Literaturdatenbank
Literaturdatenbank |
|
 |
|
Stone, P. A., Dobie, J. L., & Henry, R. P. (1992). The effect of aquatic o2 levels on diving and ventilatory behavior in soft-shelled (trionyx spiniferus), stinkpot (sternotherus odoratus), and mud turtles (kinosternon subrubrum). Physiological Zoology, 65(2), 331–345.
Added by: Admin (25 Aug 2010 21:58:59 UTC) |
| Resource type: Journal Article BibTeX citation key: Stone1992 View all bibliographic details  |
Categories: General Keywords: Kinosternidae, Kinosternon, Kinosternon subrubrum, Physiologie = physiology, Schildkröten = turtles + tortoises, Sternotherus, Sternotherus odoratus Creators: Dobie, Henry, Stone Collection: Physiological Zoology |
Views: 2/586
Views index: 11% Popularity index: 2.75% |
| Abstract |
|
Diving and ventilatory behavior were observed in three species of bimodally breathing turtles: Trionyx spiniferus, Sternotherus odoratus, and Kinosternon subrubrum. These turtles have high, intermediate, and low reliances on aquatic gas exchange, respectively. Turtles with access to normoxic air were filmed in normoxic, hypoxic, and hyperoxic water. Ninety percent of all dives were shorter than 20 min. Despite differences in the partitioning of respiratory gas exchange, dive duration in normoxia did not differ among species. Dive duration was directly proportional to aquatic PO2 in soft-shells and independent of aquatic PO2 in mud turtles. Stinkpots had consistently but not significantly shorter dives in normoxia. Aquatic PO2 had no effect on the ventilation patterns of soft-shells. Regardless of PO2, soft-shells typically engaged in one breathing bout, during which one breath was taken, per emersion period. Stinkpots and mud turtles underwent more bouts of breathing per emersion period and took more breaths per breathing bout than did soft-shells. Stinkpots in normoxia took more breaths than in hypoxia or hyperoxia, while mud turtles showed no response to aquatic PO2. These results agree with previous research that found soft-shells to be the least reliant of the three species on aerial respiration. These results also indicate that aquatic PO2 is an important factor in the regulation of diving and ventilatory behavior in at least some bimodally breathing turtles.
Added by: Admin |