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 13 of 13 for “"Microphytobenthos"”.
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The environmental and photo-physiological control of microphytobenthos primary production on an intertidal mudflat
Microphytobenthos are important primary producers on tidal flats - ecosystems which are characterised by steep physical and chemical gradients. In this study some of the environmental factors that control the distribution and primary production of benthic microalgae were investigated in a series of …
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Microphytobenthos (MPB) biomass variability and sediment- water column exchanges on an intertidal flat: Influence of weather-related abiotic factors across neap-spring-neap tidal cycles
The spatio-temporal distribution of microphytobenthos (MPB) on the sediment surfaces during emersions and suspended in water column during immersions was investigated on transects across Fingringhoe Tidal Flat in Colne estuary, on three zones: the mud flat, the transition zone and the salt marsh. …
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Benthic and Planktonic Microalgal Community Structure and Primary Productivity in Lower Chesapeake Bay
… ecosystem is understood, but the contribution of microphytobenthos remains unclear. This project surveys intertidal microphytobenthic communities, in relation to phytoplankton communities, around lower Chesapeake Bay describing the taxonomic makeup of these populations, coupled with quantification …
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The influence of macrofauna on intertidal sediment stability and biogeochemical properties.
… erosion threshold and relative erosion rate, microphytobenthos biomass and health, sediment particle size and size distribution, sediment water content, chlorophyll a and b concentration, and colloidal carbohydrate concentration. Mudflat sediment macrofaunal biomass was removed using …
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Terrestrial-aquatic transfers by hippopotamus (Hippopotamus amphibius): effects on food web and benthic community structure of the St Lucia Estuary, iSimangaliso Wetland Park, World Heritage Site, South Africa
… of meiofauna to high dung inputs relative to microphytobenthos and macrofauna. Comparisons of food web components from biotopes with contrasting hippo numbers (the Narrows: hippos dense; Charter’s Creek: hippos rare) indicated distinct consumer isotopic and fatty acid profiles, suggesting …
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The effects of terrestrial sediment inputs on ecosystem functions in seagrass meadows and unvegetated sediments
… seagrass meadows (Zostera muelleri) and microphytobenthos-dominated unvegetated habitats. To investigate the effects of reduced seafloor light availability and prolonged submergence periods resulting from global heating induced sea-level rise, I conducted a two-year seasonal in situ …
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Modeling the formation of periodic hypoxia in partially mixed estuaries and its response to oligotrophication and climate change
… balanced by exports. Watershed sources and microphytobenthos contributed comparatively little carbon to the whole system. Model simulations indicated that lower portions of the YRE tributaries are strongly influenced by watershed OM loading during summer, while the low mesohaline region is …
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Response and resilience of estuarine benthic ecosystems to anthropogenic pressures
… benthic PP was measured in adjacent seagrass and microphytobenthos-dominated (sandflat) soft-sediment habitats at three locations along a turbidity gradient. Benthic chambers were used to measure the flux of CO₂ across emerged sediments, and dissolved O₂ across submerged sediments to derive net …
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The resilience of biofilm on an intertidal mudflat
The key objective of this thesis was to determine the resilience of biofilm on an intertidal mudflat following a physical disturbance. Over the last decade the presence and importance of biofilm on intertidal mudflats has been a focus of scientific research as biofilm has been shown to play key …
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Evaluation of New Zealand estuarine water properties using remote sensing
… or density of seagrass/sandflats (where microphytobenthos (MPB) thrive) and use this as a basis to estimate their gross primary productivity (GPP). The new methodology combined Sentinel-2 imagery, machine learning and literature-derived photosynthesis-irradiance (P – I) curves. The …
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Changes in benthic ecosystem properties and functions across sedimentary gradients in estuaries
… light availability for primary production by microphytobenthos (MPB) that fuel benthic communities. Long-term alteration of grain size properties changes the distribution of key macrofaunal species and how they interact with their environment, carrying potentially serious implications for the …
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The Effects of Benthic Organisms on Intertidal Sediment Erodibility
On intertidal sandflats, the dispersal of juvenile organisms can rely on bedload transport, a critical process during small-scale disturbance recovery. The erosion of surface sediments is also vital to benthic-pelagic coupling, where resuspended microbes and organic material become available to …
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Examining UAV-based LiDAR, Multispectral, Hyperspectral and Precision Photogrammetry Approaches for Tidal Salt Marsh Environments
… S. maritimus from mudflat areas colonized by microphytobenthos. The resulting species distribution map achieved up to 96% accuracy, with medium marsh species (i.e., Sarcocornia spp.) populating the elevation range of 2.30–2.80 meters LAT, a transitional zone spreading within the range of …