A5035428107- Peatlands and Wetlands Ecology
- Coastal wetland ecosystem dynamics
- Fire effects on ecosystems
- Geology and Paleoclimatology Research
- Soil and Water Nutrient Dynamics
- Nanoparticles: synthesis and applications
- Botany and Plant Ecology Studies
- Ecology and Vegetation Dynamics Studies
- Hydrology and Sediment Transport Processes
- Wildlife Ecology and Conservation
- Agriculture, Soil, Plant Science
- Turtle Biology and Conservation
- Fault Detection and Control Systems
- Rangeland and Wildlife Management
- Aeolian processes and effects
- Archaeology and Natural History
- Urban Stormwater Management Solutions
- Soil erosion and sediment transport
- Isotope Analysis in Ecology
- Plant Ecology and Soil Science
- Polar Research and Ecology
- Botany, Ecology, and Taxonomy Studies
- Heavy metals in environment
- Agricultural Science and Fertilization
- Fish Ecology and Management Studies
Duke University
2013-2023
Peatlands represent large terrestrial carbon banks. Given that most peat accumulates in boreal regions, where low temperatures and water saturation preserve organic matter, the existence of (sub)tropical regions remains enigmatic. Here we examined plant chemistry across a latitudinal transect from Arctic to tropics. Near-surface low-latitude has lower carbohydrate greater aromatic content than near-surface high-latitude peat, creating reduced oxidation state resulting recalcitrance. This...
Silver nanoparticles (AgNPs) are increasingly used in consumer products, biotechnology, and medicine, released into aquatic ecosystems through wastewater discharge. This study investigated the phytotoxicity of AgNPs to plants, Egeria densa Juncus effusus by measuring physiologic enzymatic responses AgNP exposure under three release scenarios: two chronic (8.7 mg, weekly) exposures either zerovalent or sulfidized silver nanoparticles; a pulsed (450 one-time) AgNPs. Plant biochemical stress...
Soils in the Antarctic Dry Valleys have been significantly influenced by soil formation factors such as parent material, climate, and topography. Factors common more temperate zones, including chemical weathering leaching of minerals, occur to a much lesser extent these cold arid soils, leading an accumulation salts bases, which will likely affect distribution biota. Since intensity may vary with topography, this study examined properties invertebrate communities along elevational gradient...
Abstract Peatlands have persisted as massive carbon sinks over millennia, even during past periods of climate change. The commonly accepted theory abiotic controls (mainly anoxia and low temperature) decomposition cannot fully explain how vast low-latitude shrub/tree dominated (wooded) peatlands consistently accrete peat under warm seasonally unsaturated conditions. Here we show, by comparing the composition ecological traits microbes between Sphagnum - shrub-dominated peatlands, that...
Reliable predictions of the environmental fate and risk engineered nanomaterials (ENMs) require a better understanding ENM reactivity in complex, biologically active systems for chronic low-concentration exposure scenarios. Here, simulated freshwater wetland mesocosms were dosed with ENMs to assess how their seasonal changes parameters influence aquatic systems. Copper-based (Kocide), known dissolve water, gold nanoparticles (AuNPs), stable against dissolution absence specific ligands, added...
Climate change is predicted to impact river systems in the southeastern United States through alterations of temperature, patterns precipitation and hydrology. Future climate scenarios for predict (1) surface water temperatures will warm concert with air (2) storm flows increase base decrease, (3) annual pattern synchronization between hydroperiod temperature be altered. These are expected disturb floodplain plant communities, making them more vulnerable establishment invasive species. The...
Despite the rapid rise in diversity and quantities of engineered nanomaterials produced, impacts these emerging contaminants on structure function ecosystems have received little attention from ecologists. Moreover, is known about how manufactured may interact with nutrient pollution altering ecosystem productivity, despite recognition that eutrophication primary water quality issue freshwater worldwide. In this study, we asked two main questions: (1) To what extent do nanoparticles affect...
Peatlands drained for agriculture or forestry are susceptible to the rapid release of greenhouse gases (GHGs) through enhanced microbial decomposition and increased frequency deep peat fires. We present evidence that rewetting subtropical wooded peatlands (STWPs) along southeastern USA coast, primarily pocosin bogs, could prevent significant carbon (C) losses. To quantify GHG emissions storage from rewetted we used eddy covariance techniques, first such estimates have been applied this major...
modern equivalents listed in the column on right. The binomials of four Walter's thirteen species are same both columns and seven differ. Explanations for differences were provided a previous paper (Wilbur 2002). At present time there seems to be complete agreement identities eleven names; two names whose it was hoped had been resolved that earlier treated differently recent by Ward (2007b). will discuss only Quercus pumila.