Results 41 to 50 of about 11,437 (225)

A Statistical‐Process Hybridized Approach to Modeling Permafrost Distribution in a Boreal Wetland Ecosystem, Whatì, NT, Canada

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT High‐resolution mapping of permafrost in ecologically and topographically complex landscapes remains a major challenge. Existing models of permafrost extent often rely on equilibrium assumptions, which can misrepresent conditions in regions where permafrost persists largely due to ecosystem structure.
Philip P. Bonnaventure, Sophie MacLean, Nick C. Noad, Madeleine C. Garibaldi   +3 more
wiley   +1 more source

Mechanisms of resistance of white spruce to the spruce bud moth

The Forestry Chronicle, 1996
There is a genetic basis to resistance of open-grown white spruce trees to their primary pest, the spruce bud moth, Zeiraphera canadensis Mutt. & Free. Resistance is attributable to late budburst and unknown factors associated with higher predation and parasitism of eggs and mortality of old larvae.
openaire   +1 more source

Projected Temperature and Precipitation Expand Modeled Distributions of Reynoutria spp. While Modeled Distribution Changes for Ludwigia spp. Are Scenario‐Dependent at Watershed Scales in the Pacific Northwest, USA

River Research and Applications, EarlyView.
ABSTRACT Invasive species can fundamentally alter their introduced habitats by changing natural processes and harming native species crucial to functional ecosystems and human needs. Although the number of potential invasive species is large, the suitability of novel locations to support population establishment is limited by both physical and ...
Emily E. Smoot, Rebecca L. Flitcroft, Samuel S. Chan, Braeden Van Deynze, Sean Ewen, Sunny L. Jardine   +5 more
wiley   +1 more source

Hyperspectral species maps and LiDAR‐based structured population models show future forest fire frequency may compromise forest resilience

Remote Sensing in Ecology and Conservation, EarlyView.
Monitoring forest recovery from disturbances at scale requires tracking tree dynamics, yet traditional ground‐based approaches are resource‐intensive. We present a pipeline to parameterize integral projection models (IPMs) using LiDAR data and hyperspectral‐based species maps to assess post‐fire recovery across large, forested areas at the Caribou ...
Jessica McLean, Tommaso Jucker, Alice Rosen, Sean M. McMahon, Roberto Salguero‐Gómez   +4 more
wiley   +1 more source

Visual Recognition Software for Binary Classification and Its Application to Spruce Pollen Identification. [PDF]

PLoS ONE, 2016
Discriminating between black and white spruce (Picea mariana and Picea glauca) is a difficult palynological classification problem that, if solved, would provide valuable data for paleoclimate reconstructions.
David K Tcheng, Ashwin K Nayak, Charless C Fowlkes, Surangi W Punyasena   +3 more
doaj   +1 more source

Using Airborne Laser Scanning and Sentinel‐2 to Understand Subcanopy Light Regimes and Understory Diversity of Vascular Plants in Temperate Mountain Forests

Remote Sensing in Ecology and Conservation, EarlyView.
This study demonstrates that not just Airborne Laser Scanning, but also Sentinel‐2 can effectively estimate absolute canopy cover and canopy cover heterogeneity ‐ structural metrics that determine the subcanopy light regime, found to be linked to the vascular plant species richness in the understory of temperate mountain forests.
Felix Wieland‐Glasmann, Cornelius Senf, Kristin H. Braziunas, Rupert Seidl, Peter Annighöfer   +4 more
wiley   +1 more source

Monitoring of historical structural materials with computed tomography

Structural Concrete, EarlyView.
Abstract Computed tomography (CT) is an excellent tool to solve certain engineering problems connected to material science (such as sulfate swelling, internal degradation due to freezing, and alkali silicate swelling) and to understand specific processes (frost peeling, acid action).
Kristóf Csorba, Kristóf Kapitány, Zsolt Cimer, Viktor Hlavička, András Biró, Éva Lublóy   +5 more
wiley   +1 more source

Effect of tree-ring detrending method on apparent growth trends of black and white spruce in interior Alaska

Environmental Research Letters, 2016
Boreal forests are critical sinks in the global carbon cycle. However, recent studies have revealed increasing frequency and extent of wildfires, decreasing landscape greenness, increasing tree mortality and declining growth of black and white spruce in ...
Patrick F Sullivan, Robert R Pattison, Annalis H Brownlee, Sean M P Cahoon, Teresa N Hollingsworth   +4 more
doaj   +1 more source

Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)

Ecology and Evolution, 2020
The spruce budworm, Choristoneura fumiferana, is presumed to be panmictic across vast regions of North America. We examined the extent of panmixia by genotyping 3,650 single nucleotide polymorphism (SNP) loci in 1975 individuals from 128 collections ...
Lisa M. Lumley, Esther Pouliot, Jérôme Laroche, Brian Boyle, Bryan M. T. Brunet, Roger C. Levesque, Felix A. H. Sperling, Michel Cusson   +7 more
doaj   +1 more source

A high‐altitude thermal infrared method for estimating moose abundance and demography in Rocky Mountain National Park, USA

Wildlife Biology, EarlyView.
Resource managers require accurate estimates of large herbivore abundance and demography to maintain ecological integrity. Common methods to count these species, including observations from low altitude helicopter flights, may conflict with other protected area management objectives and struggle to produce precise estimates for more cryptic species. To
Hanem G. Abouelezz, N. Thompson Hobbs
wiley   +1 more source