Abstract
1. 1. The effect of oxygen tension, p o 2, on oxygen uptake and tolerance to anoxia have been studied by exposure in nitrogen atmosphere and diving in the water snakes Helicops modestus and Liophis miliaris, at 25°C. 2. 2. The critical P o 2, was the same (70mmHg O 2) for both species, but below that tension H. modestus showed a higher degree of dependence on P o 2. 3. 3. Anoxia tolerance time was longer (14 min for H. modestus and 4 min for L. miliaris) during forced dive than during exposure to a 100% nitrogen atmosphere. No difference was found in pre- and post-forced dive oxygen uptake values in both species. 4. 4. The maximum duration of a voluntary dive was shorter than the mean tolerance time to forced dives in L. miliaris. but longer in H. modestus. 5. 5. H. modestus, the more aquatic species, is significantly more tolerant of complete anoxia (100% N 2 exposure) and submersion.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Comparative Biochemistry and Physiology -- Part A: Physiology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
