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Articles 151 - 166 of 166
Full-Text Articles in Life Sciences
Dynamics And Composition Of The Extracellular Polymeric Substances Produced By Benthic Microalgae: An In Situ 13c And 15n Approach, Stephanie Kara Salisbury
Dynamics And Composition Of The Extracellular Polymeric Substances Produced By Benthic Microalgae: An In Situ 13c And 15n Approach, Stephanie Kara Salisbury
Dissertations, Theses, and Masters Projects
The land-‐ocean margin is characterized by a shallow water column, which allows light to reach the benthos and supports a diverse community of benthic autotrophs. One group of benthic autotrophs, consisting of benthic diatoms, cyanobacteria and other photosynthetic microorganisms living near the sediment surface (i.e., benthic microalgae) accounts for a substantial amount of this primary production. Benthic microalgae are also tightly coupled to carbon and nutrient cycling processes carried out by the sediment bacterial community. Benthic microalgae exude complex biopolymers, called extracellular polymeric substances (EPS), which consist mainly of carbohydrates, but can contain proteins and nucleic acids. EPS serves multiple …
Ecological, Physiological, And Bio-Optical Characteristics Of Phaeocystis Globosa In Coastal Waters Of South Central Vietnam, Xiao Liu
Dissertations, Theses, and Masters Projects
No abstract provided.
Basal Food Web Dynamics In A Natural Eelgrass (Zostera Marina) Community: Cage-Free Field Experimentation, Matthew A. Whalen
Basal Food Web Dynamics In A Natural Eelgrass (Zostera Marina) Community: Cage-Free Field Experimentation, Matthew A. Whalen
Dissertations, Theses, and Masters Projects
The relative strength of bottom-up and top-down processes operating within food webs is a fundamental determinant of community structure and function. In marine systems, inconspicuous but often highly abundant invertebrate herbivores (mesograzers) are implicated as strong consumers of primary production and important prey for higher-order consumers. Because of their small size, however, mesograzer abundance is not easily manipulated in the field, which limits our ability to adequately assess their grazing impacts. Seagrass systems present a pressing need for the study of food web dynamics because anthropogenic nutrient and sediment inputs decrease the amount of light reaching seagrass leaves, which limits …
Deep-Pelagic (0-3000m) Fish Assemblage Structure Over The Mid-Atlantic Ridge In The Area Of The Charlie-Gibbs Fracture Zone, April B. Cook
Deep-Pelagic (0-3000m) Fish Assemblage Structure Over The Mid-Atlantic Ridge In The Area Of The Charlie-Gibbs Fracture Zone, April B. Cook
Dissertations, Theses, and Masters Projects
Only a miniscule fraction of the world’s largest volume of living space, the ocean’s mid-water biome, has ever been sampled. As part of the International Census of Marine Life field project Mid-Atlantic Ridge Ecosystems (MAR-ECO), a discrete-depth trawling survey was conducted in 2009 aboard the NOAA ship Henry B. Bigelow to examine the pelagic faunal assemblage structure and distribution over the Charlie-Gibbs Fracture Zone (CGFZ) of the northern Mid-Atlantic Ridge. This is the first MAR-ECO project aimed specifically at describing diel vertical migration as a distributional phenomenon. Discrete-depth sampling from 0-3000 m was conducted during both day and night in …
A Tale Of Two Blooms: Dynamics Of Nitrogen Uptake By Harmful Algae In The Eastern Gulf Of Mexico And York River, Virginia, Usa, Lynn M. Killberg-Thoreson
A Tale Of Two Blooms: Dynamics Of Nitrogen Uptake By Harmful Algae In The Eastern Gulf Of Mexico And York River, Virginia, Usa, Lynn M. Killberg-Thoreson
Dissertations, Theses, and Masters Projects
The goal of this study was to determine the significance of dissolved inorganic nitrogen (DIN) and dissolved organic nitrogen (DON) to harmful phytoplankton. Two regions that experience frequent and persistent harmful algal blooms (HABs) were examined, the Eastern Gulf of Mexico and York River, Virginia. Nitrogen uptake by harmful algae in these regions was examined using a combination of stable isotopic (15N) tracer techniques and nutrient bioassays. In the Eastern Gulf of Mexico, kinetic parameters for uptake of N substrates by K. brevis were determined and indicated the greatest preference for ammonium (NH4+), although all substrates tested were taken up. …
Distribution And Abundance Of Introduced Fishes In Florida's Charlotte Harbor Estuary, Charles F. Idelberger, Christopher J. Stafford, Sarah E. Erickson
Distribution And Abundance Of Introduced Fishes In Florida's Charlotte Harbor Estuary, Charles F. Idelberger, Christopher J. Stafford, Sarah E. Erickson
Gulf and Caribbean Research
A growing number of non-native fishes have been introduced into Florida waters in recent years, yet little information has been available on their distribution and abundance in southwest Florida. The ichthyofauna of the Charlotte Harbor estuary, Florida, was intensively sampled from 1989 through 2007. We collected eight introduced fish taxa: African jewelfish (Hemichromis letourneuxi), blue tilapia (Oreochromis aureus), brown hoplo (Hoplosternum littorale), grass carp (Ctenopharyngodon idella), Mayan cichlid (Cichlasoma urophthalmus), sailfin catfishes (Pterygoplichthys spp.), spotted tilapia (Tilapia mariae), and walking catfish (Clarias batrachus). These fishes …
Caribbean Leucothoidae (Crustacea: Amphipoda) Of Panama, Kristine N. White
Caribbean Leucothoidae (Crustacea: Amphipoda) Of Panama, Kristine N. White
Gulf and Caribbean Research
Leucothoid amphipods were collected from sponge, ascidian, and bivalve mollusk hosts around Bocas del Toro, Panama. New host and locality records are reported for 10 species. Morphological variation is noted in some species originally described from Belize and South Florida. Future molecular research will help to clarify the importance of this variation. A key to the Caribbean species of the Leucothoidae collected around Bocas del Toro, Panama is provided based on morphological characters.
Odd Association And Range Extension Of Caligus Rufimaculatus Wilson, 1905; Caligidae, Siphonostomatoida, Copepoda, G.W. Benz, E.C. Greiner, S.R. Bowen, L. Goetz, N. Evou
Odd Association And Range Extension Of Caligus Rufimaculatus Wilson, 1905; Caligidae, Siphonostomatoida, Copepoda, G.W. Benz, E.C. Greiner, S.R. Bowen, L. Goetz, N. Evou
Gulf and Caribbean Research
The Caligidae (Siphonostomatoida, Copepoda) comprises more than 465 parasitic species, over 250 of which belong to Caligus Müller, 1785 (Boxshall and Halsey 2004). Caligus spp. are primarily marine; but some representatives routinely inhabit brackish or fresh water (Margolis et al. 1975). Some Caligus spp. have been widely reported from several oceans, others have been documented from a single location, and a few have only been collected as free-swimming individuals not associated with a host (Margolis et al. 1975). Caligus spp. range from being stenoxenous to euryxenous, with most species infecting actinopterygians (Actinopterygii), a much smaller group exclusively or non-exclusively infecting …
Observations At A Multispecies Parrotfish (Scaridae) Spawning Aggregation Site At Bermuda With Notes On The Predation Behavior Of Black Grouper (Mycteroperca Bonaci), Brian E. Luckhurst
Observations At A Multispecies Parrotfish (Scaridae) Spawning Aggregation Site At Bermuda With Notes On The Predation Behavior Of Black Grouper (Mycteroperca Bonaci), Brian E. Luckhurst
Gulf and Caribbean Research
The objective of the present study was to describe the spawning behavior of three different species of parrotfishes at the same spawning aggregation site with detailed timing sequences. In addition, observations of other species known to form resident spawning aggregations (i.e., surgeonfishes) and the predatory behavior of black grouper (Mycteroperca bonaci) at this aggregation site are included.
Evaluating Methods For Optimizing Classification Success From Otolith Tracers For Spotted Seatrout (Cynoscion Nebulosus) In The Chesapeake Bay, Stacy Kavita Beharry
Evaluating Methods For Optimizing Classification Success From Otolith Tracers For Spotted Seatrout (Cynoscion Nebulosus) In The Chesapeake Bay, Stacy Kavita Beharry
OES Theses and Dissertations
Identifying the natal sources of fish is an important step in understanding its population dynamics. Adult recruits are often sourced from multiple nursery areas, with good quality locations contributing disproportionately more fish to the adult stock. Because population persistence is strongly influenced by nursery habitat, methods that correctly identify the source of recruits are necessary for effective management. Within the last decade, otolith chemistry signatures have been increasingly used as a natural marker to delineate fish from a mixture of nursery sources. Despite the widespread use of otolith trace element and stable isotope ratios as habitat markers, the statistical approaches …
Vectoring Algal Toxin In Marine Planktonic Food Webs: Sorting Out Nutritional Deficiency From Toxicity Effects, Amy K. (Amy Keita) Burgess
Vectoring Algal Toxin In Marine Planktonic Food Webs: Sorting Out Nutritional Deficiency From Toxicity Effects, Amy K. (Amy Keita) Burgess
WWU Graduate School Collection
The present study determined whether increased mortality and delayed development of larval crabs fed heterotrophic prey that themselves have been fed toxin-containing algae is due to toxicity effects or nutritional deficiency. The effects on larval crabs of previous exposure to heterotrophic prey fed toxin-containing algae were examined. Effects of varying length of exposure of larvae to toxin-containing prey were also examined. The rotifer Brachionus plicatilis was used as a heterotrophic prey source for three larval crab species (Lophopanopeus bellus, Metacarcinus magister, and Glebocarcinus oregonensis). Two rotifer treatments were created, one of rotifers fed a toxin-containing alga (Alexandrium andersoni or A. …
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia., Ahmed Mustafa, Brittany Byerley, Paul Mccain
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia., Ahmed Mustafa, Brittany Byerley, Paul Mccain
Ahmed Mustafa Dr.
No abstract provided.
Effects Of Dietary Supplementation Of The Acidifier Vitoxal-Mionix On Growth, Survival, Immune Response And Gut Microbiota Of The Pacific White Shrimp, Litopenaeus Vannamei, Ahmed Mustafa, Davies Anuta, Alehandro Buentello, Susmita Patnaik, Addison Lawrence, Michaele Hume, Delbert Gatlin, Maurice Kemp
Effects Of Dietary Supplementation Of The Acidifier Vitoxal-Mionix On Growth, Survival, Immune Response And Gut Microbiota Of The Pacific White Shrimp, Litopenaeus Vannamei, Ahmed Mustafa, Davies Anuta, Alehandro Buentello, Susmita Patnaik, Addison Lawrence, Michaele Hume, Delbert Gatlin, Maurice Kemp
Ahmed Mustafa Dr.
No abstract provided.
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia., Ahmed Mustafa, Brittany Byerley, Hasina Karki
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia., Ahmed Mustafa, Brittany Byerley, Hasina Karki
Ahmed Mustafa Dr.
No abstract provided.
Feasibility Of Farming Nile Tilapia, Oreochromis Niloticus (L.), In Suboptimal Water Temperature, Ahmed Mustafa, Laura Randolph, Shree Dhawale
Feasibility Of Farming Nile Tilapia, Oreochromis Niloticus (L.), In Suboptimal Water Temperature, Ahmed Mustafa, Laura Randolph, Shree Dhawale
Ahmed Mustafa Dr.
No abstract provided.
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia, Ahmed Mustafa, Brittany Byerley, Paul Mccain
Effects Of Indian Herbs On The Modulation Of Stress And Immune Response In Tilapia, Ahmed Mustafa, Brittany Byerley, Paul Mccain
Ahmed Mustafa Dr.
No abstract provided.