Sarah Jovan
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View article: Overestimated natural biological nitrogen fixation translates to an exaggerated CO <sub>2</sub> fertilization effect in Earth system models
Overestimated natural biological nitrogen fixation translates to an exaggerated CO <sub>2</sub> fertilization effect in Earth system models Open
CO 2 fertilization of the terrestrial biosphere is limited by nitrogen. Biological nitrogen fixation (BNF) is the dominant natural nitrogen source to the terrestrial biosphere and can alleviate nitrogen limitation but is poorly constrained…
View article: Extracting gradients from community data with multiple stressors and empty plots: A case study and simulations
Extracting gradients from community data with multiple stressors and empty plots: A case study and simulations Open
Ecological community data are used to infer levels of environmental stressors; for example, epiphytic lichen communities can be used to estimate levels of air pollutants. If stressors are so severe that the community of interest disappears…
View article: A global dataset of terrestrial biological nitrogen fixation
A global dataset of terrestrial biological nitrogen fixation Open
Biological nitrogen fixation (BNF) is the main natural source of new nitrogen inputs in terrestrial ecosystems, supporting terrestrial productivity, carbon uptake, and other Earth system processes. We assembled a comprehensive global datas…
View article: Global terrestrial nitrogen fixation and its modification by agriculture
Global terrestrial nitrogen fixation and its modification by agriculture Open
Biological nitrogen fixation (BNF) is the largest natural source of new nitrogen (N) that supports terrestrial productivity1,2, yet estimates of global terrestrial BNF remain highly uncertain3,4. Here we show that this uncertainty is partl…
View article: Correction to: Putting biomonitors to work: native moss as a screening tool for solid waste incineration
Correction to: Putting biomonitors to work: native moss as a screening tool for solid waste incineration Open
Correction to: Environ Monit Assess (2024) 196:1177 https://doi.org/10.1007/s10661-024-13354-y
View article: Putting biomonitors to work: native moss as a screening tool for solid waste incineration
Putting biomonitors to work: native moss as a screening tool for solid waste incineration Open
Solid waste incineration (SWI) can release numerous air pollutants although the geographic reach of emissions is not routinely monitored. While many studies use moss and lichens for biomonitoring trace elements, including around SWIs, few …
View article: Lead-sheathed telecom cables and historic leaded gasoline emissions substantially raise environmental lead levels in Portland, Oregon
Lead-sheathed telecom cables and historic leaded gasoline emissions substantially raise environmental lead levels in Portland, Oregon Open
We conducted a high-resolution study of lead in an urban moss, Orthotrichum lyellii , to better understand lead distributions and sources in Portland, Oregon (United States). The outdoor lead landscape is found to be heterogenous, with lea…
View article: Joining collective impact and community science: a framework for core collaborative community science
Joining collective impact and community science: a framework for core collaborative community science Open
We propose the core collaborative community science framework, an original conceptual framework that integrates and modifies best practices from community science and collective impact groups to support investigations of environmental heal…
View article: Association of polycyclic aromatic hydrocarbons in moss with blood biomarker among nearby residents in Portland, Oregon
Association of polycyclic aromatic hydrocarbons in moss with blood biomarker among nearby residents in Portland, Oregon Open
Polycyclic aromatic hydrocarbons (PAHs) are air pollutants that are costly to measure using traditional air-quality monitoring methods. We used an epiphytic bio-indicator (moss genus: Orthotrichum ) to cost-effectively evaluate atmospheric…
View article: Heavy metals in moss guide environmental justice investigation: A case study using community science in Seattle, <scp>WA</scp> , <scp>USA</scp>
Heavy metals in moss guide environmental justice investigation: A case study using community science in Seattle, <span>WA</span> , <span>USA</span> Open
Heavy metal concentrations often vary at small spatial scales not captured by air monitoring networks, with implications for environmental justice in industrial‐adjacent communities. Pollutants measured in moss tissues are commonly used as…
View article: COVER
COVER Open
Sarmentypnum exannulatum and Warnstorfia fluitans
View article: Lichen-based critical loads for deposition of nitrogen and sulfur in US forests
Lichen-based critical loads for deposition of nitrogen and sulfur in US forests Open
Critical loads are thresholds of atmospheric deposition below which harmful ecological effects do not occur. Because lichens are sensitive to atmospheric deposition, lichen-based critical loads can foreshadow changes of other forest proces…
View article: Association of polycyclic aromatic hydrocarbons in moss with blood biomarker among nearby residents in Portland, Oregon
Association of polycyclic aromatic hydrocarbons in moss with blood biomarker among nearby residents in Portland, Oregon Open
Polycyclic aromatic hydrocarbons (PAHs) are a component of air pollutants that are costly to measure using traditional air-quality monitoring methods. We used an epiphytic bio-indicator (moss genus: Orthotrichum ) to cost-effectively evalu…
View article: Challenges characterizing N deposition to high elevation protected areas: A case study integrating instrument, simulated, and lichen inventory datasets for the Devils Postpile National Monument and surrounding region, USA
Challenges characterizing N deposition to high elevation protected areas: A case study integrating instrument, simulated, and lichen inventory datasets for the Devils Postpile National Monument and surrounding region, USA Open
Excess N deposition is a common stressor of ecological health. Sensitive biota, including many lichens, respond to small differences in atmospheric N deposition. For lands with a conservation mandate, obtaining sufficient N data to evaluat…
View article: Toward Environmental Justice in Civic Science: Youth Performance and Experience Measuring Air Pollution Using Moss as a Bio-Indicator in Industrial-Adjacent Neighborhoods
Toward Environmental Justice in Civic Science: Youth Performance and Experience Measuring Air Pollution Using Moss as a Bio-Indicator in Industrial-Adjacent Neighborhoods Open
This article reports on an interdisciplinary evaluation of the pilot phase of a community-driven civic science project. The project investigates the distribution of heavy metals in air pollution using moss growing on street trees as a bio-…
View article: Lichen species as element bioindicators for air pollution in the eastern United States of America
Lichen species as element bioindicators for air pollution in the eastern United States of America Open
Lichen element (N, S, metals) indicators of local air pollution load (a widely used technique) are recommended for five predefined regions covering central and southern parts of the eastern United States. The final recommendations integrat…
View article: Assessing Ecological Risks from Atmospheric Deposition of Nitrogen and Sulfur to US Forests Using Epiphytic Macrolichens
Assessing Ecological Risks from Atmospheric Deposition of Nitrogen and Sulfur to US Forests Using Epiphytic Macrolichens Open
Critical loads of atmospheric deposition help decision-makers identify levels of air pollution harmful to ecosystem components. But when critical loads are exceeded, how can the accompanying ecological risk be quantified? We use a 90% quan…
View article: Novel climates reverse carbon uptake of atmospherically dependent epiphytes: Climatic constraints on the iconic boreal forest lichen <i>Evernia mesomorpha</i>
Novel climates reverse carbon uptake of atmospherically dependent epiphytes: Climatic constraints on the iconic boreal forest lichen <i>Evernia mesomorpha</i> Open
Premise of the Study Changing climates are expected to affect the abundance and distribution of global vegetation, especially plants and lichens with an epiphytic lifestyle and direct exposure to atmospheric variation. The study of epiphyt…
View article: Mechanisms of nitrogen deposition effects on temperate forest lichens and trees
Mechanisms of nitrogen deposition effects on temperate forest lichens and trees Open
We review the mechanisms of deleterious nitrogen (N) deposition impacts on temperate forests, with a particular focus on trees and lichens. Elevated anthropogenic N deposition to forests has varied effects on individual organisms depending…
View article: Conditional vulnerability of plant diversity to atmospheric nitrogen deposition across the United States
Conditional vulnerability of plant diversity to atmospheric nitrogen deposition across the United States Open
Significance Human activities have elevated nitrogen (N) deposition and there is evidence that deposition impacts species diversity, but spatially extensive and context-specific estimates of N loads at which species losses begin remain elu…