Results 71 to 80 of about 1,657,469 (353)

A narrow window of summer temperatures associated with shrub growth in Arctic Alaska

Environmental Research Letters, 2020
Warming in recent decades has triggered shrub expansion in Arctic and alpine tundra, which is transforming these temperature-limited ecosystems and altering carbon and nutrient cycles, fire regimes, permafrost stability, land-surface climate-feedbacks ...
Laia Andreu-Hayles, Benjamin V Gaglioti, Logan T Berner, Mathieu Levesque, Kevin J Anchukaitis, Scott J Goetz, Rosanne D’Arrigo   +6 more
doaj   +1 more source

Shrub canopy induces a decline in lichen abundance and diversity in Nunavik (Québec, Canada)

Arctic, Antarctic, and Alpine Research, 2019
Lichens are an important component of biodiversity in northern ecosystems and are involved in diverse ecological processes. They contribute to nutrient availability through nitrogen fixation, are a substantial part of caribou winter diet, and influence ...
Catherine Chagnon, Stéphane Boudreau
doaj   +1 more source

Shrub encroachment alters topsoil C:N:P stoichiometric ratios in a high-altitude forest cutover

iForest - Biogeosciences and Forestry, 2018
The effect of shrub encroachment on soil carbon (C): nitrogen (N): phosphorus (P) stoichiometric ratios are largely still unknown. We investigated this effect and the effect of shrub size in a high altitude forest cutover among four common shrub species:
Feng D, Bao W
doaj   +1 more source

Shrub-depth: Capturing Height of Dense Graphs

, 2019
The recent increase of interest in the graph invariant called tree-depth and in its applications in algorithms and logic on graphs led to a natural question: is there an analogously useful "depth" notion also for dense graphs (say; one which is stable ...
de Mendez, Patrice Ossona, Ganian, Robert, Hliněný, Petr, Nešetřil, Jaroslav, Obdržálek, Jan   +4 more
core   +1 more source

Sensitivity of the grassland-forest ecotone in East African open woodland savannah to historical rainfall variation [PDF]

, 2014
. Fossil pollen records provide key insight into the sensitivity of terrestrial ecosystems to climate change at longer time scales. However, tracing vegetation response to relatively modest historical climate fluctuations is often complicated by the ...
Gelorini, Vanessa, Ssemmanda, Immaculate, Verschuren, Dirk   +2 more
core   +1 more source

Melt Grafting of Geometry‐Tailored Voltage Stabilizers for High‐Performance Polypropylene Insulation

Advanced Functional Materials, EarlyView.
A scalable one‐step melt grafting strategy is developed to enhance the dielectric properties of isotactic polypropylene by covalently incorporating thermally stable aromatic voltage stabilizers. This solvent‐free approach improves volume resistivity and DC breakdown strength through deep trap formation and charge localization, offering a sustainable ...
Nazirul Mubin bin Normansah, Taehoon Kwon, Hana Kim, Shin‐Ki Hong, Seung Won Lee, Se Hee Lee, Ik‐Su Kwon, Masahiro Kozako, Minhee Kim, Seunggun Yu   +9 more
wiley   +1 more source

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Shrub decline and expansion of wetland vegetation revealed by very high resolution land cover change detection in the Siberian lowland tundra

, 2021
Vegetation change, permafrost degradation and their interactions affect greenhouse gas fluxes, hydrology and surface energy balance in Arctic ecosystems. The Arctic shows an overall “greening” trend (i.e.
R. Magnússon, J. Limpens, D. Kleijn, K. V. Huissteden, T. Maximov, Sylvain Lobry, M. Heijmans   +6 more
semanticscholar   +1 more source

Mass Spectrometry Imaging‐Assisted Discovery of Gallotannin Biosynthetic Genes in the Root of Paeonia suffruticosa

Advanced Science, EarlyView.
An integrated approach combining mass spectrometry imaging, transcriptomics, and phylogenetic analysis facilitated the efficient identification of genes involved in gallotannin biosynthesis in Paeonia suffruticosa. As a result, a key UGT and several SCPL acyltransferases responsible for biosynthesizing pentagalloylglucose were successfully identified ...
Yushi Liu, Wenna Duan, Weiwei Tang, Yucheng Zhao, Bin Li   +4 more
wiley   +1 more source

Influence of topography and moisture and nutrient availability on green alder function on the low arctic tundra, NT [PDF]

, 2017
The Arctic has warmed by at least 3°C over the past 50 years and this rapid warming is expected to continue. Climate warming is driving the proliferation of shrubs across the tundra biome with implications for energy balance, climate, hydrology, nutrient
Baltzer, Jennifer Lynn, Dr., Black, Katherine Louise, Ms.   +1 more
core   +1 more source