Wasserman, Ryan J, Matcher, Gwynneth F, Vink, Tim J F, Froneman, Pierre William

Publisher version / As part of a larger investigation, the effect of apex predation on estuarine bacterial community structure, through trophic cascading, was investigated using experimental in situ mesocosms. Through either the removal (filtration) or addition of specific size classes of planktonic groups, four different trophic scenarios were established using estuarine water and its associated plankton. One such treatment represented a “natural” scenario in which stable apex predatory pressur...

Zhu, Weijing, Wang, Cheng, Hill, Jaclyn Marie, He, Yangyang, Tao, Bangyi, Mao, Zhihua, Wu, Weixiang

In estuarine and coastal ecosystems, the majority of previous studies have considered coupled nitrification-denitrification (CND) processes to be exclusively sediment based, with little focus onsuspended particulate matter (SPM) in the water column. Here, we present evidence of CND processes in the water column of Hangzhou Bay, one of the largest macrotidal embayments in the world.

Tweddle, G P, Froneman, Pierre William

Publisher version / The effect of mouth status on the population structure of three endemic estuarine-spawning fish species was assessed using seine nets from November 2005 to October 2007 in the temporarily open/closed Mpekweni Estuary, Eastern Cape, South Africa. Collectively, these three species accounted for more than 60% of the total fish abundance within the estuary. Monthly length frequency data were analysed. Two species, Gilchristella aestuaria and Glossogobius callidus, displayed norma...

Patton, Brett Ashley

The wetlands of Louisiana are losing area at the rapid rate of 42.9 km2 yr-1 and the trend is expected to continue. This combined with expected sea-level rise will likely cause large shifts in vegetation and salinity regimes that will affect the wildlife species reliant on these ecosystems. Waterbirds serve as indicator species of ecosystem health in estuarine wetland habitats; therefore, these species are often the targets of wetland management goals in Louisiana. However, many proposed wetland...

Volta, Chiara

The overarching goal of this thesis is to develop a diagnostic and predictive model to quantify the estuarine CO2 dynamics across scales – from catchment to the globe – using an approach that explicitly resolves the strong physical and biogeochemical gradients typically observed in these systems.Chapter 1 provides fundamental definitions and descriptions of estuaries, as well as an assessment of their role in the global carbon cycle. It also raises the specific objectives and research questions ...

Maree, R C, Booth, Anthony John, Whitfield, A K

Estuarine biogeographical regions along the southeastern coast of South Africa were investigated in terms of fish distribution and abundance patterns, with particular emphasis on the role of water temperature in influencing these patterns. Qualitative and quantitative analyses were conducted upon the ichthyofaunal assemblages to determine whether the location of the subtropical/warm temperate boundary corresponds to that proposed by Whitfield.(n1) Analyses included the distribution ranges of spe...

Erasmus, Bernard

Although it is increasingly accepted that ocean acidification poses a considerable threat to marine organisms, little is known about the likely response of fishes to this phenomenon. While initial research concluded that adult fishes may be tolerant to changes predicted in the next 300 years, the response of early life stages to end-of-century CO2 levels (~ 1100 µatm according to the IPCC RCP 8.5) remains unclear. To date, literature on the early growth and survival of fishes has yielded conflic...

Levasseur, Maurice

In the marine environment, export production leading to the traditional food chain is a relatively rare event taking place primarily in hydrographic features such as frontal areas. When export production persists, massive reproduction of herbivores is expected to occur. Since copepod eggs and nauplii are the main prey of a majority of fish postlarvae, the spawning of dominant fish species is expected to be associated with fronts. The aims of this study were to determine the influence of an estua...

Sambrook, Robert Joseph

Threespine stickleback (Gasterosteus aculeatus) and juvenile chinook salmon (Oncorhynchus tshazvytscha) co-occur during high tide in tidal channels of the Fraser River estuary. Given the high density of resident stickleback, there is the potential for strong interactions within and between the two species. Inter- and intra-specific interactions were tested by means of laboratory experiments, with support from field studies. Laboratory experiments placed stickleback and chinook in mixed and sing...

Wu, Yong

In a laboratory microcosm, two kinds of salinity gradients were created to simulate the process occurring in estuarine circulation with mixing sea water and fresh water. The behaviour of the freshwater and seawater ecosystem components in relation to the salinity gradients were investigated. Seven parameters were chosen as indicators of the different trophic levels in the ecosystem or of the environmental conditions. The interaction among the different trophic levels was reflected in the develop...

Mesa, Kathryn A.

This study examines the effects of a low oxygen environment, in concert with fluctuating temperature and salinity conditions, on the nearshore depth distributions (0-1 m) and flood tide movements of juvenile chinook (Oncorhynchus tshawytscha) and chum (O. keta) salmon. Comparisons are made between an unpolluted and a sewage polluted estuarine intertidal flat in the Fraser River estuary, British Columbia, the polluted area being characterized by the regular occurrence of low dissolved oxygen leve...

Harrison, Brenda Jane

The abundance and microspatial distribution of harpacticoid copepods were studied from Jan 1977 to Jan 1980 at two intertidal sites on the Fraser River Delta, B.C.: one (Sand) on the crest of a sand wave and the other (Mud) on the edge of its muddy trough. Eight species formed the communities at the two sites. The composition of the communities was studied by biweekly survey in 1978. Longer term changes in the organization of the sand community were followed by annual mid-winter surveys over fo...

Vorsatz, Jeanne Pauline

Crabs are conspicuous inhabitants of temperate salt marshes and tropical mangroves and interact with their environment through several processes. However, detailed information on crab community processes is absent for most South African estuaries and nearshore coastal regions. This study evaluated the primary producers supporting crab species in the salt marsh dominated Swartkops estuary and the mangrove Mngazana estuary. Various methods estimating crab abundances were also assessed in different...

Lee, Deborah Ellen

Among the world‘s ecosystems, estuaries have the highest total economic value per hectare. They are dynamic coastal biomes that provide a host of different goods and services to the surrounding terrestrial and aquatic environments and the people who utilise them. These goods and services include, inter alia, nursery areas for marine organisms, harvested natural resources (such as fish, shell-fish, bait organisms, reeds and mangroves), flood attenuation, water purification, nutrient and sediment ...

Joshi, Ishan

Water quality is examined in two contrasting estuaries, Barataria Bay and Apalachicola Bay, in the northern Gulf of Mexico (NGOM) using in situ and satellite observations. The two estuaries considered in this study are unique - Barataria Bay represents a sediment-starved degrading system while Apalachicola Bay, a naturally intact system, is threatened by a two decade long tri-state water distribution conflict. The present state of water quality parameters, their controlling processes, and distri...

Simpson, Elizabeth Anne

Dissertation submitted in compliance with the requirements for the Master's Degree in Technology: Biotechnology, Durban Insititute of Technology, 2003. / Stimulated by the findings of international researchers, that the sulfate-reducing microorganism Desulfovibrio desulfuricans could be incriminated in the process of mercury bio-methylation, it was decided to test this hypothesis on sediments from selected areas of Durban Bay where elevated levels of the bio-hazardous heavy metal had previou...

Chaalali, Aurélie

Les estuaires font partie des écosystèmes les plus productifs de la planète. Ils constituent une zone d'importants échanges de matières et jouent à ce titre un rôle capital pour les cycles biogéochimiques. Du fait de leur position à l'interface entre domaines continental et marin, ils sont également un lieu de passage obligatoire pour de nombreuses espèces de poissons migrateurs ou encore de nourricerie et de refuge. Ces systèmes sont contraints par de nombreuses pressions de natures diverses do...

Childs, Amber-Robyn

Dusky kob Argyrosomus japonicus is a wide-ranging estuarine-dependent Sciaenid and an important fishery species throughout most of its distribution. It is one of South Africa’s most valuable coastal fishery species. High levels of juvenile exploitation in estuaries and ineffective management regulations have led to stock collapse, highlighting the need to better understand the spatial and temporal aspects of estuarine-dependency and multiple habitat use. Habitat connectivity is a critical proper...

Richardson, Naomi

The aims of this study were to determine the potential use of biomarkers at multiple levels of biological organisation together with a fish community bioindicator to assess the estuarine health status of three temporarily open/closed estuaries. The estuaries investigated were the East Kleinemonde (EK), Old Woman's (OW) and Mtana (MTN), all of which are situated in the Eastern Cape Province. Three biomarkers, the acetylcholinesterase (AChE) assay, lipid peroxidation (LPx) assay, liver histopathol...

Sjare, Becky L.

No description available.

Dumbrell, Melissa J.

No description available.

Gallagher, M. Brett.

Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 53-58). Also available on the World Wide Web.

Gallo, Thomas. Paerl, Hans W.

Thesis (M.S.)--University of North Carolina at Chapel Hill, 2006. / Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Masters of Science in the School of Public Health, Department Environmental Sciences and Engineering." Discipline: Environmental Sciences and Engineering; Department/School: Public Health.

Murphy, Jennifer Leigh. Sobsey, Mark D.

Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006. / Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Environmental Sciences and Engineering." Discipline: Environmental Sciences and Engineering; Department/School: Public Health.

LeBlanc, Caroline. Schwarcz, Henry P. Risk, Michael J.

Thesis (Ph.D.)--McMaster University (Canada), 1990. / Source: Dissertation Abstracts International, Volume: 62-13, Section: A, page: 0000.

Schwer, Patrick Thomas.

Thesis (M.S.)--University of Colorado at Boulder, 2006. / Source: Masters Abstracts International, Volume: 44-05, page: 2418. Adviser: Gary Amy.

Kelso, Kyle W.

Thesis (M.S.)--University of South Florida, 2007. / Title from PDF of title page. Document formatted into pages; contains 135 pages. Includes bibliographical references.

Pastershank, Georgine M.

No description available.

Johnson, Galen Anna. Peterson, Charles Henry.

Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006. / Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Marine Sciences." Discipline: Marine Sciences; Department/School: Marine Sciences.

Klosterhaus, Susan L.

Thesis (Ph. D.) -- University of Maryland, College Park, 2007. / Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

Wagner, Matthew Earl.

Thesis (M.S.)--University of West Florida, 2006. / Title from title page of source document. Document formatted into pages; contains 99 pages. Includes bibliographical references.

Solomon, Caroline M.

Thesis (Ph. D.) -- University of Maryland, College Park, 2006. / Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

Hyde, Nate.

Thesis (M.S.) OGI School of Science & Engineering at OHSU, June 2007. / Includes bibliographical references (leaves 136-140).

Hubeny, Jeremiah Bradford.

Thesis (Ph. D.)--University of Rhode Island, 2006. / Typescript. Includes bibliographical references (leaves 220-239).

Robinson, Michael A.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1996. / Vita. Abstract. Includes bibliographical references. Also available via the Internet.

Reay, William Glendon.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 207-235). Also available via the Internet.

Lloyd, Scott Steven.

Thesis (Ph. D.) -- University of Maryland, College Park, 2006. / Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

Truelove, Nathan Kobun.

Thesis (M.S.)--Oregon State University, 2006. / Printout. Includes bibliographical references (leaves 63-68). Also available on the World Wide Web.

Ulrich, Robert M.

Thesis (M.S.)--University of South Florida, 2004. / Title from PDF of title page. Document formatted into pages; contains 136 pages. Includes bibliographical references.

Aronhime, Barry Richard

High stress environments can reduce species diversity. How such stress-induced reduction in predator diversity impacts prey survival is less well studied. Brackish waters in estuaries are stressful, species depauperate areas, but also prime oyster habitat in Louisiana. Surveys revealed reduced bivalve predator diversity at the low salinity (high stress) site. Exclosure experiments indicated highest prey mortality at the high salinity (low stress) site. Predator enclosures corroborated the field ...

Powell, Heidi Sara

Graduation date: 1980

Roberts, Kenneth, 1944-

Graduation date: 1973

Ramm, Alan Edmund

A conceptual model of the tidal flat system, emphasizing the sulfur cycle was presented. Measurements were made of the vertical distribution within tidal flat deposits of total aerobic and sulfate reducing bacteria, total sulfides, redox potential, volatile solids, and particle size. Variations in dissolved oxygen and free sulfides in the water overlying tidal flat deposits were monitored during a tidal cycle, and profiles within this overlying water obtained. An in situ benthic respirometer was...

Thum, Alan Bradley

The distribution and abundance of the interstitial acoel turbellarian, Diatomovora amoena Kozloff, 1965 was studied in an estuarine intertidal sand flat in Yaquina Bay, Oregon, from May 1970 through May 1971. Monthly measurements of biological (organics, sulfides, chlorophyll, and carotenoids), pore water (salinity, pH,oxygen, and temperature), and sediment (fine sediment percentage, grain size, sorting, skewness, and kurtosis) factors were made along a transect at four intertidal stations with ...

Furey, Nathaniel

Southern flounder (Parlichthys lethostigma) is a recreationally and commercially important flatfish species found in the Gulf of Mexico, and recent analyses indicate that the northern Gulf of Mexico population is in decline. For proper management, knowledge of habitats used throughout the juvenile stage is needed. The aim of the current study is to examine habitat use of young-of-year (YOY) southern flounder in the Galveston Bay complex using habitat distribution models and acoustic telemetry. A...

Zach, Lorna S.

Accidental spillage of chemicals by the process industries can pose both immediate and long-term threats to the natural environment. Long-term damage from frequent, low-level releases is difficult to predict and may not be evident until the damage is done. This thesis reviews techniques for environmental risk evaluation and proposes a number of improvements. These improvements include: • Definition of an endpoint in the natural environment around which to evaluate risk; • Estimation of risk fr...

Mohajerin Haug, Tahmineh Jade

<p> This dissertation combines laboratory experiments and analysis of field samples to examine tungsten (W) geochemistry. Data from low ionic strength experimental solutions at room temperature containing between 0.01 M to 0.0002 M total sulfide and 0.0027 M - 0.0001 M tungstate were analyzed using UV/VIS spectrophotometry. Stability constants have been determined for the formation of mono-thiotungstate log K₀₁= 3.43 &plusmn; 0.61, di-thiotungstate log K₁₂ = 3.02 &plusmn; 0...

Mooney, Rae Frances, 1982-

River export has a strong influence on the productivity of coastal waters. During storm events, rivers deliver disproportionate amounts of nutrients and organic matter to estuaries. Anthropogenic changes to the land use/cover (LULC) and water use also have a strong influence on the export of nutrients and organic matter to estuaries. This study specifically addressed the following questions: 1) How does river water chemistry vary across LULC patterns in the Mission and Aransas river watersheds? ...

Chen, Xiwei, 陈希玮

published_or_final_version / Architecture / Master / Master of Landscape Architecture

Fernández Méndez, Pablo

El impacto acelerado de las actividades humanas está causando el aumento de los daños a los sistemas de soporte vital de la Tierra. En consecuencia, la necesidad de un cambio hacia el uso sostenible de los recursos naturales y los ecosistemas se ha defendido como una necesidad urgente por científicos y tomadores de decisiones. Esta tesis trata sobre las condiciones institucionales necesarias para dicho cambio en sistemas socio-ecológicos, a través de un estudio de caso en profundidad: la región ...