Temperature and the hygropreference of the Arctic Collembolan Onychiurus arcticus and mite Lauroppia translamellata

Hayward, S.A.L.; Worland, M.R.; Bale, J.S.; Convey, P.. 2000 Temperature and the hygropreference of the Arctic Collembolan Onychiurus arcticus and mite Lauroppia translamellata. Physiological Entomology, 25 (3). 266-272. 10.1046/j.1365-3032.2000.00191.x

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The hygropreference of adult Onychiurus arcticus (Tullberg) was investigated over 2 h at 0, 10 and 20°C, along humidity gradients (12–98% RH) established using different salt solutions. At all temperatures O. arcticus preferred the highest humidity (98% RH). At 0 and 20°C, saturated conditions were preferred to 98% RH. The hygropreference of the mite Lauroppia translamellata (Willmann) was also assessed at 20°C, and no clear RH preference was observed. This species survived the loss of 24.9 ± 2.1% of its initial water content when held for 24 h at 20°C and 12% RH. A range of assays designed to eliminate the influence of thigmotactic behaviour and population clumping permit exclusion of these factors as being responsible for the observed results. The mean initial water content of O. arcticus samples (71.7 ± 10.9, 73.4 ± 4.0 and 73.8 ± 23.5% at 0, 10 and 20°C, respectively) did not differ significantly between temperatures, indicating that the results were not influenced by differences in initial hydrated state. The percentage water loss of individuals within the gradient increased with temperature, and differed significantly between regimes. The ecological significance of the observed humidity preferences are discussed.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1046/j.1365-3032.2000.00191.x
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0307-6962
Additional Keywords: Arctic, Collembola, dispersal, mite, relative humidity, temperature
Date made live: 27 Nov 2012 10:47 +0 (UTC)

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