Volume 24, Issue 4 p. 476-486
Original Article

Phylogenetic community structure and stable isotope analysis of the parasitoid community associated with Eastern spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae)

Christopher J. Greyson-Gaito

Corresponding Author

Christopher J. Greyson-Gaito

Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada

Correspondence

Christopher J. Greyson-Gaito, Department of Integrative Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada.

Email: [email protected]

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Sarah J. Dolson

Sarah J. Dolson

Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada

Department of Biology, University of Ottawa, Ottawa, Ontario, Canada

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Glen Forbes

Glen Forbes

Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Fredericton, New Brunswick, Canada

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Rosanna Lamb

Rosanna Lamb

Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Fredericton, New Brunswick, Canada

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Wayne E. MacKinnon

Wayne E. MacKinnon

Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Fredericton, New Brunswick, Canada

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Kevin S. McCann

Kevin S. McCann

Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada

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M. Alex Smith

M. Alex Smith

Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada

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Eldon S. Eveleigh

Eldon S. Eveleigh

Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Fredericton, New Brunswick, Canada

Population Ecology Group, Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada

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First published: 10 May 2022

Funding information: C. J. Greyson-Gaito was supported by an Ontario Graduate Scholarship, by a Natural Sciences and Engineering Research Council of Canada (NSERC) CGS-D and by a Royal Canadian Geographical Society James Bourque Research Grant. Financial support was provided by the Canadian Forest Service to E.S. Eveleigh, by NSERC to K. S. McCann and M. A. Smith, and by the Atlantic Canada Opportunities Agency to M. A. Smith and E. S. Eveleigh.

Abstract

  1. Eastern spruce budworm, Choristoneura fumiferana Clemens (Lepidoptera: Tortricidae), is a major pest of eastern North American forests. Outbreaks of spruce budworm occur every 30–40 years, causing high tree mortality.
  2. Researchers have established that higher proportions of hardwood trees within stands (higher hardwood content) may reduce the defoliation and mortality of balsam fir and spruces during spruce budworm outbreaks. One mechanism posited to explain these patterns is that hardwood trees positively impact the parasitoids of spruce budworm. Indeed, parasitism of spruce budworm by parasitoids has been found to be impacted by hardwood content. However, more research is needed to understand how hardwood content impacts the parasitoid community as a whole.
  3. In this study, we trialled the use of two analyses, phylogenetic community structure and stable isotope analysis, to examine how hardwood content influenced the parasitoid community associated with spruce budworm.
  4. We found that phylogenetic community structure differed between forest stands with different hardwood content. Furthermore, the trophic relationships between several parasitoids and caterpillars on balsam fir or hardwood trees changed within and between years.
  5. Our study highlights the potential of these two analyses for understanding how hardwood content influences the parasitoid community associated with spruce budworm.

DATA AVAILABILITY STATEMENT

All sequences and photographs are publically available on BOLD. All data and code (v3.0) to reproduce the reported results are publicly available on GitHub and have been archived on Zenodo.