A5009938567- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Climate change and permafrost
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Cryospheric studies and observations
- Fire effects on ecosystems
- Methane Hydrates and Related Phenomena
- Water Quality and Pollution Assessment
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
- Groundwater and Isotope Geochemistry
- Peatlands and Wetlands Ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Indigenous Studies and Ecology
- Isotope Analysis in Ecology
- Coastal and Marine Management
- Marine Biology and Ecology Research
- Marine and coastal plant biology
- Wastewater Treatment and Nitrogen Removal
- Doctoral Education Challenges and Solutions
- Perfectionism, Procrastination, Anxiety Studies
- Water Quality Monitoring Technologies
- Smart Materials for Construction
Université du Québec à Montréal
2021-2025
University of New Hampshire
2015-2021
Louisiana Department of Natural Resources
2015-2021
University of New Hampshire at Manchester
2015
Abstract The Central Siberian Plateau is undergoing rapid climate change that has resulted in increased frequency of forest fires and subsequent alteration watershed carbon nutrient dynamics. Across a chronosequence (3 to >100 years since wildfire) we quantified the effects fire on quantity composition dissolved organic matter (DOM), stream water concentrations, as well in-stream uptake. Wildfires concentrations nitrate for decade, while decreasing nitrogen (DOC DON) aliphatic DOM...
Abstract The underlying mechanisms driving the coupled interactions between inorganic nitrogen uptake and dissolved organic matter are not well understood, particularly in surface waters. To determine relationship carbon (DOC) quantity nitrate (NO 3 − ) kinetics streams, we performed a series of NO Tracer Additions for Spiraling Curve Characterization experiments four streams within Lamprey River Watershed, New Hampshire, across range background DOC concentrations (1–8 mg C/L). Experiments...
Abstract Considering recent increases in anthropogenic N loading, it is essential to identify the controls on removal and retention aquatic ecosystems because fate of has consequences for water quality streams downstream ecosystems. Biological uptake nitrate (NO 3 − ) a major pathway by which removed from these Here we used data second Lotic Intersite Nitrogen eXperiment (LINX II) multivariate analysis primary drivers variation NO velocity among biomes. Across 69 study watersheds North...
Abstract A comprehensive cross‐biome assessment of major nitrogen (N) species that includes dissolved organic N (DON) is central to understanding interactions between inorganic nutrients and matter in running waters. Here, we synthesize stream water chemistry across biomes find the composition pool shifts from highly heterogeneous primarily comprised N, tandem with (DOM) becoming more N‐rich, response nutrient enrichment human disturbances. We identify two critical thresholds total (TDN)...
Dissolved organic carbon (DOC) and nitrogen (DON) are important energy nutrient sources for aquatic ecosystems. In many northern temperate, freshwater systems DOC has increased in the past 50 years. Less is known about how changes may vary across latitudes, whether DON track those of DOC. Here, we present long-term data from 74 streams distributed seven sites biomes ranging tropics to boreal forests with varying histories atmospheric acid deposition. For each stream, examined temporal trends...
A severe mental health crisis lurks in academia. Academics at all career stages (e.g., students, postdocs, faculty) have expressed high levels of stress, anxiety, depression, and other negative outcomes due to their careers (Woolston 2020; Nicholls et al. 2022). Factors including job financial insecurity, expectations productivity performance, poor work-life balance, extreme competition, toxic power dynamics, lack support been shown be the main sources among academics (Fig. 1; Woolston...
Abstract Alongside global climate change, many freshwater ecosystems are experiencing substantial shifts in the concentrations and compositions of salt ions coming from both land sea. We synthesize a risk framework for anticipating how change increasing pollution saltwater intrusion will trigger chain reactions extending headwaters to tidal waters. Salt ‘chain reactions,’ where chemical products one biogeochemical reaction influence subsequent ecosystem responses. Different impact drinking...
Abstract The advent of high‐frequency in situ optical sensors provides new opportunities to study the biogeochemistry dissolved organic matter (DOM) aquatic ecosystems. We used fDOM (fluorescent matter) examine spatial and temporal variability carbon (DOC) nitrogen (DON) across a heterogeneous stream network that varies concentration. Across ten streams explained twice concentration DOC ( r 2 = 0.82) compared DON 0.39), which suggests N‐rich fraction DOM is either more variable its sources...
Abstract The widespread browning of northern lakes has been associated with long-term increases in dissolved organic carbon and color should be linked to changes surface water dioxide, yet the covariation these three key components lake functioning remains assessed. We present trends carbon, color, dioxide from lakes, generally positive but highly variable a large degree uncoupling dioxide. highest rates change were greatest increasing trends. Lakes lowest retention times had greater...
Anthropogenic nitrogen (N) loading has had widespread effects on the integrity of aquatic ecosystems. Headwater streams play a central role in controlling watershed N budgets by serving as final environmental filter for excess nutrient inputs before they are exported to downstream receiving waters. Understanding controls in-stream cycling direct implications water quality; however, is also source greenhouse gas production including nitrous oxide (N2O). Here we review some lessons learned...
Tropical forests store large amounts of Earth’s terrestrial C, but many tropical montane streams have low dissolved organic matter (DOM). This availability energy likely limits certain pathways inorganic N uptake, as evidenced by the high rates nitrification and predominance nitrate (NO3−) in total pool seen forests. To explore influence DOM on stream cycling, we performed nutrient pulse additions NO3− with or without an added C source (acetate urea) Luquillo Experimental Forest, Puerto...
Dissolved organic matter (DOM) is a highly diverse mixture of molecules providing one the largest sources energy and nutrients to stream ecosystems. Yet in situ study DOM difficult as molecular complexity pool cannot be easily reproduced for experimental purposes. Nutrient additions streams however, have been shown repeatedly alter ambient pool. Here we demonstrate an replicable field-based method manipulating at ecosystem scale. During nutrient pulse experiments changes concentration both...
Dissolved organic matter (DOM) is a highly diverse mixture of molecules providing one the largest sources energy and nutrients to stream ecosystems. Yet in situ study DOM difficult as molecular complexity pool cannot be easily reproduced for experimental purposes. Nutrient additions streams however, have been shown repeatedly alter ambient pool. Here we demonstrate an replicable field-based method manipulating at ecosystem scale. During nutrient pulse experiments changes concentration both...
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