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First published online April 18, 2008
Journal of Experimental Biology 211, 1475-1481 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.013268
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Sugars are complementary resources to ethanol in foods consumed by Egyptian fruit bats

Francisco Sánchez*, Burt P. Kotler, Carmi Korine and Berry Pinshow

Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, Israel


Figure 1
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  		Fig. 1. Changes in ethanol levels (relative values) in Egyptian fruit bat breath after they ingested mixtures containing 1% ethanol and fructose, sucrose or glucose. Ethanol in breath is equal to the integrated area under the peak of the retention time of ethanol, measured by gas chromatography. Ethanol levels were affected by the interaction of sugar type and time (RM-ANOVA, P<0.01). After 70 min, ethanol levels were significantly lower when bats ingested food+fructose than for either food+sucrose or food+glucose. Values at time 0 were recorded before the mixtures were administered. Error bars are 1 s.d. Different letters above the bars denote significant differences (contrasts with Bonferroni correction, P<0.05).

 

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  		Fig. 2. Effects of ethanol concentration on the marginal value of food containing fructose, sucrose or glucose for female (left panels) and male (right panels) Egyptian fruit bats. Marginal values were estimated using giving-up density (GUD). The difference between the GUD of the sugar-containing foods tested was significantly greater when the foods contained 1% ethanol than when they were ethanol free (one and two asterisks indicate significance at the P<0.05 and P<0.01 level, respectively). By increasing ethanol concentration in the food, the marginal value of food+fructose decreased relative to food+sucrose (A,B) and increased relative to food+glucose (C,D). The marginal value of food+sucrose increased relative to that of food+glucose with ethanol abundance (E,F). Error bars are 1 s.d.

 

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  		Fig. 3. Sugar preferences of female and male Egyptian fruit bats when food contained either 0% or 1% ethanol. Preferences are expressed as GUDSugar A/GUDSugar A+GUDSugar B. Values smaller than 0.5 denote preference for the sugar in the numerator (Sugar A). The filled circles are means, and the error bars are 95% confidence intervals. Means with error bars above or below the 0.5 line indicate significant differences (one-sample tests, P<0.05). Frc, fructose; Scr, sucrose; Glc, glucose.

 

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© The Company of Biologists Ltd 2008