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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