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FIRST RECORDS OF PHORETIC BEHAVIOUR OF TARSONEMUS ASCITUS DELFINADO (ACARINA: TARSONEMIDAE) ON GRAIN-INHABITING BEETLES AND ITS SPATIAL DISTRIBUTION ON CARTODERE CONSTRICTA (GYLLENHAL) (COLEOPTERA: LATHRIDIIDAE)1

Published online by Cambridge University Press:  31 May 2012

Philip S. Barker
Philip S. Barker
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

Adult female Tarsonemus ascitus Delfinado mites are recorded for the first time as phoretic on the grain-inhabiting lathridiid beetles Cartodere constricta (Gyllenhal) and Enicmus fictus Fall, and the rhizophagid beetle Monotoma picipes Herbst. The mites preferred to attach to the lateral and undersides of the prothorax of the beetles. The spatial distribution of T. ascitus on C. constricta in suction traps was determined as a guide to the numbers of beetles that would have to be collected to obtain reliable estimates of numbers of mites found per beetle. The mean numbers of mites per beetle was always smaller than the variance, and the spatial distribution of the mites followed a negative binomial distribution. The numbers of beetles required to be collected to provide a predetermined measure of the precision of the numbers of mites per beetle were calculated.

Résumé

Le comportement phorétique de femelles adultes de Tarsonemus ascitus Delfinado a été constaté pour la première fois chez des coléoptères des céréales, les lathridies Cartodere constricta (Gyllenhal) et Enicmus fictus Fall et le rhizophage Monotoma picipes Herbst. Les acariens se fixent surtout aux parois latérales et inférieures du prothorax des coléoptères. La répartition spatiale de T. ascitus sur des C. constricta dans des pièges à succion a servi de modèle pour déterminer le nombre de coléoptères nécessaires à une estimation fiable du nombre d’acariens par coléoptère. Le nombre moyen d’acariens par coléoptère était toujours inférieur à la variance et leur répartition spatiale correspondait à une distribution binomiale négative. Le nombre de coléoptères nécessaire pour obtenir une mesure prédéterminée de la précision du nombre d’acariens par coléoptère a été calculé.

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Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 5 , October 1991 , pp. 1077 - 1081
Copyright
Copyright © Entomological Society of Canada 1991

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