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 23 for “"Northeast Atlantic"”.
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… Here, a new tool to study the eastern North Atlantic Ocean is created by combining a regional, eddy-resolving numerical model with observations to produce a state estimate of the ocean circulation. The estimate is a synthesis of a variety of in-situ observations from the Subduction …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… Here, a new tool to study the eastern North Atlantic Ocean is created by combining a regional, eddy-resolving numerical model with observations to produce a state estimate of the ocean circulation. The estimate is a synthesis of a variety of in-situ observations from the Subduction …
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The basking shark Cetorhinus maximus: movement, behaviour and connectivity in the Northeast Atlantic
… basking shark surface hotspots across the North Atlantic. Re-sightings and satellite tracks showed connectivity within given years between all known surface hotspots in the ROI and UK as well as confirming inter-annual connectivity between Irish, UK and US hotspots. The final chapter draws …
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The Impact of Fishing on Populations of Deep-water Chondrichthyan Fishes of the Northeast Atlantic
… and biological data are required in the northeast Atlantic to provide accurate management programs for deepwater chondrichthyans.
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New insights into the summer distribution of basking sharks (Cetorhinus maximus) in the northeast Atlantic
… widespread historic exploitation in the northeast Atlantic and are of conservation concern. A greater knowledge on their spatial and temporal habitat use in response to environmental conditions is required to better inform subsequent monitoring and management strategies. Several efforts …
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Population structure of Atlantic herring, Clupea harengus L., in the northeast Atlantic using phenotypic and molecular approaches
… Thus, the population genetic structure of Atlantic herring remains undefined. Three sets of phenotypic (meristics, morphometries, otolith shape) and molecular (allozymes, mitochondrial DNA RFLPs, micro satellites) markers were simultaneously used to investigate the morphological and genetic …
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Biology & ecology of a killer whale (Orcinus orca) community that interacts with pelagic trawlers in the Northeast Atlantic
… operating offshore during the autumn/winter Northeast Atlantic mackerel (Scomber scrombrus) fishery, have been documented in the literature since the 1970s. However, baseline information on the biology and ecology of these killer whales is lacking. To bridge the gap, this PhD thesis aims to …
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Physical and biological forcings on the carbonate chemistry in the North Atlantic Ocean
… investigated in several regions of the North Atlantic Ocean, allowing a better understanding of the natural processes affecting the carbonate system in this ocean basin. For this purpose, the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean was …
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How does plankton distribution and activity influence the variability of carbon dioxide uptake in the North Atlantic?
… of the carbon dioxide (CO2) sink in the North Atlantic at a range of spatial and temporal scales. Phytoplankton indices collected from the continuous plankton recorder (CPR) and the concentration of CO2 within the surface waters show that at seasonal time-scales phytoplankton play an important …
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Applications of time series analysis to geophysical data
… wave dispersion along the Walvis Ridge, South Atlantic Ocean, is obtained by bandpass filtering the recorded seismogram in the frequency domain. The group velocity is anomalously low in the period range of 15-50 s, and formal inversion of the data indicates both crustal thickening to 12.5 km …
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Molecular and morphological factors contributing to the resolution of the taxonomy of Octopus vulgaris Type III
… ss, which is found in the Mediterranean and Northeast Atlantic.
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Flutes, megaflutes and erosional bedforms: a reappraisal of their dynamics
… deep-water canyon/channel systems along the northeast Atlantic continental margin. Scours range from 40-3170 m wide and 8-48 m deep and occur in zones of rapid flow expansion, such as channel mouths or overbank areas.
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ROWERS' PERCEPTIONS OF EXERCISE ADHERENCE AND ROWING CULTURE: A MIXED-METHODS INVESTIGATION
… were club and university rowers in the Northeast Atlantic region, all of whom were at least 18 years of age and actively rowing at the time of study One hundred thirty-one athletes, 77 female and 54 male, participated in the quantitative phase of the study. The online survey included the …
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Satellite-derived fluorescence quantum yields as indicators of phytoplankton photophysiology
… modulated by latitude. Across the northwest and northeast Atlantic shelf sea regions, fluorescence yields are lower throughout the year than in the open ocean. Interannual variability is greatest during late autumn and winter months, aligned with times of dynamic water column mixing. An empirical …
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Using ecosystem services mapping in deep-sea Marine Spatial Planning
… basins with better performance shown in northeast Atlantic models than in the South Atlantic. By combining the socio-ecological information on the services provided by deep-sea habitats and maps generated by HSM, the final output produces maps of the distribution of deep-sea ecosystem …
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The Ecology of Cuvier’s beaked whale, Ziphius cavirostris (Cetacea: Ziphiidae), in the Bay of Biscay
… (sea surface temperature) in the Bay of Biscay, northeast Atlantic. This study used a differing combination of environmental variables and modelling: GAM (General Additive Model), and ENFA (Ecological Niche Factor Analysis), and PCA (Principal Component Analysis). Geographical Information Systems …
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Population genetics and evolutionary history of some deep-sea demersal fishes from the Azores - North Atlantic
… deep-sea demersal fish species from the North Atlantic. In the Azores archipelago, the demersal fishery is the second most important after tuna and Helicolenus dactylopterus, Beryx splendens and Beryx decadactylus are among the most captured species. Partial sequences for the mitochondrial …
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Implementation of a method to determine sub-nanomolar concentrations of iron in seawater and its application to the study of marine iron biogeochemistry at the ocean-shelf interface
… in this study, from the Celtic Sea shelf edge (Northeast Atlantic), and from the North Scotia Ridge (Southern Ocean).<br/>The distribution of iron at the Celtic Sea shelf edge was examined, and was used to provide a conceptual framework for future studies. Dissolved Fe (< 0.4 µm) concentrations …
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The Environmental Sensitivity of Cold-water Corals Lophelia pertusa
… depth coinciding with the presence of year round Atlantic water. Original recruits were likely from the northeast Atlantic and are now annually self-recruiting to the platforms. Additional video from Tern in 1993, 1994, 1998, and 2002 provided the first in situ colony growth rate (26 ± 5 mm yr-1) …
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UNDERSTANDING OF THE VARIABILITY OF PHYTOPLANKTON ECOSYSTEM FUNCTION PROPERTIES: A SYNERGISTIC USE OF REMOTE SENSING AND IN SITU DATA
… production of a >50 years Chl-a dataset in the Northeast Atlantic and North Sea. It was found that the documented mid-80s regime shift corresponded to a 60% increase in Chl-a since 1948; a result of an 80% increase in Chl-a during winter alongside a smaller summer increase. GAMs indicated that …
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