Temperature effects on locomotor activity rates of sub-Antarctic oribatid mites

David J. Marshall, Steven L. Chown

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The influence of temperature on locomotor activity was determined for the sub-Antarctic mites, Halozetes fulvus Engelbrecht and Podacarus auberti Grandjean. In both species walking was severely impaired at below-freezing temperatures. Above zero, locomotor activity rates increased with a rise in temperature over a wide temperature range (for example, this was 2-30°C for H. fulvus), and they showed a biologically normal level of sensitivity to change in temperature. All the calculated Q10 values for mean rates over 5° intervals varied between 1.3 and 2.9. The present data are compared with some rate functions of maritime and continental Antarctic micro-arthropods, and they confirm the relative enhancement of the physiological rate by a continental Antarctic mite. One explanation for the less temperature-sensitive rates in H. fulvus and P. auberti may be that they have relatively more time available for normal biological activity.

Original languageEnglish
Pages (from-to)47-49
Number of pages3
JournalPolar Biology
Issue number1
Publication statusPublished - 1 Jan 1995
Externally publishedYes

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