Amaya, Carlos Alberto

Orito Field occupies an area of 31 mi² (80 km²) in the west-central portion of the Putumayo Basin, Colombia and forms part of an extensive littoral system that dominated sedimentation during Albian-Aptian time. The Caballos Formation represents the oldest Cretaceous unit, and was deposited at the beginning of a retrogradational episode immediately above the eroded Triassic-Jurassic surface. The Caballos Formation has an average thickness of 240 ft (73 m) and is largely composed of fine grained, ...

Carroll, Brett Ian

ABSTRACT This work examined the role of micro-organisms in the biogeochemical cycling of selenium within the benthic ecosystem of Lake Macquarie, a coastal lake in New South Wales with a history of anthropogenic heavy metal contamination. Certain micro-organisms possess the ability to oxidise or reduce selenium (Fleming and Alexander, 1973; Doran and Alexander, 1977), and microbial volatilisation of selenium from contaminated sediments and soils utilising naturally-occurring microflora has b...

Nel, Holly Astrid.

The St Lucia estuarine system, Africa’s largest estuarine lake, is characterised by cyclic changes from hypersaline to oligo/mesohaline conditions in response to alternations between drought and wetter than average years. In addition, St Lucia also experiences stochastic disturbances, such as flooding events that rapidly decrease salinity levels. Due to their sessile and slow moving nature, bivalves are particularly vulnerable to rapid or prolonged changes in the physico-chemical environment. Th...

Dyer, David Clifford.

Among the 155 species of fish recorded so far in the St Lucia estuarine lake, Oreochromis mossambicus and Ambassis ambassis are the two most prominent. Although originally endemic to southern Africa, O. mossambicus is now one of the most widely distributed exotic fish species worldwide. Together with A. ambassis, they have become the dominant fish species in the St Lucia estuarine lake since the closure of the mouth in 2002 and are, therefore, a crucial component of the food webs throughout the ...

Atagi, Dana Yutaka

Across its geographic distribution in North America and Eurasia, juvenile coho salmon (Oncorhynchus kisutch) utilize an array of different freshwater habitats prior to moving seaward. These freshwater habitats include streams, lakes, beaver ponds, and off-channel sites. In recent years, pre-smolt juvenile coho salmon use of other habitats such as estuaries has been documented. This finding raises the question of whether or not estuarine use by pre-smolt coho salmon is a viable alternative ...

Riche, Olivier

During 2002–2006, a comprehensive set of observations covering physical, biological, radiative and atmospheric parameters was obtained from the southern Strait of Georgia (SoG), Western Canada by the STRATOGEM program. Monthly time series of estuarine layer transports over 2002–2005 were estimated using a time-dependent 2-box model in a formal inverse approach. These transports are then consistent with the temperature and salinity fields, as well as riverine freshwater inflow (R) and atmospheric...

James, Nicola Caroline.

Acanthopagrus berda is an estuarine-dependent fish species which is widespread in the tropical Indo-Pacific. In South Africa, it is particularly abundant in the three large northern KwaZulu-Natal estuarine systems, namely Kosi Bay, St Lucia and Richards Bay. In these systems, A. berda is harvested by a variety of methods, including traditional fish traps, gillnets and hook and line. The importance of A. berda to the different fisheries was evaluated by analysing all the available monitoring dat...

Filipa Alexandra dos Santos

No description available.

João Filipe Rodrigues Pereira Santos

No description available.

Wheeler, Joseph H.

Master of Architecture

Qin, Qubin.

The classical theory of estuarine dynamics has been challenged by a number of recent studies regarding the important contributions of tidal, lateral, and Coriolis effects to the subtidal dynamics at leading order. Although the classical theory excluded these processes, Hansen and Rattray’ ( R65) b subtidal circulation. However, the success of the predictive skill is not well understood. In this thesis, a perturbation approach is introduced to derive a “ ” (GS) of subtidal along-channel velocity ...

Williams, Branson D.

Detectability, the probability that a species is encountered if it inhabits a site, is often overlooked in fisheries research despite its potential to obscure habitat use inferences. Detectability can be estimated using models that also provide an estimate of occupancy (Ψ), the probability that a species inhabits a site. I used these models to estimate both probabilities, and to examine factors affecting detectability and occupancy for three fishes in Chesapeake Bay tributaries: young-of-the-yea...

Qin, Qubin

The spatial and temporal variability of phytoplankton biomass in estuaries is determined by both local processes and transport processes. Local processes include biological processes (e.g., photosynthesis, respiration/excretion, and grazing) and settling, whereas transport processes include advective and diffusive transports. Transport processes have been demonstrated to regulate phytoplankton dynamics significantly by distributing both phytoplankton and other dissolved and particulate substance...

Gundersen, Jennifer Lisa

Chloroguaiacols are common components of bleached kraft pulp mill effluent known to bioaccumulate in aquatic organisms, and sorb onto particulate material and sediments. Ionization properties of the chloroguaiacols must be known in order to explain their sorptive behavior in aquatic systems. to obtain this information, thermodynamic acid dissociation constants (p&K\sb{lcub}\rm a{rcub})& of guaiacol (o-methoxyphenol) and nine chloroguaiacols have been determined by spectrophotometric methods. The...

Koepfler, Eric Thor

Section 1. Ecotoxicological effects of creosote contamination on benthic bacterial communities in the Elizabeth River, Virginia were investigated using both structural and functional microbial parameters. Results indicated that cell specific and total heterotrophic bacterial production parameters were depressed in a dose dependent manner with increasing sediment PAH concentrations. Toxicity effects upon production were modified by temporal trends associated with temperature as well as spatial se...

Hinchey, Elizabeth K.

No description available.

Mitra, Siddhartha

Sediments and pore waters from two urban estuaries ranging in sediment mixing energy were studied to evaluate the potential release of contaminants from particles during sediment diagenesis. Two sites in Elizabeth River, VA and two tributaries in the Hudson River Watershed were sampled for polycyclic aromatic hydrocarbons (PAHs). Sediment age, total sediment organic carbon (TOC), carbon to nitrogen (C/N) ratios, and particle surface area (SA) were also sampled at these sites. In the Elizabeth Ri...

Muller, Terri A.

No description available.

Chen, Jia

No description available.

Orzech, Mary Ann Terese

No description available.

Unkulvasapaul, Yothin

A one dimensional finite element model for the prediction of transient water quality in an estuary is developed. Ten water quality constituents, salinity, coliform bacteria, organic nitrogen, ammonia nitrogen, nitrite-nitrate nitrogen, organic phosphorous, inorganic phosphorous, phytoplankton as measured by chlorophyll 'a', DO and CBOD are included in the model. The effects of temperature, solar radiation and zooplankton predation are incorporated into the model as external forcing functions. Th...

Garrison, Lance Preston

In estuarine crabs, there is a gradient of larval dispersal from retention within hatching habitats to export to the continental shelf. This dissertation examined the influence of physical transport and nutritional stress on recruitment success in species with different larval dispersal. In the first chapter, I examined larval vertical migration. Larvae from different families exhibited different tidally and light driven behaviors. The role of transport in selecting behaviors is associated with ...

Gallagher, Kathryn

Aroclor 5432, a mixture of polychlorinated terphenyls (PCT), was detected in sediment and several biological compartments including: saltmarsh cordgrass (Spartina alterniflora), American oysters (Crassostrea virginica), red-jointed fiddler crabs (Uca minax), wharf crabs (Sesarma reticulatum) and mummichogs (Fundulus heteroclitus) collected from Tabbs Creek. This tidal creek is located in the southern Chesapeake Bay region. Species from several phyla were selected in order to examine PCT accumula...

Amon, James P.

No description available.

Although many researchers have examined the phenomenon of intertidal zonation and its structuring processes in rocky habitats, similar studies concerning soft-bottom habitats are relatively uncommon. The bivalve assemblage of Polymesoda caroliniana (Corbiculidae) and Rangia cuneata (Mactridae), common in the shallow subtidal and intertidal zones of the mesohaline-oligohaline regions of southeastern United States estuaries, allows some analogies to previously studied rocky intertidal communities ...

Liang, Andrea Yankee

Includes bibliographical references. / The impact of flamingo predation on the benthic community has been well researched through the use of caging and exclusion experiments. However, there is still very little known about flamingo spatial foraging preferences and the environmental cues that determine them. The purpose of this study was to investigate the foraging distributions of non-breeding Greater Flamingos (Phoenicopterus ruber roseus) within one of their southern African overwintering grou...

Van Niekerk, Lara

Thesis (MSc (Geography and Environmental Studies))--University of Stellenbosch, 2007. / In South Africa, as a result of limited resources and capacity, the governance and management of estuaries occur on an ad hoc basis, with decisions about an estuary’s freshwater-flow requirements, water quality, living-resources management, mouth management and protection status being made on a largely uncoordinated and non-strategic basis. This study is aimed at developing an understanding of the opportun...

Johnson, Jeremiah

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 62-69). Description: viii, 68 leaves : ill. ; 29 cm.

Wasserman, Ryan J, Kramer, Rachel, Vink, Tim J F, Froneman, Pierre William

Publisher version / Sensitivity to chemical cues associated with predation threat has been well observed in many freshwater zooplankters, yet few studies have highlighted such sensitivity in eury- and stenohaline metazoans. We aimed to assess sensitivity to conspecific chemical alarm cues in the estuarine copepod, Paracartia longipatella. Alarm cues associated with predation have been shown to have population level effects on certain zooplanktonic species. As such, we assessed the occurrence of ...

Lindsey, Jacqueline Kimberly

<p> As the southern sea otter (<i>Enhydra lutris nereis</i>) range expands into northern and southern California, it will encounter estuaries that have been historically occupied by sea otters. Understanding how otters use re-colonized estuarine environments will inform how estuaries might be managed to encourage future sea otter range expansion. This project addressed the question: how do southern sea otters use space in the unique estuarine habitats of Elkhorn Slough? I compared the locations ...

Veldkornet, Dimitri Allastair

Studies on morphological variation are important as it can depict the relationship with environmental factors clearly and convey an understanding of the manner, mechanism and factors influencing plant adaptation and evolution. Although many studies have been conducted on South African salt marsh plant physiology and phytosociology there are at present very few morphological studies on estuarine plants. The aim of this study was to compare the morphological variation of estuarine macrophytes in t...

Cilliers, Gerhard Jordaan

Adaptive water resource management requires sound scientific based decisions, emanating from robust scientific data. The Department of Environmental Affairs are mandated for collaborative management of the South African coast, including estuaries, through the Integrated Coastal Management Act (Act no 24 of 2008) (ICMA). The Department Water and Sanitation is mandated through the National Water Act (Act no 36 of 1998) (NWA) to design, test and implement monitoring programmes to provide water reso...

Chang, B. D.

Factors affecting the distribution and productivity of the benthic estuarine amphipod Anisogammarus pugettensis (Dana) were examined. Data were obtained from field samples taken from Crescent Beach, British Columbia, between May 1973 and September 1974. Tolerances to selected physical factors, growth rates, oxygen uptake, and assimilation efficiency were measured in the laboratory. This species is present and appears to reproduce throughout the year at Crescent Beach. Distribution is affected by...

Wootton, Louise Sarah

Large amounts of particulate material were found to flocculate from water collected from local, organic rich streams upon addition of salt water. This material was found to compose approximately 50% humic substances and to have a C:N ratio of about 50:1. Feeding studies using floe having various degrees of bacterial colonisation showed that bacterial abundance was an important determinant of the palatability of this material to the copepod grazer, Tigriopus californicus. Palatability of floccula...

Forbes, Donald Lawrence

Inputs, transfer processes, and storage characteristics of water and sediment have been investigated in a 40-km² estuarine system on the central Yukon coast. The setting is transgressive, microtidal, and high-latitude (69°N). The Babbage Estuary system can be subdivided into fluvial, tidal-distributary, delta-plain, intertidal, lagoon, marginal-supratidal, and barrier subsystems, each associated with one or more distinctive depositional environments and characteristic lithofacies assemblages. Th...

Sharp, Joan Catherine

The gammarid amphipod Eogammarus confervicolus (Stimpson) was investigated as a potential mass culture organism, with utility as a diet supplement for artificially reared fish. Suitable conditions for large-scale culture were determined in a series of experiments. E. confervicolus demonstrated wide salinity and temperature tolerances, with best survival at low salinities (5 - 10⁰/00) and temperatures (5⁰ - 10⁰C). Population densities greater than 2 mg/1 reduced amphipod growth and survival, alth...

Hawke, Scott Dransfield

Weight-specific oxygen consumption of midgut gland tissue of Hemigrapsus nudus has been investigated at three levels of salinity (35%, 75% and 125% sea water), two levels of experimental temperature (5°C and 20°C) and four acute (Warburg) temperatures (5°, 10°, 15° and 20°C) in all combinations for each season (summer and winter). Metabolic-temperature curves reveal that at standard baseline conditions where the animals are held 24 hr at their respective seasonal temperature and salinity, midgu...

Hobson, Robert Douglas

The Fraser estuarine area is characterized by an abundance of biophysical resources interacting with high levels of human demand for food, recreation, transportation, industrial location, and other uses. Our society frequently relies on the market to allocate resources in a socially optimal fashion. But for estuarine resources this approach is often inadequate because externalities from resource uses are not considered, or because a competitive market is not operative. In such cases government i...

Schade, Frieda Marion

This thesis analyses a problem that is common in planning for conservacy areas — the problem of the meeting dual and contradictory objectives of preserving natural areas that must also be used for recreation. Where one objective excludes the other, a compromise must be reached. Previous experience in North America has shown that it is not easy to reconcile the two functions. A case study approach is used in the thesis. The study area, Boundary Bay, is an important waterfowl and shore-bird habi...

Snow, Gavin Charles

The ecologist Garrett Hardin (1968) introduced a useful concept called the tragedy of the commons, which describes how ecological resources become threatened or lost. The term “commons” is based on the commons of old English villages and is symbolic of a resource that is shared by a group of people. If every person were to use each resource in a sustainable fashion it would be available in perpetuity. However, if people use more than their share they would only increase their personal wealth to ...

Kaambo, Eveline

Magister Scientiae - MSc / A study of the microbial diversity in sediments of the Great Berg River estuary is carried out using modern molecular phylogenetic methods. The aim of this study was to determine the effect of (pollution by) the effluents of the fish industry on the composition of the microbial community in the sediments. The diversity in microbial groups of sediment samples that received wastewater from the local fishing industry was investigated by a PCR-DGGE (polymerase chain reacti...

Warren, Stephanie Judith

Extracted from Summary, p. 172. The semi-terrestrial grapsoid crabs Cyclograpsus punctatus and Sesarma catenata have been studied in two ways. Part I of this thesis gives an account of their distribution in the Kowie River estuary in relation to certain environmental factors. Part II deals with further aspects of their biology as well as the ecological relationship between the two species.

Wasserman, Ryan John

Although predation has been identified as a potentially important driver in terrestrial and freshwater ecosystems, estuarine planktonic research has focused largely on the so-called "bottom-up" drivers of community assemblages. As such, this thesis focuses on the direct and indirect effects of zooplanktivorous predators on the planktonic community in an estuarine environment. By using a suite of in situ mesocosm experiments, a number of hypotheses, pertaining to the major research themes associa...

Tinmouth, Neil.

The funnel-shaped Mgeni Estuary, at the mouth of the fourth largest river along the KwaZulu- Natal coast, discharges into the Indian Ocean in the northern suburbs of Durban. This system is under considerable anthropogenic stress associated with modern development and industrialisation, both adjacent to the estuary and in the catchment area. The construction of Inanda Dam in 1989, immediately upstream of the estuary, is considered to have had an irreversible impact on the system and the estuary a...

Wortmann, Joanne.

Increased abstraction of water in the catchment results in a reduced or altered pattern of river flow and this holds serious consequences for the downstream estuarine ecosystem. In South Africa this is a serious concern because freshwater is in limited supply and the demand for freshwater can be expected to increase in the future. A large multi-disciplinary consortium of South African scientists are working on projects to determine the freshwater requirements of estuarine ecosystems. As part of ...

Dove, Michael Colin.

Thesis (Ph. D.)--University of New South Wales, 2003. / Also available online.

Unrein, Kevin Scott.

Thesis (M.S.)--Kansas State University, 2007. / Title from electronic thesis title page. Includes bibliographical references.

Houtz, Erika.

Thesis (Honors)--Ohio State University, 2007. / Title from first page of PDF file. Document formatted into pages: contains iii, 24 p.; also includes graphics. Includes bibliographical references (p. 32-24). Available online via Ohio State University's Knowledge Bank.

Hunt, Laura R.

Thesis (Ph.D.) -- Clemson University, 2007. / Title from first page of PDF file. Document formatted into pages; contains xiv, 94 p. ; also includes graphics (chiefly col.).

Garrison, Lance Preston,

Thesis (Ph. D.)--College of William and Mary. / Typescript (photocopy). Vita. Includes bibliographical references (leaves 231-240).