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...

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Bibliographic Details
Main Authors: Deigweiher, Katrin, Hirse, Timo, Bock, Christian, Lucassen, Magnus, Pörtner, Hans-Otto
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
AWI
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
SPP1158
Antarctic
Arctic
Antarc*
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.847064
https://doi.org/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.

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