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 1583 for “"freshwater"”.
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Enhancing the conservation of freshwater biodiversity through improved freshwater conservation planning techniques
Freshwater ecosystems and biota are among the most endangered in the world. This current situation is even more disturbing when future threats of escalating human demand and global climate change are considered. Urgent measures are therefore needed to conserve freshwater ecosystems and sustain the …
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Freshwater Mussels as Biofilters
Freshwater mussels (Bivalvia: Unionidae) are filter feeders, removing phytoplankton and other suspended particulate matter from the water. The removal of suspended matter from water is often considered desirable, in order to reduce algal blooms and in the treatment of drinking water. This thesis …
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Nitrogen Excretion in Freshwater Clams
No abstract prepared.
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Governance of Offshore Freshwater Resources
Land-based supplies of freshwater are being increasingly exploited and polluted at the same time that climate change and burgeoning human population are causing widening scarcity and rising demand. Scientists have discovered that vast quantities of fresh to slightly brackish water reserves are …
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Freshwater requirements of Knysna Estuary
… as well as the ethical problem of reducing the freshwater inflow into an estuary are explored.
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Freshwater bacterial diversity, functions and stability.
… The relationship between biodiversity and freshwater purification remains unclear. Freshwater purification is of paramount importance for humankind as eighty percent of the worlds population is exposed to high levels of threat in terms of water security. Bacteria are the most diverse and …
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Flatworm Predation on Juvenile Freshwater Mussels
… predominantly benthic species, feeds on juvenile freshwater mussels in fish hatcheries and mussel culture facilities. Laboratory experiments were performed to assess the predation rate of M. tuba on newly transformed juveniles of plain pocketbook mussel, Lampsilis cardium. Predation rate at 20°C …
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Elemental Stoichiometry of Freshwater Hyporheic Microorganisms
… that while the elemental stoichiometry of freshwater benthic bacteria is mostly homeostatic (doesn’t change significantly when nutrient feed ratios change), the range can vary and is dependent on the taxa. We were able to show homeostasis with respect to C:N ratios (3.7:1 – 8.1:1) and these …
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Elemental Stoichiometry of Freshwater Hyporheic Microorganisms
… that while the elemental stoichiometry of freshwater benthic bacteria is mostly homeostatic (doesn’t change significantly when nutrient feed ratios change), the range can vary and is dependent on the taxa. We were able to show homeostasis with respect to C:N ratios (3.7:1 – 8.1:1) and these …
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Assessment of a freshwater turtle reintroduction
The history of conservation translocations goes back over a century, but reintroduction biology is a young discipline. Reintroductions often elicit criticism for attempting to restore populations without directly addressing sources of declines. However, global population declines have made …
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Dynamics of freshwater plumes : observations and numerical modeling of the wind-forced response and alongshore freshwater transport
A freshwater plume often forms when a river or an estuary discharges water onto the continental shelf. Freshwater plumes are ubiquitous features of the coastal ocean and usually leave a striking signature in the coastal hydrography. The present study combines both hydrographic data and idealized …
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Dynamics of freshwater plumes: observations and numerical modeling of the wind-forced response and alongshore freshwater transport
A freshwater plume often forms when a river or an estuary discharges water onto the continental shelf. Freshwater plumes are ubiquitous features of the coastal ocean and usually leave a striking signature in the coastal hydrography. The present study combines both hydrographic data and idealized …
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THE CARBON DYNAMICS OF CONTRASTING FRESHWATER PONDS
… worldwide, and may represent most global liquid freshwater surface-area. They are easily constructed, holding promise for carbon-sequestration. However, pond carbon-cycling responded to storminess and temperature-extremes, making them vulnerable to projected anthropogenic climate-forcing.
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Byssus Production in Freshwater Mussels (Bivalvia: Unionoidea)
Freshwater mussels (Order Unionoida) are a widespread and ecologically significant group of bivalve mollusks that are particularly diverse in North American rivers. Mussels are patchily distributed, but can be very abundant in suitable habitat and dense multispecies aggregations known as "mussel …
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Hydrodynamics and freshwater diversion within Barataria Basin
… and evaporation over the model domain, and freshwater runoff as point sources. This study is focused on examining the impact of freshwater dispersion from the freshwater sources. Thus, a hydrologic model was developed to estimate runoff. Furthermore grid size was reduced, a new advective …
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Bird Use of Cumberland Island's Freshwater Wetlands
… barrier island off the coast of Georgia. Its freshwater wetlands are an important, rare habitat to have on a barrier island surrounded by saltmarsh and ocean. Many species of birds require freshwater wetlands as feeding, roosting and nesting grounds. However, the freshwater wetlands on …
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The Role of Images in Freshwater Conservation in South Africa: An Analysis of Images and Perceptions of Freshwater Fish
Freshwater biodiversity is highly threatened, but under-represented in media, and less well known than marine and terrestrial counterparts. The current lack of public awareness of freshwater species and ecosystems may limit freshwater conservation as a popular cause. The manner in which species are …
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Anti-aging potential of some freshwater microalgae extracts
… aimed to assess the anti- aging potential of freshwater microalgal extracts. Freshwater samples collected from the University of Zululand environment were enriched with BG-11 and cultured under UV illumination. Out of the ten (10) pure colonies isolated from the culture and characterised …
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Crayfish Predation on Juvenile Freshwater Mussels (Bivalvia: Unionidae)
North American native freshwater mussels are among the most endangered faunal groups in the world. Juvenile mussels are very small and potentially vulnerable to a wide variety of predators, including crayfish. This study examines predation by a native crayfish, Orconectes neglectus on juvenile …
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