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Author : Josie Hughes
Publisher : National Library of Canada = Bibliothèque nationale du Canada
Page : 127 pages
File Size : 53,5 Mb
Release : 2002
Category : Forest management
ISBN : 0612818209
Author : Josie Hughes
Publisher : Unknown
Page : 53 pages
File Size : 54,5 Mb
Release : 2006-01-01
Category : Arbres
ISBN : 066244440X
Despite ecological and management importance, little is known about the effect of forest landscape structure on the spread of mountain pine beetles (Dendroctonus ponderosae Hopkins). The general prediction from published literature is that forest fragmentation at some scale might slow the spread of infestations. However, mountain pine beetle dispersal ecology is complicated by requirement for attack en masse and a pheromone-based communication system that facilitates this aggregation process. One interesting possibility is that infestations might spread more slowly over habitat gaps across which beetles cannot communicate. To investigate this possibility, the authors developed an individual-based model of mountain pine beetle dispersal, aggregation and attack, and performed simulation experiments to explore the effects of habitat patch size, habitat compaction, communication distance, and flight behaviour on the spread rate and final extent of infestations.
Author : Richard Roland Schneider
Publisher : Unknown
Page : 18 pages
File Size : 47,8 Mb
Release : 2009
Category : Forest management
ISBN : MINN:31951D030784784
We used a simulation model and two management scenarios to investigate possible effects of a severe mountain pine beetle (Dendroctonus ponderosae Hopkins) epidemic in Alberta, Canada. Our simulated outbreak was based on the current epidemic in British Columbia, which may kill close to 80% of the province's pine volume. Our two management scenarios were conventional harvest and a pine-reduction strategy modeled on a component of Alberta's Mountain Pine Beetle Management Strategy. The pine strategy seeks to reduce the number of susceptible pine stands by 75% over the next 20 years through targeted harvesting by the forest industry. Our simulations showed that the pine strategy could not be effectively implemented, even if the beetle outbreak was delayed for 20 years. Even though we increased mill capacity by 20% and directed all harvesting to high volume pine stands during the pine strategy's surge cut, the amount of highly susceptible pine was reduced by only 43%. Additional pine volume remained within mixed stands that were not targeted by the pine strategy. When the outbreak occurred in each scenario, sufficient pine remained on the landscape for the beetle to cause the timber supply to collapse. Alternative management approaches and avenues for future research are discussed.
Author : Brian H. Aukema,Mountain Pine Beetle Initiative (Canada)
Publisher : Unknown
Page : 36 pages
File Size : 51,7 Mb
Release : 2010
Category : Aerial surveys in forestry
ISBN : MINN:31951D03026082X
Author : William G. Riel,Andrew Fall,C. Burnett
Publisher : Unknown
Page : 36 pages
File Size : 42,5 Mb
Release : 2011
Category : Forest management
ISBN : MINN:31951D03276086H
In 2007, a multi-year connectivity modelling experiment was initiated to better understand the movement potential of mountain pine beetle (MPB) in Alberta and Saskatchewan pine forests. In the first year, spatial models of highly susceptible pine forest connectivity were developed for Alberta and Saskatchewan. The following year, the study focused solely on Alberta pine forests as our investigation turned to examine the effect that different pine species have on the connectivity model. In the third year (2009-10), the influence of climate on the landscape connectivity in Alberta was explored. To investigate the impacts of possible climate changes, minimum planar graphs were developed for the Alberta pine forests based on a modified stand susceptibility index. It was found that the stand susceptibility index most closely reflected observed MPB spread patterns when there were no climatic limitations in the model. A preliminary verification of the connectivity model was also performed. Using the model to determine expected 2009 MPB locations based on observed 2008 MPB source locations, both visual and statistical comparisons were performed to determine how well the model matched observed MPB spread. Generally, MPB were preferentially selecting closely connected habitat, but some of the direction of spread did not follow expected patterns. Some factor other than habitat connectivity (such as wind direction during MPB flight or topography) was influencing MPB spread: this warrants further exploration.
Author : Anonim
Publisher : Unknown
Page : 10 pages
File Size : 54,8 Mb
Release : 2009
Category : Electronic books
ISBN : 1100131523
Author : Benjamin A. Crabb,Crabb
Publisher : CreateSpace
Page : 48 pages
File Size : 42,8 Mb
Release : 2015-02-14
Category : Nature
ISBN : 1507666594
Forecasting spatial patterns of mountain pine beetle (MPB) population success requires spatially explicit information on host pine distribution. We developed a means of producing spatially explicit datasets of pine density at 30-m resolution using existing geospatial datasets of vegetation composition and structure. Because our ultimate goal is to model MPB population success, three study areas in the western United States that have experienced recent MPB outbreaks were used for evaluation. Pine density estimates for each study area were compared to measures of cumulative MPB-caused pine mortality summarized from annual Aerial Detection Surveys (ADS). ADS data provide spatial and temporal representations of MPB-caused pine mortality collected by observers in fixed wing aircraft and are the most readily available estimates of landscape-scale impacts of MPB. Regression analyses using LANDFIRE ecological systems classifications (EVTs) as units of analysis showed that the best pine density estimates explained 75 to 98% of cumulative MPB-caused tree mortality.
Author : Terence Leckie Shore,Andrew Fall,William G. Riel
Publisher : Unknown
Page : 32 pages
File Size : 53,7 Mb
Release : 2008
Category : Nature
ISBN : MINN:31951D02782144G
The main goal of this project was to adapt existing mountain pine beetle (MPB) decision-support tools to incorporate climatic suitability information to refine the spatial characterization of present climate and to support assessments of future climate. These tools include susceptibility and risk rating systems, the MPBSim stand-scale MPB population model, the landscape-scale SELES-MPB population model, and graph-based connectivity methods. We made significant advances on all of these, resulting in a suite of tools with increased capabilities and generality. During the course of this project, we also provided decisions support in the specific areas of study, in particular Dawson Creek and central-western Alberta. The basis of the climatic suitability was the work of A. Carroll et al. (2004) which produced estimates of MPB climatic suitability in five classes across western Canada, for historical, existing and future climates. Future climate information was derived from global circulation models such as the CGCM model. They input general climate information into the BioSim tool, in conjunction with topography and other variables relevant to downscaling for MPB, to produce the MPB climatic suitability maps. We used these maps to create an adaptation of the MPB susceptibility and risk rating system that replaced the coarser location factor (based on latitude, longitude and elevation) with MPB climatic suitability. It is important to note that the MPB climatic suitability refers only to climatic conditions relevant for MPB survival and reproduction, while the susceptibility rating system incorporates pine host information. We also modified MPBSim, a stand-scale population model, to utilize the MPB climatic suitability information. In previous applications, MPBSim was adapted to local conditions via a calibration process using local weather information. In some senses, this calibration process resulted in a reasonably precise adjustment to local conditions. However, it was also fairly labour intensive and didn't account as well for spatial variability. Our approach here was to use climatic suitability to both increase spatial precision as well as produce outputs that can be readily adapted to different stand and landscapes. The SELES-MPB landscape-scale population model scales MPBSim dynamics to broad spatial areas. We modified this tool to utilize the revised MPBSim output. This supports more rapid adaptation to other landscapes, as well as allows examination of potential effects of future climate. Our Dawson Creek analysis indicated that beetle management in the Dawson Creek area could significantly affect the spread and impact of the beetle outbreak over the next 10 years, provided that high levels of fell and burn and survey efforts are maintained. Estimated impacts are significantly affected by external pressure from the main outbreak, as estimated using the provincial-scale BCMPB projection. If mountain pine beetle populations can be held low until the main outbreak subsides (which will likely occur within the next five years due to availability of hosts), management should be able to curtail major losses in the Dawson Creek area. In areas with new or no current MPB attack, especially in areas within the expanding range, there is relatively high uncertainty of how the MPB may spread, such as in central-western Alberta. We developed graph-based connectivity methods to assess the spatial pattern of high susceptibility hosts across broad regions, under historic, existing or future climates. This information has been useful to help prioritize and rank stands for treatment in areas of imminent or future risk, and to identify areas for which treatment has no benefit.
Author : Ajith H. Perera,Brian R. Sturtevant,Lisa J. Buse
Publisher : Springer
Page : 324 pages
File Size : 49,6 Mb
Release : 2015-07-27
Category : Science
ISBN : 9783319198095
Forest landscape disturbances are a global phenomenon. Simulation models are an important tool in understanding these broad scale processes and exploring their effects on forest ecosystems. This book contains a collection of insights from a group of ecologists who address a variety of processes: physical disturbances such as drought, wind, and fire; biological disturbances such as defoliating insects and bark beetles; anthropogenic influences; interactions among disturbances; effects of climate change on disturbances; and the recovery of forest landscapes from disturbances—all from a simulation modeling perspective. These discussions and examples offer a broad synopsis of the state of this rapidly evolving subject.
Author : Mary Lynn Reid
Publisher : Unknown
Page : 24 pages
File Size : 55,5 Mb
Release : 2007
Category : Fire ecology
ISBN : MINN:31951D02376437F
This study is part of a series of research papers that explore the biological, social, and economic aspects of British Columbia's mountain pine beetle epidemic. It summarizes the results of a study on the landscape variation in lodgepole pine constitutive defences, primarily measured as resin production, but also as phloem monoterpene concentration. The response of pioneer mountain pine beetles to those defences is reviewed, measured by experimentally placing beetles on trees and by attacks of free-flying beetles; effects of beetle quality (size, condition) on the beetles' responses are also examined. Finally, the results on the dispersal of mountain pine beetles through a mature lodgepole pine stand and a burned stand are presented.--Includes text from Government of Canada publications site and from document.
Author : Walter E. Cole
Publisher : Unknown
Page : 52 pages
File Size : 52,9 Mb
Release : 1980
Category : Lodgepole pine
ISBN : IND:30000098225042
Author : Anonim
Publisher : Unknown
Page : 36 pages
File Size : 53,8 Mb
Release : 2006
Category : Mountain pine beetle
ISBN : MINN:31951D02401109K
Author : Pacific Forestry Centre,Mountain Pine Beetle Initiative (Canada)
Publisher : Unknown
Page : 304 pages
File Size : 43,8 Mb
Release : 2006
Category : Forest management
ISBN : 0662426231
"This book presents a synthesis of published information on mountain pine beetle (Dendroctonus ponderosae Hopkins [Coleoptera: Scolytidae]) biology and management with an emphasis on lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) forests of western Canada. Intended as a reference for researchers as well as forest managers, the book covers three main subject areas: mountain pine beetle biology, management, and socioeconomic concerns. The chapters on biology cover taxonomy, life history and habits, distribution, insect-host tree interactions, development and survival, epidemiology, and outbreak history. The management section covers management strategy, survey and detection, proactive and preventive management, and decision support tools. The chapters on socioeconomic aspects include an economic examination of management programs and the utilization of post-beetle salvage timber in solid wood, panelboard, pulp and paper products."--Publisher's description.
Author : Mary Lynn Reid
Publisher : Unknown
Page : 28 pages
File Size : 48,8 Mb
Release : 2008
Category : Nature
ISBN : UIUC:30112101885488
This report examines the distribution of mountain pine beetles with respect to stand composition at various scales in terms of both tree species and density. It further examines how the body condition of mountain pine beetles varies across the landscape, and suggests that these findings may explain some discrepancies in the evaluation of the success of management practices in Banff National Park.
Author : International Association of Landscape Ecology. United States Regional Association. Symposium
Publisher : Unknown
Page : 268 pages
File Size : 51,8 Mb
Release : 2003
Category : Landscape ecology
ISBN : MINN:31951P00708131B