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Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism
Jacob T Smigel1, Allen G Gibbs
1College of Osteopathic Medicine, Midwestern University, 19555 North 59th Ave, Glendale, Arizona 85308, USA. jacob.smigel@azwebmail.midwestern.edu
Abstract:
Water balance of the terrestrial isopod, Armadillidium vulgare, was investigated during conglobation (rolling-up behavior). Water loss and metabolic rates were measured at 18 +/- 1 degrees C in dry air using flow-through respirometry. Water-loss rates decreased 34.8% when specimens were in their conglobated form, while CO2 release decreased by 37.1%. Water loss was also measured gravimetrically at humidities ranging from 6 to 75 %RH. Conglobation was associated with a decrease in water-loss rates up to 53 %RH, but no significant differences were observed at higher humidities. Our findings suggest that conglobation behavior may help to conserve water, in addition to its demonstrated role in protection from predation.
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