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 73 for “"bioturbation"”.
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Taphonomy of Sediments: Bioturbation in the Triassic Moenkopi Formation in Southwestern Utah
<p>Measurement of bioturbation reflects physical and biological processes operating over time and can be used to reveal information about paleo-environments. The purpose of this study was to determine the intensity of bioturbation in Triassic Moenkopi Formation at Hurricane Mesa in Southwestern …
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Bioturbation in Supratidal Carbonates: Georadar Characterization of the Patterns and Structure of Decapod Burrows
Bioturbation in supratidal carbonate substrates has only recently received attention from ichnologists, relying primarily on traditional ground-based techniques. This study is the first high-resolution geophysical investigation of three decapod species inhabiting adjacent coastal biotopes on San …
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Gradients in benthic community structure and bioturbation potential along the Nordic Seas continental margin
… community structure,<br/>functional ecology and bioturbation potential. Species known to adopt the feeding strategy of the sub-surface storage of organic matter occurred in areas characterised by a seasonal input of organic matter. Species richness and diversity was highest at the Svalbard …
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The interactive effect of sandprawn (Callichirus kraussi) stebbing bioturbation and nutrients on macrofaunal communities
… experiments to investigate how nutrients and bioturbation by C. kraussi interact to structure macrofaunal communities and how ambient temperatures influence these factors.
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The influence of a petrochemical discharge on the bioturbation and erosion potential of an intertidal estuarine mudflat (Humber estuary, UK)
… of faecal pellets and biological secretions (bioturbation) have important implications for sediment structure, chemistry, transport characteristics and the flux of nutrients and contaminants. Although spatial and temporal patterns in bioturbation have been studied to some extent, little …
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The ecological effects of bioturbation on the eelgras Zostera capensis : community interactions and the impacts on the biota of an intertidal sandflat
… into the sediments. The ecological effects of bioturbation by Callianassa kraussi on the eelgrass Zostera capensis, and its indirect effects on the sedentary mudprawn Upogebia africana and the biota of an intertidal sandflat were assessed at Langebaan Lagoon, South Africa, through comparative …
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SEASONAL BIOCHEMISTRY IN THE SEDIMENTS OF THE GREAT BAY ESTUARINE COMPLEX, NEW HAMPSHIRE
… among bacterial activity, geochemistry and bioturbation. The upper 8-10 cm of sediments near the Jackson Estuarine Laboratory (JEL) were bioturbated actively from June to December. Sediments at the mouth of the Lamprey and Squamscott rivers (SQUAM) were not bioturbated …
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The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf
… biogenic structures are present and at what rate bioturbation occurs in sediments, the quantification of mixing rates and various physical parameters of biogenic structures reveals potentially important information about the effects of hypoxia on the macrobenthic community. Results show that …
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Stratigraphy, Sedimentology, and Ichnology of the Middle Cambrian to Lower Ordovician Deposits in Subsurface Western Canada
… fan-delta deposits display sparse to moderate bioturbation in mid- to outer-delta subaqueous deposits, indicating that endobenthic colonization was possible, even during short colonization windows, when stresses were ameliorated. BSU braided fluvial deposits lack bioturbation, indicating …
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Use of MicroCT to determine the functional ecology of intertidal infauna
Intertidal infauna through the process of bioturbation, play a major role in estuarine ecosystem functioning. Despite this, methods to both quantitatively and qualitatively assess the features produced from bioturbation have been limited. This study builds upon the recently developed technique by …
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NETWORK THEORY IN ICHNOLOGY: FROM BEHAVIOURAL TOPOLOGY TO THE DEPOSITIONAL ENVIRONMENT
… great potential for understanding Phanerozoic bioturbation patterns.
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Developing Recognition Criteria for Current-Wave-Enhanced Sediment Gravity Flows
… record, and how post-depositional changes (e.g., bioturbation, compaction, and diagenesis) alter these fabrics by examining the Ordovician Power Steps Formation, Bell Island, Newfoundland. The results of these investigations show that (1) CWESGFs are effective mechanisms for the offshore transport …
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DEPOSITIONAL SYSTEMS INTERPRETATION OF EARLY PERMIAN MIXED SILICICLASTICS AND CARBONATES, MIDLAND BASIN, TEXAS
… texture, sedimentary structure, and degree of bioturbation. Their main features are summarized from bottom to top of the cored interval. The Wolfcamp B2 and B1 intervals consist of multiple facies types, but are dominated by organic rich silty mudstone, skeletal argillaceous packstone, and …
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Benthic and pelagic responses to endobenthic bioturbator (Kraussillichirus kraussi) density, temperature and eutrophication in a global change mesocosm experiment
… than eutrophication in determining sandprawn bioturbation rates. Sediment boundary roughness (a proxy for bioturbation) increased by 43% at maximum sandprawn density under high temperatures (29.5℃), suggesting robustness of sandprawn physiology to future warming scenarios, particularly within …
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Biogene Steuerung ökologischer Systemeigenschaften des hyporheischen Interstitials der Lahn (Hessen)
… für biogene Dekolmationsvorgänge (Fraß und Bioturbation) untersucht.
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Aminosäure-D/L-Verhältnisse in biogenen Carbonaten als Schlüssel zur Datierung holozäner Sedimentationsvorgänge im norddeutschen Küstenraum
… ständig erodiert und umgelagert werden, was auf Bioturbation, Wellenschlag und gezeitenabhängige Meeresströmungen zurückzuführen ist. Unter extremen Bedingungen, z.B. beeinflusst durch Stürme oder Eisgang, können Schichten bis zu einer Mächtigkeit von mehreren Dezimetern betroffen sein. Diese …
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Factors influencing porosity and permeability, Wilcox Group (Eocene), Karnes County, Texas
… following sequence of partly overlapping events: bioturbation penecontemporaneous with deposition; compactional rotation of framework grains; compactional deformation of ductile grains; and precipitation of authigenic quartz, kaolinite, calcite, ferroan calcite and dolomite cement. A few samples …
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Interactions between ecosystem engineering by burrowing sandprawns (Callichirus kraussi) and nutrients: consequences for benthic community structure and ecosystem functioning
… the temperate west coast borders with Namibia. Bioturbation — the principal mechanism by which C. kraussi engineers influence associated biota in sedimentary systems, also has significant effects on sediment properties, biofilms, microalgal and microbial composition. However, theory suggests …
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Influence of Resource Pulses Following Stochastic Disturbances on Aquatic Food Webs
… in part to nutrient subsidies provided through bioturbation and excretion. Shallow lakes dominated by common carp are often subject to winter hypoxia, periodically resulting in stochastic mass mortality events. These natural disturbances may result in an important resource pulse through carcass …
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Impacts of Spawning Sockeye Salmon (ONCORHYNCHUS NERKA) on Benthic Macroinvertebrate Production in the White River, WA
… through marine-derived nutrient subsidies and bioturbation. Further, the low densities and biomass of multivoltine taxa in the lower White River indicates that despite its substantial run of returning sockeye salmon, the river may still have a limited food base for rearing salmonids. However, …
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