First published online January 16, 2009
Journal of Experimental Biology 212, 429-434 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.022343
Water homeostasis in bees, with the emphasis on sociality
Susan W. Nicolson
Department of Zoology and Entomology, University of Pretoria, Pretoria
0002, South Africa

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Fig. 1. Female Allodapula variegata concentrating the dilute (14%) nectar
of Aloe arborescens by evaporation. The regurgitated droplet, held
under the tongue, is repeatedly sucked in and out and may be very large in
relation to the size of the bee (body length 7 mm). Photo, Michael Ellis.
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Fig. 2. Relative masses of sugar and water in nectars of various concentrations and
in honey (horizontal red line). The figure shows the nectar-processing
advantage for Apis mellifera scutellata workers concentrating the
nectar of Aloe greatheadii var. davyana from 20% to 40% on
their tongues: two-thirds of the necessary evaporation is achieved before the
bees return to the hive (Nicolson and
Human, 2008 ).
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Fig. 3. Honeybee abdomen showing full crop (A) or full rectum (B). Adapted from
plate 8 in Dade (Dade,
1962 ).
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© The Company of Biologists Ltd 2009