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Description
One hypothesis for why insects are smaller than vertebrates is that the blind-ended tracheal respiratory system challenges oxygen delivery for larger insects. Supporting this hypothesis, several studies have documented that larger insect species have larger gas transport structures than expected by isometric scaling. To further test this hypothesis, we performed the first inter-specific study of the scaling of spiracle size, using ten scarab beetle species, including some of the most massive insects. Using micro-CT, we measured the cross sectional area and depth of all eight spiracles. Areas of large spiracles in the anterior portion of the animal showed hypermetric scaling, varying approximately with mass^0.8. However, because diffusive capacities scaled with lower slopes than metabolic rates, larger beetles had a 10-fold higher required PO2 gradient across the spiracles to sustain oxygen consumption by diffusion. Despite this trend, calculations suggest that large beetles can exchange oxygen by diffusion across the spiracles at rest, but likely no beetles can do so during flight. Advective capacities through the spiracles scale with mass^1.8, suggestive of a switch toward greater use of convection and/or reduced required pressures in larger beetles.
ContributorsWagner, Julian Morgan (Author) / Harrison, Jon F. (Thesis director) / VandenBrooks, John (Committee member) / Miller, Laura (Committee member) / School of Mathematical and Statistical Sciences (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
ContributorsSchildkret, David (Conductor) / Chamber Singers (Performer) / ASU Library. Music Library (Publisher)
Created2018-02-10
ContributorsGlenn, Erica (Conductor) / Evans, Bartlett R. (Conductor) / Oh, Eun-Mi (Conductor) / Thompson, Jason D. (Conductor) / Schildkret, David (Conductor) / Concert Choir (Performer) / Arizona Statesmen (Performer) / Women's Chorus (Performer) / Gospel Choir (Performer) / Barrett Choir (Performer) / Chamber Singers (Performer) / Choral Union (Performer) / ASU Library. Music Library (Publisher)
Created2017-11-30
ContributorsUniversity Choirs (Performer) / ASU Library. Music Library (Publisher)
Created2000-11-16
ContributorsSchildkret, David (Conductor) / White, Jamilyn (Performer) / Krison, Danielle (Performer) / Barefield, Robert (Performer) / FitzPatrick, Carole (Performer) / Chamber Singers (Performer) / Choral Union (Performer) / Symphonic Chorale (Performer) / University Symphony Orchestra (Performer) / ASU Library. Music Library (Publisher)
Created2007-04-26
ContributorsLyne, Gregory K. (Performer) / Stutzman, Gina (Performer) / Woodgate, Lyn (Performer) / Cornner, Charles B. (Performer) / Rozukalns, Andris L. (Performer) / Women's Choir (Performer) / University Choir (Performer) / ASU Library. Music Library (Publisher)
Created1996-11-24
ContributorsCherland, Carl (Performer) / Fuller, Charles L. (Performer) / O'Brien, Robert (Performer) / Hooper, Wm. John (Performer) / Graduate Chorale (Performer) / Recital Chorale (Performer) / ASU Library. Music Library (Publisher)
Created1987-10-01
ContributorsRoueche, Michelle (Performer) / Partin, Darrell (Performer) / Wiest-Parthun, Karen (Performer) / Harvison, Emery (Performer) / Hernandez, Rene (Performer) / Foley, Laura (Performer) / Women's Choir (Performer) / ASU Library. Music Library (Publisher)
Created1994-04-21
ContributorsParthun, Karen (Conductor) / Hickman, Miriam, 1955- (Performer) / University Choir (Performer) / Vocal Jazz Ensemble (Performer) / ASU Library. Music Library (Publisher)
Created2000-11-19
ContributorsPeterson, Craig C. (Director) / Butler, Robb (Director) / Forkner, Christina (Contributor) / Leman, Christi (Performer) / Miller, Kenny (Musician) (Performer) / Howard, Johnothon (Performer) / Gibson, Ted (Performer) / Herberger Singers (Performer) / University Choir (Performer) / ASU Library. Music Library (Publisher)
Created2003-10-12