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Articles 1 - 30 of 69
Full-Text Articles in Life Sciences
Influence Of A Suite Of Environmentally Relevant Conditions On Pbt Leaching From, And Sorption To, Marine Microplastic Debris, Robert C. Hale, Da Chen
Influence Of A Suite Of Environmentally Relevant Conditions On Pbt Leaching From, And Sorption To, Marine Microplastic Debris, Robert C. Hale, Da Chen
Reports
Synthetic polymers (plastics) enter marine environments from terrestrial and marine-based sources. The manner of release, the plastic’s composition/properties and ambient marine conditions determine debris fate and its impacts on living resources. It was long assumed that all plastics were persistent and inert, possessing negligible potential for chemical impacts. However, in reality, commercial polymers exhibit a range of potentials for interactions. Persistent, bioaccumulative and toxic (PBT) chemicals are lipophilic and may concentrate from ambient waters by orders of magnitude on polymer surfaces (Teuten et al., 2007). The type of polymer affects the degree of PBT sorption. Indeed, plastics have been found …
Accelerating Tropicalization And The Transformation Of Temperate Seagrass Meadows, Glenn A. Hyndes, Kenneth L. Heck Jr., Et Al, R J. Orth
Accelerating Tropicalization And The Transformation Of Temperate Seagrass Meadows, Glenn A. Hyndes, Kenneth L. Heck Jr., Et Al, R J. Orth
VIMS Articles
Climate-driven changes are altering production and functioning of biotic assemblages in terrestrial and aquatic environments. In temperate coastal waters, rising sea temperatures, warm water anomalies and poleward shifts in the distribution of tropical herbivores have had a detrimental effect on algal forests. We develop generalized scenarios of this form of tropicalization and its potential effects on the structure and functioning of globally significant and threatened seagrass ecosystems, through poleward shifts in tropical seagrasses and herbivores. Initially, we expect tropical herbivorous fishes to establish in temperate seagrass meadows, followed later by megafauna. Tropical seagrasses are likely to establish later, delayed by …
Calibration Of Vims Research Vessel Catch Data To Ensure Continuity Of Recruitment Indices For The Chesapeake Bay Region, Mary C. Fabrizio, Troy D. Tuckey
Calibration Of Vims Research Vessel Catch Data To Ensure Continuity Of Recruitment Indices For The Chesapeake Bay Region, Mary C. Fabrizio, Troy D. Tuckey
Reports
The VIMS Juvenile Fish Trawl Survey, which has been in operation since 1955, has undergone considerable changes to the sampling gear, location of sampling sites, and the methodology used to select sampling sites. Recently, a new vessel, the R/V Tidewater, replaced the R/V Fish Hawk, which had been in service for 25 years. In addition to the change in vessel, a new net was used; this net design is more robust to deployment methods and performs more consistently under varying environmental conditions. Therefore, a calibration study was conducted whereby the two research vessels with different nets fished in the same …
Population Size And Survival Rates Of Blue Catfish In Chesapeake Bay Tributaries, Mary C. Fabrizio, Troy D. Tuckey, Robert J. Latour, Gary C. White, Alicia J. Norris, Mary Groves
Population Size And Survival Rates Of Blue Catfish In Chesapeake Bay Tributaries, Mary C. Fabrizio, Troy D. Tuckey, Robert J. Latour, Gary C. White, Alicia J. Norris, Mary Groves
Reports
This report comprises two studies conducted from 2012 to 2015 to estimate population size, survival rates, and movements of invasive blue catfish in Chesapeake Bay tributaries. The first study of population-size and survival was conducted in the James River, VA (Population Size and Survival Rates of Invasive Blue Catfish in Tidal Waters of the James River Subestuary). The second study on movement and survival of blue catfish was conducted in the Potomac River, the natural boundary between Maryland and Virginia (Movement Patterns and Survival Rate of Blue Catfish in a Non-Native Habitat Estimated with a Tagging Study). The Executive Summary …
Testing Raised Foot Lines In Virginia's Striped Bass Fishery: A Gear Based Method Of Reducing Sturgeon Interactions In Anchored Gillnets, Thomas J. Murray
Testing Raised Foot Lines In Virginia's Striped Bass Fishery: A Gear Based Method Of Reducing Sturgeon Interactions In Anchored Gillnets, Thomas J. Murray
Reports
Working with commercial fishermen and scientists, the project evaluated the efficacy of altering net designs to achieve reductions in incidental contacts with protected species while maintaining harvest efficiency. In addition project participants assisted in the transfer of the new gear technology to industry as a gear-based method to reduce sturgeon interactions in gillnets targeting striped bass. The intent was to raise the effective fishing depth (webbing) of anchored gillnets interactions with protected Atlantic sturgeon while not impacting direct harvest of striped bass, the target species. The gear was shown to not impact Catch Per Unit Effort (CPUE) of the directed …
Ecological And Economic Effects Of Derelict Fishing Gear In The Chesapeake Bay 2015/2016 Final Assessment Report, Donna M. Bilkovic, H. Ward Slacum Jr., Kirk J. Havens, Danielle Zaveta, Christopher F.G. Jeffrey, Andrew M. Scheld, David Stanhope, Kory Angstadt, John D. Evans
Ecological And Economic Effects Of Derelict Fishing Gear In The Chesapeake Bay 2015/2016 Final Assessment Report, Donna M. Bilkovic, H. Ward Slacum Jr., Kirk J. Havens, Danielle Zaveta, Christopher F.G. Jeffrey, Andrew M. Scheld, David Stanhope, Kory Angstadt, John D. Evans
Reports
Derelict fishing gear represents a major challenge to marine resource management: whether through deliberate abandonment or through accidental loss, derelict traps in particular have significant negative effects both economic (e.g., reduced fishery harvest from ghost fishing and gear competition that leads to the reduced efficiency of active gear) and ecological (e.g., degraded habitats and marine food webs and crab and bycatch mortality). Throughout the Chesapeake Bay, commercial harvest of hard-shelled blue crabs is a major fishing activity: every year sees the deployment of several hundred thousand blue crab traps (known locally as crab “pots”) across the Bay, of which an …
Assessing Ecological And Economic Effects Of Derelict Fishing Gear: A Guiding Framework, Christopher F.G. Jeffrey, Kirk J. Havens, H. Ward Slacum Jr., Donna Marie Bilkovic, Danielle Zaveta, Andrew M. Scheld, Sean Willard, John D. Evans
Assessing Ecological And Economic Effects Of Derelict Fishing Gear: A Guiding Framework, Christopher F.G. Jeffrey, Kirk J. Havens, H. Ward Slacum Jr., Donna Marie Bilkovic, Danielle Zaveta, Andrew M. Scheld, Sean Willard, John D. Evans
Reports
Developing standardized protocols to assess the ecological and socio-economic effects of marine debris – especially, derelict fishing gear – is critical for the protection of natural resources and for evaluating policies and programs designed to reduce and remove debris. This document outlines a Derelict Fishing Gear Assessment Framework to guide the development and implementation of derelict gear assessment, management and mitigation. The framework draws from techniques and protocols developed to assess derelict crab traps effects in the Chesapeake Bay and on past derelict gear assessments either conducted by or known to the framework authors. However, this framework is generalized and …
Simulations Of The Effect Of Sample Size On The Maximum Observed Age In A Fish Population, John M. Hoenig
Simulations Of The Effect Of Sample Size On The Maximum Observed Age In A Fish Population, John M. Hoenig
Reports
No abstract provided.
Separating Oil From Water: Suspension-Feeding Goldfish Ingest Liquid Vegetable Oil, Kristin Edwards, Gary Rice, S. Laurie Sanderson
Separating Oil From Water: Suspension-Feeding Goldfish Ingest Liquid Vegetable Oil, Kristin Edwards, Gary Rice, S. Laurie Sanderson
Arts & Sciences Articles
We show that goldfish (Carassius auratus) voluntarily ingest liquid canola oil at the surface of the water and can swallow significant quantities of oil. The ability of fish to separate floating oil from water has not been tested previously, and the mechanisms used to retain oil in the form of suspended droplets, globules, or a surface film are unknown. Chromatograms of fatty acid methyl esters (FAMEs) prepared from gut samples confirmed that goldfish were able to obtain a substantial proportion of their daily lipid intake from canola oil at the surface of laboratory aquaria. Quantification of goldfish suspension-feeding, …
Microbial Nitrogen Processing In Hard Clam (Mercenaria Mercenaria) Aquaculture Sediments: The Relative Importance Of Denitrification And Dissimilatory Nitrate Reduction To Ammonium (Dnra), Ae Murphy, Iris C. Anderson, Ar Smyth, Bk Song, Mark Luckenbach
Microbial Nitrogen Processing In Hard Clam (Mercenaria Mercenaria) Aquaculture Sediments: The Relative Importance Of Denitrification And Dissimilatory Nitrate Reduction To Ammonium (Dnra), Ae Murphy, Iris C. Anderson, Ar Smyth, Bk Song, Mark Luckenbach
VIMS Articles
As bivalve aquaculture expands worldwide, an understanding of its role in nutrient cycling is necessary to ensure ecological sustainability and determine the potential of using bivalves for nutrient mitigation. Whereas several studies, primarily of epifaunal bivalves, have assessed denitrification, few have considered nutrient regeneration processes such as dissimilatory nitrate reduction to ammonium (DNRA), which competes with denitrification for nitrate and results in nitrogen retention rather than loss. This study compares sediment nitrogen cycling including mineralization, DNRA, and denitrification within U.S. clam aquaculture sediments to nearby uncultivated sediments, seasonally. Clam aquaculture significantly increased sediment ammonium and phosphate effluxes relative to uncultivated …
Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay (1 June 2015 - 31 May 2016) : 2016 Annual Report, Troy D. Tuckey, Mary C. Fabrizio
Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay (1 June 2015 - 31 May 2016) : 2016 Annual Report, Troy D. Tuckey, Mary C. Fabrizio
Reports
The Trawl Survey provides crucial data to state, regional, and national fisheries management agencies, including the Virginia Marine Resources Commission (VMRC), the Atlantic States Marine Fisheries Commission (ASMFC), the Mid‐Atlantic Fisheries Management Council (MAFMC), and the National Marine Fisheries Service (NMFS). The MAFMC recognizes the juvenile trawl survey as one of the key predictors of Summer Flounder recruitment. Annual indices of juvenile abundance have been generated from trawl survey data for species of key recreational, ecological, and commercial importance in the Virginia portion of Chesapeake Bay. These include Spot, Atlantic Croaker, Weakfish, Summer Flounder, Black Sea Bass, Scup, Striped Bass, …
Tracking A Marine Ecotourism Star: Movements Of The Short Ocean Sunfish Mola Ramsayi In Nusa Penida, Bali, Indonesia, Tierney Thys, John P. Ryan, Kevin C. Weng, Mark Erdmann, Joeharnani Tresnati
Tracking A Marine Ecotourism Star: Movements Of The Short Ocean Sunfish Mola Ramsayi In Nusa Penida, Bali, Indonesia, Tierney Thys, John P. Ryan, Kevin C. Weng, Mark Erdmann, Joeharnani Tresnati
VIMS Articles
Ocean sunfishes, Molidae, comprise the world’s heaviest bony fishes. They include the short mola, Mola ramsayi (Giglioli 1883), an important tourist draw at Nusa Penida and Nusa Lembongan, Bali, where SCUBA divers can observe ectoparasite-laden individuals being cleaned by smaller reef fishes. Despite widespread appeal, little is known about these fishes relative to regional oceanography. We present the first behavioral information for this species anywhere in the world. Satellite tag data indicate a wide thermal range (10–27.5°C) with depth occupation mostly (95%) in the upper 250 m and habitat preference near the bottom of the warm surface layer. One tag …
The Demographic Consequences Of Growing Older And Bigger In Oyster Populations, Jl Moore, Rom Lipcius, B Puckettt, Sj Schrieber
The Demographic Consequences Of Growing Older And Bigger In Oyster Populations, Jl Moore, Rom Lipcius, B Puckettt, Sj Schrieber
VIMS Articles
Structured population models, particularly size-or age-structured, have a long history of informing conservation and natural resource management. While size is often easier to measure than age and is the focus of many management strategies, age-structure can have important effects on population dynamics that are not captured in size-only models. However, relatively few studies have included the simultaneous effects of both age-and size-structure. To better understand how population structure, particularly that of age and size, impacts restoration and management decisions, we developed and compared a size-structured integral projection model (IPM) and an age-and size-structured IPM, using a population of Crassostrea gigas …
Integrated Assessment Of Oyster Reef Ecosystem Services: Macrofauna Utilization Of Restored Oyster Reefs, M. Lisa Kellogg, Kennedy T. Paynter, Paige G. Ross, Jennifer C. Dreyer, Cate Turner, Manisha Pant, Alan Birch, Edward Smith
Integrated Assessment Of Oyster Reef Ecosystem Services: Macrofauna Utilization Of Restored Oyster Reefs, M. Lisa Kellogg, Kennedy T. Paynter, Paige G. Ross, Jennifer C. Dreyer, Cate Turner, Manisha Pant, Alan Birch, Edward Smith
Reports
Within the Harris Creek Oyster Sanctuary in the Maryland portion of Chesapeake Bay, we evaluated relationships between basic oyster reef characteristics and the abundance and biomass of macrofauna. The eight sites selected for these studies included five restored oyster reef sites and three sites suitable for restoration that had not been restored. These sites encompassed a range of oyster biomass density and were spread throughout the sanctuary area. At each site one month prior to each of four sampling periods, divers filled four wire mesh baskets (0.1m2 surface area x 15 cm depth) with material from the site and embedded …
Virginia Game Fish Tagging Program Annual Report 2015, Susanna Musick, Lewis Gillingham
Virginia Game Fish Tagging Program Annual Report 2015, Susanna Musick, Lewis Gillingham
Reports
Through 2015, the Virginia Game Fish Tagging Program has maintained a 20-year database of records for tagged and recaptured fish. The program is a cooperative project of the Virginia Saltwater Fishing Tournament (under the Virginia Marine Resources Commission-VMRC) and the Virginia Institute of Marine Science (VIMS) of the College of William and Mary (under the VIMS Marine Advisory Program).
Integrated Assessment Of Oyster Reef Ecosystem Services: Fish And Crustacean Utilization And Trophic Linkages, M. Lisa Kellogg, Paige G. Ross, Mark Luckenbach, Jennifer C. Dreyer, Manisha Pant, Alan Birch, Sean Fate, Edward Smith, Kennedy Paynter
Integrated Assessment Of Oyster Reef Ecosystem Services: Fish And Crustacean Utilization And Trophic Linkages, M. Lisa Kellogg, Paige G. Ross, Mark Luckenbach, Jennifer C. Dreyer, Manisha Pant, Alan Birch, Sean Fate, Edward Smith, Kennedy Paynter
Reports
Using a regression design that encompassed the continuum of oyster reef biomass density in Harris Creek, MD, from unrestored reefs to those restored reefs with the greatest oyster biomass, we examined finfish and crustacean utilization of these habitats. Of the eight sites studied, three had not been subject to any restoration activities and five had been planted in 2012 with juvenile oysters set on oyster shell. All sites were sampled in April, June, August, and October 2015. During each sampling period, we assessed abundance, total length and biomass of finfish and examined gut contents to assess the diets of selected …
Nitrogen Sources And Net Growth Efficiency Of Zooplankton In Three Amazon River Plume Food Webs, Natalie Loick-Wilde, Sarah C. Weber, Brandon J. Condon, Douglas G. Capone, Victoria J. Coles, Patricia M. Medeiros, Deborah K. Steinberg, Joseph P. Montoya
Nitrogen Sources And Net Growth Efficiency Of Zooplankton In Three Amazon River Plume Food Webs, Natalie Loick-Wilde, Sarah C. Weber, Brandon J. Condon, Douglas G. Capone, Victoria J. Coles, Patricia M. Medeiros, Deborah K. Steinberg, Joseph P. Montoya
VIMS Articles
The plasticity of nitrogen specific net growth efficiency (NGE) in marine mesozooplankton is currently unresolved, with discordant lines of evidence suggesting that NGE is constant, or that it varies with nitrogen source, food availability, and food quality in marine ecosystems. Specifically, the fate of nitrogen from nitrogen fixation is poorly known. We use 15N : 14N ratios in plankton in combination with hydrological data, nutrient profiles, and nitrogen fixation rate measurements to investigate the relationship between new nitrogen sources and the nitrogen specific NGE in three plankton communities along the outer Amazon River plume. The NGE of small …
2015 Annual Awards, Virginia Institute Of Marine Science
2015 Annual Awards, Virginia Institute Of Marine Science
Miscellaneous
The Annual Awards ceremony is an occasion in which new employees and volunteers are introduced, employee service is recognized and student and faculty awards are presented.
Dissolved Organic Carbon Fluxes In The Middle Atlantic Bight: An Integrated Approach Based On Satellite Data And Ocean Model Products, Antonio Mannino, Sergio R. Signorini, Michael Novak, John Wilkin, Marjorie A.M. Friedrichs, Raymond G. Najjar
Dissolved Organic Carbon Fluxes In The Middle Atlantic Bight: An Integrated Approach Based On Satellite Data And Ocean Model Products, Antonio Mannino, Sergio R. Signorini, Michael Novak, John Wilkin, Marjorie A.M. Friedrichs, Raymond G. Najjar
VIMS Articles
Continental margins play an important role in global carbon cycle, accounting for 15-21% of the global marine primary production. Since carbon fluxes across continental margins from land to the open ocean are not well constrained, we undertook a study to develop satellite algorithms to retrieve dissolved organic carbon (DOC) and combined these satellite data with physical circulation model products to quantify the shelf boundary fluxes of DOC for the U.S. Middle Atlantic Bight (MAB). Satellite DOC was computed through seasonal relationships of DOC with colored dissolved organic matter absorption coefficients, which were derived from an extensive set of in situ …
Modeling Phytoplankton Community Response To Nutrient Loading And Climate Change In A Shallow Temperate Estuary, Sara Aimee Blachman
Modeling Phytoplankton Community Response To Nutrient Loading And Climate Change In A Shallow Temperate Estuary, Sara Aimee Blachman
Dissertations, Theses, and Masters Projects
Phytoplankton account for at least half of all primary production in estuarine waters and are at the center of biogeochemical cycles and material budgets. Environmental managers use water column chlorophyll-a (chl-a) concentrations as a basic water quality indictor, as the problems of eutrophication and hypoxia are intrinsically linked to excessive phytoplankton growth. Evidence suggests that the distribution and frequency of harmful algal blooms may be increasing worldwide. For the most part, phytoplankton communities follow a standard seasonal pattern, with specific groups dominating the assemblage during the time of year when environmental conditions correspond to their requisites for growth. However, climate …
Zooplankton Community Composition And Grazing In The Amazon River Plume And Western Tropical North Atlantic Ocean, Brandon J. Conroy
Zooplankton Community Composition And Grazing In The Amazon River Plume And Western Tropical North Atlantic Ocean, Brandon J. Conroy
Dissertations, Theses, and Masters Projects
Large river plumes and frontal zones are important physical features influencing plankton distribution in the marine environment. In the western tropical North Atlantic Ocean (WTNA) the Amazon River plume may extend over an area reaching 1.5 x 106 km2. The freshwater plume creates a low-density lens in the surface 25m and supplies silicon and phosphorus to the WTNA. These physical and chemical gradients create an ideal environment for large-scale blooms of diatom diazotroph associations (DDAs), a symbiotic relationship between nitrogen-fixing cyanobacteria and chain-forming diatoms. While the physical and chemical properties of the plume with regard to influences on phytoplankton have …
Oyster Planting Protocols To Deter Losses To Cownose Ray Predation, Roger L. Mann, Melissa Southworth, Robert A. Fisher, James A. Wesson, A. J. Erskine, T Leggett
Oyster Planting Protocols To Deter Losses To Cownose Ray Predation, Roger L. Mann, Melissa Southworth, Robert A. Fisher, James A. Wesson, A. J. Erskine, T Leggett
VIMS Articles
The utility of shell overlays to oyster (Crassostrea virginica) plantings as a cownose ray (Rhinoptera bonasus) predator deterrence mechanism was examined. Typical industry practice of oyster seed planting was followed in an experimental design employing treatment areas of 0.5-1.0 acre (0.2-0.4 hectare). Areas were prepared in the Lower Machodoc Creek, Virginia, by the initial application of shell to insure a stable substrate under planted seed oysters. Seed oysters were planted using standard industry methods. Experimental areas were located, two upstream and two downstream, of a constriction in the Lower Machodoc that dictated differing physical environments in the respective locations with …
Biogeochemistry Of Redox-Sensitive Elements In The Subterranean Estuary, Alison E. O'Connor
Biogeochemistry Of Redox-Sensitive Elements In The Subterranean Estuary, Alison E. O'Connor
Dissertations, Theses, and Masters Projects
Submarine groundwater discharge (SGD) is any flow of water along the continental margins from the seabed into the coastal ocean, and it represents an important source of nutrients and trace metals to the coastal ocean. The chemical composition of SGD is strongly influenced by biogeochemical reactions that take place within the subterranean estuary (STE), the subsurface mixing zone of fresh and saline waters. Understanding the reactions that take place within the shallow STE is critical to evaluating the composition of SGD, and therefore SGD-driven chemical fluxes. In this dissertation, I seek to determine the biogeochemical processes controlling the behavior of …
Patterns Of Abundance And Community Dynamics In Atlantic Coastal Sharks, Cassidy Peterson
Patterns Of Abundance And Community Dynamics In Atlantic Coastal Sharks, Cassidy Peterson
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Predator Richness And Habitat Heterogeneity On Prey Suppression In An Estuarine Food Chain, Leonardo K. Miyashita, J. Paul Richardson, J. Emmett Duffy
Effects Of Predator Richness And Habitat Heterogeneity On Prey Suppression In An Estuarine Food Chain, Leonardo K. Miyashita, J. Paul Richardson, J. Emmett Duffy
VIMS Articles
Predator influence on the structure of prey communities can be mediated by habitat heterogeneity, the effects of which may cascade to the base of the food webs, altering producer biomass and species composition. We carried out a mesocosm experiment manipulating the identity and richness of predators and habitat heterogeneity to test their influence on resource use effectiveness, competition among predators, and trophic cascades in a model estuarine system with 3 trophic levels (microalgae, mysids, and the predators blue crab Callinectes sapidus, sand shrimp Crangon septemspinosa, and grass shrimp Palaemonetes pugio). We hypothesized that increasing predator species richness would increase mysid …
Moving Forward 21st Century Pathways To Strengthen The Ocean Science Workforce Through Graduate Education And Professional Development, Linda C. Schaffner, T. W. Hartley, J. G. Saunders
Moving Forward 21st Century Pathways To Strengthen The Ocean Science Workforce Through Graduate Education And Professional Development, Linda C. Schaffner, T. W. Hartley, J. G. Saunders
VIMS Articles
The scope of emerging national and international ocean-related issues facing society demands that we develop broad perspectives on graduate education and training in the ocean sciences. A multifaceted ocean workforce and new kinds of intellectual partnerships are needed to address ocean science research priorities, strengthen our understanding of coupled human-natural ocean systems, engage and inform public policy and management decision making, and increase ocean literacy. Alumni from graduate programs in ocean sciences are following diverse career paths in academia, government, nongovernmental organizations, and industry, and thus can inform us about the diverse skills needed to succeed. The ocean science academic …
Influence Of Reservoir Infill On Coastal Deep Water Hypoxia, Lewis C. Linker, Richard A. Batiuk, Carl F. Cerco, Gary W. Shenk, Richard Tian, Ping Wang, Guido Yactayo
Influence Of Reservoir Infill On Coastal Deep Water Hypoxia, Lewis C. Linker, Richard A. Batiuk, Carl F. Cerco, Gary W. Shenk, Richard Tian, Ping Wang, Guido Yactayo
VIMS Articles
Ecological restoration of the Chesapeake through the Chesapeake Bay total maximum daily load (TMDL) requires the reduction of nitrogen, phosphorus, and sediment loads in the Chesapeake watershed because of the tidal water quality impairments and damage to living resources they cause. Within the Chesapeake watershed, the Conowingo Reservoir has been filling in with sediment for almost a century and is now in a state of near‐full capacity called dynamic equilibrium. The development of the Chesapeake TMDL in 2010 was with the assumption that the Conowingo Reservoir was still effectively trapping sediment and nutrients. This is now known not to …
Chemical Formation Of Hybrid Di-Nitrogen Calls Fungal Codenitrification Into Question, Rebecca L. Phillips, Bk Song, Andrew M. S. Mcmillan, Gwen Grelet, Bevan S. Weir, Thilak Palmada, Craig Tobias
Chemical Formation Of Hybrid Di-Nitrogen Calls Fungal Codenitrification Into Question, Rebecca L. Phillips, Bk Song, Andrew M. S. Mcmillan, Gwen Grelet, Bevan S. Weir, Thilak Palmada, Craig Tobias
VIMS Articles
Removal of excess nitrogen (N) can best be achieved through denitrification processes that transform N in water and terrestrial ecosystems to di-nitrogen (N-2) gas. The greenhouse gas nitrous oxide (N2O) is considered an intermediate or end-product in denitrification pathways. Both abiotic and biotic denitrification processes use a single N source to form N2O. However, N-2 can be formed from two distinct N sources (known as hybrid N-2) through biologically mediated processes of anammox and codenitrification. We questioned if hybrid N-2 produced during fungal incubation at neutral pH could be attributed to abiotic nitrosation and if N2O was consumed during N-2 …
The Nature Of Organic Carbon In Density-Fractionated Sediments In The Sacramento-San Joaquin River Delta (California), S. G. Wakeham, Elizabeth A. Canuel
The Nature Of Organic Carbon In Density-Fractionated Sediments In The Sacramento-San Joaquin River Delta (California), S. G. Wakeham, Elizabeth A. Canuel
VIMS Articles
Rivers are the primary means by which sediments and carbon are transported from the terrestrial biosphere to the oceans but gaps remain in our understanding of carbon associations from source to sink. Bed sediments from the Sacramento-San Joaquin River Delta (CA) were fractionated according to density and analyzed for sediment mass distribution, elemental (C and N) composition, mineral surface area, and stable carbon and radiocarbon isotope compositions of organic carbon (OC) and fatty acids to evaluate the nature of organic carbon in river sediments. OC was unevenly distributed among density fractions. Mass and OC were in general concentrated in mesodensity …
The Dilemma Of Derelict Gear: Datasets, Andrew M. Scheld, Donna M. Bilkovic, Kirk J. Havens
The Dilemma Of Derelict Gear: Datasets, Andrew M. Scheld, Donna M. Bilkovic, Kirk J. Havens
Data
No abstract provided.