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Full-Text Articles in Life Sciences
Determination Of Hydro-Morphological Effects Of The Rappahannock Shoal Channel On The District Of Columbia Nutrient Allocation Under The Chesapeake Bay Agreement, Harry V. Wang
Reports
No abstract provided.
Photoreductive Dissolution Of Ferrihydrite By Methanesulfinic Acid: Evidence Of A Direct Link Between Dimethylsulfide And Iron-Bioavailability, Anne M. Johansen, Jennifer M. Key
Photoreductive Dissolution Of Ferrihydrite By Methanesulfinic Acid: Evidence Of A Direct Link Between Dimethylsulfide And Iron-Bioavailability, Anne M. Johansen, Jennifer M. Key
All Faculty Scholarship for the College of the Sciences
Within open‐ocean regions where excess macronutrients are present, phytoplankton growth is limited by the bioavailability of iron supplied to these areas primarily within atmospheric aerosols of crustal origin. However, processes that control the abundance of biologically accessible iron in these aerosols are largely unknown. Here we show that dissolution of ferrihydrite, a surrogate iron(oxy)hydroxide phase found in atmospheric waters, is enhanced in the presence of methanesulfinic acid (MSIA, CH3SO2H, a dimethylsulfide (DMS) oxidation intermediate) in laboratory irradiation experiments with aqueous suspensions that simulate marine aerosol particles. The increased release of soluble Fe(II) is attributed to a …
Eutrophication In Farmington Bay, Great Salt Lake, Utah 2005 Annual Report, Wayne A. Wurtsbaugh, Amy M. Marcarelli
Eutrophication In Farmington Bay, Great Salt Lake, Utah 2005 Annual Report, Wayne A. Wurtsbaugh, Amy M. Marcarelli
Watershed Sciences Faculty Publications
No abstract provided.
The Importance Of Pulsed Physical Events For Sustainability Of Louisiana Coastal Forested Wetlands, William Conner, J W. Day Jr, G P. Shaffer
The Importance Of Pulsed Physical Events For Sustainability Of Louisiana Coastal Forested Wetlands, William Conner, J W. Day Jr, G P. Shaffer
Publications
A number of freshwater diversions from the Mississippi River into Louisiana’s coastal wetlands are currently in operation or in the planning stage. These diversions have multiple objectives including maintaining a desirable salinity gradient, restoring deteriorating wetlands, and enhancing fisheries. The extensive freshwater forested wetlands surrounding the western end of Lake Pontchartrain receive little or no sediment input and are currently deteriorating due to continuous flooding. Diverting nutrient-rich water through wetlands can lead to substantial nutrient removal and to enhanced accretion. The objective of this paper is to compare the impacts on freshwater wetland ecology, accretion, and water quality of several …
Natural Abundance Of Foliar 15N As An Early Indicator Of Nitrogen Deficiency In Fertilized Cotton, S. Stamatiadis, C. Christofides, C. Tsadilas, V. Samaras, James S. Schepers
Natural Abundance Of Foliar 15N As An Early Indicator Of Nitrogen Deficiency In Fertilized Cotton, S. Stamatiadis, C. Christofides, C. Tsadilas, V. Samaras, James S. Schepers
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Information on the contribution of various soil nitrogen (N) sources to plant N uptake is often needed for the implementation of sustainable or site-specific management practices in agriculture. Considering the limitations of traditional methods in meeting these needs, this study investigated the potential of leaf δ15N as an early indicator of nutrient deficiency in cotton. The spatial and temporal natural abundance of 15N was measured in the soil and leaves of a fertilized cotton field located near the village of Moschochori (Larissa, Greece). The isotopic signal of the leaves was interpreted in the context of the relative …
Nutrient Control Of Microbial Carbon Cycling Along An Ombrotrophicminerotrophic Peatland Gradient, Jason K. Keller, Angela K. Bauers, Scott D. Bridgham, Laurie E. Kellogg, Colleen M. Iversen
Nutrient Control Of Microbial Carbon Cycling Along An Ombrotrophicminerotrophic Peatland Gradient, Jason K. Keller, Angela K. Bauers, Scott D. Bridgham, Laurie E. Kellogg, Colleen M. Iversen
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Future climate change and other anthropogenic activities are likely to increase nutrient availability in many peatlands, and it is important to understand how these additional nutrients will influence peatland carbon cycling. We investigated the effects of nitrogen and phosphorus on aerobic CH4 oxidation, anaerobic carbon mineralization (as CO2 and CH4 production), and anaerobic nutrient mineralization in a bog, an intermediate fen, and a rich fen in the Upper Peninsula of Michigan. We utilized a 5-week laboratory nutrient amendment experiment in conjunction with a 6-year field nutrient fertilization experiment to consider how the relative response to nitrogen and phosphorus differed among …
Experimental Manipulation Of Shade, Silt, Nutrients And Salinity On The Temperate Reef Sponge Cymbastela Concentrica, D. E. Roberts, A. R. Davis, S. P. Cummins
Experimental Manipulation Of Shade, Silt, Nutrients And Salinity On The Temperate Reef Sponge Cymbastela Concentrica, D. E. Roberts, A. R. Davis, S. P. Cummins
Faculty of Science - Papers (Archive)
Discharge of sewage effluent into the ocean has been shown to cause changes in the structure and distribution of a range of biological assemblages, including those dominated by sponges. To date, the underlying mechanisms by which exposure to sewage alters such assemblages is unclear, although a number of potential models have been proposed. Here, a series of manipulative field experiments were done using the phototrophic spongeCymbastela concentrica. Hypotheses from the general models that increased shade, silt, nutrients or salinity gradients were tested to find a cause for observed declines in populations exposed to sewage. Changes in the variables …