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 35 for “"Chlorophyll concentrations"”.
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Spatial and temporal variability of chlorophyll concentrations from nimbus-7 coastal zone colour scanner data in the Benguala upwelling system and the sub-tropical convergence region south of Africa
… south of Africa. High annual values (5mg m⁻³) of chlorophyll occurred in the Benguela shelf region, typical of other upwelling systems in the world ocean, and the data shows a strong interannual signal in the seven years of composited data from 1978-1985, with maxima in 1982. Two distinct regimes …
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Microscale Variation in Light Intensity and its Effects on Growth of Juveniles of the Temperate Coral, Oculina Arbuscula
… was to examine the effects of substrate angle on chlorophyll concentrations, algal densities and juvenile growth of the temperate scleractinian coral, Oculina arbuscula. Light intensity was quantified at different substrate slopes on live-bottom reefs at ~18 m depth in and around Grays Reef …
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Temporal and Spatial Variability of Phytoplankton Biomass in Coastal Mississippi Waters
<p>Chlorophyll concentrations were measured in western Mississippi coastal waters to determine the spatial and temporal variability of phytoplankton. Nutrients (nitrate, silicate, phosphate), river discharge, temperature, salinity, stratification, tides, currents and winds were measured in concert …
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Using low cost components to determine chlorophyll concentration by measuring fluorescence intensity
… the core of this fluorometer's functionality, chlorophyll's fluorescence characteristics and origins are discussed. Special attention is given to the variability of chlorophyll fluorescence as it has a big influence on measurements. Experimental procedures and data are provided to show why each …
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Effects of Excessive Soil Phosphorus on Pinus taeda L. Nutrient Uptake, Survival, and Growth
… form. These fields often acquired high P soil concentrations as a result of decades of poultry litter applications. While excessive P has been recognized in horticulture and agronomy research to adversely affect micronutrient uptake in plants causing reduced growth or even mortality, its …
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Variación anual de la abundancia de bacterias y de la contribución del nano y picofitoplancton a la producción fitoplanctónica total en el Golfo de Cádiz
Chlorophyll and phytoplankton distribution and concentration were studied during 2014 and 2015 in the Gulf of Cádiz. The highest chlorophyll concentrations are found at coastal stations in spring during both years. Pico and nanophytoplankton are the main contributor to total chlorophyll, with …
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Effects ofUltraviolet Radiation on Newly Settled Recruits of the Reef-building Coral <em>Porites astreoide</em>
… such as reduced settlement, survival, and lower chlorophyll concentrations. Previous studies indicate that UVR may play a role in survival during dispersal of coral larvae, but its effects on newly settled coral recruits have not previously been investigated. The purpose ofthis study was to …
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Inter-annual and decadal variation in the pelagic marine ecosystem of the Yellow and East China seas
<p>The water-leaving radiance measurements and chlorophyll concentrations of the Coastal Zone Color Scanner (CZCS) and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) were compared to investigate decadal trends in the Yellow and East China Seas (YECS). A unified bio-optical algorithm was …
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Limnology of Selected South Dakota Lakes
… lakes and among lakes. Dissolved oxygen concentrations ranged from near saturation to less than the recommended minimum for fish life. All likes studied were basic ranging from a pH of 7.1 to 11.3. Specific conductance of lakes occupying open basins was lowest in the un-glaciated area …
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Applied Biotechnology for in Vitro Production of Carica Papaya L
… highest multiplication rates, highest leaf chlorophyll concentrations, and significantly improved shoot quality were achieved at 30 $\mu$mol m$\rm\sp{-2}s\sp{-1}$ irradiance when two iron chelate sources, FeEDTA and FeEDDHA, were combined (each at a 100 $\mu$M concentration) in the medium. A …
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Load reduction and invasive mussel effects on eutrophication dynamics in Saginaw Bay, Lake Huron
… Saginaw Bay; there was a consistent decrease in chlorophyll concentrations by ~46%, and total phosphorus concentrations by ~25%, and an increase in secchi depths by ~15% over ~20 year invasion of mussels. A comparison of chlorophyll-phospohrus relationship between pre- and post-invasion periods …
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Application of machine learning methods to predict phytoplankton blooms and determine microbial biomarkers using marine microbiomes
… as bloom or normal depending on the total chlorophyll concentrations. The resulting dataset was highly dimensional (166 instances, 7593 features) and imbalanced (31 instances bloom, 135 – normal). To reduce dimensionality, biological features with relative abundances below 0.01 were …
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Predation/disturbance effects of greater flamingos (Phoenicopterus ruber) on the benthic communities of two Southern African lagoons
… Sandwich Harbour, which was the only site where chlorophyll concentrations did not change significantly. Sediment particle size composition was unaffected at all sites. Eh and organic content of sediments changed least subtidally; pH was affected by the treatment at both Walvis Bay sites, but not …
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Improving Estuarine Water Quality in South Florida: A Quantitative Evaluation of The Efficacy of a Local Nutrient Ordinance
… on total nitrogen and total phosphorus concentrations within the estuarine canal system and (2) the relationship between post-ordinance nutrient and chlorophyll-a concentrations. The results showed mean total nitrogen concentrations declined from pre-to post-ordinance calendar years in …
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The contribution by phytoplankton, bacteria and detritus to a rocky shore ecosystem
… in t."'1ese stocks. In spring and summer chlorophyll levels were la, 1 - 2 µg/1. Due to the extrerrely lcw nitrate concentrations ( < 2 µg at/1) and to a lesser extent, silicates ( < 6 µg at/1) , little autochthonous phytoplankton production was recorded over this period. Concentrations of …
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The development and decline of phytoplankton blooms in the southern Benguela upwelling region
… was investigated in terms of changes in chlorophyll � concentrations in the euphotic zone. The build up and decline of the primary phytoplankton (diatom) bloom in newly upwelled water occurred within 6-8 days. The initiation of blooming appears to be controlled by the stability of the …
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Effects of Hydrologic Connection on Physicochemical Conditions and Algal Properties in Backwaters of the Lower Mississippi River
… elevated turbidity, elevated NO3-N and PO 4-P concentrations, and had relatively low chlorophyll concentrations. As the river elevation declined, the backwaters became partly or fully disconnected from the river, resulting in an increase in light as suspended sediments settled out of the water …
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Temporal and spatial changes in the abundance and size structure of copepods in the southern Benguela : 1988 to 2000
… variability in copepod abundance: season, area, chlorophyll concentrations and sea surface temperature. The southern Benguela was divided into six sub-areas. Results of the GLMs show the largest abundances of copepods on the northern and central West Coast, fewer copepods on the central and …
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The Luminometer: A Sensitive Instrument for Measuring Low Amounts of Oxygen, and Some Applications to Problems Involving the Measurement of Photosynthesis
… they were discolored by abnormal quantities of chlorophyll precursors and had only about 1% of the normal chlorophyll concentrations. Mutant 610, a carotenoid-containing mutant which, unlike normal Chlorella, cannot synthesize chlorophyll in the dark, was found to green in the light. During …
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Bio-Optical Properties of the Arctic Waters: Empirical and Theoretical Observations
… August 2000 in the Beaufort and Chukchi Seas. Chlorophyll <em>a</em> concentration (Chl) ranged from 0.068 to 18.51 mg chl m<sup>−3</sup>. Both total particulate and phytoplankton absorption at 443 nm were closely correlated with chlorophyll concentration. There is no strong correlation between …
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