Transepithelial potential in the Magadi tilapia, a fish living in extreme alkalinity

Transepithelial potential in the Magadi tilapia, a fish living in extreme alkalinity

We investigated the transepithelial potential (TEP) and its responses to changes in the external medium in Alcolapia grahami , a small cichlid fish living in Lake Magadi, Kenya. Magadi water is extremely alkaline (pH = 9.92) and otherwise unusual: titratable alkalinity (290 mequiv L −1 , i.e. HCO 3...

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Veröffentlicht in:Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology Biochemical, systemic, and environmental physiology, 2012-02, Vol.182 (2), p.247-258
Hauptverfasser: Wood, Chris M., Bergman, Harold L., Bianchini, Adalto, Laurent, Pierre, Maina, John, Johannsson, Ora E., Bianchini, Lucas F., Chevalier, Claudine, Kavembe, Geraldine D., Papah, Michael B., Ojoo, Rodi O.
Format: Artikel
Sprache:eng
Schlagworte:
Adaptation, Biological - physiology
Alcolapia grahami
Alkalinity
Analysis of Variance
Animal Physiology
Animals
Anions
Biochemistry
Biomedical and Life Sciences
Biomedicine
Cichlidae
Electrochemistry
Environment
Extreme cold
Fish
Fisheries
Freshwater
Human Physiology
Hydrogen-Ion Concentration
Kenya
Lakes - chemistry
Life Sciences
Membrane Potentials - physiology
Models, Biological
Nitrates - metabolism
Original Paper
Permeability
Physiology
Sodium Bicarbonate - metabolism
Sodium chloride
Sodium Chloride - metabolism
Temperature
Tilapia
Tilapia - physiology
Zoology
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Beschreibung
Zusammenfassung:We investigated the transepithelial potential (TEP) and its responses to changes in the external medium in Alcolapia grahami , a small cichlid fish living in Lake Magadi, Kenya. Magadi water is extremely alkaline (pH = 9.92) and otherwise unusual: titratable alkalinity (290 mequiv L −1 , i.e. HCO 3 − and CO 3 2− ) rather than Cl − (112 mmol L −1 ) represents the major anion matching Na +  = 356 mmol L −1 , with very low concentrations of Ca 2+ and Mg 2+ (
ISSN:0174-1578
1432-136X
DOI:10.1007/s00360-011-0614-y