A5021151640- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Algal biology and biofuel production
- Soil and Water Nutrient Dynamics
- Wastewater Treatment and Nitrogen Removal
- Isotope Analysis in Ecology
- Coastal wetland ecosystem dynamics
- Coastal and Marine Management
- Marine and fisheries research
- Biocrusts and Microbial Ecology
- Water Quality and Pollution Assessment
- Marine and coastal plant biology
- Marine Bivalve and Aquaculture Studies
- Marine Toxins and Detection Methods
- Freshwater macroinvertebrate diversity and ecology
- Microbial Fuel Cells and Bioremediation
- Hydrology and Watershed Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Protist diversity and phylogeny
- Water Quality Monitoring and Analysis
- Diatoms and Algae Research
- Geology and Paleoclimatology Research
University of North Carolina at Chapel Hill
2016-2025
Institut de Ciències del Mar
1995-2022
Hohai University
2017-2020
Texas A&M University
2001
Montana State University
1989-1998
Ames Research Center
1998
Oregon State University
1998
Rensselaer Polytechnic Institute
1995-1997
Stockholm University
1997
Southern Regional Research Center
1996
A link exists between global warming and the worldwide proliferation of harmful cyanobacterial blooms.
Planktonic marine cyanobacteria of the genus Trichodesmium occur throughout oligotrophic tropical and subtropical oceans. Their unusual adaptations, from molecular to macroscopic level, contribute their ecological success biogeochemical importance. fixes nitrogen gas (N 2 ) under fully aerobic conditions while photosynthetically evolving oxygen. Its temporal pattern N fixation results an endogenous daily cycle that confines daylight hours. colonies provide a unique pelagic habitat supports...
Expanding human activities along the freshwater to marine continuum of coastal watersheds increasingly impact nutrient inputs, limitation primary production, and efforts reduce over-enrichment eutrophication. Historically, phosphorus (P) has been priority controlling upstream productivity, whereas nitrogen (N) characterized waters. However, changing anthropogenic have caused imbalances in N P loading, making it difficult control eutrophication by reducing only one nutrient. Furthermore,...
Nutrient overenrichment has led to dramatic increases in harmful cyanobacterial blooms, creating serious threats drinking water supplies, ecological and economic sustainability of freshwater ecosystems. Nutrient-cyanobacterial bloom interactions were examined eutrophic Lake Taihu, China. In situ microcosm nutrient dilution bioassays mesocosm addition experiments conducted determine nitrogen (N) phosphorus (P) concentration load thresholds needed control formation. Blooms dominated by toxic,...
Significance Due to different rates of change in total nitrogen (TN) and phosphorus (TP) concentrations lakes, increases TN/TP mass ratios were observed many China’s freshwater lakes during 2008 2017. This growing imbalance has important implications for aquatic ecology that remain poorly considered understood. Here, we show changes municipal wastewater treatment are a major driver lake ratios, as is more effectively removed than from wastewater. Our findings highlight the need efficient...
The permanent ice covers of Antarctic lakes in the McMurdo Dry Valleys develop liquid water inclusions response to solar heating internal aeolian-derived sediments. sediment particles serve as nutrient (inorganic and organic)–enriched microzones for establishment a physiologically ecologically complex microbial consortium capable contemporaneous photosynthesis, nitrogen fixation, decomposition. is physically chemically establishing modifying relatively nutrient- organic matter–enriched...
Blooms of blue-green algae are often associated with declines in populations large-bodied cladocerans and increased importance small cladocerans, copepods, rotifers. We conducted toxicity herbivory experiments, using a wide range herbivore taxa, to test the hypothesis that alga Microcystis aeruginosa most strongly inhibits large cladocerans. For variety M. was toxic or non-nutritious, inhibited feeding on co-occurring nutritious food. The rotifer Brachionus calyciflorus unique several...
The diversity of nitrogenase genes in a marine cyanobacterial mat was investigated through amplification fragment nifH, which encodes the Fe protein complex. amplified nifH products were characterized by DNA sequencing and compared with sequences from cultivated organisms. Phylogenetic analysis showed that similar organisms clustered together, exception anaerobic bacteria even though they represented firmicutes, (delta)-proteobacteria, (gamma)-proteobacteria. Mat most closely related to...
Cyanobacterial blooms are diagnostic of accelerating eutrophication in freshwater (FW) and estuarine (E) ecosystems. In full salinity marine (M) ecosystems more closely controlled by physical than trophic conditions. FW E initiated exacerbated (1) excessive nutrient (N P) loading. (2) high surface water temperatures (> 20°C). (3) persistent column stratification. (4) long residence time. (5) organic matter enrichment. Physical–chemical forcing features can act synergistically to control...
Renewable fuel production, particularly grain-based ethanol, is expanding rapidly in the USA. Although subsidized ethanol may provide a competitively priced transportation fuel, concerns exist about potential environmental impacts. This contribution focuses on water quality implications of expanded production and impacts perennial-grass-based cellulosic ethanol. Expanded will increase intensify corn production. Even with recommended fertilizer land conservation measures, acreage can be major...
Summary We examined the effects of regional warming and water quality on phytoplankton community succession, focussing bloom‐forming cyanobacterial genus Microcystis in subtropical Lake Taihu, China. Daily air temperatures from 1991 to 2010 indicated that onset growing season has advanced by approximately 20 days over last two decades, accumulated temperature (from 1 March 31 May) increased significantly. Since 2005, blooms have begun May more frequently than June. An increase degree for...
Temperature is generally considered as a key factor controlling algal bloom formation. Previous studies have indicated that the bloom-forming cyanobacteria Microcystis spp. overwinters near sediment surface and does not actively grow below 15°C. However, satellite images field collections from Lake Taihu, China shown blooms persisted when water temperatures were 10°C during winter, although their magnitudes smaller than periods of higher temperature. Winter cells maintained low activity able...