11 de septiembre de 2020

White egrets and herons | East Asia

Struggling with distant white egrets, this might give an answer
https://ebird.org/malaysia/news/chinese-egrets-in-malaysia-where-when-and-how-to-find-them

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02 de julio de 2020

jp dragonfly pages

useful odonata pages
https://www.odonata.jp/03imago/index.html
http://yagopedia.com/refbook.php?tombo=33 (maybe around for years, first time I see it was july 2 2020)

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23 de junio de 2020

Neope goschkevitschii vs Neope niphonica

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25 de abril de 2020

ID of Mnais demoiselles in Japan - work in progress

My first odonata in Japan were those gorgeous orange-winged streamdwellers I had hoped to see. Then came the difficulty of ID'ing them properly.

Hopefully i will be able to store here some information on the two Mnais-species represented in Japan..

WORK IN PROGRESS --- INITIAL PHASE

1 id certain based on confusing map:
https://www.inaturalist.org/observations/18800588
wingcolour of female is smokey: costalis only feature

1 id certain based on low number of cells next to pterostigma
https://www.inaturalist.org/observations/18806161

https://www.inaturalist.org/observations/18869536

costalis: as no orange winged pruinosa lives in this area
https://www.inaturalist.org/observations/22020143

read more about wingcells and veinage
http://www.odonata.jp/03imago/Calopterygidae/index.html#vein
https://link.springer.com/chapter/10.1007/978-981-10-4956-9_17

wings of both male and female of both species
https://ai2-s2-public.s3.amazonaws.com/figures/2017-08-08/e307ef137cc53f28a193ecb5c2d5a25f10c122b6/2-Figure1-1.png

further info
on habitat segregation of pruinosa and costalis
https://www.tandfonline.com/doi/abs/10.1080/13887890.2012.762745

and in Japanese
https://yoda1.exblog.jp/19813772/
on cellnumbers (different approach, hopefully same result)
http://dranathis.blog.fc2.com/blog-entry-352.html

CELL COUNT important feature? (maybe a simplification on my part)
cell count may be a good feature (as odonata.jp explains) Sofar (4 june 2020) I only found one costalis male (ID based on location up north) with something that looks like bigger cells next to the pterostigma
https://www.inaturalist.org/observations/17243744

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20 de noviembre de 2019

large Japanese cormorants*

Two smaller cormorants are fairly easily identified. The two bigger Great Cormorant (Phalacrocorax carbo hanedae) and Japanese - or Temminck's - Cormorant cause more trouble.
Subt;e differences are recognised but not always easily applied in the field.
Because I too struggle often, I will give the main ID-paper links here... in the hope to get this problem fixed sometime soon and to help others maybe to ID their Japanese larger phalacrocorax records.

NB. feel free to comment, add links to (japanese) texts or....

thanks in advance.

Temminck's <> hanedae Great Cormorant
http://www.birdskoreablog.org/?p=14250
https://www.dutchbirding.nl/journal/pdf/DB_1999_21_1.pdf
http://www.biodic.go.jp/kawau/d_hogokanri/hunt_leaflet.pdf

general features to be checked:
Phalacrocorax capillatus
PRO
broad and high ending white cheek
angular yellow patch
slightly more gentle , sloping head.

Location: both species may occur inland and in coastal areas. I don't think that is a safe IDentifier. General opinion though apparently is that capillatus is more tied to the coast,

the hue of adult breeding bird mantles is often suggested to be a distinguishing feature. As perception of colour greatly depends on the lighting i suppose it is a feature that should probably be used as a supporting feature rather than a prime identifyer (but that is just a layman speaking, perhaps)

*
NB. I don't claim scientific status for these scribbles. It's just a reminder of what to look for.

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08 de julio de 2019

on rock pigeons and feral pigeons

An elaborate piece has been written about it at ebirds...

https://ebird.org/news/rock-pigeon/

There could be an argument to just accept Feral pigeon behaviour in cities as feature of their natural addaptability. But that only would only be right in Eurasia and Africa, where the birds might have arrived on their own.
Australia and the Americas would probably have not been colonized if not for the active import of Feral Pigeons by mostly European settlers.

The species apparently is native here:
https://www.iucnredlist.org/species/22690066/86070297

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26 de abril de 2019

01 de marzo de 2019

Black-eared Kite < > Black Kite

While improving my visual knowledge of Japanese and East-Asian Black Kites i'm collecting information on the (sub)species in the area.
An alleged Black-eared Kite has been ID'd in Britain (https://www.birdguides.com/articles/what-is-a-black-eared-kite/)

so maybe not all black kites in East-Asia are Black-eared.

  • articles in random order - No scientific base, just a basic reference.

http://www.elisanet.fi/antero.lindholm/Caluta/Caluta2_l.pdf

https://www.dropbox.com/s/ccwpydvmjl0okgw/Kite.BlackEared.Pariah.2014.pdf

work in progress: distinguishing black kites subspecies

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