The copyright line for this article was changed on 21 July 2015 after original online publication.
Thermal thresholds of the predatory mite Balaustium hernandezi
Article first published online: 14 MAY 2014
© 2014 The Authors. Physiological Entomology published by John Wiley & Sons Ltd on behalf of Royal Entomological Society
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Volume 39, Issue 2, pages 120–126, June 2014
How to Cite
Coombs, M. R. and Bale, J. S. (2014), Thermal thresholds of the predatory mite Balaustium hernandezi. Physiological Entomology, 39: 120–126. doi: 10.1111/phen.12055
- Issue published online: 14 MAY 2014
- Article first published online: 14 MAY 2014
- Manuscript Accepted: 24 FEB 2014
- Manuscript Revised: 26 JAN 2014
- Manuscript Received: 25 NOV 2013
- U.K. Biotechnology and Biological Sciences Research Council (BBSRC)
- Balaustium hernandezi;
- biological control;
- chill coma;
- heat coma
The lower and upper thermal activity thresholds of adult and larval Balaustium hernandezi von Heyden (Acari: Erythraeidae) are compared with those of its prey Tetranychus urticae Koch (Acari: Tetranychidae). Adult female B. hernandezi retain ambulatory function (CTmin) and movement of appendages (chill coma) at significantly lower temperatures (5.9 and −2.1 °C, respectively) than those of larval B. hernandezi (8.1 and −1.7 °C) and T. urticae (10.6 and 10.3 °C). There is no significant difference between the temperature at which adult and larval B. hernandezi and T. urticae cease walking as the temperature is raised (CTmax) (46.7, 46.3 and 47.3 °C, respectively). However, both life stages of B. hernandezi cease movement (heat coma) below the upper locomotory limits of T. urticae (46.8, 46.7 and 48.7 °C, respectively). Adult B. hernandezi have significantly faster walking speeds than larvae and T. urticae across a range of temperatures. The lower thermal activity threshold data indicate that B. hernandezi would make an effective biological control agent in temperate climates; however, the extent of the low temperature tolerances of the species suggests the potential to establish in a northern European climate.