My records show Eudyptes chrysocome as being the eastern race and
Eudyptes (c?) moseleyi as being the WA race. So far this discussion has
ignored the third race Eudyptes c. filholi. What does anyone know
about this third race? i.e. where is it supposed to be found and in what
ways does it vary from the other two.?
None of this splitting/lumping is of any significance to my personal
bird counts - I haven't seen any of them. Grrr.
Tony.
-----Original Message-----
From:
On Behalf Of Peter Shute
Sent: Thursday, February 08, 2007 9:26 AM
To:
Subject: Split of Rockhopper Penguin
wrote on Wednesday, 7 February 2007
5:08 PM:
>>> The divergence in mating signals
>>> found between these two taxa seems to have occurred recently and
>>> relatively rapidly.
>>
>> Forgive my ignorance, but how do they know that?
>
> If it's anything like the grasshoppers mentioned in Richard Dawkins'
> book "The Ancestor's Tale", the difference in mating signals is
> probably most distinct where the two taxa
> overlap(?) than at the extremes of their ranges. Once the speciation
> event occurs (for whatever reason), there is positive selective
> pressure to drive the two species apart (different calls, colours,
> behaviours or
> whatever) to avoid unproductive interbreeding.
Yes, but how can they tell it happened recently and rapidly?
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