Re: Speciation - how do you know?

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Nick Maclaren wrote:
>
> When you bring the time dimension into it, things become much more
> confused. For example, you would agree that mammals give birth to
> infants of their own species? Well, we have continuous descent from
> a proto-human that was unquestionably not of our species, if we go
> back far enough. At some point, one species will have changed into
> another, between generations :-)
>

This isn't really the way it works. A new species doesn't appear
"between generations". In fact, there are no well-defined speciation
events. Speciation is something that can only be recognized well after
the fact.

BTW, are hybrids of lions and tigers really fertile?

Steve Barnard

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• Maybe in reply to: Tim Edwards and/or Marghie Parsons: "Speciation - how do you know?"
• Next in thread: Stephen Barnard: "Re: Speciation - how do you know?"