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INDIVIDUAL VARIABILITY OF THE FLIGHT POTENTIAL OF IPS SEXDENTATUS BOERN. (COLEOPTERA: SCOLYTIDAE) IN RELATION TO DAY OF EMERGENCE, SEX, SIZE, AND LIPID CONTENT

Published online by Cambridge University Press:  31 May 2012

Hervé Jactel
Hervé Jactel
Affiliation:
I.N.R.A., Laboratoire d'Entomologie Forestière, Station de Recherches forestières, Pierroton, 33610 Cestas, France
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Abstract

Individual variability in the flight potential of Ips sexdentatus Boern. was investigated using flight mill experiments. Non-flyer status and flight durations were studied in relation to day of emergence, sex, pronotum width, dried body weight (after lipid ether extraction), and lipid content estimate. Lipid content estimation was determined in beetles reared on the same trees and under identical conditions as the flight test insects.The four flight-tested cohorts showed that approximately one-third were non-flyers. The distribution of individual flight durations was described by a log-normal curve. Consequently, the dispersal variability within the population could be fitted to a linear model on a log-probit scale. The concept of FD50 (flight duration 50), defined as the flight duration of 50% of a sample population, was used to describe population flight potential.There was no significant correlation between the individual flight duration and the day of emergence, sex, body size or weight, or lipid content estimate. A significant positive correlation was recorded between the different classes of flyer (i.e. non-, short, long, and very long flyers) and the average lipid content estimate. It was hypothesized that (1) a minimum threshold fuel supply was necessary to initiate the dispersal flight and (2) fuel supply could result in dispersal tendencies representing a specific response to habitat constraints.

Résumé

La variabilité individuelle du potentiel de vol de Ips sexdentatus Boern. est analysée au laboratoire en utilisant des manèges de vol. L’incapacité de vol et la durée de vol sont étudiées en fonction du jour d’émergence, du sexe, de la largeur du pronotum, du poids sec (après extraction des lipides à l’éther) et d’une estimation de la teneur en lipides des insectes.Environ un tiers des insectes testés sur manège se sont révélés incapables de voler. La distribution des durées de vol des individus d’une même population suit une loi log normale. Elle peut être décrite par un modèle linéaire en coordonnées log-probit. Le concept de DV50 (durée de vol 50), défini comme la durée de vol pouvant être accomplie par 50% de la population, est alors utilisé pour décrire le potentiel de vol de cette population.Aucune corrélation significative n’a pu être établie entre la durée de vol d’un individu et son jour d’émergence, son sexe, sa taille, son poids ou sa teneur en lipide. Regroupés en quatre classes de durée de vol (durée nulle, courte, longue et très longue), les scolytides présentent en moyenne des teneurs en lipides significativement différentes. Une quantité minimum de réserves énergétiques serait donc nécessaire pour initier le vol de dispersion et l’importance de ces réserves déterminerait l’ampleur du potentiel de déplacement.

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 5 , October 1993 , pp. 919 - 930
Copyright
Copyright © Entomological Society of Canada 1993

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