Apparently the Wrentit has never made it across the Columbia River.
http://en.wikipedia.org/wiki/Wrentit It is odd that such a shy bird should
have all its relatives in Asia.
Tim Murphy
-----Original Message-----
From:
Behalf Of Chris Sanderson
Sent: Tuesday, 26 June 2007 8:38 PM
To:
Cc:
Subject: Re: New Clements book
Hi Andrew,
Wouldn't a 50-100m wide river be an awful risk for a poor-flying shy species
known to not willingly cross paths let alone a river? It's not a case of
being incapable but unwilling I'd imagine? Don't know if this is the real
reason, but it sounds likely to me.
Regards,
Chris
On 6/26/07, Andrew Taylor <> wrote:
>
> On Tue, Jun 26, 2007 at 05:51:31PM +1000, Murray Lord wrote:
> > If you read the scientific literature you will find plenty of
> > justification for recent splits.
>
> And there may be plenty to come. I was at a couple of recent talks on
> evolution in Amazonian birds which presented genetic data suggested rivers
> may be more effective barriers to rainforest birds than you'd expect.
>
> For one Antbird, based on limited genetic sampling, the differentiation
> was such that it looked as though it should be split into five species.
> And for another species, a 9-way split was conceivable. This isn't a
> matter of changing species definitions - it looked to me these would
> be classical BSC species. The presenters didn't discuss this. They
> were focused on evolutionary history, not species status.
>
> I don't understand how a 50-100m wide river acts as a such a long-term
> barrier and there is obviously a great deal of research to be done
> but in the next decade or so expect a lot a splitting where birds have
> pan-Amazonian distribution
>
> Andrew
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