[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Origin of bird flight: ontogenetic-transitional wing (OTW) hypothesis
It might also be worth mentioning that the fast upstroke can be a mechanism
for increasing the power output of the upstroke muscles relative to the
downstroke muscles (due to the increased contraction speed of the upstroke
muscles). Like Mike, I have some reservations about whether this was
readily available to early birds because of their shoulder geometry.
----- Original Message -----
From: "MICHAEL HABIB" <firstname.lastname@example.org>
Sent: Thursday, January 24, 2008 12:41 AM
Subject: Re: Origin of bird flight: ontogenetic-transitional wing (OTW)
Considering that basal birds had a deltoideus-driven upstroke, and
possibly less humeral elevation than modern taxa, it may be that the
incline-running type mechanics were unavailable to them.