A5068678302- Plant Water Relations and Carbon Dynamics
- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Fire effects on ecosystems
- Plant and animal studies
- Forest ecology and management
- Plant responses to elevated CO2
- Tree-ring climate responses
- Microbial Community Ecology and Physiology
- Physiological and biochemical adaptations
- Remote Sensing in Agriculture
- Plant responses to water stress
- Tree Root and Stability Studies
- Fire dynamics and safety research
- Photosynthetic Processes and Mechanisms
- Plant Parasitism and Resistance
- Forest Ecology and Biodiversity Studies
- Climate Change and Health Impacts
- Rangeland and Wildlife Management
- Greenhouse Technology and Climate Control
- Gut microbiota and health
- Evolution and Genetic Dynamics
- Soil Carbon and Nitrogen Dynamics
- Climate change and permafrost
- Forest Management and Policy
University of British Columbia
2018-2025
Los Alamos National Laboratory
2015-2024
University of Arizona
2013-2024
Rocky Mountain Biological Laboratory
2018-2020
University of Calgary
2003-2013
Abstract Climate warming is increasingly leading to marked changes in plant and animal biodiversity, but it remains unclear how temperatures affect microbial particularly terrestrial soils. Here we show that, accordance with metabolic theory of ecology, taxonomic phylogenetic diversity soil bacteria, fungi nitrogen fixers are all better predicted by variation environmental temperature than pH. However, the rates turnover across global gradients substantially lower those recorded for trees...
Much ecological research aims to explain how climate impacts biodiversity and ecosystem-level processes through functional traits that link environment with individual performance. However, the specific climatic drivers of diversity across space time remain unclear due largely limitations in availability paired trait data. We compile analyze a global forest dataset using method based on abundance-weighted moments assess influences shapes whole-community distributions. Our approach combines...
In a rapidly changing climate, alpine plants may persist by adapting to new conditions. However, the rate at which climate is might exceed of adaptation through evolutionary processes in long-lived plants. Persistence depend on phenotypic plasticity morphology and physiology. Here we investigated patterns leaf trait variation including area, thickness, specific dry matter content, nutrients (C, N, P) isotopes (δ13C δ15N) across an elevation gradient Gongga Mountain, Sichuan Province, China....
• It is widely assumed that post-fire tree mortality results from necrosis of phloem and vascular cambium in stems, despite strong evidence reduced xylem conductivity also plays an important role. In this study, experiments with Populus balsamifera were used to demonstrate two mechanisms by which heat reduces the hydraulic xylem: air seed cavitation conduit wall deformation. Heat effects on quantified using injection isolate potential temperature-dependent changes sap surface tension pit...
Summary Model scenarios of climate change predict that warming and drought will occur simultaneously in the future many regions. The capacity woody species to modify their physiology morphology response environmental conditions is widely recognized, but little known about responses trees reduced precipitation increased temperature acting simultaneously. In a semi‐arid woodland, we assessed physiological (needle emergence, maximum photosynthesis, stomatal conductance, water use efficiency...
Disentangling the relative impacts of precipitation reduction and vapour pressure deficit (VPD) on plant water dynamics determining whether acclimation may influence these patterns in future is an important challenge. Here, we report sap flux density (FD ), stomatal conductance (Gs hydraulic conductivity (KL ) xylem anatomy piñon pine (Pinus edulis) juniper (Juniperus monosperma) trees subjected to five years reduction, atmospheric warming (elevated VPD) their combined effects. No occurred...
Soil diazotrophs play important roles in ecosystem functioning by converting atmospheric N2 into biologically available ammonium. However, the diversity and distribution of soil diazotrophic communities different forests whether they follow biogeographic patterns similar to macroorganisms still remain unclear. By sequencing nifH gene amplicons, we surveyed diversity, structure across six North American (126 nested samples). Our results showed that each forest harboured markedly these...
Wood decomposition is a major component of the global carbon cycle. Decomposition rates vary across climate gradients, which thought to reflect effects temperature and moisture on metabolic kinetics decomposers. However, also with wood traits, may influence stoichiometry decomposer metabolism as well geometry relating surface areas that decomposers colonize volumes they consume. In this paper, we combined geometric scaling theories formalize hypotheses regarding drivers rates, assessed these...
Significance Invasive alien species pose major threats to biodiversity and ecosystems. However, identifying drivers of invasion success has been challenging, in part because can achieve invasiveness different ways, each corresponding aspects demographics distribution. Employing a multidimensional perspective Europe’s flora, we find generally fall along an axis from overall poor invaders super that become abundant, widespread, invade diverse habitats. Some deviate this pattern are recently...
Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (gs ) in models vary. In particular, current understanding of drivers the variation a key parameter those models, slope (i.e. measure intrinsic plant water-use-efficiency), is still limited, particularly tropics. Here we collected diurnal measurements leaf gas exchange potential (Ψleaf ), suite traits from upper canopy 15 tropical trees two contrasting...
Exceeding thermal thresholds causes irreversible damage and ultimately loss of leaves. The lowland tropics are among the warmest forested biomes, but little is known about heat tolerance tropical forest plants. We surveyed leaf sun-exposed leaves from 147 pre-montane species by determining temperatures at which potential photosystem II efficiency based on chlorophyll a fluorescence started to decrease (TCrit ) had decreased 50% (T50 ). TCrit averaged 46.7°C (5th-95th percentile:...
Abstract The Arctic is warming twice as fast the rest of planet, leading to rapid changes in species composition and plant functional trait variation. Landscape-level maps vegetation distributions are required expand spatially-limited plot studies, overcome sampling biases associated with most accessible research areas, create baselines from which monitor environmental change. Unmanned aerial vehicles (UAVs) have emerged a low-cost method generate high-resolution imagery bridge gap between...
Abstract Ecological and evolutionary processes simultaneously regulate microbial diversity, but the their driving forces remain largely unexplored. Here we investigated ecological characteristics of microbiota in hot springs spanning a broad temperature range (54.8–80 °C) by sequencing 16S rRNA genes. Our results demonstrated that niche specialists generalists are embedded complex interaction dynamics. On thermal tolerance axis, (T) sensitive (at specific temperature) versus T-resistant...
As Earth's climate has varied strongly through geological time, studying the impacts of past change on biodiversity helps to understand risks from future change. However, it remains unclear how paleoclimate shapes spatial variation in biodiversity. Here, we assessed influence Quaternary dissimilarity taxonomic, phylogenetic, and functional composition among neighboring 200-kilometer cells (beta-diversity) for angiosperm trees worldwide. We found that larger glacial-interglacial temperature...