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First published online May 5, 2005
Journal of Experimental Biology 208, 1887-1894 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01568
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The effect of desiccation on water management and compartmentalisation in scorpions: the hepatopancreas as a water reservoir

Eran Gefen* and Amos Ar

Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel

* Author for correspondence (e-mail: gefene{at}unlv.nevada.edu)

Accepted 1 March 2005

Scorpions of the Family Buthidae have lower water loss rates (WLR) and enhanced osmoregulatory capacities in comparison with sympatric species of F. Scorpionidae. In this study we followed changes in water content of different body compartments in four scorpion species under prolonged desiccation conditions. The high initial WLR previously reported for Scorpionidae result in rapid depletion of body water stores. A significant decrease in total body water content of Scorpionidae was recorded following loss of only 5% of initial mass, whereas no such decrease was recorded for Buthidae following severe desiccation. When desiccated, scorpions lose water primarily from the hepatopancreas, while haemolymph volume is more tightly regulated. However, the haemolymph volume of Scorpionidae decreases as a result of depletion of hepatopancreas water stores following severe desiccation. The increasing lipid fraction in the hepatopancreas of Scorpionidae during desiccation suggests that depletion of body water stores may induce enhanced catabolism of carbohydrates, which may contribute to volume regulation by making initially glycogen-bound water available to the desiccating scorpion.

Key words: scorpion, water, desiccation, hepatopancreas, haemolymph, adaptation, osmoregulation






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