Resp CV - Chapter 44 2

Resp CV - Chapter 44 2 - Increased Atmospheric Oxygen Could...

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Unformatted text preview: Increased Atmospheric Oxygen Could Allow for Longer Tracheae ASU Research Magazine Longer Tracheae = Bigger Insects Do O2 delivery problems limit insect body size? Interspecific Comparisons: evolution Ontogenetic Comparison: developmental physiology 1st instar (15 mg) Adult (2150 mg) Schistocerca americana Kirkton et al. 2005 X-ray Synchrotron at Argonne National Laboratories outside Chicago, IL On going collaboration: Union College and ND State Insect preparation in X-ray beam with CCD camera Beam does not affect insect physiology. Socha et al ., 2007 Early X-ray work was on beetles Westneat et al 2003 X-ray Synchrotron: Larger/older grasshoppers have more air sacs Respiratory structures make up greater fraction of tr = tracheae; as= air sacs; sp=spiracles 1st instar abdomen Adult abdomen Larger animals devote proportionally more of their body to respiratory structures = tracheae p<0.001, r2=0.64 = air sacs p<0.001, log fraction of respiratory structure Greenlee et al. 2009 Click to edit Master subtitle style 4/7/11 How Do Lungs Work? 4/7/11 Fig 44.9 4/7/11 Fig Click to edit Master subtitle style 4/7/11 4/7/11 Fig 44.9 4/7/11 Loading of O2 at lung Unloading of O2 at tissue Click to edit Master subtitle style...
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This note was uploaded on 04/06/2011 for the course BIO 101 taught by Professor Freeman during the Spring '11 term at Union.

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Resp CV - Chapter 44 2 - Increased Atmospheric Oxygen Could...

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