期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 214, 期 22, 页码 3822-3828出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.056366
关键词
lung mechanics; total lung capacity; minimum air volume; excised lung; diving physiology
类别
资金
- International Fund for Animal Welfare
- NMFS Northeast Fisheries
- Office of Naval Research [N00014-10-1-0059]
- National Institutes of Health [HL 52586]
Excised lungs from eight marine mammal species [harp seal (Pagophilus groenlandicus), harbor seal (Phoca vitulina), gray seal (Halichoerus grypus), Atlantic white-sided dolphin (Lagenorhynchus acutus), common dolphin (Delphinus delphis), Risso's dolphin (Grampus griseus), long-finned pilot whale (Globicephala melas) and harbor porpoise (Phocoena phocoena)] were used to determine the minimum air volume of the relaxed lung (MAV, N=15), the elastic properties (pressure-volume curves, N=24) of the respiratory system and the total lung capacity (TLC). Our data indicate that mass-specific TLC (sTLC, l kg(-1)) does not differ between species or groups (odontocete vs phocid) and agree with that estimated (TLC(est)) from body mass (M(b)) by applying the equation: TLC(est)=0.135M(b)(0.92). Measured MAV was on average 7% of TLC, with a range from 0 to 16%. The pressure-volume curves were similar among species on inflation but diverged during deflation in phocids in comparison with odontocetes. These differences provide a structural basis for observed species differences in the depth at which lungs collapse and gas exchange ceases.
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