Geavanceerd zoeken  

Nieuws:

Pagina's: [1]   Omlaag

Auteur Topic: australische Kasarka???  (gelezen 265 keer)

0 leden en 1 gast bekijken dit topic.

Alcedo atthis

  • Admins
  • Offline Offline
  • Berichten: 783
australische Kasarka???
« Gepost op: juni 03, 2008, 17:57:10 pm »

http://waarneming.nl/foto_details.php?id=24279

from this photo hybrids  Tadorna tadorna x Tadorna ferruginea are not excluded
Gelogd
greetings,
Jörn Lehmhus

redmar_woudstra

  • Member
  • Offline Offline
  • Berichten: 2975
australische Kasarka???
« Reactie #1 Gepost op: juni 03, 2008, 18:10:43 pm »

The "waarnemer" also stated in the comment section that the birds are most possibly hybrids.  
Gelogd
groet,
Redmar

Alcedo atthis

  • Admins
  • Offline Offline
  • Berichten: 783
australische Kasarka???
« Reactie #2 Gepost 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/martynf65/240...ool-hybridbirds

http://www.flickr.com/photos/martynf65/240...ool-hybridbirds

sorry if I wasn´t clear before.
Gelogd
greetings,
Jörn Lehmhus

Jan Harteman

  • Member
  • Offline Offline
  • Berichten: 1838
    • Harteman Wildfowl
australische Kasarka???
« Reactie #3 Gepost 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.

redmar_woudstra

  • Member
  • Offline Offline
  • Berichten: 2975
australische Kasarka???
« Reactie #4 Gepost 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!
Gelogd
groet,
Redmar

Alcedo atthis

  • Admins
  • Offline Offline
  • Berichten: 783
australische Kasarka???
« Reactie #5 Gepost 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)
Gelogd
greetings,
Jörn Lehmhus
Pagina's: [1]   Omhoog
 

Pagina opgebouwd in 0.024 seconden met 19 queries.