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 14 of 14 for “"N:P ratio"”.
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Prediction of Foliar Biochemistry in a Boreal Forest Canopy Using Imaging Spectroscopy and LiDAR Data
… ranging (LiDAR) are used to model the foliar N:P ratio, macronutrients (N, P, K, Ca, Mg) and chlorophyll. Measurement of both foliar macronutrients and foliar chlorophyll provide critical information about plant physiological and nutritional status, stress, as well as ecosystem processes such as …
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Recruitment from resting stages among bloom-forming cyanobacteria
… my studies. Cyanobacteria has a low internal N:P ratio and in eutrophic freshwaters, cyanobacterial dominance is often correlated with low N:P ratios. Accordingly, I found that recruitment rates of cyanobacterial resting stages were increased at declining N:P ratios. A plausible explanation to my …
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The effect of resource stoichiometry on fish and macroinvertebrate nutrient excretion
… related to P content and the N:P excretion ratio was negatively related to the body N:P ratio. However, this relationship was driven primarily by two phosphorus rich species, mottled sculpin in the fish and crayfish in the macroinvertebrates. Some relationships did emerge between consumer …
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Absolute values only show part of the whole : evidence of P limitation in legumes in the CFR from N:P ratios
… significantly higher Zn, Fe, P, C and N concentrations, and lower C:N and C:P ratios. Legumes appeared to have a more efficient nutrient uptake strategy. However, the higher N:P ratio of legumes suggests that despite higher absolute nutrient concentrations, legumes were P limited. This study …
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Phycoremediation of NH4+ and PO43- from meat processing wastewater by using microalgae botryococcus sp.
… in a water body will lead to high concentration of undesirable microorganisms such as phytoplankton. This will lead to more serious problems that affects the ecosystem and brings human health problems. In over many years ago, considerable researches have been carried out on use of …
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The Role of Nitrogen and Phosphorus in the Growth, Toxicity, and Distribution of the Toxic Cyanobacteria, Microcystis aeruginosa
… dominating aquatic ecosystems in low N:P atomic ratios less than 44:1, the reliability of N:P ratios as a tool for managing and predicting <em>M. aeruginosa </em>blooms is explored through analyzing the specific roles of N and P in influencing its growth, toxicity, and distribution. N is far more …
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The Effects of Food Quality and Temperature on Mesozooplankton Physiology
… food quality in terms of phytoplankton organic ratios N:P, C:N and C:P and fatty acid content, on Temora longicornis feeding, respiration, and egg production rates (EPR). Maximum metabolic rates, assimilation efficiency and gross growth efficiency coincided with an optimum diet of ~16N:1P …
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Computational analysis of eukaryotic metatranscriptomes from diverse marine environments
… on biogeochemical cycles (E.g. the Red�eld ratio of Nitrate (N) to Phosphate (P)). This was modelled by our collaborators from the University of Exeter, who produced a global phytoplankton cell model of resource allocation. They showed how the N:P ratio di�ers across latitudinal temperature …
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The Development and Characterisation of a Peptide Delivery Platform to Interrogate the Anticancer Effects of Bisphosphonates
… comparable to the RALA peptide at N:P ratio 6 with comparable alpha-helicity. RALA26 therefore holds promise as a functional truncated RALA-derived peptide and warrants further investigation. <br/><br/>The anticancer effects of ALN were investigated through a series of in vitro studies …
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The mechanisms behind alternative community states: Understanding producer composition in temporary and semipermanent wetlands
… roles of nitrogen (N), phosphorus (P), and N:P ratio in driving floating plant dominance in a separate survey dataset and in a field experiment. In the observational work, N, P, and N:P ratios all were associated with producer community composition. I manipulated the three variables in …
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Responses of zooplankton to variation in elemental composition of algae: Regulation at individual and ecosystem levels
… ability to initiate behavioural (i.e. filtration rate) and/or physiological (i.e. excretion rate of digestive enzymes) responses designed to cope with dietary phosphorus (P) deficiency. This first stoichiometrically explicit model of Daphnia filtration and digestion shows that an increase …
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Investigating groundwater derived nutrient fluxes within Tauranga harbour, New Zealand
… cycles. Due to the large coastline to land area ratio, steep topography, permeable sediments and high rainfall, oceanic islands, may have the potential for disproportionally large SGD fluxes into the ocean compared to river inputs. Since SGD is driven under different timescales and processes …
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The role of zooplankton in cyanobacteria bloom development in Australian reservoirs
… direct (grazing) and indirect (nutrient regeneration) effects of zooplankton on C. raciborskii were further examined in laboratory experiments (Chapter 3). These laboratory experiments were then scaled up to mesocosms (~500 litres), where in situ C. raciborskii growth was examined under …
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The marine biogeochemistry of dissolved organic carbon and dissolved organic nutrients in the Atlantic Ocean
… production and consumption processes. Concentrations of<br/>DOM in the surface oceans, therefore, are controlled by both physical and biological<br/>processes. This research investigates the biological factors that control the distributions<br/>of DOC, DON and DOP in surface waters, the …