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SHORT COMMUNICATION Cold-hardiness in the wolf spider Pardosa groenlandica (Thorell)

Cold-hardiness in the wolf spider Pardosa groenlandica (Thorell)
with respect to thermal limits and dehydration
Jonathan Murphy, Tatiana Rossolimo and Sina Adl1
: Department of Biology, Dalhousie University, 1355 Oxford St.,
Halifax, Nova Scotia, B3H 4J1, Canada
Abstract. The super-cooling point (SCP) of Pardosa groenlandica was found to be 210.54u C, which is lower than for
species from warmer climates, in agreement with predictions. There was no significant difference found between sexes.
There were also no significant differences between the seasons, although there was a slight trend towards lower SCP
temperatures in the winter months. Dehydration lowered SCP in P. groenlandica, with a mean depression of over 3u C in
desiccated individuals. Specimens of P. groenlandica were able to move at temperatures as low as 22.3u C. These data allow
for comparisons with samples from other climatic regions, and reinforce predictions based on previous studies with a
variety of arthropods, regarding the effects of hunger and desiccation on the SCP.
Keywords: Arachnida, cold tolerance, Lycosidae, sub-arctic, super-cooling
Arthropods that live in sub-zero temperatures for at least part of
the year survive by one of two physiological and biochemical
responses. At least for insects (Bale 2002), one way is tolerance of
ice crystal formation in their bodies (freeze tolerance), and the other is
avoidance of ice crystal formation (freeze avoidance). Ice crystal
formation is avoided by super-cooling, which depresses the freezing


Source: Adl, Sina - Department of Biology, Dalhousie University


Collections: Environmental Sciences and Ecology