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First published online February 6, 2004
Journal of Experimental Biology 207, 1017-1025 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00860

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Comparative water relations of four species of scorpions in Israel: evidence for phylogenetic differences

Eran Gefen^* and Amos Ar

Department of Zoology, Tel Aviv University, Ramat Aviv 69978, Israel

View larger version (23K): [in a new window]   Fig. 1. Haemolymph osmolarity change (mOsm l–1) after a 14-day period of ad libitum feeding, as a function of the deviation of haemolymph osmolarity of the individual scorpion from the initial sample mean (before feeding; mOsm l–1). For significance and regression equations, see text and Table 2.

View larger version (19K): [in a new window]   Fig. 2. Haemolymph osmolarity change (% of initial osmolarity) following desiccation, as a function of mass loss (% of initial mass, excluding dry excretions). (1) Buthotus judaicus: y=0.10x2–1.05x, r2=0.61; (2) Leiurus quinquestriatus, y=0.09x2–0.76x, r2=0.64; (3) Scorpio maurus fuscus: y=0.10x2+0.49x, r2=0.73; (4) Scorpio maurus palmatus: y=0.06x2+0.67x, r2=0.54.

View larger version (19K): [in a new window]   Fig. 3. Sum of sodium and chloride ion concentrations at increasing haemolymph osmotic concentrations following desiccation. The slope (0.95) of the solid line represents the initial fraction of sodium and chloride ions from total haemolymph osmolarity (for individuals included in this sample).

View larger version (19K): [in a new window]   Fig. 4. Daily mass-specific mass loss rates (mean ± S.E.M.) as a function of time from initiation of measurements at 30°C and 50%RH. Letters represent statistically significant differences (one-way ANOVA on mass-adjusted MLR; =0.05) between day 2 and between averaged days 8–14 MLR values. The filled area represents the estimated maximal dry-mass loss as a result of metabolism, based on carbohydrate catabolism and an oxygen consumption rate of 0.1 ml g–1 h–1 (see text).