Forest landscape structure influences the cyclic‐eruptive spatial dynamics of forest tent caterpillar outbreaks

dc.contributor.author Robert, Louis‐Etienne
dc.contributor.author Sturtevant, Brian
dc.contributor.author Wolter, Peter
dc.contributor.author Kneeshaw, Daniel
dc.contributor.author James, Patrick
dc.contributor.author Fortin, Marie‐Josée
dc.contributor.author Wolter, Peter
dc.contributor.author Townsend, Philip
dc.contributor.author Cooke, Barry
dc.contributor.department Natural Resource Ecology and Management
dc.date 2020-08-31T17:51:10.000
dc.date.accessioned 2021-02-26T03:40:49Z
dc.date.available 2021-02-26T03:40:49Z
dc.date.issued 2020-08-01
dc.description.abstract <p>A fundamental question in forest insect ecology is the role of forest landscape structure, particularly the amount and spatial configuration of host tree species, in shaping the dynamics of recurring forest insect outbreaks. For forest tent caterpillar (FTC), independent studies do not converge on a singular conclusion, although all indicate that forest structure influences outbreak dynamics. These studies also vary in how they treat climate as a covariate. We evaluated the relative importance of host forest landscape composition and configuration, as well as climate, for their influence on FTC outbreak cycling in the twentieth century. We predicted that FTC outbreaks would exhibit greater synchrony and intensity within areas associated with higher abundance of host trees. We reconstructed FTC outbreaks from 1928 to 2006 using tree‐ring analysis within a well‐structured experimental landscape located in northwestern Ontario and northern Minnesota. Time‐series clustering and spatial nonparametric covariance were used to determine whether similarities in time series and patterns in spatial synchrony corresponded with land management history. Using constrained ordination, we compared statistical properties of outbreak time series to landscape variables representing host abundance, forest configuration, and climate. We found no evidence of climatic effects at the scale of this study, but a significant albeit small influence of landscape structure on outbreak dynamics. Outbreaks were more synchronous and more cyclic within managed zones containing a greater relative abundance of aspen and other hardwood host tree species, compared with the more conifer‐dominated Wilderness area. Yet, we also observed asynchronous outbreak dynamics across the study area, such that correlations with slower‐changing forest landscape variables varied starkly among outbreak pulses. Consequently, the strength of relationship between landscape variables and FTC outbreak patterns varied strongly through time—a result that may explain why short‐term studies yield conclusions that are at odds with one another. Our results speak to the importance of long time series, contrasting landscape structure, use of multivariate methods, and controlling for climatic variation when investigating the effects of forest landscape structure on the cyclic‐eruptive spatial dynamics for forest defoliators.</p>
dc.description.comments <p>This article is published as Robert, Louis‐Etienne, Brian R. Sturtevant, Daniel Kneeshaw, Patrick MA James, Marie‐Josée Fortin, Peter T. Wolter, Philip A. Townsend, and Barry J. Cooke. "Forest landscape structure influences the cyclic‐eruptive spatial dynamics of forest tent caterpillar outbreaks." <em>Ecosphere</em> 11, no. 8 (2020): e03096. doi: <a href="https://doi.org/10.1002/ecs2.3096">10.1002/ecs2.3096</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/nrem_pubs/357/
dc.identifier.articleid 1362
dc.identifier.contextkey 19197701
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath nrem_pubs/357
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/96737
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/nrem_pubs/357/2020_Wolter_ForestLandscape.pdf|||Fri Jan 14 23:45:37 UTC 2022
dc.source.uri 10.1002/ecs2.3096
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Entomology
dc.subject.disciplines Forest Management
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.disciplines Spatial Science
dc.subject.keywords forest fragmentation
dc.subject.keywords forest tent caterpillar
dc.subject.keywords insect outbreaks
dc.subject.keywords landscape interactions
dc.subject.keywords population cycling
dc.subject.keywords silviculture hypothesis
dc.title Forest landscape structure influences the cyclic‐eruptive spatial dynamics of forest tent caterpillar outbreaks
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication beb1e2e4-0ce9-4a7d-b268-1254e286646d
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
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