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Effects of temperature acclimation and age on movement of Cryptolestes ferrugineus (Coleoptera: Laemophloeidae) adults in response to temperature gradients

Published online by Cambridge University Press:  02 April 2012

Fuji Jian ,
Digvir S. Jayas  and
Noel D.G. White
Fuji Jian
Affiliation:
Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba, Canada R3T 5V6
Digvir S. Jayas*
Affiliation:
Department of Biosystems Engineering, University of Manitoba, Winnipeg, Manitoba, Canada R3T 5V6
Noel D.G. White
Affiliation:
Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
*
1Corresponding author (e-mail: digvir_jayas@umanitoba.ca).
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Abstract

Adult Cryptolestes ferrugineus (Stephens) were reared at 30 °C or acclimated to 15, 25, or 35 °C for different periods (2 days or 1, 2, or 5 weeks). Populations 1 day old, 1, 5, 10, or 20 weeks old, or of mixed age were held in 10 cm × 10 cm × 100 cm wheat columns (14.5% ± 0.2% moisture content) with a temperature gradient (10 °C/m, 25–35 °C) or a constant temperature (25 or 30 °C) for 1, 6, or 12 days; movement and distribution were then determined. Acclimation to 25 °C for a short time (less than 2 days) did not influence adults' response to temperature in the wheat column. Adults acclimated to 15 and 35 °C responded differently to temperature in the wheat column, preferring temperatures above 30 and 35 °C, respectively. Increasing the duration of the acclimation to 15 or 35 °C resulted in higher aggregation. Acclimation temperature might be more important than exposure time for influencing insect behaviour. During their movement in the wheat columns, adults were also acclimated to the tested temperatures, and they did not always stay in a warmer area if the "cold" area was warmer than 25 °C. Adults that were 1 day old had a lower response (i.e., less movement) to temperature gradients than the older insects. Among the older insects, the response to temperature gradients did not decrease with increasing age, even at 20 weeks.

Résumé

Nous avons élevé des adultes de Cryptolestes ferrugineus (Stephens) à 30 °C, et en avons acclimatés d'autres à 15, 25 et 35 °C pour des périodes de 2 jours et de 1, 2 et 5 semaines. Nous avons gardé des populations âgées de 1 jour et de 1, 5, 10 et 20 semaines et des populations d'âges mixtes dans des colonnes de blé de 10 cm × 10 cm × 100 cm (14,5 % ± 0,2 % d'humidité) avec un gradient de température (10 °C/m, 25–35 °C) ou avec une température constante (25 ou 30 °C) pendant 1, 6 ou 12 jours; nous avons noté leurs déplacements et leur répartition. Une acclimatation à 25 °C pour une courte période (moins de 2 jours) n'affecte pas la réaction des adultes à la température dans la colonne de blé. Les adultes acclimatés à 15 et 35 °C réagissent différemment à la température dans la colonne de blé, les premiers préférant les températures supérieures à 30 °C et les seconds les températures supérieures à 35 °C. Une prolongation de l'acclimatation à 15 ou à 35 °C provoque des distributions plus contagieuses. La température d'acclimatation peut être plus importante que la durée de l'acclimatation pour expliquer le comportement des insectes. Pendant leurs déplacements dans la colonne de blé, les adultes s'acclimatent aussi aux températures expérimentales; ils ne demeurent pas toujours dans la zone plus chaude, si la zone plus « froide » a une température supérieure à 25 °C. Les adultes âgés de 1 jour ont une réaction moins forte (i.e., moins de déplacements) aux gradients thermiques que les insectes plus vieux. Chez les insectes plus âgés, la réaction aux gradients thermiques ne diminue pas avec l'âge, même à 20 semaines.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 1 , February 2005 , pp. 71 - 82
Copyright
Copyright © Entomological Society of Canada 2005

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