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.
Results
Showing 1 to 20 of 97 for “"primary producers"”.
-
Effects of artificial light at night on benthic primary producers in freshwaters
… of energy and an important environmental cue for primary producers that influences and to a large extent drives their growth, production and community structure. Freshwaters are increasingly illuminated at night, as they are often located near the human population centers. Despite this, the …
-
Water Quality and the Primary Producers in the Upper James River, Missouri
Monthly water quality, periphyton biomass, and species composition were determined at three stations in the upper James River, Missouri, was determined from May to November 1980. Periphyton cell numbers (cells x 10⁵ cm⁻²) gradually increased during the study, and ranged from 3.43 to 32.9 x 10⁵ …
-
Empirical Analyses of Price Relationships in the Live Beef Cattle Futures Market--Implications for Primary Producers
Made available in DSpace on 2014-12-13T19:23:20Z (GMT). No. of bitstreams: 1 7714945.pdf: 6252941 bytes, checksum: 17f7286a1e9f98e42b577111336dfaea (MD5) Previous issue date: 1977
-
The production of oilseeds in Ethiopia: value chain analysis and the benefit that accrue to the primary producers
… to the domestic market. Although farmers are the primary producers of oilseeds, they are not able to benefit from the growing market share of the product due to the fact that they find themselves at the end of an extended market chain. As a result they only receive a very small proportion of what …
-
Investigation of the Interactions Between Sea Ice Algae from the Marginal Ice Zone of Antarctica and Artificial Sea Ice
… the Earth's climate system. Sea ice algae act as primary producers of organic carbon, forming the building blocks
-
Studies on the autecology of Myriophyllum aquaticum in the South-Western Cape Province
… any freshwater ecosystem. In addition to being primary producers, they assist in nutrient circulation and provide shelter and spawning areas for many other forms of associated animal life (Nichols and Keeney, 1973; De Marte and Hartman, 1974).
-
The Influence of Changing Nutrients and Warming on Phytoplankton and its Interactions with Zooplankton in the North Sea
… winter dissolved inorganic nitrogen as the primary driver of reduced spring Chl-a; winter P and N:P are not significant predictors, and spring SST has a weak positive effect. Information-theoretic network analysis indicates that plankton interactions at Helgoland Roads are highly sensitive …
-
Unifying ecosystem concepts and mercury biomagnification in an estuarine environment using stable isotopes (delta-carbon-13 and delta nitrogen-15).
… terrestrial carbon, in situ estuarine primary production, and marine phytoplankton. Isotopically depleted delta13C and delta15N values verified terrestrial carbon was a major source of energy to estuarine sediments and SPM. A cluster analysis of mean delta13C and delta 15N values for 47 …
-
Linking foraging behaviour of post-breeding adult female elephant seals from Marion Island to physical dynamics and productivity at the South-West Indian Ridge
… in turn affected by the underlying richness of primary producers.
-
Are PCBS in phytoplankton and zooplankton at equilibrium with the water in which they live?
… biphenyl (PCB) concentrations within primary producers such as phytoplankton simply reflect chemical equilibrium of PCB congeners freely dissolved in the water column and in the lipid fraction of the plankton. In this study, the freely dissolved PCBs in the water of Lake Cochituate, …
-
Impacts of legacy mining on stream structural and functional processes in an urban stream
… and species diversity and abundance of primary producers (i.e., periphyton and macrophytes), biofilm diatoms, macroinvertebrates and the sediment microbial community in addition to investigating the stream from a functional approach, focusing on surface water and sediment nutrient …
-
Assessing interactions between nutrients and aquatic toxicity : influences of nitrogen and phosphorus on ionic silver toxicity to the aquatic macrophyte Lemna gibba.
… to be more acutely toxic to aquatic life. The primary objective of this study was to understand the effects of nitrogen (N) and phosphorus (P) concentrations and N : P ratios on the toxicity of ionic silver toxicity to the model aquatic macrophyte Lemna gibba over 7-d study periods. The …
-
Algal Biodiversity Survey of the Middle Chattahoochee River Using DNA Metabarcoding
… role in water systems as bioindicators and primary producers. They can be challenging to identify with the naked eye, so researchers have been using DNA metabarcoding, where DNA belonging to specific taxa can be isolated and identified from water samples. The objective of this study was to …
-
Ecological Process in Pattern Generation in Tropical Coral-Seagrass Reefscapes
… at multiple spatial scales, from benthic primary producers to macrograzers and the predators that prey on them. Explanations for the phenomenon can be physical, biological, or some combination of both, and the underlying drivers may be impacted by threats like overfishing and global …
-
CE-LIF ANALYSIS OF INTACT MARINE MICROBES ALONG WITH THEIR CONSTITUENT PHYCOBILIPROTEINS AND PHYCOBILIN PIGMENTS
… significantly to the marine biosphere as primary producers and as participants in global carbon and nitrogen cycles, and so it is vital to develop efficient methods for cyanobacteria quantitation and characterization. Capillary electrophoresis (CE) methods with dual-wavelength laser …
-
Multi-trophic Biodiversity Increases with Increasing Structural Complexity of Forest Canopy
… complexity of forest canopy on multi-trophic (primary producers, herbivores (beetles), omnivores (birds)) diversity in forested ecosystems. We used plant presence, beetle pitfall trap, and bird count data to calculate species richness and species diversity, and high density LiDAR data for …
-
Biophysical interactions in the Iceland Basin
… the world oceans. Furthermore, the link between primary productivity and herbivory by the calanoid copepod, Calanus finmarchicus provides the trophic link between primary producers and the important commercial fishery for Atlantic Cod. However, one result of ocean warming is that the distribution …
-
Ecology, diversity and comparative genomics of oceanic cyanobacterial viruses
… and Synechococcus are numerically dominant primary producers in the oceans. Each genera consists of multiple physiologically and genetically distinct groups (termed "ecotypes" in Prochlorococcus). Cyanobacterial viruses (cyanophages) that infect Synechococcus are abundant (to 104-106 phage …
Page 1 of 5