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Israel Journal of Zoology
  Issue:  Volume 47, Number 1 / 2001
  Pages:  70 - 77
  URL:  Linking Options

   Special Issue: Environmental Challenge and Physiological Coping Mechanisms
  Guest Editor(s): M. Horowitz and A. Haim
 
EFFECTS OF TEMPERATURE AND BATH OXYGEN PARTIAL PRESSURE ON RESPIRATORY BEHAVIOR OF A FROG

SHLOMO SHPUN A1, NIRA GIL A1, URI KATZ A1

A1 Department of Biology, Technion—Israel Institute of Technology, Haifa 32000, Israel

Abstract:

Respiratory behavior (ratio of diving to surface time) of a frog (Rana ridibunda)in response to changes in water temperature and oxygen partial pressure, was studied in the laboratory. Venous blood was withdrawn from the vena angularisin the mouth at the end of the observation sessions and blood hemoglobin saturation was determined with a hemoximeter. It was observed that diving duration was inversely related to temperature. Saturation of blood hemoglobin in hypoxic (N2; <50 mmHg O2) condition took 45 min to decrease from35% to 10%. When bath oxygen partial pressure was maintained at constant temperature, frogs did not surface until hemoglobin oxygen saturation decreased to below 10%. The skin is the main avenue for the elimination of metabolic carbon dioxide in amphibia, but is also an important avenue for oxygen diffusion in water. The experiments show that oxygen accessibility by diffusion through the skin is an important determinant of the respiratory behavior in the frog, but it becomes limited at extreme ambient conditions.


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