[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Venom in Sinornithosaurus
Aw, c'mon! Cobras are cursorial relative to what? Vipers?
Perhaps I used "cursorial" in an inexact manner here, but on a functional
level, snakes are _slow_. They require slow prey, or some strategy (e.g., venom
or ambush) to negate the speed advantage of (e.g.) a rabbit.
As to the selective advantage of poison in weakening resistance, in addition to
preventing escape, good point, and it fits well w/ an incremental scenario...
I am still however, unaware of any fast 'envenom-aters'.
--- On Thu, 12/24/09, Jura <email@example.com> wrote:
> From: Jura <firstname.lastname@example.org>
> Subject: Re: Venom in Sinornithosaurus
> To: email@example.com
> Date: Thursday, December 24, 2009, 2:06 PM
> --- On Thu, 12/24/09, don ohmes
> > Assuming bipedal bodystyles can be shown in general to
> > associated w/ cursorial lifestyles; and that
> > envenomation strategies, and the presence of venom in
> > vertebrates generally, is associated with slowness of
> > locomotion* -- It is not obvious what combination of
> > lifestyle and environment would be likely to elicit
> > cursorial locomotion and a venom system in a predator
> > simultaneously. It also seems intuitively unlikely
> that a
> > fit cursorial predator would evolve an effective
> > system, at least not w/out some loss of locomotive
> Actually vipers are the only venomous vertebrate group that
> I can think of, that show an association of venom with a
> slow and "sluggish" lifestyle (hmm, I suppose lionfish do
> too, though that's a bit different). The other major
> venomous snake group (Elapidae) is composed of cursorial
> The point of venom is not always to keep prey from getting
> away. One of its main advantages is that it reduces the
> ability of prey to fight back, thus reducing potential
> injury to the predator.