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    A comparative analysis of marine mammal tracheas

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    Date
    2013-11
    Author
    Moore, Colby D.  Concept link
    Moore, Michael J.  Concept link
    Trumble, Stephen J.  Concept link
    Niemeyer, Misty E.  Concept link
    Lentell, Betty J.  Concept link
    McLellan, William A.  Concept link
    Costidis, Alexander M.  Concept link
    Fahlman, Andreas  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6637
    As published
    https://doi.org/10.1242/​jeb.093146
    Keyword
     Diving; Lung collapse; Pressure-volume; Compliance; Diving physiology; Alveolar compression 
    Abstract
    In 1940, Scholander suggested that stiffened upper airways remained open and received air from highly compressible alveoli during marine mammal diving. There are little data available on the structural and functional adaptations of the marine mammal respiratory system. The aim of this research was to investigate the anatomical (gross) and structural (compliance) characteristics of excised marine mammal tracheas. Here we defined different types of tracheal structures, categorizing pinniped tracheas by varying degrees of continuity of cartilage (categories 1-4) and cetacean tracheas by varying compliance values (categories 5A and 5B). Some tracheas fell into more than one category, along their length, for example, the harbor seal (Phoca vitulina) demonstrated complete rings cranially, and as the trachea progressed caudally tracheal rings changed morphology. Dolphins and porpoises had less stiff, more compliant spiraling rings while beaked whales had very stiff, less compliant spiraling rings. The pressure-volume (P-V) relationships of isolated tracheas from different species were measured to assess structural differences between species. These findings lend evidence for pressure-induced collapse and re-inflation of lungs, perhaps influencing variability in dive depth or ventilation rates of the species investigated.
    Description
    Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 217 (2014): 1154-1166, doi:10.1242/​jeb.093146.
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    • Biology
    Suggested Citation
    Preprint: Moore, Colby D., Moore, Michael J., Trumble, Stephen J., Niemeyer, Misty E., Lentell, Betty J., McLellan, William A., Costidis, Alexander M., Fahlman, Andreas, "A comparative analysis of marine mammal tracheas", 2013-11, https://doi.org/10.1242/​jeb.093146, https://hdl.handle.net/1912/6637
     
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