spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Wilkes, P. R. H.
Right arrow Articles by Wood, C. M.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Wilkes, P. R. H.
Right arrow Articles by Wood, C. M.
Journal of Experimental Biology 91,239-254 (1981)
Published by Company of Biologists 1981

Respiratory, Ventilatory, Acid-Base and Ionoregulatory Physiology of the White Sucker Catostomus Commersoni: The Influence of Hyperoxia

P. R. H. Wilkes 1, R. L. Walker 2, D. G. McDonald 3, and C. M. Wood 3

1 Department of Biology, The University of Calgary, Calgary, Alberta, Canada T2N 1N4
2 Department of Biology, The University of Calgary, Calgary, Alberta, Canada T2N 1N4.
3 Department of Biology, McMaster University, Hamilton, Ontario, Canada L8S 4K1

Blood gases, acid–base status, plasma ions, respiration, ventilation and cardiovascular function were measured in white suckers, using standard cannulation methods. Basic respiratory parameters under normoxia were compared to those in the active, pelagic rainbow trout and in other benthic teleosts. Sustained environmental hyperoxia (350–550 torr) increased arterial O2 (102–392 torr) and venous O2 (17–80 torr) tensions so that blood O2 transport occurred entirely via physical solution. Dorsal aortic blood pressure and heart rate fell, the latter due to an increase in vagal tone. Ventilation volume declined markedly (by 50%) due to a decrease in ventilatory stroke volume, but absolute O2 extraction rose so that O2 consumption was unaffected. While the preceding effects were stable with time, arterial and venous CO2 tensions approximately doubled within 4 h, and continued to increase gradually thereafter. This CO2 retention caused an acidosis (7.993–7.814) which was gradually compensated by an accumulation of plasma [HCO3-]. However, even after 72 h, arterial pH remained significantly depressed by 0.10 units. The gradual rise in plasma [HCO3-] was accompanied by a progressive fall in both [Na+] and [Cl–]; [K+] and [Ca2+] remained unchanged. The responses of the sucker to hyperoxia are compared to those of the rainbow trout.

Submitted on May 29, 1980




This article has been cited by other articles:


Home page
 J. Exp. Biol.Home page
R. F. Burton
Evolutionary determinants of normal arterial plasma pH in ectothermic vertebrates
J. Exp. Biol., March 1, 2002; 205(5): 641 - 650.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
J. McKendry and S. Perry
Cardiovascular effects of hypercarbia in rainbow trout (Oncorhynchus mykiss): a role for externally oriented chemoreceptors
J. Exp. Biol., January 1, 2001; 204(1): 115 - 125.
[Abstract] [PDF]

Home page
 J. Exp. Biol.Home page
S. Perry, R Fritsche, T. Hoagland, D. Duff, and K. Olson
The control of blood pressure during external hypercapnia in the rainbow trout (Oncorhynchus mykiss)
J. Exp. Biol., January 8, 1999; 202(16): 2177 - 2190.
[Abstract] [PDF]


© The Company of Biologists Ltd 1981