Split of Rockhopper Penguin

To: <>
Subject: Split of Rockhopper Penguin
From: "Peter Shute" <>
Date: Thu, 8 Feb 2007 09:55:42 +1100
 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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