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SECONDARY EFFECTS OF CANOPY DIEBACK: THE EPIGEAL CARABID FAUNA IN QUÉBEC APPALACHIAN MAPLE FORESTS

Published online by Cambridge University Press:  31 May 2012

J. Martel
Affiliation:
Groupe de recherche en écologie forestière, Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succ. A, Montréal, Québec, Canada H3C 3P8
Y. Mauffette
Affiliation:
Groupe de recherche en écologie forestière, Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succ. A, Montréal, Québec, Canada H3C 3P8
S. Tousignant
Affiliation:
Groupe de recherche en écologie forestière, Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succ. A, Montréal, Québec, Canada H3C 3P8

Abstract

The impact of canopy dieback on the activity and diversity of epigeal Carabidae was studied during the summers of 1987 and 1988 in 18 maple stands in southeastern Québec, using pitfall traps. A canopy thinning index (CTI) based on severity and incidence of dieback, and on tree basal area was calculated for each of the 72 stations sampled. An analysis of variance shows that canopy dieback had a significant effect on carabid beetle activity in 1988. The CTI was negatively correlated with the carabid species richness and diversity in 1988. The number of individuals caught per station was negatively correlated with the CTI for all species combined, except for the dominant Pterostichus coracinus Newm. in 1988. These results indicate a negative response of carabid beetles to canopy dieback in 1988; the climate may have tempered the effects of dieback in 1987.

Résumé

Une étude de l’impact du dépérissement du couvert sur l’activité et la diversité de la faune carabique épigée a été réalisée au cours des étés 1987 et 1988 dans 18 érablières du sud-est du Québec avec l’aide de pièges-fosses. Un indice d’éclaircissage du couvert (IEC) basé sur la sévérité et l’incidence du dépérissement ainsi que la surface terrière des arbres a été calculé pour chacune des 72 stations échantillonnées. Une analyse de variance démontre que le dépérissement a eu un effet significatif sur l’activité des Carabidae en 1988. L’IEC était corrélé négativement avec la richesse et la diversité spécifique des Carabidae en 1988. Le nombre d’individus capturés par piège-fosse et l’IEC pour toutes les espèces combinées à l’exception de Pterostichus coracinus Newm., l’espèce dominante, étaient corrélés négativement en 1988. Ces résultats indiquent une réponse négative des Carabidae à l’éclaircissement du couvert en 1988 alors que le climat pourrait avoir tempéré les effets du dépérissement en 1987.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1991

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