Waarneming.nl

Soortgroepen => Wat is dit voor vogel? / Determinatie => Vogels => Hybriden => Topic gestart door: Alcedo atthis op juni 03, 2008, 17:57:10 pm

Titel: australische Kasarka???
Bericht door: Alcedo atthis op juni 03, 2008, 17:57:10 pm
http://waarneming.nl/foto_details.php?id=24279 (http://waarneming.nl/foto_details.php?id=24279)

from this photo hybrids  Tadorna tadorna x Tadorna ferruginea are not excluded
Titel: australische Kasarka???
Bericht door: redmar_woudstra op juni 03, 2008, 18:10:43 pm
The "waarnemer" also stated in the comment section that the birds are most possibly hybrids.  
Titel: australische Kasarka???
Bericht door: Alcedo atthis op juni 04, 2008, 10:05:51 am
Yes, I understood that it is thought to be a possible hybrid,  but what i wanted to say was:
I think that alone  from this photo it could well be hybrids between tadorna and ferruginea, no need to involve tadornoides

compare with this tadorna x ferruginea hybrid:

http://www.flickr.com/photos/martynf65/240...ool-hybridbirds (http://www.flickr.com/photos/martynf65/2400819064/in/pool-hybridbirds)

http://www.flickr.com/photos/martynf65/240...ool-hybridbirds (http://www.flickr.com/photos/martynf65/2400819688/in/pool-hybridbirds)

http://www.flickr.com/photos/martynf65/240...ool-hybridbirds (http://www.flickr.com/photos/martynf65/2400819416/in/pool-hybridbirds)

sorry if I wasn´t clear before.
Titel: australische Kasarka???
Bericht door: Jan Harteman op juni 05, 2008, 22:14:22 pm
I think you might be right. Common shelduck is a common duck species (as its name says ;) ) and the Ruddy shelduck is getting more common as well, so the chance they would hybridize is much bigger than a hybrid with the Australian shelduck involved.
Titel: australische Kasarka???
Bericht door: redmar_woudstra op juni 05, 2008, 23:02:01 pm
Thanks Jörn, it is now more clear ;)

In that particular area Ruddy Shelducks are more common than in other parts of Holland. Strange that these hybrids look so much like the tadornoides!
Titel: australische Kasarka???
Bericht door: Alcedo atthis op augustus 25, 2008, 16:30:24 pm
I don´t know if this fits with experience of others , but in my experience  there is this:

In most T. tadorna x ferruginea, from breast along the flanks the colour gets lighter towards the rear end of the flanks (Breast being darkest).

In T. tadornoides the breast ist lighest (and at least in some hybrids of Tadoernoides this is similar).

(I know that different colours are involved from breast to rear flanks) I just comment on how light/ or dark colour is)