John W. Morgan
A5037782885- Ecology and Vegetation Dynamics Studies
- Rangeland and Wildlife Management
- Species Distribution and Climate Change
- Consumer Market Behavior and Pricing
- Pasture and Agricultural Systems
- Plant and animal studies
- Wildlife Ecology and Conservation
- Fire effects on ecosystems
- Digital Platforms and Economics
- Auction Theory and Applications
- Merger and Competition Analysis
- Land Use and Ecosystem Services
- Soil Carbon and Nitrogen Dynamics
- Peatlands and Wetlands Ecology
- Animal Ecology and Behavior Studies
- Plant Water Relations and Carbon Dynamics
- Botany, Ecology, and Taxonomy Studies
- Rangeland Management and Livestock Ecology
- Forest ecology and management
- Lichen and fungal ecology
- Soil and Water Nutrient Dynamics
- Botany and Plant Ecology Studies
- Coastal wetland ecosystem dynamics
- Ecosystem dynamics and resilience
- Biocrusts and Microbial Ecology
La Trobe University
2016-2025
University of California, Santa Cruz
2023-2024
Albury Wodonga Health
2024
University of Cambridge
2005-2023
Centro Científico Tecnológico - Mendoza
2022
Martin Luther University Halle-Wittenberg
2022
German Centre for Integrative Biodiversity Research
2022
Czech Academy of Sciences, Institute of Botany
2022
ETH Zurich
2022
Google (United States)
2022
We examine the equilibrium interaction between a market for price information (controlled by gatekeeper) and homogenous product it serves. The gatekeeper charges fees to firms that advertise prices on its Internet site consumers who access list of advertised prices. Gatekeeper profits are maximized in an where (a) exhibits dispersion; (b) sufficiently low all subscribe; (c) advertising exceed socially optimal levels, thus inducing partial firm participation; (d) below unadvertised...
For more than 30 years, the relationship between net primary productivity and species richness has generated intense debate in ecology about processes regulating local diversity. The original view, which is still widely accepted, holds that hump-shaped, with first rising then declining increasing productivity. Although recent meta-analyses questioned generality of hump-shaped patterns, these syntheses have been criticized for failing to account methodological differences among studies. We...
This paper examines four million daily price observations for more than 1,000 consumer electronics products on the comparison site http://Shopper.com . We find little support notion that prices Internet are converging to ‘law of one price.’ In addition, observed levels dispersion vary systematically with number firms listing prices. The difference between two lowest (the ‘gap’) averages 23 per cent when list prices, and falls 3.5 in markets where 17 These empirical results an implication a...
ABSTRACT In the conservation literature on land‐use change, it is often assumed that intensification drives species loss, driving a loss of functional trait diversity and ecosystem function. Modern research, however, does not support this cascade for all natural systems. paper we explore errors in assumption present conceptual model taking more mechanistic approach to species–functional association context change. We provide empirical our model's predictions demonstrating follows various...
Significance Accurate prediction of community responses to global change drivers (GCDs) is critical given the effects biodiversity on ecosystem services. There consensus that human activities are driving species extinctions at scale, but debate remains over whether GCDs systematically altering local communities worldwide. Across 105 experiments included 400 experimental manipulations, we found evidence for a lagged response herbaceous plant caused by shifts in identities and relative...
Humans dominate many important Earth system processes including the nitrogen (N) cycle. Atmospheric N deposition affects fundamental such as carbon cycling, climate regulation, and biodiversity, could result in changes to primary production. Both modelling experimentation have suggested a role for anthropogenically altered increasing productivity, nevertheless, current understanding of relative strength with respect other controls on production edaphic conditions is limited. Here we use an...
Abstract Causal effects of biodiversity on ecosystem functions can be estimated using experimental or observational designs — that pose a tradeoff between drawing credible causal inferences from correlations and generalizable inferences. Here, we develop design reduces this revisits the question how plant species diversity affects productivity. Our leverages longitudinal data 43 grasslands in 11 countries approaches borrowed fields outside ecology to draw data. Contrary many prior studies,...
Abstract High-elevation ecosystems are among the few worldwide that not yet heavily invaded by non-native plants. This is expected to change as species expand their range limits upwards fill climatic niches and respond ongoing anthropogenic disturbances. Yet, whether how quickly these changes happening has only been assessed in a isolated cases. Starting 2007, we conducted repeated surveys of plant distributions along mountain roads 11 regions from 5 continents. We show over 5- 10-year...
Abstract Models that couple habitat suitability with demographic processes offer a potentially improved approach for estimating spatial distributional shifts and extinction risk under climate change. Applying such an to five species of Australian plants contrasting traits, we show that: (i) predicted climate‐driven changes in range area are sensitive the underlying model, regardless whether traits their interaction patch configuration modeled explicitly; (ii) caution should be exercised when...
Summary The effect that the surrounding landscape matrix has on loss of species from fragmented patches remains largely unknown. To determine whether there were differences in persistence plants inhabiting remnant contrasting types we examined local extinction grassland along an urban–rural gradient western Victoria, Australia. Thirty small remnants had been comprehensively surveyed between 1979 and 1990 intensively re‐surveyed. A total 289 (26%) 1104 plant populations present 1980s not...
Grazing by domestic livestock has greatly degraded many Australian ecosystems and its legacy will be long-lasting in areas. Although are usually removed from conservation reserves because they perceived to incompatible with the of natural ecosystems, have been retained several south-eastern Australia as a management tool achieve outcomes. These cases highlight fact that no framework currently exists address question, under what circumstances (and ecosystems) is grazing—or removal...
Abstract Exotic species dominate many communities; however the functional significance of species’ biogeographic origin remains highly contentious. This debate is fuelled in part by lack globally replicated, systematic data assessing relationship between provenance, function and response to perturbations. We examined abundance native exotic plant at 64 grasslands 13 countries, a subset sites we experimentally tested responses two fundamental drivers invasion, mineral nutrient supplies...
Abstract Eutrophication is a widespread environmental change that usually reduces the stabilizing effect of plant diversity on productivity in local communities. Whether this scale dependent remains to be elucidated. Here, we determine relationship between and temporal stability for 243 communities from 42 grasslands across globe quantify chronic fertilization these relationships. Unfertilized with more species exhibit greater asynchronous dynamics among response natural fluctuations,...
Abstract Human activities are enriching many of Earth’s ecosystems with biologically limiting mineral nutrients such as nitrogen (N) and phosphorus (P). In grasslands, this enrichment generally reduces plant diversity increases productivity. The widely demonstrated positive effect on productivity suggests a potential negative feedback, whereby nutrient‐induced declines in reduce the initial gains arising from nutrient enrichment. addition, can be inhibited by accumulations dead biomass,...