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Desiccation Tolerance of the Barnacle Semibalanus Balanoides (L.) in Relation To Shore Height (Cirripedia, Thoracica)

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[The desiccation tolerance of the barnacle Semibalanus balanoides was investigated in the laboratory. Barnacles were collected from three levels (approximately MLWN, MTL and MHWN) on a shore in the Isle of Man, and the median lethal time under conditions of 20°C and 15% RH determined. For barnacles of the same opercular diameter the median lethal time was significantly longer at higher shore levels. Compared with low-shore barnacles the median lethal time was approximately 40% longer for mid-shore and 70% longer for high-shore barnacles. The relationship between water content and opercular diameter was examined, and barnacles from the three shore levels showed no differences. Therefore it is thought probable that the difference in desiccation tolerance is due either to differences in behaviour affecting rate of water loss, or differences in tolerance of water loss., The desiccation tolerance of the barnacle Semibalanus balanoides was investigated in the laboratory. Barnacles were collected from three levels (approximately MLWN, MTL and MHWN) on a shore in the Isle of Man, and the median lethal time under conditions of 20°C and 15% RH determined. For barnacles of the same opercular diameter the median lethal time was significantly longer at higher shore levels. Compared with low-shore barnacles the median lethal time was approximately 40% longer for mid-shore and 70% longer for high-shore barnacles. The relationship between water content and opercular diameter was examined, and barnacles from the three shore levels showed no differences. Therefore it is thought probable that the difference in desiccation tolerance is due either to differences in behaviour affecting rate of water loss, or differences in tolerance of water loss.]

Affiliations: 1: Port Erin Marine Laboratory, University of Liverpool, Port Erin, Isle of Man IM9 6JA, British Isles

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