Hyperosmotic acclimation in the leech, Hirudo medicinalis L.: energy metabolism, osmotic, ionic and volume regulation.
1. Acclimation of Hirudo medicinalis L. to hyperosmotic medium (12/1000 salinity) is characterized by changes in energy metabolism. A transient succinate fermentation is followed by malate accumulation in the tissue from the control level of 41.4 +/- 7.6 to 82.8 +/- 15.4 mumol/g dry weight after 9 days. 2. Initial osmotic water loss of 40% is restored in the intravasal space by isosmotic volume regulation after 9 days, but restoration is incomplete in the tissue even after 6 weeks of acclimation. 3. Elevation of SCCA anions in the blood is a mechanism of chloride hyporegulation.
Nieczaj
R
R
Institut für Tierphysiologie, Freie Universität Berlin, F.R.G.
Zerbst-Boroffka
I
I
D000222:Adaptation, Physiological / Q000502:physiology*; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001834:Body Water / Q000378:metabolism; D002264:Carboxylic Acids / Q000378:metabolism; D002712:Chlorides / Q000097:blood / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004734:Energy Metabolism / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D007865:Leeches / Q000378:metabolism*; D009994:Osmolar Concentration; D012964:Sodium / Q000097:blood / Q000378:metabolism
D002264:Carboxylic Acids; D002712:Chlorides; D012964:Sodium