dominate the field sheet again. 

The ringing was steady if unspectacular whereby at midday when we left the total of birds caught stood at 53 with Goldcrests providing more than 50% again. 

Totals today: 27 Goldcrest, 10 Greenfinch, 4 Lesser Redpoll, 2 Chaffinch, 2 Blackbird, 2 Treecreeper, 1 Goldfinch, 1 Redwing, 1 Song Thrush, 1 Blue Tit, 1 Coal Tit, 1 Dunnock. 

Lesser Redpoll
 
Treereeper

There was quite a movement of Greenfinch this morning with small groups of 10-15 birds arriving and approximately 60+ throughput the morning. At one point a flock of 20+ left to the north with a flock of Fieldfares. We caught zero Fieldfares today out of approximately 100+ which arrived unseen from the south and fed on berries for a short while before leaving to the north. Redwings were in short supply with less than twenty seen throughout our stay and just the one caught. 

Greenfinch

Redwing

One of the two Blackbirds was of the “continental” type with a very dark bill and scalloped breast feathers.

"Continental" Blackbird

Goldcrest

The Goldcrest has a large range, estimated at 13.2 million square kms with a total population of 80–200 million individuals. (Wiki) There has been some northward range expansion in Scotland, Belgium, Norway, Finland and even Iceland during the 20th century, assisted by the spread of conifer plantations. A female lays 10-12 eggs and second broods are common. After a successful summer the population can increase many times over and a huge number of those birds looking to migrate south to escape the winters of much of their breeding range. The population is currently thought to be stable although there may be temporary marked declines in harsh winters of normally temperate Western Europe where the Goldcrest winters. 

As in our previous Goldcrest catch of 8th October we noticed today that most had good weights of slightly above the expected norm of 5 to 5.5gms with many approaching 6gms. Looking more closely today a number of our birds also showed a larger amount of grey around the head than a typical UK bird. These greyish headed Goldcrests are thought to be possibly from one or two of the eastern forms of the Goldcrest (see below). Alternatively, given such a widespread, numerous and highly migratory species there are likely to be intergrades of types. 

In continental Eurasia there are nine generally accepted and very similar subspecies of Goldcrest Regulus regulus which differ only in details such as plumage shade: 
  • R. r. regulus. Breeds in most of Europe; this is the nominate subspecies and the one resident in the UK. 
  • R. r. japonensis. Breeds in Eastern Asia, including Japan, Korea, China and Siberia; it is greener and has darker upper-parts than the nominate form, and has broad white wingbars. 
  • R. r. coatsi. Breeds in Russia and Central Asia, and is paler above than the nominate subspecies. 
  • R. r. tristis . Breeds in China and Central Asia, wintering in northeastern Afghanistan. It is distinctive, with the black edges to the crest largely absent. The crown of the male is yellower than in other forms, and the underparts are much duller and greyer. 
  • R. r. himalayensis. Breeds in the Himalayas; it is similar to the nominate subspecies, but slightly paler above and with whiter underparts. 
  • R. r. yunnanensis . Breeds in the Eastern Himalayas, Burma and China; it is like R. r. sikkimensis, but darker overall with dark green upper-parts and darker buff underparts. 
  • R. r. hyrcanus. Breeds only in Iran; it is like R. r. buturlini, but slightly darker. 
  • R. r. buturlini. Breeds in Eastern Europe, the Caucasus and Central Asia. It is paler above than the nominate subspecies, and greyish-green rather than olive. 
  • R. r. sikkimensis. Breeds in India and China. It is darker than R. r. himalayensis, and greener than the nominate subspecies. 
It all makes for much thought and closer investigation of birds in the hand when time and available hands allow.  The priority always is to ring, process and release a bird as quickly as possible, especially where small and vulnerable birds like Goldcrests are concerned.

Other birds seen/heard this morning: 2+ Brambling, 3 Grey Wagtail, 2 Pied Wagtail, 1 Sparrowhawk, 1 + Bullfinch. 

Linking today to Eileen's Saturday.

11 comments:

David Gascoigne said...

Great post, Phil. As always we are entertained and tutored by your dissertations.

Jenn Jilks said...

How busy have you been/!!!!!!
good work!
(ツ) from Cottage Country Ontario , ON, Canada!

Lowcarb team member said...

... and there was me thinking a blackbird is a blackbird, I never knew there was a continental blackbird.

It seems to me that you saw a good selection of birds.

All the best Jan

Prunella Pepperpot said...

I too didn't know we had contineental type blackbirds.
You have indeed been very busy but I bet you have loved every minute of it. Beautiful birds!
Have a wonderful weekend :)

Margaret Adamson said...

WOW! SO many birds to rinf=g and such a variety. Marvellous to ring so many Godcrests

jandi said...

The closeup image of the blackbird is beautiful.

eileeninmd said...

Hello Phil, beautiful collection of birds. It is great you saw so many during the ringing. The Goldcrest is pretty.

Thank you for linking up and sharing your post. Happy Saturday, have a happy weekend!

Judy Biggerstaff said...

Nice collection of birds and an interesting post. Thanks for sharing.

sandyland said...

let's all go to the Himalayas!!

Rajesh said...

Beautiful goldcrest bird.

Mary Cromer said...

The header Raptor is a stunning image Phil. The star for me in this post is the Blackbird. You did a great job in capturing the fine detail. Often times, I don't get the fineness of dark feathers on birds.

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