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VARIATION IN FEMALE SOUTHERN PINE BEETLE SIZE AND LIPID CONTENT IN RELATION TO FUNGAL ASSOCIATES

Published online by Cambridge University Press:  31 May 2012

Bryan R. Coppedge ,
Frederick M. Stephen  and
Gary W. Felton
Bryan R. Coppedge
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas, USA 72701
Frederick M. Stephen
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas, USA 72701
Gary W. Felton
Affiliation:
Department of Entomology, University of Arkansas, Fayetteville, Arkansas, USA 72701
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Abstract

Female southern pine beetles, Dendroctonus frontalis Zimmermann, may propagate two species of symbiotic fungi in a prothoracic mycangium. Females can carry either Ceratocystiopsis ranaculosus Bridges and Perry or an unnamed basidiomycete or both; some carry no fungi. Thus, females can be categorized into one of four groups based on mycangial content. We examined size and lipid content of emerging brood adult females based on these mycangial fungal classes. Female beetles carrying the basidiomycete, either alone or in combination with C. ranaculosus, were larger, heavier, and contained more lipid than did females carrying only C. ranaculosus. Size and lipid content also varied by season, as did the number of females carrying different fungal combinations. Regression analysis showed that variation in the occurrence of the basidiomycete was significantly related to variation in averages of beetle size and lipid content measurements.

Résumé

Les femelles du Dendroctone méridional du pin, Dendroctonus frontalis Zimmermann, peuvent transmettre deux espèces de champignons symbiontes dans un mycangium prothoracique. Les femelles peuvent être porteuses de Ceratocystiopsis ranaculosus Bridges et Perry ou d’un basidiomycète encore sans nom, ou peuvent porter les deux; certaines ne portent aucun champignon. Les femelles peuvent donc être assignées à l’une ou l’autre de quatre classes selon le contenu du mycangium. Nous avons étudié la taille et le contenu lipidique de femelles adultes à l’émergence en fonction de leur appartenance à l’une de ces classes. Les femelles porteuses du basidiomycète, seul ou combiné à C. ranaculosus, se sont avérées plus grosses, plus lourdes et plus riches en lipides que les femelles porteuses de C. ranaculosus seul. La taille et le contenu lipidique des femelles variaient en fonction de la saison et le nombre de femelles porteuses d’infections fongiques variait aussi selon la saison. Une analyse de régression a démontré que la variation dans la présence du basidiomycète était en corrélation significative avec la variation des valeurs moyennes de la taille et du contenu lipidique des coléoptères.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 2 , April 1995 , pp. 145 - 154
Copyright
Copyright © Entomological Society of Canada 1995

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