Static inflation and deflation pressure-volume curves from excised lungs of marine mammals.

Published

Journal Article

Excised lungs from eight marine mammal species [harp seal (Pagophilus groenlandicus), harbor seal (Phoca vitulina), gray seal (Halichoerus grypush), 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)=0.135 M(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.

Full Text

Duke Authors

Cited Authors

  • Fahlman, A; Loring, SH; Ferrigno, M; Moore, C; Early, G; Niemeyer, M; Lentell, B; Wenzel, F; Joy, R; Moore, MJ

Published Date

  • November 2011

Published In

Volume / Issue

  • 214 / Pt 22

Start / End Page

  • 3822 - 3828

PubMed ID

  • 22031747

Pubmed Central ID

  • 22031747

Electronic International Standard Serial Number (EISSN)

  • 1477-9145

International Standard Serial Number (ISSN)

  • 0022-0949

Digital Object Identifier (DOI)

  • 10.1242/jeb.056366

Language

  • eng