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Effects of experimental harvesting on spider (Araneae) assemblages in boreal deciduous forests1

Published online by Cambridge University Press:  02 April 2012

Christopher M. Buddle  and
David P. Shorthouse
Christopher M. Buddle*
Affiliation:
Department of Natural Resource Sciences, McGill University, Macdonald Campus, 21,111 Lakeshore Road, Sainte-Anne-de-Bellevue, Quebec, Canada H9X 3V9
David P. Shorthouse
Affiliation:
Department of Biological Sciences, CW-405A Biological Sciences Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2E9
*
2Corresponding author (e-mail: chris.buddle@mcgill.ca).
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Abstract

Two large-scale forestry experiments, in Quebec (Sylviculture et aménagement forestiers écosystémique (SAFE)) and Alberta (Ecosystem Management by Emulating Natural Disturbance (EMEND)), were established in the late 1990s to test the effects of alternative silvicultural strategies (e.g., partial cutting) on biodiversity in northern boreal forests. We collected spiders in pitfall traps 2 years after the application of partial-cutting treatments in deciduous stands at EMEND and 6 years after similar treatments in deciduous stands at SAFE. Although we are aware of the challenges imposed by disparate locations and whole-scale experimental methods, our objective was to compare the effects of partial cutting on spider assemblages (diversity and community composition), and in doing so, to formulate a few general statements. Overall, 98 species (6107 individuals) were collected from Alberta and 86 species (3414 individuals) from Quebec. Of these, 44 species were common to both regions. Ordination and indicator-species analyses revealed a distinct effect of geographic separation: the spider assemblages in deciduous stands within the boreal plains ecoregion of Alberta and the boreal shield in Quebec were distinct. However, the effects of partial cutting on spider assemblages within each project were similar: removal of 25%–33% of trees shifted a characteristic old-growth fauna toward one more typical of clearcuts. Indicator-species analysis also revealed the dominance of wolf spider (Lycosidae) species in clearcuts within both experiments and we present evidence that clear-cutting homogenizes spider assemblages. Old-growth forests contain spider faunas that are easily disrupted by moderate partial cutting. In the face of intense harvesting practices, managing for the maintenance of biodiversity and conservation of spider faunas in northern forests will require retention of old-growth forests.

Résumé

Deux expériences forestières à grande échelle, au Québec (Sylviculture et aménagement forestier écosystémiques (SAFE)) et en Alberta (Ecosystem Management by Emulating Natural Disturbance (EMEND)), mises en branle à la fin des années 1990 cherchent à vérifier les effets de pratiques de sylviculture de rechange (c’est-à-dire, des coupes partielles) sur la biodiversité des forêts boréales nordiques. Nous avons récolté des araignées dans des pièges à fosse 2 ans après un traitement par coupe partielle dans des peuplements décidus dans le cadre d’EMEND et 6 ans après un traitement semblable dans des peuplements décidus dans le cadre de SAFE. Tout en étant conscients des problèmes générés par ces sites disparates et des méthodes expérimentales à grande échelle, notre objectif est de comparer les effets de la coupe partielle sur les communautés d’araignées (diversité et composition) et, par là, arriver à quelques conclusions générales. Globalement, nous avons récolté 98 espèces (6107 individus) en Alberta et 86 espèces (3414 individus) au Québec; de celles-ci, 44 espèces sont communes aux deux régions. Des ordinations et des analyses d’espèces indicatrices indiquent un net effet de la distance géographique: les communautés d’araignées des peuplements décidus dans l’écorégion des plaines boréales de l’Alberta et dans le bouclier laurentien boréal du Québec sont distinctes. Cependant, les effets de la coupe partielle sur les communautés d’araignées dans chacun des deux projets sont semblables: un retrait de 25 % – 33 % des arbres entraîne un remplacement de la faune typique des forêts anciennes par une faune plus caractéristique des zones de coupe à blanc. L’analyse des espèces indicatrices montre aussi une dominance des espèces d’araignées-loups (Lycosidae) dans les zones de coupe à blanc dans les deux expériences; nous présentons des preuves que la coupe à blanc tend à homogénéiser les communautés d’araignées. Les forêts anciennes contiennent des faunes d’araignées qui sont facilement perturbées par une coupe partielle modérée. Lors de l’utilization de méthodes de coupe à forte intensité, il sera nécessaire de préserver des forêts anciennes pour permettre un aménagement qui favorise le maintien de la diversité et la conservation des faunes d’araignées.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 4: Maintaining Arthropods in Northern Forest Ecosystems: Symposium Proceedings / Actes du symposium: Maintien des arthropodes dans les écosystèmes forestiers nordiques , August 2008 , pp. 437 - 452
Copyright
Copyright © Entomological Society of Canada 2008

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