Laurie and Carl,
Yes, the Ruddy/White-headed Duck problem immediately comes to mind. This is the
most well-known example.
There are more examples in birds:
Introduced Bar-headed and Swan Geese and Canada Geese hybridise with each other
as well as with European birds - sometimes forming triple hybrids!
Mallards introduced from Europe cause trouble in their new homes too.
However, the report that Laurie posted is more complicated: Not only the exotic
fish species hybridises with each of the two native ones, but they cause triple
hybridisation between the exotic and both native ones which normally don't
hybridise with each other!
Yes, there are triple hybrids in birds, but I have never heard of this bridging
effect described in this report.
Nikolas
----------------
Nikolas Haass
Sydney, NSW
----- Original Message ----
From: Carl Clifford <>
To: L&L Knight <>
Cc: Birding Aus <>
Sent: Wednesday, July 23, 2008 5:33:27 PM
Subject: Re: [Birding-Aus] An interesting hybrid development
Laurie,
It does happen with birds. A good example is the problem arising in
Europe, where the American Ruddy Duck has started expanding its range
and has started interbreeding with the native White-headed Duck, which
was already endangered. This inter-breeding has exacerbated this
considerably, to the point that culls have been organised of the Ruddy
Duck. There is an informative page on Wikipedia about bird hybrids at
http://en.wikipedia.org/wiki/Bird_hybrid
Cheers,
Carl Clifford
On 23/07/2008, at 5:15 PM, L&L Knight wrote:
The following news item discusses how the introduction of an exotic
species led to the hybridisation of two related species that don't
normally hybridise ...
I'm not sure whether this might happen with birds ...
Regards, Laurie.
http://environment.newscientist.com/article/dn14373-alien-fish-creates-threeway-hybrid.html
Alien fish creates three-way hybrid
• 22:00 21 July 2008
• NewScientist.com news service
• Bob Holmes ==============================www.birding-aus.org
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