A5004304828- Coastal wetland ecosystem dynamics
- Soil erosion and sediment transport
- Peatlands and Wetlands Ecology
- Hydrology and Sediment Transport Processes
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Coastal and Marine Dynamics
- Geological formations and processes
- Fish Ecology and Management Studies
- Constructed Wetlands for Wastewater Treatment
- Flood Risk Assessment and Management
- Geology and Paleoclimatology Research
- Seed Germination and Physiology
- Ecology and Vegetation Dynamics Studies
- Water Quality and Resources Studies
- Rangeland and Wildlife Management
- Isotope Analysis in Ecology
- Coastal and Marine Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Botany, Ecology, and Taxonomy Studies
- Water Quality and Pollution Assessment
- Marine and coastal ecosystems
- Urban Stormwater Management Solutions
- Genetics and Plant Breeding
- Land Use and Ecosystem Services
United States Geological Survey
2016-2025
Florence Bascom Geoscience Center
2021-2024
University of Vienna
2020
Florida International University
2000-2003
San Diego State University
2000-2002
Southeast
2002
Typha is an iconic wetland plant found worldwide. Hybridization and anthropogenic disturbances have resulted in large increases abundance ecosystems throughout North America at a cost to native floral faunal biodiversity. As demonstrated by three regional case studies, capable of rapidly colonizing habitats forming monodominant vegetation stands due traits such as robust size, rapid growth rate, rhizomatic expansion. Increased nutrient inputs into wetlands altered hydrologic regimes are...
Abstract Managing coastal wetlands is one of the most promising activities to reduce atmospheric greenhouse gases, and it also contributes meeting United Nations Sustainable Development Goals. One options through blue carbon projects, in which mangroves, saltmarshes, seagrass are managed increase sequestration gas emissions. However, other tidal align with characteristics carbon. These called freshwater States, supratidal Australia, transitional forests Southeast Asia, estuarine South...
The United States (U.S.) coastal plain is subject to rising sea levels, land subsidence, more severe storms, and intense droughts. These changes lead inputs of marine salts into freshwater-dependent systems, creating saltwater intrusion. penetration salinity the interior exacerbated by groundwater extraction high density agricultural canals ditches throughout much rural U.S. landscape. Together intrusion level rise (SWISLR) create substantial social-ecological systems situated along plain....
Net nutrient accumulation rates were measured in riverine floodplains of the Atlantic Coastal Plain Virginia, Maryland, and Delaware, USA. The located watersheds with different land use included two sites on Chickahominy River (urban), one site Mattaponi (forested), five Pocomoke (agricultural). lie along reaches natural hydrogeomorphology restricted flooding due to channelization levees. A network feldspar clay marker horizons was placed sediment surface each floodplain 3–6 years prior...
Abstract Carbon (C) standing stocks, C mass balance, and soil burial in tidal freshwater forested wetlands (TFFW) TFFW transitioning to low‐salinity marshes along the upper estuary are not typically included “blue carbon” accounting, but may represent a significant sink. Results from two salinity transects Waccamaw Savannah rivers of U.S. Atlantic Coast show that total stocks were 322–1,264 Mg C/ha among all sites, generally shifting greater storage as increased. balance inputs (litterfall,...
Abstract This review aims to synthesize the current knowledge of sediment dynamics using insights from long‐term research conducted in watershed draining Chesapeake Bay, largest estuary U.S., inform management actions restore and its watershed. The are typical many impaired watersheds estuaries around world, this synthesis is intended be relevant transferable other sediment‐impaired systems. watershed's sources, transport, delivery, impacts discussed with implications for effectively...
ABSTRACT Wetlands respond to nutrient enrichment with characteristic increases in soil nutrients and shifts plant community composition. These responses eutrophication tend be more rapid longer lasting oligotrophic systems. In this study, we documented changes associated water quality from 1989 1999 Everglades wetlands. We accomplished by resampling soils macrophytes along four transects that were originally sampled 1989. addition documenting phosphorus (P) levels decadal species composition...
ABSTRACT Few studies have examined long‐term ecological effects of sustained low‐level nutrient enhancement on wetland biota. To determine phosphorus (P) addition Everglades marshes we added P at low levels (5, 15, and 30 μg L −1 above ambient) for 5 yr to triplicate 100‐m flow‐through channels in pristine marsh. A cascade responses occurred similar sequence among treatments. Although the rate change increased with dosing level, treatments converged enriched endpoints, characterized most...
Interspecific differences in responsiveness to temperature, photoperiod, soil salinity, and moisture confirm the hypothesis that abiotic factors differentially affect germination of salt marsh plants. In growth chamber experiments, four eight annual species responded small temperature or photoperiod. Increasing salinity decreased final proportion seeds germinating slowed for each seven tested. Higher increased five speed all species. Salinity interacted Although factor with largest effect on...
More than half of the original Everglades extent formed a patterned peat mosaic elevated ridges, lower and more open sloughs, tree islands aligned parallel to dominant flow direction. This ecologically important landscape structure remained in dynamic equilibrium for millennia prior rapid degradation over past century response human manipulation hydrologic system. Restoration is one primary objectives restoration effort. Recent research has revealed that three main drivers regulated...
Greater connectivity to stream surface water may result in greater inputs of allochthonous nutrients that could stimulate internal nitrogen (N) and phosphorus (P) cycling natural, restored, created riparian wetlands. This study investigated the effects hydrologic on soil nutrient fluxes plots ( = 20) located among four two natural freshwater wetlands varying hydrology Piedmont physiographic province Virginia. Surface was slightly deeper; sediment, sediment-N, ammonium were greater; net...
Summary 1. Our goal was to quantify short‐term phosphorus (P) partitioning and identify the ecosystem components important P cycling in wetland ecosystems. To do this, we added radiotracer oligotrophic, P‐limited Everglades marshes. 32 PO 4 water column six 1‐m 2 enclosed mesocosms located long‐hydroperiod marshes of Shark River Slough, National Park. Ecosystem were then repeatedly sampled over 18 days. 2. Water particulates (>0.45 μ m) incorporated within first minute after dosing stored...