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 26 for “"Benthic fauna"”.
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Experimental studies of interactions between Zostera marina and the associated benthic fauna
… and seasonal changes in abundance of the benthic infauna within an eelgrass bed; (2) Observe what immediate effects occur to the benthic community as a result of experimental removal of eelgrass plants from plants within the Zostera bed; (3) Measure the seasonal variation of eelgrass …
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Past and present benthic fauna of Lake Maratoto with special reference to the chironomidae
The benthic fauna of Lake Maratoto, a eutrophic dy (dystrophic) lake in the Waikato basin, was investigated from 19/9/78 to 13/3/80. Core samples were taken at approximately fortnightly intervals from six stations of varying depths. Fifty taxa were recognised and the distribution and seasonal …
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A Survey of Pollution on Selected Streams in the Black Hills of South Dakota
… effluents and mining wastes. A comparison of the benthic fauna community below a pollution source to that above it was the primary basis for evaluating the effect of the pollution source on the stream. The results of the benthic fauna samples indicated that the streams surveyed were being …
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Submerged wood inhabiting macoinvertebrates of the Elm Fork of the Trinity River, Texas: Assemblage analyses, comparisons to the benthic fauna, and a study of Cyrnellus fraternus (Trichoptera: Polycentropodidae)
… Larvae were not found in the soft sand and mud benthic habitats near submerged wood. The insects were multivoltine with a minimum of three generations per year. Pupae were collected July through September and adults emerged from May through October. The population overwintered as larvae. …
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The diet of selected benthic feeding fish in the Mfolozi-Msunduzi system, KwaZulu-Natal
… found it to be impoverished but large numbers of benthic feeding fish are present in the system at times. This raised the question: if the zoobenthic community is impoverished and high numbers of benthic feeding fish are nevertheless present in the system, then what are these fish feeding on? The …
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Spatial and temporal distribution of the benthos in the Mfolozi-Msunduzi Estuary, KwaZulu – Natal
… the subtidal component of the invertebrate benthic fauna and to investigate spatial and temporal distribution of the fauna. Samples were collected quarterly in 2009 to investigate seasonal patterns of the benthos of the system. Another aim of this study was to determine the benthic biomass …
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Soft sediment ecology of Lough Hyne Marine Reserve - spatial and temporal patterns
Distribution of soft sediment benthic fauna and the environmental factors affecting them were studied, to investigate changes across spatial and temporal scales. Investigations took place at Lough Hyne Marine Reserve using a range of methods. Data on the sedimentation rates of organic and inorganic …
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Some effects of abandoned manganese strip mines in Smyth County, Virginia on stream ecology
… was found to support fewer species of fish and benthic fauna than Crigger Creek, a comparable control stream. Siltation is probably the main contributing factor. Bedload was much greater in affected streams than in control streams. Although volume of bedload was high in Blue Spring Creek, which …
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Copper speciation in estuaries and coastal waters
… toxic effects on microorganisms, fish, and benthic fauna. I modified and improved a commonly used approach to determine metal speciation (competitive ligand exchange adsorptive cathodic stripping voltammetry, CLE-ACSV). Using this new approach to chemical Cu speciation and an old approach to …
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Palaeoecology and taxonomy of the macrobenthic fauna from the Upper Cretaceous Ajlun Group, southern Jordan
… So far, very little is known about the fauna and the depositional environment of the group, especially of the transitional marginal marine part. Also, in depth studies of the Cretaceous fauna of southern Jordan are very rare. Therefore, the benthic fauna of the area is described in an …
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Organic Enrichment of Scottish Salmon Fish Farm Sediments: A Quantitative Analysis of Sulphur Biogeochemistry
… of organic material. This is critical for the benthic faunal community as the end product, sulphide, is toxic. Benthic fauna contribute significantly to organic matter degradation in the sediments and to the maintenance of a “healthy” sediment environment through mixing and irrigation …
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Middle and Upper Jurassic bivalves from the Iberian Range (Spain)
… distribution pattern and ecology of the bivalve fauna occurring in Middle and Upper Jurassic rocks of the Aragonian Branch of the Iberian Range have been analysed. For this purpose 14 sections and 5 additional outcrops, selected according to the abundance of bivalves, were measured in detail and …
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Sediment Deposition in the Deep Sea: from Seamounts to the Hadal Trenches
The deep-sea fauna is dependent on the delivery of nutrients from the overlying waters. As data/observations show, benthic fauna is supported under both oligotrophic oceanic conditions and at the greatest (hadal) depths. This can be explained by an additional food source originating from sediment …
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Characterization of the prokaryotic community associated with the giant barrel sponge, Xestospongia muta across the Caribbean
… to be ecologically important members of the benthic fauna on coral reefs. Recently, it has been shown that sponges, and their symbiotic microbes, are also important contributors to the nitrogen biogeochemistry of coral reefs. Here, I investigate the ecology and physiology of the microbial …
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The Evolutionary History and Phylogeny of the Lithodinae (Decapoda: Anomura: Lithodidae)
… between deep and shallow oceans<br/>in mobile benthic fauna. Molecular sequences were obtained from six genes (for 47<br/>species belonging to 10 genera of Lithodidae) and different aspects of morphology were<br/>examined in order to identify nested monophyletic groups based on shared, …
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Biochemical Composition of Caribbean Gorgonian Corals and Their Symbiosis Under Ambeint and Stressful Conditions
Gorgonian corals are the dominant benthic fauna on Caribbean reefs. Unlike scleractinian corals, gorgonian abundance on these reefs has remained stable or has increased. Therefore, to predict how climate change will affect the reef community, it is essential to understand gorgonian physiology under …
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Estudos sobre a população de Portunus spinicarpus (Stimpson, 1871) (Crustacea: Decapoda: Brachiura) da região do Cabo Frio, Brasil
… food and temperature. The greatest abundance and benthic fauna diversity was observed at 45 m depth, whereas during Summer (and Spring, with intermitlent downwellings) this area remains watered by lhe cold upwelled waters from the ACAS (Central Waters of South Atlantic). It is discussed wheter …
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The effectiveness of Autonomous Underwater Vehicles (AUVs) for mapping and monitoring the seabed – a novel toolkit for marine management
… of the physical and biological components of the benthic environment. The usual method of obtaining this data is through seabed mapping and sampling. Mapping is relatively widespread, ranging from historically simple tools such as plumb-lining, through to modern and novel technology with remote …
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Drivers and effects of plastic contamination in aquatic ecosystems
… be source of MPs that can eventually contaminate benthic fauna. In Chapter 3, the exposure to MPs was evaluated using economically and ecologically key crustaceans Palinurus elephas (Fabricius, 1787) and Nephrops norvegicus (Linnaeus, 1758) collected from sites located on the western coast of …
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The macrobenthos of the Mlalazi estuary: KwaZulu-Natal
… for the purpose of a masters study, of the benthic community was initiated during the period 1989-1991 but unfortunately was never written up or published. Additional sampling in the Mlalazi estuary was carried out from August 1999 to July 2000 at the same six sites where the 1989-1991 …
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