Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 84 for “"marine ecosystem"”.
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Towards scalable modern marine ecosystem monitoring
… and deoxygenation at unprecedented rates, while ecosystems, often represented by iconic umbrella species such as North Atlantic right whales, emperor penguins, and coral reef ecosystems, face mounting anthropogenic pressures. Addressing these data gaps requires fundamentally better ocean …
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Predictability studies of coastal marine ecosystem behavior
… Starting from the consideration that marine ecosystem behavior appears unpredictable, our scientific interest is to understand what are the intrinsic reasons of this apparent unpredictability. Without involving into strictly philosophical grounds, the unpredictability of marine …
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Marine ecosystem model analysis using data assimilation
Numerical modelling of the marine ecosystem requires the aggregation of diverse chemical and biological species into broad categories. To avoid large bias errors it is preferable to resolve as many explicit state variables and processes as possible. The cost of this increased complexity is greater …
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Defining the ecological and physiological traits of phytoplankton across marine ecosystem
Marine phytoplankton are central players in the global carbon cycle, responsible for nearly half of global primary production. The identification of the factors controlling phytoplankton ecology, physiology, and, ultimately, bloom dynamics has been a central problem in the field of biological …
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The mental demands of marine Ecosystem -based Management: A constructive developmental lens
<p>Ecosystem-based Management (EBM) is a relatively new and promising approach to the management of marine systems. EBM is holistic by seeking to include ail stakeholders affected by marine policy. Stakeholders may include individuals from ail levels of government, academia, environmental …
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Marine ecosystem classification and conservation targets within the Agulhas ecoregion, South Africa
Deep-sea benthic ecosystems remain poorly studied in South Africa, limiting understanding of community biodiversity patterns and their environmental drivers. This is one of the first studies to (i) visually investigate marine epifaunal community patterns and their environmental drivers along the …
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Organic nitrogen uptake by marine algae: consequences for marine ecosystem functioning and biodiversity
… a major pool of fixed, reactive nitrogen in marine systems. It is now recognized that this pool can support primary production and the ability of some algal species to exploit DON compounds as sources of Nitrogen (N) may indicate that specific DON components can exert selective pressure on …
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Breakwater Enhancement: Redesign Tetrapod Structures for Resilient Coastal Environments and Marine Ecosystem Rehabilitation
… for protecting coastlines and rehabilitating marine ecosystems. This research advocates for a revitalized approach to coastal defense, considering environmental and practical factors in the face of a growing global coastal crisis.
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Exploring the role of reactive oxygen species (ROS) in marine ecosystem health and function
With the rapid decline of coastal ecosystems such as coral reefs and seagrasses, it is crucial to better understand the health of these ecosystem to prevent future loss. Reactive oxygen speices (ROS), such as superoxide and hydrogen peroxide, play an underappreciated role in both organism health …
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Inter-annual and decadal variation in the pelagic marine ecosystem of the Yellow and East China seas
<p>The water-leaving radiance measurements and chlorophyll concentrations of the Coastal Zone Color Scanner (CZCS) and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) were compared to investigate decadal trends in the Yellow and East China Seas (YECS). A unified bio-optical algorithm was …
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From the ice to the open ocean : threats to phytoplankton productivity in the Antarctic marine ecosystem from a changing climate
The Antarctic marine ecosystem is unique and dynamic, changing seasonally and forming specialised niche habitats including open ocean, sea ice and meltwater environments. Phytoplankton are key species in the structure and function of the Antarctic ecosystem, instrumental in the regions …
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Challenges facing implementation of the precautionary principle in Namibian marine phosphate mining regulation
With the endorsement of the world’s first Marine Phosphate Mining (MPM) licence by the Ministry of Mines and Energy in July 2011, The Benguela Commission’s (Commission) mandate to protect and sustain the marine ecosystem is being tested.1 The interest shown by prospectors of Namibia’s continental …
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Safeguarding the deep-Sea Marine ecosystem: a critical analysis of the legal framework governing the impacts of the upstream Petroleum Sector on the deep-sea marine ecosystems and coastal communities in South Africa
… environment, home to unique and diverse marine ecosystems. However, the increasing global demand for oil and gas has led to a surge in extraction activities in the deep ocean. These activities while essential for meeting energy demands, pose significant threats to the fragile deep-sea …
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The Cape fur seal : monitoring and management in the Benguela Current ecosystem
… of this thesis was the Benguela Current Large Marine Ecosystem (BCLME) Programme’s project "Top Predators as Biological Indicators of Ecosystem Change in the BCLME" (LMR/EAF/03/02). The objectives of this project were to assess the utility of top predators as biological indicators of ecosystem …
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The influence of sampling method on detecting benthic biodiversity patterns at the ecoregion scale on the South African west coast
Long-term monitoring of marine benthic communities provides data which are essential for effective ocean management. However, long-term monitoring is limited by the difficulty and expense of sampling deep seafloor areas comprehensively enough to represent the whole benthic community. This has led …
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The perceptions of climate change among subsistence fishers in Paternoster, South Africa
… fishers who depend heavily on the fragile marine ecosystem and environment. This study looks at the experiences, perceptions and strategies concerning adapting to change of subsistence fishers in Paternoster. Paternoster is a historical coastal town on the West Coast of South Africa. The …
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Physical Control of Biological Processes in the Central Equatorial Pacific: A Data Assimilative Modeling Study
<p>A five-component data assimilative ecosystem model is developed in order to investigate the effects of physical processes encompassing a wide range of space and time scales, on the lower trophic levels of the highly dynamic central equatorial Pacific (140°W). Many of the biological processes …
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Conservation education in shark ecotourism
Sharks, as top predators, are vital a healthy marine ecosystem. Sharks regulate species abundance, distribution, and diversity, which in turn can impact the health of marine habitats. The biggest issue relating to the endangered status of many shark species is the unsustainable international trade …
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Spatio-Temporal Variation in Ringed Seal (Pusa Hispida) Density and Habitat Use in the Last Ice Area
… rapid changes in sea ice habitat on the Arctic marine ecosystem remain unknown, especially in the High Arctic where ecological research has been limited due to its remoteness. Ringed seals (Pusa hispida) are an abundant ice-associated pinniped species with a habitat range spanning the …
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