A5080803993- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Soil and Water Nutrient Dynamics
- Climate change and permafrost
- Oceanographic and Atmospheric Processes
- Aquatic Invertebrate Ecology and Behavior
- Climate variability and models
- Isotope Analysis in Ecology
- Freshwater macroinvertebrate diversity and ecology
- Research Data Management Practices
- Water Quality and Resources Studies
- Statistics Education and Methodologies
- Hydrology and Watershed Management Studies
- Peatlands and Wetlands Ecology
- Scientific Computing and Data Management
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Smart Materials for Construction
- Groundwater and Isotope Geochemistry
- Species Distribution and Climate Change
- Tropical and Extratropical Cyclones Research
- Bacterial Genetics and Biotechnology
SUNY New Paltz
2015-2024
Virginia Tech
2015
Stroud Water Research Center
2009-2013
University of Maryland, College Park
2008
National University of Singapore
2006
University of Aberdeen
2006
Merck Institute for Science Education
2001
Massachusetts Institute of Technology
1966
We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers ecosystem metabolism. estimated daily rates respiration and gross primary production (GPP) for up full year in each lake, via maximum likelihood fits free‐water metabolism model continuous high‐frequency measurements dissolved oxygen concentrations. Uncertainties were determined by bootstrap analysis, allowing lake‐days with poorly constrained rate estimates be down‐weighted...
H. T. Odum's influential Limnology and Oceanography 1956 publication compared gross primary production (GPP) ecosystem respiration (ER) among aquatic ecosystems. Few syntheses of metabolism have been completed since. We used conceptual framework to compare GPP ER from open‐water diel oxygen curves in lakes, wetlands, estuaries, streams ( n = 350). also documented environmental drivers were strongly related lakes but weakly wetlands. highest : was lowest streams. Differences the magnitude...
Abstract Long‐term lake ice phenological records from around the Northern Hemisphere provide unique sensitive indicators of climatic variations, even prior to existence physical meteorological measurement stations. Here, we updated phenology for 60 lakes with time‐series ranging 107–204 years first re‐assessment Hemispheric trends since 2004 by adding 15 additional and 40 our study. We found that, on average, ice‐on was 11.0 days later, ice‐off 6.8 earlier, duration 17.0 shorter per century...
Abstract Lake surfaces are warming worldwide, raising concerns about lake organism responses to thermal habitat changes. Species may cope with temperature increases by shifting their seasonality or depth track suitable habitats, but these be constrained ecological interactions, life histories limiting resources. Here we use 32 million measurements from 139 lakes quantify change (percentage of non-overlap) and assess how this is exacerbated potential constraints. Long-term resulted in an...
Abstract Ponds are often identified by their small size and shallow depths, but the lack of a universal evidence-based definition hampers science weakens legal protection. Here, we compile existing pond definitions, compare ecosystem metrics (e.g., metabolism, nutrient concentrations, gas fluxes) among ponds, wetlands, lakes, propose an definition. Compiled definitions mentioned surface area depth, were largely qualitative variable. Government legislation rarely defined despite commonly...
Globally, lake surface water temperatures have warmed rapidly relative to air temperatures, but changes in deepwater and vertical thermal structure are still largely unknown. We compiled the most comprehensive data set date of long-term (1970-2009) summertime temperature profiles lakes across world examine trends drivers whole-lake structure. found significant increases at an average rate + 0.37 °C decade-1, comparable reported previously for other lakes, similarly consistent increasing...
Lake surface water temperatures are warming worldwide, raising concerns about the future integrity of valuable lake ecosystem services. In contrast to temperatures, we know far less what is happening temperature beneath surface, where most organisms live. Moreover, little which characteristics make lakes more or sensitive climate change and other environmental stressors. We examined changes in thermal structure for 231 across northeastern North America (NENA), a region with an exceptionally...
Abstract Lakes are classified by thermal mixing regimes, with shallow waterbodies historically categorized as continuously systems. Yet, recent studies demonstrate extended summertime stratification in ponds, underscoring the need to reassess classifications for waterbodies. In this study, we examined dynamics of 34 ponds and lakes across temperate North America Europe categorize identify drivers different regimes. We identified three regimes: rarely ( n = 18), intermittently 10), often 6)...
Here we document the regional effects of Tropical Cyclone Irene on thermal structure and ecosystem metabolism in nine lakes reservoirs northeastern North America using a network high-frequency, situ, automated sensors. Thermal stability declined within hours all systems following passage Irene, magnitude change was related to volume water falling lake catchment relative volume. Across systems, temperature predicted primary production, but changes mixed-layer thickness did not affect...
Abstract Small waterbodies have potentially high greenhouse gas emissions relative to their small footprint on the landscape, although there is uncertainty in model estimates. Scaling carbon dioxide (CO 2 ) and methane (CH 4 exchange with atmosphere remains challenging due an incomplete understanding characterization of spatial temporal variability CO CH . Here, we measured partial pressures ( p across 30 ponds shallow lakes during summer temperate regions Europe North America. We sampled...
Abstract Climate change is contributing to rapid changes in lake ice cover across the Northern Hemisphere, thereby impacting local communities and ecosystems. Using time‐series spanning over 87 yr for 43 lakes we found that interannual variability duration, measured as standard deviation, significantly increased only half of our studied lakes. We observed duration peaked when were, on average, covered by about 1 month, while both longer shorter long‐term mean resulted lower duration. These...
We measured under-ice thermal stratification from before ice-on through after ice-off in Lake Sunapee, New Hampshire, a large, deep, north temperate lake, using high-frequency monitoring buoy the winter season of 2007–2008 to quantify how lake varies throughout season. examined potential drivers variation stability, identified diel-scale patterns stratification, and used this dataset test hypothesis that there are two distinct phases driven by heat flux sediment followed increased solar...
Integrated carbon budgets of terrestrial and aquatic ecosystems indicate that particulate organic (POC) plays an important role in the transport, storage, turnover during its transit from land to sea. However, little is known about rates at which POC suspension metabolized downstream transport. We address this deficiency by improving existing respiration methods models assess biological lability suspended a headwater stream. Our method involves concentration stream particles tangential flow...
In recent decades, lakes have experienced unprecedented ice loss with widespread ramifications for winter ecological processes. The rapid of ice, resurgence biology, and proliferation remote sensing technologies, presents a unique opportunity to integrate disciplines further understand the broad spatial temporal patterns in its consequences. Here, we summarize phenology records 78 12 countries across North America, Europe, Asia permit inclusion harmonization situ observations future...
Abstract Increasingly, interactions between human and natural systems centre on the multi-scale restoration of ecosystems. Humans rely ecosystem services provided by streams, yet activities degrade water quality worldwide. Replanting streamside vegetation is a common practice, since trees reduce runoff stabilize banks. But does riparian tree biodiversity matter? Detrital inputs from impact in-stream processes, e.g., leaf decomposition. Since increasing distribution invasive plant species...
Lakes are sentinels of change in the landscapes which they located. Changes lake function reflected whole-system metabolism, integrates ecosystem processes across spatial and temporal scales. Recent improvements high-frequency open-water metabolism modeling techniques have enabled estimation rates gross primary production (GPP), respiration (R), net (NEP) at high resolution. However, few studies examined metabolic over daily to multi-year scales, especially oligotrophic ecosystems. Here, we...
Abstract Three crystal forms of an extracellular nuclease Staphylococcus aureus, strains V8 and Foggi, have been obtained. One these crystallizes in the tetragonal space group P41 (or P43) with unit cell dimensions a = b 48.1 A, c 63.5 4 molecules per cell. Work is progress on structure this enzyme at 4A resolution by three-dimensional methods. Several isomorphous substitutions, e.g. UO22+ p-nitroiodobenzene, successfully carried out.
Analysis and synthesis of large complex data sets are increasingly important components scientific research. To expose undergraduate students to these develop valuable data-analysis skills, a team environmental scientists education researchers created Project EDDIE (Environmental Data-Driven Inquiry Exploration). is pedagogical collaborative that develops assesses flexible modules use publicly available, allow explore range concepts in the biological, earth, sciences. These have been...
The limiting nutrient for freshwater phytoplankton productivity can vary within and between geographic regions. Understanding how local (i.e., lake catchment) regional multiple factors shift the relative importance of nitrogen (N) phosphorus (P) limitation presents a key research challenge ecosystems may enhance our understanding lakes could be managed to control eutrophication. Here, we used in situ microcosm incubations with factorial N P amendments determine type 16 across northeastern...
We measured the baseflow concentration and composition of seston suspended particulate organic carbon (POC) over a 1-yr period in White Clay Creek, third-order stream southeastern Pennsylvania Piedmont, to assess temporal variability quality at seasonal diel timescales. Each month, we sampled water under conditions every 1.5 h 24-h POC concentrations, composition, pigment content, 13C isotopic ratios. Seston concentrations exhibited strong pattern; nighttime exceeded daytime by 80% 43%,...
Abstract Ecologists are increasingly analyzing long‐term and high‐frequency sensor datasets as part of their research. As ecology becomes a more data‐rich scientific discipline, the next generation ecologists needs to develop quantitative literacy required effectively analyze, visualize, interpret large datasets. We developed assessed three modules teach undergraduate freshwater students both concepts skills needed work with These covered key ecological topics phenology, physical mixing,...
Abstract Temperate lakes are experiencing increases in warming and stratification duration while global‐scale teleconnections potentially exacerbate effects of climate change. We examined interannual surface deep water temperature change phenology a long‐term, weekly data set (1985–2017) from dimictic lake New York State, USA. developed metric, called mixing action, to capture multiple facets about the stratified period. found waters cooling water. Surface was positively correlated with air...
Ecosystem metabolism is an integrative measure of the production and respiration carbon in aquatic ecosystems. However, under-ice regions mixing periods are infrequently sampled because logistical challenges assumptions low biological activity, resulting limited understanding contribution winter epilimnetic to annual cycling. Aquatic ecosystems can emit up 76% they receive from terrestrial landscapes as dioxide atmosphere, making them significant contributors Earth's cycle. Consequently,...