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COLD HARDINESS OF PHYTOSEIULUS PERSIMILIS ATHIAS-HENRIOT AND AMBLYSEIUS CUCUMERIS (OUDEMANS) (ACARINA: PHYTOSEIIDAE)

Published online by Cambridge University Press:  31 May 2012

W.D. Morewood
W.D. Morewood
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2
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Abstract

Aspects of cold hardiness of Phytoseiulus persimilis Athias-Henriot and Amblyseius cucumeris (Oudemans) were compared. Mean supercooling points (SCPs) ranged from −19.4 to −27.1°C and increased during development from egg to adult. Feeding status, diapause, and low temperature acclimation had little or no effect on supercooling capacity. Temperature/mortality curves confirmed that both species, including A. cucumeris in diapause, are freezing intolerant in the sense that the SCP represents the absolute limit to low temperature survival. However, the mites survived exposure to −12.5°C for less than 90 min. The results suggest that the SCP is directly related to body mass in these mites and that their ability to supercool is primarily a physical characteristic rather than an adaptation for survival of exposure to subzero temperatures.

Résumé

Certains aspects de la résistance au froid ont été étudiés chez Phytoseiulus persimilis Athias-Henriot et Amblyseius cucumeris (Oudemans). Le point de surfusion moyen (SCP) se situait entre −19,4 et −27,1°C et augmentait au cours du développement du stade oeuf au stade adulte. La condition alimentaire, la diapause ou l’acclimatation à une température froide avaient peu d’effet sur la capacité de surfusion ou n’en avaient pas du tout. Les courbes température/mortalité ont confirmé que l’une et l’autre espèces, même A. cucumeris pendant la diapause, sont intolérantes au gel dans la mesure où le point de surfusion représente la limite absolue de survie à des températures froides. Cependant, les acariens ont survécu à une exposition de moins de 90 min à −12,5°C. Ces résultats indiquent que le point de surfusion est directement relié à la masse corporelle chez ces acariens et que leur capacité de surfusion est avant tout une propriété physique plutôt qu’une adaptation qui permette aux animaux de survivre à des températures sous zéro.

[Traduit par la réduction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 6 , December 1992 , pp. 1015 - 1025
Copyright
Copyright © Entomological Society of Canada 1992

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