Re: birding-aus birds' respiratory system

Subject: Re: birding-aus birds' respiratory system
From: Mark Chappell <>
Date: Thu, 6 May 1999 09:39:13 +1000
**** Ah, yes.  Oops.  The correct formula SHOULD have been:

extraction = (oxygen in inspired air - oxygen in expired air)/oxygen in
inspired air

  sorry for any confusion....  Mark C

>Thanks very much for this interesting and illuminating contribution to this
>increasingly scientific thread, Mark.
>One point:   Is your "O2 Extraction" equation correct?  As you have written
>it a more efficient animal (ie one which extracts a higher % of the
>available oxygen) would have a LOWER O2 Extraction, not higher.  However,
>logical use of the concept of O2 extraction would have the figure higher in
>more efficient animals (as your figures suggest).  Is the ratio in fact the
>REDUCTION in the O2 tension (or %) in expired air compared with inspired air??
>            _____________________
>From:    Dr Richard Nowotny,
>             Melbourne, Australia.
>             Tel. (w) 61-3-9214.1420
>             <>
>            _____________________

       Mark Chappell, Biology Department, UC Riverside
              until Aug '99:  C/O Dr. Bill Buttemer
       Dept. Biological Sciences, University of Wollongong
       Wollongong NSW 2522 AUSTRALIA

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