Sean M. McMahon
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View article: Mosaic of Size‐Dependent Mortality in Three Ecologically and Economically Important Pine Species Reveals Patterns Across Space and Time
Mosaic of Size‐Dependent Mortality in Three Ecologically and Economically Important Pine Species Reveals Patterns Across Space and Time Open
Aim Global forests face increasing stresses from novel climate states, altered disturbance regimes and the spread of pests and pathogens. Understanding where and when mortality occurs across species' ranges—and identifying associated morta…
View article: Memories of Trees Past: Coexistence Implications of Legacy Conspecific Density Dependence
Memories of Trees Past: Coexistence Implications of Legacy Conspecific Density Dependence Open
The Janzen‐Connell Hypothesis posits that plant species diversity is maintained by a reduction in seedling survival near living conspecific trees relative to heterospecifics–known as negative conspecific density dependence (CDD). CDD facil…
View article: LiDAR and hyperspectral-based structured population models show future forest fire frequency may compromise forest resilience
LiDAR and hyperspectral-based structured population models show future forest fire frequency may compromise forest resilience Open
Forest disturbances are accelerating biodiversity loss and altering tree productivity worldwide. Post-disturbance recovery time is critical for identifying vulnerable areas and targeting conservation but varies with environmental condition…
View article: Drought response is not a species trait: Tropical tree drought sensitivity is shaped by drought characteristics, species adaptations, and individual microenvironments
Drought response is not a species trait: Tropical tree drought sensitivity is shaped by drought characteristics, species adaptations, and individual microenvironments Open
View article: Experimental Mineralisation of a Filamentous Hydrogenotrophic Methanogen in Carbonate, Phosphate, and Silicate
Experimental Mineralisation of a Filamentous Hydrogenotrophic Methanogen in Carbonate, Phosphate, and Silicate Open
Methanogenic archaea were likely among the earliest organisms to populate the Earth, perhaps contributing to the Archaean greenhouse effect; they are also widely discussed as analogues to any potential life on Mars. However, fossil evidenc…
View article: Phenological patterns of tropical mountain forest trees across the neotropics: evidence from herbarium specimens
Phenological patterns of tropical mountain forest trees across the neotropics: evidence from herbarium specimens Open
The flowering phenology of many tropical mountain forest tree species remains poorly understood, including flowering synchrony and its drivers across neotropical ecosystems. We obtained herbarium records for 427 tree species from a long-te…
View article: Modelling forest dynamics using integral projection models (IPMs) and repeat LiDAR
Modelling forest dynamics using integral projection models (IPMs) and repeat LiDAR Open
Estimating the life histories and population dynamics of trees is important for predicting how forests respond to climate change and disturbances. To do so, ecologist often use stage-structured population models, which explicitly account f…
View article: Metabolomic and morphological trait diversity display contrasting patterns in temperate forest tree communities
Metabolomic and morphological trait diversity display contrasting patterns in temperate forest tree communities Open
Studies of community assembly often explore the role of niche selection in limiting the diversity of functional traits (underdispersion) or increasing the diversity of functional traits (overdispersion) within local communities. While thes…
View article: Topography‐driven microclimate gradients shape forest structure, diversity, and composition in a temperate refugial forest
Topography‐driven microclimate gradients shape forest structure, diversity, and composition in a temperate refugial forest Open
Macroclimate drives vegetation distributions, but fine‐scale topographic variation can generate microclimate refugia for plant persistence in unsuitable areas. However, we lack quantitative descriptions of topography‐driven microclimatic v…
View article: plantMASST - Community-driven chemotaxonomic digitization of plants
plantMASST - Community-driven chemotaxonomic digitization of plants Open
Understanding the distribution of hundreds of thousands of plant metabolites across the plant kingdom presents a challenge. To address this, we curated publicly available LC-MS/MS data from 19,075 plant extracts and developed the plantMASS…
View article: Major axes of variation in tree demography across global forests
Major axes of variation in tree demography across global forests Open
The future trajectory of global forests is closely intertwined with tree demography, and a major fundamental goal in ecology is to understand the key mechanisms governing spatio‐temporal patterns in tree population dynamics. While previous…
View article: Latitudinal patterns in stabilizing density dependence of forest communities
Latitudinal patterns in stabilizing density dependence of forest communities Open
Numerous studies have shown reduced performance in plants that are surrounded by neighbours of the same species 1,2 , a phenomenon known as conspecific negative density dependence (CNDD) 3 . A long-held ecological hypothesis posits that CN…
View article: The Problem of Tree Senescence in the Role of Elevated CO<sub>2</sub> and the Carbon Cycle
The Problem of Tree Senescence in the Role of Elevated CO<sub>2</sub> and the Carbon Cycle Open
Climate change affects the terrestrial carbon cycle through many pathways. In particular, CO2 fertilization can shape tree growth, death, and tolerance or resilience to climate change (Walker et al., 2021). Titrating the role of the differ…
View article: Climate anomalies and neighbourhood crowding interact in shaping tree growth in old‐growth and selectively logged tropical forests
Climate anomalies and neighbourhood crowding interact in shaping tree growth in old‐growth and selectively logged tropical forests Open
Climate extremes and biotic interactions at the neighbourhood scale affect tropical forest dynamics with long‐term consequences for biodiversity, global carbon cycling and climate change mitigation. However, forest disturbance may change c…
View article: Functional traits and size interact to influence growth and carbon sequestration among trees in urban greenspaces
Functional traits and size interact to influence growth and carbon sequestration among trees in urban greenspaces Open
There is persistent uncertainty about how integrated plant functions, like growth, are mechanistically constrained and practically predicted by functional traits. For trees, these knowledge gaps persist for two reasons: First, studies of ‘…
View article: Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests
Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests Open
Species mean information for the six leaf water-related traits used in the paper titled: Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests.
View article: Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests
Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests Open
Species mean information for the six leaf water-related traits used in the paper titled: Climate anomalies and neighbourhood crowding interact in shaping tree growth in old-growth and selectively-logged tropical forests.
View article: Mycorrhizal feedbacks influence global forest structure and diversity
Mycorrhizal feedbacks influence global forest structure and diversity Open
One mechanism proposed to explain high species diversity in tropical systems is strong negative conspecific density dependence (CDD), which reduces recruitment of juveniles in proximity to conspecific adult plants. Although evidence shows …
View article: EP076 Improving patient safety with the RA-AB bracelet in the non-obstetric population
EP076 Improving patient safety with the RA-AB bracelet in the non-obstetric population Open
Background and Aims In 2021 we developed the Regional Anaesthetic Alert Bracelet Project (RA-AB)(1) in response to joint recommendations from OAA/AoA(2).The RA-AB helps to monitor recovery of motor function after neuraxial block and prompt…
View article: Small Field Plots Can Cause Substantial Uncertainty in Gridded Aboveground Biomass Products from Airborne Lidar Data
Small Field Plots Can Cause Substantial Uncertainty in Gridded Aboveground Biomass Products from Airborne Lidar Data Open
Emerging satellite radar and lidar platforms are being developed to produce gridded aboveground biomass (AGB) predictions that are poised to expand our understanding of global carbon stocks and changes. However, the spatial resolution of A…
View article: Damage to living trees contributes to almost half of the biomass losses in tropical forests
Damage to living trees contributes to almost half of the biomass losses in tropical forests Open
Accurate estimates of forest biomass stocks and fluxes are needed to quantify global carbon budgets and assess the response of forests to climate change. However, most forest inventories consider tree mortality as the only aboveground biom…
View article: Demographic synthesis for global tree species conservation
Demographic synthesis for global tree species conservation Open
View article: Diverse anthropogenic disturbances shift Amazon forests along a structural spectrum
Diverse anthropogenic disturbances shift Amazon forests along a structural spectrum Open
Amazon forests are being degraded by myriad anthropogenic disturbances, altering ecosystem and climate function. We analyzed the effects of a range of land‐use and climate‐change disturbances on fine‐scale canopy structure using a large da…
View article: Being Coachable Can Pay Off for Founders – Up to a Point
Being Coachable Can Pay Off for Founders – Up to a Point Open
View article: Major axes of variation in tree demography across global forests
Major axes of variation in tree demography across global forests Open
The future trajectory of global forests is closely intertwined with tree demography, and a major fundamental goal in ecology is to understand the key mechanisms governing spatial-temporal patterns in tree population dynamics. While histori…
View article: Tree damage and mortality measurements across seven ForestGEO plots in the tropics between Oct 2016 and Mar 2023
Tree damage and mortality measurements across seven ForestGEO plots in the tropics between Oct 2016 and Mar 2023 Open
Annual records (raw data) on tree survival and structural completeness of 36,524 trees (2,467 species) collected across 29 censuses in seven tropical forests distributed across the Neotropics (Amacayacu, Colombia; Barro Colorado Island (BC…
View article: Leaf gene expression trajectories during the growing season are consistent between sites and years in American beech
Leaf gene expression trajectories during the growing season are consistent between sites and years in American beech Open
Transcriptomics provides a versatile tool for ecological monitoring. Here, through genome-guided profiling of transcripts mapping to 33,042 gene models, expression differences can be discerned among multi-year and seasonal leaf samples col…
View article: Topographically driven microclimatic gradients shape patterns of forest structure, diversity, and composition at a forest-grassland transition zone
Topographically driven microclimatic gradients shape patterns of forest structure, diversity, and composition at a forest-grassland transition zone Open
Globally, forests provide important ecosystem services, but anthropogenic change may shift the boundaries of forested biomes, because small-scale environmental changes govern biome transitions. This is especially true in semi-arid forests,…
View article: Capecitabine-Associated Coronary Vasospasm and Cardiac Arrest
Capecitabine-Associated Coronary Vasospasm and Cardiac Arrest Open
Capecitabine is a prodrug of fluorouracil that specifically targets cancer cells, commonly used as monotherapy for metastatic breast and colorectal cancer. Its side effects include nausea, diarrhea, vomiting, abdominal pain, anorexia, palm…
View article: Comparative transcriptomics of tropical woody plants supports fast and furious strategy along the leaf economics spectrum in lianas
Comparative transcriptomics of tropical woody plants supports fast and furious strategy along the leaf economics spectrum in lianas Open
Lianas, climbing woody plants, influence the structure and function of tropical forests. Climbing traits have evolved multiple times, including ancestral groups such as gymnosperms and pteridophytes, but the genetic basis of the liana stra…