[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: New Ruben Paper
Not quite - the premise is that several adaptations of the avian hip
and femur excursion allow the pelvic girdle and thigh musculature to
help support the lower, lateral abdominal walls, which appears to
provide resistance to collapse for the posterior abdominal air sacs in
living birds. It's actually a neat finding, and not at all
implausible. The problems don't hit until later in the discussion, at
which point the authors make a number of poor assumptions, including
(but not limited to): 1) lack of the modern-condition air sac
expansion makes flight impossible; 2) lack of the modern-condition
posterior air sac expansion means a flow-through lung was not present,
and 3) the only way to support the posterior air sacs is with the
pelvic condition seen in living neornithines.
I'd be curious to hear what the authors think of flight and
respiration in pterosaurs.
Michael Habib, M.S.
Center for Functional Anatomy and Evolution
Johns Hopkins School of Medicine
1830 E. Monument Street
Baltimore, MD 21205
On Jun 9, 2009, at 4:19 PM, Mark Hallett wrote:
As we always say, "wait for the paper", but is Ruben's entire
premise actually based (on the the implication as I understand it
from the SCIENCE DAILY article) that birds have inflexible or only
potentially flexible knee joints? This is incorrect. --Mark
--- On Tue, 6/9/09, Mike Taylor <email@example.com> wrote:
From: Mike Taylor <firstname.lastname@example.org>
Subject: New Ruben Paper
Date: Tuesday, June 9, 2009, 9:18 AM
From the article:
"Frankly, there's a lot of museum
politics involved in
this, a lot of careers committed to a
of view even if new scientific evidence
questions," Ruben said.
/o ) \/ Mike Taylor <email@example.com>
)_v__/\ "Don't you practise your alliteration on me!"
-- Monty Python.