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Re: The Roosting Hypothesis
Well, just to stress a point -- I've never consciously advanced GFTR as a
hypothesis -- it is just a lifestyle -- speculative selective implications of
which falsify a hypothesis. E.g., that a trees-down flight path would
inevitably be coupled with or presaged by "arboreal" skeletal adaptations.
If I actually used the phrase "GFTR hypothesis", it was my mistake, and I
Although it definitely predicts worn claws :).
I also think that GSP's effort to rule habitual terrestrial with the hind foot
as out or in is extremely sensible, even long overdue.
On Fri, Jul 12, 2013 8:11 PM EDT Mike Habib wrote:
>On Jul 12, 2013, at 4:13 PM, don ohmes <email@example.com> wrote:
> 2) the most compelling reason to put the birds-to-be in general -- and the
> specific specimens we talk about -- into trees, is that the trees were there.
> As viable as a GFTR lifestyle is today, it logically "must" have offered even
> more benefits to small bipeds at some point in the Triassic/Jurassic
> timeframe. I base this in part on the idea that foraging in a tree is more
> difficult than simply hiding in one.
> It follows that, pteros notwithstanding, the safety benefits accruing to even
> marginal tree-climbing talents in a largely ground-based animal would have
> been significant -- especially given that it's major predators were also
> short-armed bipeds. And indeed, the pteros may have been crucial to driving
> morphology aiding rapid escape *from* a tree.
>Agreed, it is not hard to see how that set of behaviors might reduce
>mortality/improve nesting. The complication, of course, is that this doesn't
>mean all taxa (or even any taxa) actually used that advantage. That's not
>bad, as plausibility is often all we can get, but it does mean that building
>further downstream predictions is pretty tenuous (for example, trying to
>create elaborate arboreal flight origin scenarios).
> Congrats on the new gig, BTW...
>Thanks! SoCal treats me well. I don't know if DMLers are going to SVP, but I
>live near the conference hotel. I could recommend a DML breakfast location if
>folks wanted to do that.
>Assistant Professor of Cell and Neurobiology
>Keck School of Medicine of USC
>University of Southern California
>Bishop Research Building; Room 403
>1333 San Pablo Street, Los Angeles 90089-9112