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 98 for “"seagrass"”.
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Interactive effects of temperature and grazing by seagrass limpets (Siphonaria compressa and Fissurella mutabilis) on seagrass (Zostera capensis)
… on marine ecosystems predicted around the world. Seagrass ecosystems are a good example of vital ecosystems that are threatened by climate change and other anthropogenic factors. A decline in global seagrass cover of 29% has been estimated over the last century, and at a local level, cover of the …
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Carbon storage and preservation in seagrass meadows
Seagrass meadows are important ‘Blue Carbon’ sinks but many questions remain unaddressed in regards to the organic carbon (OC) sequestration capacity and processes leading to retention and persistence of OC in seagrass sediments. The research summarised in this dissertation examined 37 sediment …
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Turbulence structure of a model seagrass meadow
A laboratory study of the hydrodynamics of a seagrass meadow was conducted to investigate the effect of water depth and velocity variations during a tidal cycle on the mean and turbulent velocity fields in and above the vegetation layer. The principal goal was to characterize the turbulence …
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Tropicalisation of temperate seagrass meadows in Western Australia: Predicting the impact of tropical herbivorous fishes on temperate seagrass meadows
… expansion of tropical herbivores into temperate seagrass meadows is predicted to increase grazing pressure and alter ecosystem services and processes in these seagrass systems. This study attempted to examine the effects of tropicalisation on temperate seagrass meadows along the western coast of …
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Seagrass Carbon Standing Stock in the Northern Gulf of Mexico: The Role of Seagrass Beds in Mississippi as Potential Blue Carbon Sinks
… in marine ecosystems is known as blue carbon. Seagrass beds have the ability to contribute to global blue carbon standing stocks through the uptake and sequestration of carbon from the water column. Through coastal management and conservation best practices, blue carbon habitats have the …
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Sediment-effects on seagrass Zostera muelleri in New Zealand
Seagrasses are ecosystem engineers that provide important ecological functions and societal economic values. Examples of the services that seagrasses provide are: sediment and coastal stability; maintenance of water quality; primary productivity for coastal ecosystems; fisheries nursery habitat; …
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Roots adhesion processes in the Mediterranean seagrass Posidonia oceanica
… for restoration. This endemic Mediterranean seagrass delivers key ecosystem services, including carbon sequestration, sediment stabilization, and biodiversity support, yet its meadows have declined due to multiple stressors. Restoration remains limited by slow growth and poor understanding of …
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Exploring connections between seagrass ecosystem services and meadow hydrodynamics
Meadows of aquatic vegetation, such as seagrass, modify the flow of water and transport of sediment in the environment. The hydrodynamic drag generated by a seagrass meadow contributes to the numerous ecosystem services it provides, which includes quiescent habitat for other species, wave damping, …
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Ecological Process in Pattern Generation in Tropical Coral-Seagrass Reefscapes
… patches that separate the corals from the darker seagrass or algal beds around them. Halos and similar patterns present an opportunity to examine the interactions of reef-dwelling organisms at multiple spatial scales, from benthic primary producers to macrograzers and the predators that prey on …
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Evaluating the Role of Habitat Complexity in Structuring Seagrass Communities
Biogenic coastal habitats such as salt marshes, seagrasses, and oyster reefs, support diverse faunal communities and can serve as nursery areas by enhancing the abundance, growth, and survival of juvenile fish and crustaceans. The structure and complexity of these biogenic habitats can strongly …
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Deep learning-based seagrass detection and classification from underwater digital images
… rapidly become a method of choice for analysing seagrass image data. Deep learning-based seagrass classification and detection are very challenging due to the limited labelled data, intraclass similarities between species, lighting conditions, and complex shapes and structures in the underwater …
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Intertidal Seagrass Meadows in South West England: The Ecology of Expansion
… from unvegetated mudflats to dense perennial seagrass habitat. Yet despite the increasing prevalence of intertidal seagrass meadows in the South West, there are large knowledge gaps relating to intertidal meadow biodiversity, function and ecosystem service provision, particularly within the …
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Seagrass-Mediated Carbonate Dissolution and Early Diagenesis in Bahamas Bank Sediments
… the results of studies examining the role that seagrasses play in carbonate dissolution and early diagenesis of Bahamas Bank sediments. Three aspects of this problem are addressed: (1) stable carbon isotopes as an indicator of early diagenesis of carbonates, using results of a field study; (2) …
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The influence of current and ripple development on seagrass transplant survival
Seagrass restorations have been conducted globally but with low overall survival rates. To investigate the role of hydrodynamic energy from tidal currents in the survival of newly transplanted seagrass, Zostera marina rhizome fragments with living shoots were transplanted into a sediment bed and …
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Establishment of ecological functions in transplanted meadows of the seagrass Posidonia australis
Seagrass restoration programmes are becoming increasingly important in helping to maintain the biodiversity of coastal systems in many parts of the world, due to large areas of seagrass being lost over the last 50 years. The success of any restoration programme should ultimately be based on …
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Characterising responses of the seagrass Posidonia Sinuosa to changes in light availability
The unrelenting threat of seagrass loss resulting from reduced light availability has motivated this characterisation of responses of Posidonia sinuosa Cambridge et Kuo to light availability and their application as monitoring tools. The study comprised of three major components: an assessment of …
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Assessing biofilm and epiphytes on seagrass leaves as bioindicators of environmental change
Seagrasses are highly valued for their productivity and ecosystem services. Despite their importance, seagrasses are declining globally, with losses comparable to tropical rainforests and coral reef ecosystems. Eutrophication and light reduction are two major environmental pressures contributing to …
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Molecular and physiological investigation of trace metal stress in seagrass, Zostera muelleri
… little is known about the toxicity responses of seagrasses to such perturbations. Understanding seagrass responses at the molecular level will ensure adequate conservation strategies to mitigate the increasing decline rate of seagrasses as a result of climate change and anthropogenic driven …
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Trophic dynamics in Australian seagrass beds : unravelling linkages from nutrients to fish
… juvenile fish, and piscivorous fish) in seagrass habitats. Large-scale mensurative field experiments were combined with manipulative experiments to gain an improved understanding of changes in biomass and community structure of trophic levels under different nutrient loading and to …
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Effects of Posidonia oceanica seagrass on nearshore waves and wave-induced flows.
… on the effects of the large Mediterranean seagrass Posidonia oceanica on coastal waves and wave-induced flows, which has significant implications for coastal protection. Investigations were made on both a natural shallow Posidonia oceanica bed and, in controlled conditions of full-scale …
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