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Fluorescent powder marking reduces condition but not survivorship in adult mountain pine beetles

Published online by Cambridge University Press:  02 April 2012

Tyler G. Reid  and
Mary L. Reid
Tyler G. Reid
Affiliation:
Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4
Mary L. Reid*
Affiliation:
Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4
*
1Corresponding author (e-mail: [email protected]).
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Abstract

We investigated the impact of different fluorescent marking powders on both survivorship and daily body condition, measured as mass/volume ratio, using adult mountain pine beetles, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae: Scolytinae), in a laboratory study. Initial condition of the marked beetle groups did not differ from that of an unmarked group. However, beetles in better initial condition survived longer, thus validating our condition index. The condition but not the survivorship of mountain pine beetles was affected by the marking treatment. Overall, the condition of beetles declined over time. The condition of marked beetles decreased at a higher rate than that of unmarked beetles while alive but at a lower rate after death. This pattern of decreasing condition suggests that marked beetles lost water faster than unmarked beetles while alive, so unmarked beetles had more water to lose after death. Because reduced condition may affect optimal dispersal behaviour, we suggest that these effects be routinely examined and minimized in mark-recapture studies.

Résumé

Nous avons étudié l’impact de poudres fluorescentes de marquage sur la survie et sur la condition journalière, mesurée par le rapport masse/volume (mg/mm3), dans une étude en laboratoire de dendroctones du pin ponderosa, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae: Scolytinae). La condition initiale des coléoptères est semblable dans les groupes marqués et non marqués. Cependant, les coléoptères en meilleure condition initiale survivent plus longtemps, ce qui confirme la validité de notre indice de condition. Le marquage affecte la condition, mais non la survie, des dendroctones du pin ponderosa. Globalement, la condition des coléoptères diminue avec le temps. La condition des coléoptères marqués décline plus rapidement que celle des coléoptères non marqués durant leur vie; après la mort, leur taux de déclin est plus lent. Ce patron de déclin de la condition laisse croire que les coléoptères marqués perdent de l’eau plus rapidement que les non marqués durant leur vie, si bien qu’après la mort, les coléoptères non marqués ont plus d’eau à perdre. Parce qu’une condition inférieure peut affecter le comportement optimal de dispersion, nous suggérons d’examiner systématiquement ces effets et de les minimiser dans les études de marquage et de recapture.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 5 , October 2008 , pp. 582 - 588
Copyright
Copyright © Entomological Society of Canada 2008

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