A5026338520- Forest Insect Ecology and Management
- Fire effects on ecosystems
- Forest Ecology and Biodiversity Studies
- Tree-ring climate responses
- Ecology and Vegetation Dynamics Studies
- Forest ecology and management
- Plant Water Relations and Carbon Dynamics
- Plant and Fungal Interactions Research
- Lichen and fungal ecology
- Insect and Pesticide Research
- Remote Sensing and LiDAR Applications
- Remote Sensing in Agriculture
- Insect Pheromone Research and Control
- Insect Pest Control Strategies
- Geology and Paleoclimatology Research
- Rangeland and Wildlife Management
- Species Distribution and Climate Change
- Land Use and Ecosystem Services
- Landslides and related hazards
- Botany and Plant Ecology Studies
- Entomological Studies and Ecology
- Cryospheric studies and observations
- Climate change and permafrost
- Forest Management and Policy
- Ocular Disorders and Treatments
Colorado State University
2021-2024
University of Saskatchewan
2018-2021
University of Wisconsin–Madison
2018-2021
Duke University
2021
Arizona State University
2020
University of Colorado Boulder
2010-2018
Washington State University
2018
University of Victoria
2010
Seabrook
1991
Increasing evidence indicates that forest disturbances are changing in response to global change, yet local variability disturbance remains high. We quantified this considerable and analyzed whether recent episodes around the globe were consistently driven by climate, if human influence modulates patterns of disturbance. combined remote sensing data on (2001-2014) with in-depth information for 50 protected landscapes their surroundings across temperate biome. Disturbance highly variable,...
This study examines influences of climate variability on spruce beetle (Dendroctonus rufipennis) outbreak across northwestern Colorado during the period 1650 2011 CE. Periods broad-scale reconstructed using documentary records and tree rings were dated to 1843-1860, 1882-1889, 1931-1957, 2004-2010. compared with seasonal temperature, precipitation, vapor pressure deficit (VPD), Palmer Drought Severity Index (PDSI), indices ocean-atmosphere oscillation that include El Niño Southern...
Abstract In the absence of broad‐scale disturbance, many temperate coniferous forests experience successful seedling establishment only when abundant seed production coincides with favorable climate. Identifying frequency past events and climate conditions for is essential to understanding how warming could affect future tree therefore forest composition or even persistence a cover. southern Rocky Mountains, USA, research on sensitivity Engelmann spruce ( Picea e ngelmannii ) subalpine fir...
Significance Across western North America, abundant susceptible pine hosts and a suitable climate during the early 21st century have promoted widespread mountain beetle (MPB) outbreaks, leading to concern that dead fuels may increase wildfire risk. The assumption outbreaks raise fire risk is driving far-reaching policy decisions involving expenditures of hundreds millions dollars. Contrary expectation an MPB outbreak increases risk, spatial overlay analysis shows no effect on subsequent area...
Abstract High‐elevation aquatic ecosystems are highly vulnerable to climate change, yet relatively few records available characterize shifts in ecosystem structure or their underlying mechanisms. Using a long‐term data set on seven alpine lakes (3126 3620 m) Colorado, USA, we show that ice‐off dates have shifted 7 days earlier over the past 33 years and spring weather conditions—especially snowfall—drive yearly variation timing. In most well studied lake, associated with increases water...
Future changes in climate are widely anticipated to increase fire frequency, particularly boreal forests where extreme warming is expected occur. Feedbacks between vegetation and may modify the direct effects of on activity shape ecological responses changing frequency. We investigate these interactions using extensive field data from Boreal Shield Saskatchewan, Canada, a region >40% forest has burned past 30 years. use geospatial assess resistance resilience eight common states frequent by...
Abstract This study used Landsat‐based detection of spruce beetle ( Dendroctonus rufipennis ) outbreak over the years 2000–2014 across Southern Rocky Mountain Ecoregion to examine spatiotemporal patterns and assess influence temperature, drought, forest characteristics, previous activity on development. During 1999–2013 period, time series were highly spatially correlated r > 0.5) at distances <5 km, but remained weakly = 0.08) >400 km. Furthermore, cluster analysis revealed...
Understanding disturbance interactions and their ecological consequences remains a major challenge for research on the response of forests to changing climate. When, where, how one may alter severity, extent, or occurrence probability subsequent is encapsulated by concept linked disturbances. Here, we evaluated 1) climate forest habitat variables, including history, interact drive 2000s spruce beetle (Dendroctonus rufipennis) infestation Engelmann (Picea engelmannii) across Southern Rocky...
The risk of bark beetle outbreaks is widely predicted to increase because a warming climate that accelerates temperature‐driven population growth and drought stress impairs host tree defenses. However, few if any studies have explicitly evaluated climatically enhanced dynamics in relation climate‐driven changes forest composition structure may alter suitability for infestation. We synthesized current understanding the interactions among climate, spruce beetles ( Dendroctonus rufipennis )...
Abstract Recent large and severe outbreaks of native bark beetles have raised concern among the general public land managers about potential for amplified fire activity in western North America. To date, majority studies examining beetle subsequent severity U.S. Rocky Mountains focused on mountain pine ( MPB ; Dendroctonus ponderosae ) lodgepole Pinus contorta forests, but few studies, particularly field addressed effects spruce rufipennis Kirby) infestation subalpine Engelmann Picea...
Abstract Understanding how severe disturbances and their interactions affect forests is key to projecting ecological change under a warming climate. Substantial increases in some biotic disturbances, such as bark beetle outbreaks, temperate forest ecosystemsmay compromise recovery vegetation type (i.e., physiognomic or resilience), especially if subsequent (e.g., herbivory) alter mechanisms. From 2005 2017, outbreaks (>90% mortality) of spruce beetles (SB, Dendroctonus rufipennis )...
Since the late 1990s, extensive outbreaks of native bark beetles (Curculionidae: Scolytinae) have affected coniferous forests throughout Europe and North America, driving changes in carbon storage, wildlife habitat, nutrient cycling, water resource provisioning. Remote sensing is a crucial tool for quantifying effects these disturbances across broad landscapes. In particular, Landsat time series (LTS) are increasingly used to characterize outbreak dynamics, including presence severity...
Abstract The spatial overlap of multiple ecological disturbances in close succession has the capacity to alter trajectories ecosystem recovery. Widespread bark beetle outbreaks and wildfire have affected many forests western North America past two decades areas important habitat for native ungulates. Bark prior fire may deplete seed supply host species, differences fire‐related regeneration strategies among species shift composition structure initial forest trajectory. Subsequent browsing...
Abstract Amplified by warming temperatures and drought, recent outbreaks of native bark beetles (Curculionidae: Scolytinae) have caused extensive tree mortality throughout Europe North America. Despite their ubiquitous nature important effects on ecosystems, forest recovery following such disturbances is poorly understood, particularly across regions with varying abiotic conditions outbreak effects. To better understand post‐outbreak a topographically complex region, we synthesized data from...
Abstract Dendroclimatological data were used to reconstruct the discharge history of Chilko River, which drains a glacierized watershed in Coast Mountains British Columbia. We correlated ring‐width records from Engelmann spruce (ES) ( Picea engelmanni ) and mountain hemlock (MH) Tsuga mertensiana trees historical hydroclimate data. Over period record, radial growth correlates significantly with temperature snow depth, respectively. found that multi‐species approach provided better model fit...
Abstract Aim We examined whether and how tree radial‐growth responses to climate have changed for the world's southernmost conifer species throughout its latitudinal distribution following rapid change in second half of 20th century. Location Temperate forests southern South America. Methods New existing tree‐ring radial growth chronologies representing entire range Pilgerodendron uviferum were grouped according latitude then differences trends non‐stationarity a drought severity index (sc...
Abstract Irruptive forest insects are a leading biotic disturbance across temperate and boreal forests. Outbreaks of becoming more frequent extensive due to anthropogenic drivers (e.g. climate land‐use), perhaps increasing the likelihood that forests will experience multiple insect‐caused disturbances. Across fire‐prone Douglas‐fir western North America, recent outbreaks spruce budworm beetle have impacted large expanses forests, with higher degree overlap than expected in some ecoregions....