A5066505037- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Marine and fisheries research
- Coastal and Marine Management
- Wastewater Treatment and Nitrogen Removal
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Water Quality and Pollution Assessment
- Algal biology and biofuel production
- Biocrusts and Microbial Ecology
- Aquatic Invertebrate Ecology and Behavior
- Tropical and Extratropical Cyclones Research
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Marine and coastal plant biology
- Geology and Paleoclimatology Research
- Aquatic Ecosystems and Biodiversity
- Oceanographic and Atmospheric Processes
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Watershed Management Studies
- Marine Toxins and Detection Methods
University of North Carolina at Chapel Hill
2016-2025
Institut de Ciències del Mar
2014-2023
Hohai University
2017-2022
Virginia Tech
2021
University of North Carolina Wilmington
2009
North Carolina Institute of Medicine
2009
North Carolina Department of Environmental Quality
2001
United States Geological Survey
2001
University of Rostock
1999
Max Planck Institute for Marine Microbiology
1994
Variations of sediment organic phosphorus and carbon during the outbreak decline algal blooms in Lake Taihu, China,
Summary Cyanobacteria are the Earth's oldest known oxygen‐evolving photosynthetic microorganisms, and they have had major impacts on shaping our current atmosphere biosphere. Their long evolutionary history has enabled cyanobacteria to develop survival strategies persist as important primary producers during numerous geochemical climatic changes that taken place Earth past 3.5 billion years. Today, some cyanobacterial species form massive surface growths or ‘blooms’ produce toxins, cause...
Lake Taihu (Taihu) is the third largest freshwater lake in China and an important drinking water, fishing, tourism resource for Jiangsu Province. Recent toxic cyanobacterial blooms caused by excessive human nutrient loading have focused attention on arresting restoring to acceptable water quality conditions reducing inputs. Field sampling situ enrichment bioassays were conducted determine seasonal patterns of limitation thresholds phytoplankton growth. The TN: TP TDN:TDP mass ratios ambient...
Multiple interacting physical, chemical, and biotic factors, in proper combination, lead to the development persistence of nuisance algal blooms. Upon examining combinations environmental conditions most likely elicit blooms, commonalities analog situations become more apparent among coastal marine (dinoflagellate‐dominated), estuarine (dinoflagellate‐ cyanobacteria‐dominated), freshwater (cyanobacteria‐dominated) ecosystems. A combination following hydrological, factors will bloom‐sensitive...
Nitrogen‐limited estuaries, shallow coastal waters, and continental shelf waters cover only 15% of the world’s ocean area, but account for nearly half global oceanic primary production. This disproportionality is partly attributed to accelerating geographically expanding anthropogenic N loading eutrophication. Among inputs, atmospheric deposition (AD) (as wet‐ dryfall) groundwater (GW) discharge are considerable growing importance. AD contributes from 300 >1,000 mg m −2 yr −1 as...
New data force us to raise previous estimates of oceanic denitrification. Our revised estimate ~ 450 Tg N yr-1 (Tg = 1012 g) produces an fixed budget with a large deficit (~ 200 yr-1) that can be explained only by positing ocean has deviated far from steady-state, the need for major upwards revision inputs, particularly nitrogen fixation, or both. Oceanic denitrification significantly altered small re-distributions carbon and dissolved oxygen. Since is limiting nutrient, uncompensated...
Abstract Agricultural, urban and industrial activities have dramatically increased aquatic nitrogen phosphorus pollution (eutrophication), threatening water quality biotic integrity from headwater streams to coastal areas world‐wide. Eutrophication creates multiple problems, including hypoxic “dead zones” that reduce fish shellfish production; harmful algal blooms create taste odor problems threaten the safety of drinking food supplies; stimulation greenhouse gas releases; degradation...
Preventing harmful algal blooms (HABs) is needed to protect lakes and downstream ecosystems. Traditionally, reducing phosphorus (P) inputs was the prescribed solution for lakes, based on assumption that P universally limits HAB formation. Reduction of has decreased HABs in many but not successful others. Thus, "P-only" paradigm overgeneralized. Whole-lake experiments indicate are often stimulated more by combined nitrogen (N) enrichment rather than N or alone, indicating dynamics both...
Concentrations of phosphorus and nitrogen in surface waters are being regulated the United States European Union. Human activity has raised concentrations these nutrients, leading to eutrophication inland waters, which causes nuisance growth algae other aquatic plants. Control often had highest priority because its presumed role limiting development plant biomass. Experimental evidence shows, however, that is equally likely limit plants additions both nutrients cause substantially more algal...
There is increasing concern that accelerating environmental change attributed to human-induced warming of the planet may substantially alter patterns, distribution and intensity Harmful Algal Blooms (HABs). Changes in temperature, ocean acidification, precipitation, nutrient stress or availability, physical structure water column all influence productivity, composition, global range phytoplankton assemblages, but large uncertainty remains about how integration these climate drivers might...
Excitation-emission matrix (EEM) fluorescence was combined with parallel factor analysis (PARAFAC) to model base-extracted particulate (POM) and dissolved (DOM) organic matter quality in the Neuse River Estuary (NRE), North Carolina, before after passage of Hurricane Irene August 2011. Principle components used determine that four PARAFAC (C1-C3 C6) were terrestrial sources NRE. One component (C4), prevalent DOM nutrient-impacted streams estuaries produced phytoplankton cultures, enriched...
We examined the effects of anthropogenic and climatic perturbations on nutrient—phytoplankton interactions eutrophication in waters largest estuarine systems U.S.A., Chesapeake Bay (CB), Maryland/ Virginia, Neuse River Estuary/Pamlico Sound (NRE/PS) system, North Carolina. Both have experienced large post‐World War II increases nitrogen (N) phosphorus (P) loading, nutrient reductions been initiated to alleviate symptoms eutrophication. However, ecosystem‐level these are strongly affected by...
Anthropogenic nutrient overenrichment, coupled with rising temperatures, and an increasing frequency of extreme hydrologic events (storms droughts) are accelerating eutrophication promoting the expansion harmful algal blooms (HABs) across freshwater-to-marine continuum. All HABs—with a focus here on cyanobacterial blooms—pose serious consequences for water supplies, fisheries, recreational uses, tourism, property values. As loads grow in watersheds, they begin to compound effects legacy...