Literaturdatenbank
Literaturdatenbank |
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Stone, P. A., Dobie, J. L., & Henry, R. P. (1992). Cutaneous surface area and bimodal respiration in soft-shelled (trionyx spiniferus), stinkpot (sternotherus odoratus), and mud turtles (kinosternon subrubrum). Physiological zoology, 65, 311–330.
Added by: Admin (23 Aug 2008 15:33:16 UTC) Last edited by: Beate Pfau (02 Aug 2009 18:21:15 UTC) |
| Resource type: Journal Article BibTeX citation key: Stone1992a View all bibliographic details  |
Categories: General Keywords: Apalone, Apalone spinifera, Kinosternidae, Kinosternon, Kinosternon subrubrum, Physiologie = physiology, Schildkröten = turtles + tortoises, Sternotherus, Sternotherus odoratus, Trionychidae Creators: Dobie, Henry, Stone Collection: Physiological zoology |
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| Abstract |
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Trionyx spiniferus Sternotherus odoratus Kinosternon subrubrum Total mass-specific cutaneous surface area was determined for three species of freshwater turtles: Trionyx spiniferus, Sternotherus odoratus, and Kinosternon subrubrum. Similarly sized individuals of the three species exhibited high, intermediate, and low values of cutaneous surface area, respectively. Respiratory gas exchange in both air and water was measured in unrestrained individuals of each species. Because the T. spiniferus used in these experiments were on the average over an order of magnitude heavier than the S. odoratus, these two species had similar mass-specific cutaneous surface areas, whereas both had considerably higher values than K. subrubrum. All species were biomodal breathers, exchanging gases with both air and water. The percent aquatic .ovrhdot.VO2 and .ovrhdot.VCO2 were highest in soft-shells (38% and 85%, respectively), intermediate in stinkpots (26% and 56%), and lowest in mud turtles (14% and 46%). The inverse pattern was observed for aerial gas exchange. Reggression analysis (cutaneous surface area vs. percent aquatic .ovrhdot.VO2) with ANOVA on the residuals indicated that T. spiniferus was more reliant on aquatic gas exchange than could be explained by cutaneous surface area alone. A similar analysis using .ovrhdot.VO2 as the dependent variable indicated that cutaneous surface are explained most of the differences in .ovrhdot.VO2. The interpretation of these results was not substantially altered when differences in proportional skeletal mass between the species were taken into account. The results show that aquatic gas exchange is important even in species with few adaptations that facilitate such exchange and that the degree of aquatic gas exchange is directly related to the mass-specific cutaneous surface area across which gases can diffuse.
Added by: Admin Last edited by: Beate Pfau |