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Phloem and xylem nitrogen variability in Quercus rubra attacked by Enaphalodes rufulus

Published online by Cambridge University Press:  03 January 2012

Laurel J. Haavik ,
Matthew P. Ayres ,
Erik E. Stange  and
Fred M. Stephen
Laurel J. Haavik*
Affiliation:
Department of Entomology, University of Arkansas, 319 Agriculture, Fayetteville, Arkansas 72701, United States of America
Matthew P. Ayres
Affiliation:
Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, United States of America
Erik E. Stange
Affiliation:
Norwegian Institute for Nature Research, Fakkelgården, NO-2624 Lillehammer, Norway
Fred M. Stephen
Affiliation:
Department of Entomology, University of Arkansas, 319 Agriculture, Fayetteville, Arkansas 72701, United States of America
*
2Corresponding author (e-mail: ljhaavik@ucdavis.edu).
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Abstract

We analyzed nitrogen (N) content in phloem and xylem of 75 northern red oak, Quercus rubra L. (Fagaceae), removed in 2002–2007 from three sites within the Ozark National Forest, Arkansas, to investigate the relationship between vascular tissue N status and wood borer infestation. Populations of native red oak borer, Enaphalodes rufulus (Haldeman) (Coleoptera: Cerambycidae), experienced an outbreak and population crash during the sampling period. Vascular tissue N was not correlated with borer infestation density (exit holes/m−2/bark surface), which suggests variation in N status of vascular tissue was not influenced by or did not influence borer success. Vascular tissue N was greater in trees sampled during winter months than in trees sampled in spring and summer months.

Résumé

Nous avons analysé le contenu en azote (N) du phloème et du xylème de 75 chênes rouges boréaux, Quercus rubra L. (Fagaceae), prélevés en 2002–2007 dans trois sites de la forêt nationale d'Ozark, Arkansas, afin d'examiner la relation entre le N du tissu vasculaire et l'infestation par les insectes mineurs du bois. Durant la période d'échantillonnage, les populations du grand longicorne du chêne rouge, Enaphalodes rufulus (Haldeman) (Coleoptera : Cerambycidae), un insecte indigène, ont connu une épidémie et un effondrement. Il n'y a pas de corrélation entre le N du tissu vasculaire et la densité de l'infestation des mineuses (nombre de trous de sortie m-2 de surface d'écorce), ce qui laisse croire que le statut en N du tissu vasculaire n'est pas influencé par le succès des mineuses, ni ne l'influence. Les concentrations de N du tissu vasculaire sont plus élevées dans les arbres prélevés durant les mois d'hiver que durant les mois de printemps et d'été.

[Traduit par la Rédaction]

Type
Behavior & Ecology
Information
The Canadian Entomologist , Volume 143 , Issue 4 , August 2011 , pp. 380 - 383
Copyright
Copyright © Entomological Society of Canada 2011

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