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


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

First published online June 15, 2007
Journal of Experimental Biology 210, 2311-2319 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.02778
This Article
Right arrow Figures Only
Right arrow Full Text
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 Similar articles in PubMed
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 Alton, L. A.
Right arrow Articles by Seymour, R. S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Alton, L. A.
Right arrow Articles by Seymour, R. S.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Effect of aerial O2 partial pressure on bimodal gas exchange and air-breathing behaviour in Trichogaster leeri

Lesley A. Alton1,*, Craig R. White1,2 and Roger S. Seymour1

1 Environmental Biology, School of Earth and Environmental Sciences, University of Adelaide, Adelaide, South Australia, 5005, Australia
2 School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

* Author for correspondence (e-mail: lesley.alton{at}alumni.adelaide.edu.au)

Accepted 15 March 2007

The effects of experimental alterations of aerial O2 partial pressure (PO2,air) on bimodal gas exchange and air-breathing behaviour were investigated in the aquatic air-breathing fish Trichogaster leeri in normoxic water. Fish responded to increasing PO2,air by decreasing air-breathing frequency, increasing aerial O2 consumption rate (VO2), increasing mean O2 uptake per breath (VO2/breath) and decreasing aquatic VO2 to maintain a constant total VO2. The rate of oxygen uptake from the air-breathing organ (ABO) during apnoea (VO2,ap) was derived on a breath-by-breath basis from VO2/breath and apnoea duration. VO2,ap and estimates of ABO volume were used to calculate the PO2 in the ABO at the end of apnoea. This increased with increasing PO2,air, suggesting that ABO-PO2 is not regulated at a constant level by internal chemoreceptors. Furthermore, mean VO2,ap increased with increasing PO2,air, indicating that the observed increase in VO2/breath with increasing PO2,air was facilitated not only by an increase in apnoea duration but also by an increase in the air–blood PO2 gradient.

Key words: fish, respiration, air-breathing, bimodal gas exchange, aerial O2, air-breathing organ, O2 chemoreceptor


Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:


Home page
 Biol LettHome page
H. F. Vaca and C. R. White
Environmental modulation of metabolic allometry in ornate rainbowfish Rhadinocentrus ornatus
Biol Lett, September 23, 2009; (2009) rsbl.2009.0610v1.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 2007