Optical Contrast Of Oil Dispersed In Seawater Under Windy Conditions,
2013
Gdynia Maritime Academy
Optical Contrast Of Oil Dispersed In Seawater Under Windy Conditions, Z. Otremba, O. Zielinski, Chuanmin Hu
C-IMAGE Publications
Oil pollution of natural waters represents a serious threat for aquatic ecosystems, and the assessment of the degree of pollution requiresmeasurement strategies including remote sensing and modeling. While surface oil pollution is relatively easy to detect with radar or opticalremote sensing, underwater oil emulsions can only be detected using visible light as an information carrier. Here the Michelson contrast ofsea area polluted by an oil-in-water emulsion under various wind conditions is simulated through Monte-Carlo modeling. The results showthe premise for optimal direction of observations in which the possibility of detecting the emulsified oil is maximized.
Phosphorus Cycling In The Sargasso Sea: Investigation Using The Oxygen Isotopic Composition Of Phosphate, Enzyme-Labeled Fluorescence, And Turnover Times,
2013
Old Dominion University
Phosphorus Cycling In The Sargasso Sea: Investigation Using The Oxygen Isotopic Composition Of Phosphate, Enzyme-Labeled Fluorescence, And Turnover Times, Karen Mclaughlin, Jill A. Sohm, Gregory A. Cutter, Michael W. Lomas, Adina Paytan
OES Faculty Publications
Dissolved inorganic phosphorus (DIP) concentrations in surface water of vast areas of the ocean are extremely low (<10 nM) and phosphorus (P) availability could limit primary productivity in these regions. We explore the use of oxygen isotopic signature of dissolved phosphate (δ18OPO4) to investigate biogeochemical cycling of P in the Sargasso Sea, Atlantic Ocean. Additional techniques for studying P dynamics including 33P-based DIP turnover time estimates and percent of cells expressing alkaline phosphatase (AP) activity as measured by enzyme-labeling fluorescence are also used. In surface waters, δ18OPO4 values were lower than equilibrium by 3–6%, indicative of dissolved organic phosphorous (DOP) remineralization by extracellular enzymes. An isotope mass balance model using a variety of possible combinations of …
Using Ammonium Pore Water Profiles To Assess Stoichiometry Of Deep Remineralization Processes In Methanogenic Continental Margin Sediments,
2013
Old Dominion University
Using Ammonium Pore Water Profiles To Assess Stoichiometry Of Deep Remineralization Processes In Methanogenic Continental Margin Sediments, David J. Burdige, Tomoko Komada
OES Faculty Publications
In many continental margin Sediments, a deep reaction zone exists which is separated from remineralization processes near the sediment surface. Here, methane diffuses upward to a depth where it is oxidized by downwardly diffusing sulfate. However, the methane sources that drive this anaerobic oxidation of methane (AOM) in the sulfate-methane transition zone (SMT) may vary among sites. In particular, these sources can be thought of as either (i) "internal" sources from in situ methanogenesis (regardless of where it occurs in the sediment column) that are ultimately coupled to organic matter deposition and burial, or (ii) "external" sources such as hydrocarbon …
Diatom Proteomics Reveals Unique Acclimation Strategies To Mitigate Fe Limitation,
2013
Old Dominion University
Diatom Proteomics Reveals Unique Acclimation Strategies To Mitigate Fe Limitation, Brook L. Nunn, Jessica F. Faux, Anna A. Hippman, Maria T. Maldonado, H. Rodger Harvey, David R. Goodlett, Philip W. Boyd, Robert F. Strzepek
OES Faculty Publications
Phytoplankton growth rates are limited by the supply of iron (Fe) in approximately one third of the open ocean, with major implications for carbon dioxide sequestration and carbon (C) biogeochemistry. To date, understanding how alteration of Fe supply changes phytoplankton physiology has focused on traditional metrics such as growth rate, elemental composition, and biophysical measurements such as photosynthetic competence (Fv/Fm). Researchers have subsequently employed transcriptomics to probe relationships between changes in Fe supply and phytoplankton physiology. Recently, studies have investigated longer-term (i.e. following acclimation) responses of phytoplankton to various Fe conditions. In the present study, the coastal diatom, Thalassiosira pseudonana, …
Effect Of Laser Ablation Depth In Otolith Life History Scans,
2013
Old Dominion University
Effect Of Laser Ablation Depth In Otolith Life History Scans, Renée R. Hoover, Cynthia M. Jones
OES Faculty Publications
Life history scans of fish otoliths are bringing new insight into the structure, connectivity, and movement of fish populations. Data obtained from such scans, however, possess in-herent limitations that have not yet been fully addressed or understood. For example, several investigators have noted delays in otolith elemental uptake that do not appear to reflect habitat exposure. We hypothesized that the 3-dimensional structure of otoliths may produce sampling artifacts in the results obtained from laser ablation scans. To test this hypothesis, we sampled sagittal otoliths from juvenile Atlantic croaker Micropogonias undulatus with laser ablation inductively coupled plasma mass spectrometry to obtain …
Wintering Eiders Acquire Exceptional Se And Cd Burdens In The Bering Sea: Physiological And Oceanographic Factors,
2013
Old Dominion University
Wintering Eiders Acquire Exceptional Se And Cd Burdens In The Bering Sea: Physiological And Oceanographic Factors, James R. Lovvorn, Merl F. Raisbeck, Lee W. Cooper, Gregory A. Cutter, Micah W. Miller, Marjorie L. Brooks, Jacqueline M. Grebmeier, Angela C. Matz, Cortney M. Schaefer
OES Faculty Publications
During late winter (March) in the Bering Sea, levels of Se in livers and Cd in kidneys of spectacled eiders Somateria fischeri were exceptionally high (up to 489 and 312 µg g−1 dry mass, respectively). Comparison of organ and blood samples during late winter, early spring migration, and breeding suggests that the eiders’ high Se and Cd burdens were accumulated at sea, with highest exposure during winter. High exposure may have resulted from high metabolic demands and food intake, as well as concentrations in food. In the eiders’ remote wintering area, their bivalve prey contained comparable Se levels and …
Combined Effects Of Co2 And Light On Large And Small Isolates Of The Unicellular N2-Fixing Cyanobacterium Crocosphaera Watsonii From The Western Tropical Atlantic Ocean,
2013
Old Dominion University
Combined Effects Of Co2 And Light On Large And Small Isolates Of The Unicellular N2-Fixing Cyanobacterium Crocosphaera Watsonii From The Western Tropical Atlantic Ocean, Nathan S. Garcia, Fei-Xue Fu, Cynthia L. Breene, Elizabeth K. Yu, Peter W. Bernhardt, Margaret R. Mulholland, David A. Hutchins
OES Faculty Publications
We examined the combined effects of light and pCO2 on growth, CO2-fixation and N2-fixation rates by strains of the unicellular marine N2-fixing cyanobacterium Crocosphaera watsonii with small (WH0401) and large (WH0402) cells that were isolated from the western tropical Atlantic Ocean. In low-pCO2-acclimated cultures (190ppm) of WH0401, growth, CO2-fixation and N2-fixation rates were significantly lower than those in cultures acclimated to higher (present-day approximate to 385ppm, or future approximate to 750ppm) pCO2 treatments. Growth rates were not significantly different, however, in low-pCO2-acclimated cultures of …
Bacterial Colonization And Extinction On Marine Aggregates: Stochastic Model Of Species Presence And Abundance,
2013
Old Dominion University
Bacterial Colonization And Extinction On Marine Aggregates: Stochastic Model Of Species Presence And Abundance, Andrew M. Kramer, M. Maille Lyons, Fred C. Dobbs, John M. Drake
OES Faculty Publications
Organic aggregates provide a favorable habitat for aquatic microbes, are efficiently filtered by shellfish, and may play a major role in the dynamics of aquatic pathogens. Quantifying this role requires understanding how pathogen abundance in the water and aggregate size interact to determine the presence and abundance of pathogen cells on individual aggregates. We build upon current understanding of the dynamics of bacteria and bacterial grazers on aggregates to develop a model for the dynamics of a bacterial pathogen species. The model accounts for the importance of stochasticity and the balance between colonization and extinction. Simulation results suggest that while …
Front Matter,
2013
University of Tennessee, Knoxville
Reproductive Biology Of The Frecklebelly Darter, Percina Stictogaster (Teleostei: Percidae),
2013
University of Tennessee, Knoxville
Reproductive Biology Of The Frecklebelly Darter, Percina Stictogaster (Teleostei: Percidae), David J. Eisenhour, Audrey M. Richter, Lynn V. Eisenhour, Carol-Rose Gingras
Southeastern Fishes Council Proceedings
No abstract provided.
Post-Hurricane Katrina Survey For The Blackmouth Shiner (Notropis Melanostomus) At Historical Localities In Mississippi,
2013
University of Tennessee, Knoxville
Post-Hurricane Katrina Survey For The Blackmouth Shiner (Notropis Melanostomus) At Historical Localities In Mississippi, Martin T. O'Connell, Anne M. Usee O'Connell
Southeastern Fishes Council Proceedings
No abstract provided.
Rediscovery Of A Lost Paratype Of The Boulder Darter, Etheostoma Wapiti,
2013
University of Tennessee, Knoxville
Rediscovery Of A Lost Paratype Of The Boulder Darter, Etheostoma Wapiti, Michael H. Doosey
Southeastern Fishes Council Proceedings
No abstract provided.
2011 Treasurer's Report For The Southeastern Fishes Council,
2013
University of Tennessee, Knoxville
2011 Treasurer's Report For The Southeastern Fishes Council
Southeastern Fishes Council Proceedings
No abstract provided.
Minutes, Business Meeting, 37th Annual Meeting, Southeastern Fishes Council,
2013
University of Tennessee, Knoxville
Minutes, Business Meeting, 37th Annual Meeting, Southeastern Fishes Council, Southeastern Fishes Council
Southeastern Fishes Council Proceedings
No abstract provided.
Biology Department Newsletter, No. 3,
2013
Sacred Heart University
Biology Department Newsletter, No. 3, Sacred Heart University
Biology Newsletter
No abstract provided.
Human Disturbance Of Seagrass Beds In Hoga Island, Indonesia : Impacts On Edge Effects,
2013
Montclair State University
Human Disturbance Of Seagrass Beds In Hoga Island, Indonesia : Impacts On Edge Effects, Anthony John Suleski
Theses, Dissertations and Culminating Projects
Ecosystems are broad classifications of areas where overlapping communities exist which can contain relatively high faunal and floral diversity. These communities characteristically are often influenced by external forces. Disturbances can create incongruencies in these communities and have been demonstrated to change community dynamics in varying ways. Humans are responsible for many disturbances which alter habitat and community structure and many habitat edges or ecotones are artificially created by these human disturbances. In Wakatobi National Park, Hoga Island, Indonesia, three bays exist and are in close proximity to one another with varying levels of human influence. This study investigated how anthropogenic …
Record Body Size For The Red Lionfish, Pterois Volitans (Scorpaeniformes), In The Southern Gulf Of Mexico,
2013
Universidad Autonoma de Yucatan, Mexico
Record Body Size For The Red Lionfish, Pterois Volitans (Scorpaeniformes), In The Southern Gulf Of Mexico, Alfonso Aguilar-Perera, Leidy Perera-Chan, Luis Quijano-Puerto
Gulf and Caribbean Research
Non-native species are those that have been transported, via human actions, from one continent and introduced into another (Lockwood et al. 2007). In the 1980s, red lionfish, Pterois volitans (Linnaeus, 1758), traded in the US aquarium industry from the Pacific Ocean, was introduced into the coral reefs off Florida's coast by aquarium hobbyists (Morris and Whitfield 2009). It is unknown how this introduction occurred, but after more than 20 years the red lionfish population is widespread, occupying a large portion of the Western Atlantic (Schofield 2010) where it represents a threat to the marine ecosystem (Green et al. 2012). The …
Time-Activity Budgets Of Stoplight Parrotfish (Scaridae: Sparisoma Viride) In Belize: Cleaning Invitation And Diurnal Patterns,
2013
University of Mississippi
Time-Activity Budgets Of Stoplight Parrotfish (Scaridae: Sparisoma Viride) In Belize: Cleaning Invitation And Diurnal Patterns, Wesley A. Dent, Gary R. Gaston
Gulf and Caribbean Research
The primary objective of this study was to analyze diurnal behavior of Sparisoma viride in South Water Caye Marine Reserve (SWCMR), Belize. Time-activity budgets were used to characterize behavior (using swimming, feeding, hovering, sheltering, defecating, and cleaning categories) during the diel cycle, and to illustrate differences among the life phases of this species.
Distribution And Length Frequency Of Invasive Lionfish (Pterois Sp.) In The Northern Gulf Of Mexico,
2013
National Marine Fisheries Service
Distribution And Length Frequency Of Invasive Lionfish (Pterois Sp.) In The Northern Gulf Of Mexico, Alexander Q. Fogg, Eric R. Hoffmayer, William B. Driggers Iii, Matthew D. Campbell, Gilmore J. Pellegrin, William Stein
Gulf and Caribbean Research
The purpose of this communication is to document continued spatial expansion of lionfish farther west into the northern Gulf of Mexico. Furthermore, we provide the first length— mass relationships and length frequency information for lionfishes captured within the northern GOM based on data collected as part of a broader on—going study of lionfish life history in this region.
Effects Of Black Mangrove (Avicennia Germinans) Expansion On Saltmarsh (Spartina Alterniflora) Benthic Communities Of The South Texas Coast,
2013
Texas A&M University, Corpus Christi
Effects Of Black Mangrove (Avicennia Germinans) Expansion On Saltmarsh (Spartina Alterniflora) Benthic Communities Of The South Texas Coast, Jessica Lunt, Kimberly Mcglaun, Elizabeth M. Robinson
Gulf and Caribbean Research
This study examined the effects of mangrove expansion on benthic communities. This was accomplished by examining plant composition, benthic community composition, and belowground root biomass. Two sites were examined: Corpus Christi Pass, Corpus Christi, TX where mangroves have become more common in the last decade and the Lower Laguna Madre, South Padre Island, TX where mangroves are well established. This research seeks to provide preliminary results to provide direction for future studies examining the interplay of S. alterniflora and A. germinans habitat on benthic communities. We hypothesize that the more established site of South Padre Island will have greater numbers …
