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DEVELOPMENTAL TIMES AND FECUNDITY OF IXODES COOKEI PACKARD (ACARI: IXODIDAE) UNDER LABORATORY CONDITIONS

Published online by Cambridge University Press:  31 May 2012

Martha J. Farkas  and
Gordon A. Surgeoner
Martha J. Farkas
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Gordon A. Surgeoner
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

Ixodes cookei Packard required ca. 14 weeks to complete development under laboratory conditions, using groundhogs [Marmota monax (L.)] as the blood meal source and off-host conditions of 25–29°C and 93–100% relative humidity. All three post-embryonic instars engorged in ca. 6–8 days. Larvae and nymphs maintained at 25°C moulted to the next instar ca. 18–20 days after detachment. Moult occurred under conditions of either a 0L:24D or a 16L:8D photoperiod. Adult females increased in weight ca. 49-fold from the unfed to the engorged state, attaining a weight of 194.1 ± 15.0 (mean ± SE) mg and producing 1281.5 ± 139.1 (mean ± SE) eggs at 29°C. The pre-ovipositional and ovipositional periods were 4.7 ± 0.3 and 20.2 ± 1.7(mean ± SE) days, respectively, at 29°C. Fifty percent of eggs were deposited within the 1st week of the ovipositional period at 29°C. First egg hatch at 29°C occurred ca. 31 days after oviposition was started. Eggs maintained at 10°C did not hatch, and the thermal threshold for egg development was calculated to be 11.2°C.

Résumé

Ixodes cookei Packard a prix à peu près 14 semaines pour compléter le développement sous les conditions du laboratoire, quand les marmottes [Marmota monax (L.)] ont servi comme source de repas sanguins et quand les conditions hors hôte ont été de 25–29°C et de 93–100% humidité relative. Tous les trois stades post-embryonnaires se sont engorgés dans à peu près 6–8 jours. Les larves et les nymphes maintenues à 25°C ont mué au stade subséquent à peu près de 18–20 jours après avoir été enlevées. Les mues ont eu lieu sous les conditions d’une photopériode soit de 0L : 24N, soit de 16L : 8N. Les adultes du sexe féminin ont augmenté de poids ca. 49 fois à partir du stade non-nourri au stade engorgé, pour atteindre un poids de 194,1 ± 15,0 mg (moyenne ± ET) et pour produire 1281,5 ± 139,1 oeufs (moyenne ± ET) à 29°C. Les périodes de préponte et de ponte ont été 4,7 ± 0,3 et 20,2 ± 1,7 jours (moyenne ± ET), respectivement, à 29°C. Cinquante pourcent des oeufs ont été déposés en dedans de la première semaine de la période de ponte à 29°C. La première éclosion d’oeufs à 29°C a eu lieu à peu près 31 jours suivant le commencement de ta ponte. Les oeufs maintenus à 10°C n’ont pas éclos et le palier thermal pour le développement d’oeufs a été calculé comme 11,2°C.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 1 - 12
Copyright
Copyright © Entomological Society of Canada 1991

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