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Two-dimensional wavelet analysis of spruce budworm host basal area in the Border Lakes landscape
Ecological Applications (2011)
  • Patrick M. A. James, University of Toronto
  • Brian R. Sturtevant, United States Forest Service
  • Phil Townsend, University of Wisconsin
  • Pete Wolter, University of Wisconsin
  • Marie-Josee Fortin, University of Toronto
Abstract
Increases in the extent and severity of spruce budworm (Choristoneura fumiferana Clem.) outbreaks over the last century are thought to be the result of changes in forest structure due to forest management. A corollary of this hypothesis is that manipulations of forest structure and composition can be used to reduce future forest vulnerability. However, to what extent historical forest management has influenced current spatial patterns of spruce budworm host species is unknown. To identify landscape-scale spatial legacies of forest management in patterns of spruce budworm host species (i.e., Abies balsamea and Picea spp.), we analyzed remotely sensed forest data from the Border Lakes landscape of northern Minnesota and northwestern Ontario. Our study area contains three regions with different management histories: (1) fine-scale logging patterns in Minnesota, (2) coarse-scale logging patterns in Ontario, and (3) very limited logging history in the Boundary Waters Canoe Area and adjacent Quetico Provincial Park. We analyzed forest basal-area data using wavelets and null models to identify: (1) at which scales forest basal area is structured, (2) where those scales of pattern are significantly present, and (3) whether regions of local significance correspond to regional boundaries that separate the study area. Results indicate that spatial patterns in host basal area are created by nonstationary processes and that these processes are further constrained by lakes and wetlands. Wavelet analysis combined with significance testing revealed a bimodal distribution of scale-specific wavelet variance and separate zones of host species basal area that partially correspond with regional boundaries, particularly between Minnesota and the Wilderness region. This research represents one of the first comparisons of forest spatial structure in this region across an international border and presents a novel method of two-dimensional wavelet analysis that can be used to identify significant scale-specific structure in spatial data.
Keywords
  • Choristoneura fumiferana,
  • forest management,
  • forest structure and composition,
  • landscape-scale patterns,
  • logging patterns,
  • MODWT,
  • multi-temporal LANDSAT,
  • remote sensing,
  • spatial legacies,
  • spatial null models,
  • wavelet variance
Publication Date
September, 2011
DOI
10.1890/09-1876.1
Publisher Statement
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Citation Information
Patrick M. A. James, Brian R. Sturtevant, Phil Townsend, Pete Wolter, et al.. "Two-dimensional wavelet analysis of spruce budworm host basal area in the Border Lakes landscape" Ecological Applications Vol. 21 Iss. 6 (2011) p. 2197 - 2209
Available at: http://works.bepress.com/peter-wolter/5/