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Shrub Expansion of Alnus viridis Drives Former Montane Grassland into Nitrogen Saturation
Ecosystems, 2016The N2-fixing shrub Alnus viridis is currently encroaching on montane grasslands in the Alps as a result of reduced land management and complete abandonment. Alnus introduces large amounts of nitrogen (N) into these formerly N-poor grasslands and restricts the succession to montane forests. We studied pools and fluxes of N and the associated C pools in
Tobias Bühlmann +2 more
semanticscholar +3 more sources
Warming-Induced Shrub Expansion and Lichen Decline in the Western Canadian Arctic
Ecosystems, 2014Strong evidence for a pan-Arctic expansion of upright shrubs comes from analysis of satellite imagery, historical photographs, vegetation plots, and growth rings. However, there are still uncertainties related to local-scale patterns of shrub growth, resulting interactions among vegetation functional groups, and the relative roles of disturbance and ...
R. Fraser +4 more
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Expansive shrubs: Expansion factors and ecological impacts in northern Ethiopia
Journal for Nature Conservation, 2021Abstract Expansive native species have the same ecological and economic consequences as invasive alien species through the reduction of ecosystem goods and services. We assessed human disturbance and environmental factors that are contributing to the expansion of two expansive shrubs, Cadia purpurea and Tarchonanthus camphoratus in Desa’a dry ...
Mebrahtu Haile +3 more
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Patterns and processes of global shrub expansion
Progress in Physical Geography: Earth and Environment, 2011Shrub expansion is a global phenomenon that is occurring on savannas, rangelands, and grasslands. In addition, this is an increasingly documented occurrence in the Arctic. Numerous recent studies have strived to pinpoint the drivers of this phenomenon, quantify the changes, and understand their implications for regional and global land use ...
Adam T. Naito, David M. Cairns
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Landscape Heterogeneity of Shrub Expansion in Arctic Alaska
Ecosystems, 2012The expansion of shrubs into tundra areas is a key terrestrial change underway in the Arctic in response to elevated temperatures during the twentieth century. Repeat photography permits a glimpse into greening satellite pixels, and it shows that, since 1950, some shrub patches have increased rapidly (hereafter expanding), while others have increased ...
Ken D. Tape +3 more
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Trees, 2014
Robust physiology of Myrica cerifera across a chronosequence (i.e., space for time substitution) of shrub thicket age classes contributes to rapid cover expansion observed in the last 50 years. Many studies have documented the causes of woody expansion into grasslands, but few address unique ...
Sheri A. Shiflett +2 more
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Robust physiology of Myrica cerifera across a chronosequence (i.e., space for time substitution) of shrub thicket age classes contributes to rapid cover expansion observed in the last 50 years. Many studies have documented the causes of woody expansion into grasslands, but few address unique ...
Sheri A. Shiflett +2 more
openaire +1 more source
Herbivores inhibit climate‐driven shrub expansion on the tundra
Global Change Biology, 2009AbstractRecent Pan‐Arctic shrub expansion has been interpreted as a response to a warmer climate. However, herbivores can also influence the abundance of shrubs in arctic ecosystems. We addressed these alternative explanations by following the changes in plant community composition during the last 10 years in permanent plots inside and outside ...
JOHAN OLOFSSON +5 more
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Variability in the expansion of trees and shrubs in boreal Alaska
Ecology, 2019AbstractThe expansion of shrubs and trees across high‐latitude ecosystems is one of the most dramatic ecological manifestations of climate change. Most of the work quantifying these changes has been done in small areas and over relatively recent time scales.
Jedediah F. Brodie +3 more
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Logic in Computer Science, 2021
The concept of bounded expansion provides a robust way to capture sparse graph classes with interesting algorithmic properties. Most notably, every problem definable in first-order logic can be solved in linear time on bounded expansion graph classes ...
Jannik Dreier
semanticscholar +1 more source
The concept of bounded expansion provides a robust way to capture sparse graph classes with interesting algorithmic properties. Most notably, every problem definable in first-order logic can be solved in linear time on bounded expansion graph classes ...
Jannik Dreier
semanticscholar +1 more source
Snow-mediated ptarmigan browsing and shrub expansion in arctic Alaska
Écoscience, 2010Large, late-winter ptarmigan migrations heavily impact the shoot, plant, and patch architecture of shrubs that remain above the snow surface. Ptarmigan browsing on arctic shrubs was assessed in the vicinity of Toolik Lake, on the north side of the Brooks Range in Alaska.
Tape, Ken D. +3 more
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