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 18 of 18 for “"deep chlorophyll maximum"”.
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The photophysiology and primary productivity of phytoplankton within the deep chlorophyll maximum
In temperate shelf seas, a deep chlorophyll maximum (DCM) persists within the thermocline during summer stratification. This study explores the significance of primary production (PP) within the DCM and provides a detailed investigation into the mechanisms of phytoplankton adaptation to this …
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Investigations into the seasonal deep chlorophyll maximum in the western North Atlantic, and its possible significande to regional food chain relationships
In many marine environments accumulations of chlorophyll have been reported to occur at or below depths to which 1% of ambient light penetrates. The phenomenon has been called the Deep Chlorophyll Maximum (DCM). On occasion zooplankton have been observed to be suggestively associated with a DCM. In …
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Distribution of thiols in the northwest Atlantic Ocean
… concentration of both thiols was found at the deep chlorophyll maximum in most samples. Thiol concentrations were higher on the continental shelf than in the open ocean. The observed distribution of cysteine and glutathione and thermodynamic stability of copper complexes suggests that …
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Distribution of thiols in the northwest Atlantic Ocean
… concentration of both thiols was found at the deep chlorophyll maximum in most samples. Thiol concentrations were higher on the continental shelf than in the open ocean. The observed distribution of cysteine and glutathione and thermodynamic stability of copper complexes suggests that …
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HYDROGRAPHIC OBSERVATIONS OF OXYGEN AND RELATED PHYSICAL VARIABLES IN THE NORTH SEA AND WESTERN ROSSSEA POLYNYA investigations using seagliders, historical observations and numerical modelling
… matter production from the spring bloom and a deep chlorophyll maximum. The constant consumption of oxygen for the remineralisation of the matter exported below the thermocline exceeded the supply from horizontal advection or vertical diffusion. The Seaglider identified cross-pycnocline mixing …
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Dimensions of microbial biodiversity in the North Pacific subtropical Gyre
… the nature of the transitions from shallow to deep surface water communities is not well understood. Using a high resolution depth series across twelve time points, we observed that microbial communities partitioned into four groups that consisted of all samples above the deep chlorophyll …
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Chemical controls on the cycling and reactivity of marine dissolved organic matter
… Subtropical Gyre (NPSG) showed a sharp activity maximum near the deep-chlorophyll maximum (DCM). High-resolution nutrient measurements suggest that this subsurface CLA maximum is the result of a high nitrate flux at the top of the nitracline. The composition of particulate-P through the euphotic …
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Chemical Controls on the Cycling and Reactivity of Marine Dissolved Organic Matter
… Subtropical Gyre (NPSG) showed a sharp activity maximum near the deep-chlorophyll maximum (DCM). High-resolution nutrient measurements suggest that this subsurface CLA maximum is the result of a high nitrate flux at the top of the nitracline. The composition of particulate-P through the euphotic …
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Community composition, migration and trophic positions of micronekton in two biogeochemical provinces of the South West Indian Ocean
… that enrich surface layers in nutrients and chlorophyll - a, therefore contributing to a higher abundance and micronekton species richness. In the ISSG, the large - scale wind - driven anticyclonic gyre pushes the nitracline, thermocline and deep chlorophyll maximum deeper in the water column …
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The marine biogeochemistry of dissolved and colloidal Iron
… However, cFe was depleted or absent at the deep chlorophyll maximum. A summary model of dFe size partitioning in the North Atlantic open ocean is presented in conclusion, hypothesizing that a constant dFe exchange between soluble and colloidal pools modulates the constant partitioning of …
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The marine biogeochemistry of dissolved and colloidal iron
… However, cFe was depleted or absent at the deep chlorophyll maximum. A summary model of dFe size partitioning in the North Atlantic open ocean is presented in conclusion, hypothesizing that a constant dFe exchange between soluble and colloidal pools modulates the constant partitioning of …
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Investigation of primary productivity along the Atlantic Meridional Transect (50°N to 33°S) through fast repetition rate fluorometry
… each station and further analyses of nitrate and chlorophyll were carried out for confirmation of the provinces. The structure of phytoplankton community and its distribution were assessed by statistical analyses of the phytoplankton pigments detected by high performance liquid chromatography. The …
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Predicting phytoplankton community dynamics: understanding water quality responses to global change
A fundamental focus in ecology is understanding interactions between environmental heterogeneity and ecological community structure, both of which are currently undergoing unprecedented alterations due to global change. In particular, many freshwater phytoplankton communities are experiencing …
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Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels
… ratios in marine particulate and sedimentary chlorophyll derivatives; (2) to establish chlorophyll δ15N and δl3C as proxies for the nitrogen and carbon isotopic composition of marine phytoplankton; and (3) to use chlorophyll nitrogen isotopic ratios to understand the origin of Late Quaternary …
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High-resolution geochemical studies on the most recently-accumulated sapropel S1 in the eastern Mediterranean
… episode of improved reventilation and increased deep-water O2 concentrations. A number of redox-sensitive elements are enriched (Cr, Mo, Ni, S, Se, U, V and Zn) in LC21 and MD 90-917, and exhibit double peaks in their concentration depth profiles. The principal routes by which SI develops high …
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Seasonal and spatial patterns in nitrogen cycling and food web interactions in Lake Taupō New Zealand
… Taupō. Lake Taupō is a large (616 km² in area), deep (92 m mean depth), warm monomictic lake in the North Island of New Zealand. It shares many of the characteristics typical of large, deep oligotrophic lakes globally and can be viewed as a model system to examine nutrient cycling-food web …
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Estudio de las interacciones microbianas de comunidades planctónicas en gradientes ambientales
Las comunidades microbianas juegan un papel crucial en los ciclos biogeoquímicos en la naturaleza. El fitoplancton y el bacterioplancton están en la base de la red alimentaria microbiana en los sistemas acuáticos, siendo el principal productor y descomponedor de carbono orgánico, respectivamente. …