Water transport by the eversible abdominal vesicles of Petrobius brevistylis

摘要: Abstract The uptake of fluid by the eversible ventral abdominal sacs Petrobius brevistylis from a wet substrate is described. On lightly wetted filter paper insects do not drink, and an insect with initial fresh weight 15mg can regain 30% loss due to dehydration in 7 min when allowed access distilled water. A similar would need 39 become replete taking up 0.33 osmole kg−1 NaCl solution. length time taken water was related size amount loss. Between 15 sodium ions present each μl external solution entered mg increase were both dilute stronger Artificially everted anaesthetized absorbed contact or sucrose solutions that hyperosmotic blood. presence active transport mechanism for vesicles discussed.