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 29 for “"Bacterioplankton"”.
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Bacterioplankton dynamics in the Southern Benguela upwelling region
The role of heterotrophic bacteria in the carbon and nitrogen flux of the pelagic food web was investigated during laboratory and field-based studies of the temporal development of the planktonic community after upwelling. Bacterial community structure, activity and production were closely coupled …
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Bacterioplankton community composition and activity in the Atlantic Ocean
Temporal and spatial patterns of bacterioplankton in six different provinces of the Atlantic<br/>Ocean were examined between 1996 and 2004. The abundance and integrated biomass<br/>of three prokaryote groups (Prochlorococcus spp., Synechococcus spp. and heterotrophic<br/>bacteria) were used to …
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Bacterioplankton in the Chesapeake Bay: Genetic diversity, population dynamics and community proteomics
… population dynamics and metabolic activity of bacterioplankton living in the Bay. In this study, clone libraries containing the rRNA operon (16S rRNA-ITS-23S rRNA) were constructed from samples collected from the Chesapeake Bay to study spatial and temporal dynamics of estuarine …
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Assessing Respiration Rates and Nutrient Dynamics of Aritifical Reef Biofilms and Bacterioplankton in the Mississippi Sound
<p>Artificial reefs are primarily used to provide a suitable habitat for target fish populations, but the structures can also improve water quality and benefit non-target organisms. Laboratory incubation experiments were conducted in the presence of biofilm on rubble and in its absence to examine …
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Factors influencing the abundance, community composition and activity states of bacterioplankton from the tidal freshwater James River
Aquatic bacteria respond to changing environmental conditions through a variety of mechanisms including changes in abundance, shifts in community composition and variable activity states. In the tidal-freshwater James River, variation in bacterial abundance was linked to nutrient availability and …
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Explaining the Variability of Free-Living and Attached Bacterioplankton Abundances in the Bay of St. Louis, Mississippi
… in BSL water quality, freeliving and attached bacterioplankton concentrations were enumerated by epifluorescence microscopy. Nine stations were sampled during outgoing tidal cycles from March to September 2007 to determine how the water quality changed as it is flushed out of BSL. Environmental …
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Using Hplc and Pcr-Dgge for the Assessment of Phytoplankton and Bacterioplankton Communities in Scottish Freshwater Lakes
… were determined using microscopy and HPLC, while bacterioplankton density and diversity were assessed using flow cytometry (FC), epifluorescence microscopy (EPM), and PCR-DGGE respectively. HPLC and PCR-DGGE were initially applied to water samples from Loch Rannoch to test the applicability of the …
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Bacterioplankton dynamics in surface waters of the north-eastern (sub-)tropical Atlantic Ocean affected by Aeolian dust
… the region’s surface water bacterioplankton community was compared with adjacent<br/>regions in terms of metabolic activity, by measuring the uptake rates of radioactively labelled<br/>amino acids (3H-leucine and 35S-methionine) as a proxy for bacterial production. …
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Coupling Metaproteomics with Taxonomy to Determine Responses of Bacterioplankton to Organic Perturbations in the Western Arctic Ocean
<p>Understanding how the functionality of marine microbial communities change over time and space, and which taxonomic groups dominate distinct metabolic pathways, are essential to understanding the ecology of these microbiomes and the factors contributing to their regulation of elemental cycles in …
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Bacterioplankton Production in the Western Mississippi Sound and the Role of Photosynthetic Extracellular Release as a Driver of Bacterial Production
<p>Bacterioplankton growth and metabolic activities are a vital component in structuring marine and estuarine ecosystems. In this study, bacterial production (BP) was investigated at two separate stations in the western Mississippi Sound (MS). One was an inshore site outside of the Bay of St. Louis …
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Effect of organic nutrient perturbation on microbial community dynamics and composition in Scottish coastal waters
… by nutrient-stressed phytoplankton on the bacterioplankton dynamics or the factors limiting the natural microbial communities. These experiments highlighted the key role of bacteria within the microbial loop, efficiently regenerating DOM into inorganic nutrients, the importance of the …
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Microbial production and consumption of marine dissolved organic matter
… also employed in growth assays with oligotrophic bacterioplankton strains to examine effects on heterotrophic growth dynamics. Reproducible responses ranged from suppressed to enhanced growth rates and cell yields, and depended both on the identity of the heterotroph and the source of the DOM. …
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Microbial production and consumption of marine dissolved organic matter
… also employed in growth assays with oligotrophic bacterioplankton strains to examine effects on heterotrophic growth dynamics. Reproducible responses ranged from suppressed to enhanced growth rates and cell yields, and depended both on the identity of the heterotroph and the source of the DOM. …
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Application of machine learning methods to predict phytoplankton blooms and determine microbial biomarkers using marine microbiomes
Understanding the relationship between bacterioplankton and coastal phytoplankton blooms is key to understand coastal ecosystems functioning, which are the most productive areas for fisheries. With that knowledge, we could predict and may be mitigate, the effects of global change or contamination …
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The Effects of Phosphorus Enrichment on the Dominant Phytoplankton Communities of Chaney Lake
… by phosphorus. However, phosphorus may limit bacterioplankton, periphyton, or both. The high nutrient concentrations with low elemental ratios indicate that bacterioplankton may be more efficient in phosphorus utilization and possibly play an important role in nutrient availability for …
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Bacterial Assemblages And Microbial Enzyme Activity In The Major Tributaries Of The Lower Mississippi River
… environmental characteristics and distinct bacterioplankton communities, there were no consistent differences in enzyme activity between rivers, although aspects of community structure could be linked to extracellular enzyme activity. Overall, this research shows that large rivers of the …
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Characterization of the prokaryotic community associated with the giant barrel sponge, Xestospongia muta across the Caribbean
… sponge prokaryotic community and the surrounding bacterioplankton. Additionally, both symbiont and bacterioplankton populations were different between locations. In addition to the recovery of many sequences from bacterial phyla commonly found in sponges, a diverse archaeal community was also …
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Application of the ³H-Leucine incorporation technique for quantifying rates of bacterial secondary production associated with decaying wetland plant litter
… in popularity since its original description for bacterioplankton communities. Previous studies examining <sup>3</sup>H-leucine-incorporation conditions for bacterial communities in other habitats have reported a wide range of final leucine concentrations to achieve saturation-level uptake. This …
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Emergent patterns of diversity and dynamics in natural populations of planktonic Vibrio bacteria
… dynamics of microbial diversity within coastal bacterioplankton using the genus Vibrio as a model system. Vibrios are ubiquitous marine bacteria, and include a variety of pathogens. Quantification of Vibrio environmental dynamics by cultivation- independent quantitative PCR and constant …
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