[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Microraptor also ate fish
On Mon, Apr 29, 2013 at 9:43 PM, Mickey Mortimer
> Technically, everything is adapted to do what it does, since mutation causes
> most changes and the species has survived.
Well, but not every trait in existence is selected for -- some are due
to drift. Intuitively I feel like it should be fairly easy to tell the
difference, but objectively I'm pretty sure we have a lot more legwork
> I was thinking more in the sense of what we as paleontologists think of as
> "adaptations for x" not being present in a significant proportion of taxa
> which are x. So sure an elongate grasping pes is an adaptation for
> arboreality, but how many species which spend e.g. >30% of their time in
> trees actually have that trait, and how much can it be compensated for by
> other traits? Or alternatively, how many species which spend e.g. >30% of
> their time in trees aren't significantly different osteologically from
> species which spend e.g. <5% of their time in trees? How strict/misleading
> are the osteological correlates we look for, basically.
Right, this stuff would be very interesting to know.
T. Michael Keesey