查看完整版本: Narcissus Flycatcher-Owstoni 琉球姬鶲

mbill 17/04/2011 00:50

Narcissus Flycatcher-Owstoni 琉球姬鶲

Small Kinmen 小金門
24-3-2011
The bird was seen more than 15 minutes. It seems some yellow feather on its rump, different from the Hong Kong one? Is it the same Owstoni species?
[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1372.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1404.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1435.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1486.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1507.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC1523.jpg[/img]
Shek Kong-Hong Kong 香港,石崗
13-4-2011
[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC6112.jpg[/img]

[img]http://images5.fotop.net/albums5/billman/2nd_Quarter_2011/DSC6117.jpg[/img]

thinfor 17/04/2011 08:56

Just my guess.  The one you saw in Kinmen may be a male Green-backed Flycatcher (綠背姬鶲) that should be split into another subspecies.

Any other experienced birders please comment and thank you for sharing your great photos. 3551smile445

ltsunpun 21/04/2011 20:01

With reference to the Birds of Hong Kong & South China,. The bird in MBill’s photo is not Green Backed Flycatcher, it has a long supercilium, whereas supercilium of Green Backed Flycatcher is very short, do not extend to the back of the eye.

I also visited BirdsKorea.Organization the following website, a study report talking about the identification of Narcissus Flycatcher :

[url]http://www.birdskorea.org/Birds/Identification/ID_Notes/BK-ID-Narcissus-Flycatchers-types.shtml[/url]

I am not an expert, I am not able to 100% fully understand the content of the report. However, the study report said the Narcissus Flycatcher is presently considered to contain three distinctive subspecies – nominate narcissina Black backed, owstoni Olive-backed and elisae Green-backed,

Appendix of the Study Report provided tables with Summary of Identification Feature, the bird photo by MBill is a full adult male, so Full Adult Males (Table 2) of the Appendix is selected for identification purpose, finally I would suggest the bird is an owstoni Olive-backed for the following reasons:

-        No prominent eye-ring (elisae has prominent, yellow eye-ring)
-        Mantle and crown vary from moss or olive-green to blackish green (narcissina’s mantle and crown is black in color.)
-        Distinct yellow supercilium (narcissina’s supercilium is also distinct but orange-yellow; elisae usually has indistinct supercilium)
-        Yellow throat (narcissina’s throat is fiery orange)

Please correct if I am wrong.

参考香港及華南鳥類,這鳥不是綠背姬鶲,因為牠眉紋很長,綠背姬鶲是眼先短紋。

偶然在以下網頁看到韓國鳥會有關怎樣辨認黃眉姬鶲的一篇文章:
[url]http://www.birdskorea.org/Birds/Identification/ID_Notes/BK-ID-Narcissus-Flycatchers-types.shtml[/url]
我不是專家,未能看憧全篇文章。無論如何,文章指出黃眉姬鶲包括三個有特色的亞種 - nominate narcissina 黑背,owstoni 硫球和elisae 綠背。
文章最後有附錄例出不同的摘要以附表形式來辨認不同的亞種,由於MBill所拍到的是成年雄鳥,所以我參考附錄裹的成年雄鳥(附表2)來辨別這隻鳥,最後我提議牠是owstoni硫球亞種,原因如下:
-        沒有明顯的眼圈 (elisae 綠背有明顯的黃眼圈)
-        背部和冠顏色多變,由笞蘚色或橄欖色至墨綠色都有 (nominate narcissina 黑背的背部和冠的顏色是黑色的)
-        清楚的黃眉紋 (nominate narcissina 黑背的眉紋是很清楚的橙黃色,但elisae 綠背的眼紋通常是不明顯,或祇有眼先短紋)
-        咽喉黃色 (nominate narcissina 黑背的繁殖羽有火紅色的咽喉)

如有錯漏,請指正。
tpluk

ajohn 22/04/2011 13:42

I agree with your assessment tpluk, and I agree that this bird is an adult male owstoni.
Note that, elisae is treated as a different species in Hong Kong (unlike Birds Korea) and that owstoni may also be split in future.

ltsunpun 22/04/2011 19:49

John, thank you. I have used a lot of time to read through the long report (about 30 pages), perhaps this is my reward.
tpluk
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