Gill tissue masses and oxygen consumption of Gobionotothen gibberifrons, Notothenia coriiceps and Zoarces viviparus ...

Mechanisms responsive to hypercapnia (elevated CO2 concentrations) and shaping branchial energy turnover were investigated in isolated perfused gills of two Antarctic Notothenioids (Gobionotothen gibberifrons, Notothenia coriiceps). Branchial oxygen consumption was measured under normo- versus hyper...

Full description

Bibliographic Details
Main Authors: Deigweiher, Katrin, Hirse, Timo, Bock, Christian, Lucassen, Magnus, Pörtner, Hans-Otto
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2010
Subjects:
AWI
Online Access:https://dx.doi.org/10.1594/pangaea.847064
https://doi.pangaea.de/10.1594/PANGAEA.847064
Description
Summary:Mechanisms responsive to hypercapnia (elevated CO2 concentrations) and shaping branchial energy turnover were investigated in isolated perfused gills of two Antarctic Notothenioids (Gobionotothen gibberifrons, Notothenia coriiceps). Branchial oxygen consumption was measured under normo- versus hypercapnic conditions (10,000 ppm CO2) at high extracellular pH values. The fractional costs of ion regulation, protein and RNA synthesis in the energy budgets were determined using specific inhibitors. Overall gill energy turnover was maintained under pH compensated hypercapnia in both Antarctic species as well as in a temperate zoarcid (Zoarces viviparus). However, fractional energy consumption by the examined processes rose drastically in G. gibberifrons (100-180%), and to a lesser extent in N. coriiceps gills (7-56%). In conclusion, high CO2 concentrations under conditions of compensated acidosis induce cost increments in epithelial processes, however, at maintained overall rates of branchial energy turnover. ... : Specimens of Gobionotothen were collected during an Antarctic summer expedition with RV POLARSTERN in 2006/07 (ANT-XXIII/8) from bottom trawls at depths of 60-490 m at the Antarctic Peninsula near Elephant and Joinville Island. Notothenia coriiceps were caught with fish traps at Jubany station (King-George-Island). Commom eelpout (Zoarces viviparus) were caught with bottom traps in the German bight near Helgoland in April 2004 and April 2005. ...