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  • 1
    Electronic Resource
    Electronic Resource
    SOURCES OF VARIABILITY IN PHOSPHORUS AND CHLOROPHYLL AND THEIR EFFECTS ON USE OF LAKE SURVEY DATA (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 20 (1984), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Summer lake survey measurements of total phosphorus (TP) and chlorophyll a (CHLa) from 188 reserviors and natural lakes in the midwest were analyzed to determine the magnitude of major sources of variability. Median variance among replicate samples collected at the same location and time was about 7-8 percent of the mean for both TP and CHLa. Median observed temporal variability within summers was 27 percent of the mean for TP and 45 percent of the mean for CHLa. Median values of year-to-year variance in average TP and CHLa were 22 percent and 31 percent of the mean, respectively. A range of approximately two orders of magnitude was observed among individual estimates of variance in each of these categories. The magnitude of observed temporal variability was affected only slightly by variance among replicate samples on individual days and was weakly correlated with the length of time during which samples were collected from individual lakes. Observed temporal variation was similar between reservoirs and natural lakes when variances were calculated with logtransformed data. The magnitude of temporal and year-to-year variance can severely limit the power of statistical comparisons of TP and CHLa means, but has less effect on establishing relative rankings of lake means, Sources and relative magnitude of variability are important in the use of TP and CHLa data in regression models and in the planning of lake surveys and subsequent data analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1984.tb04722.x
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  • 2
    Electronic Resource
    Electronic Resource
    FLOW-THROUGH MICROCUVETTE FOR FLUOROMETRIC DETERMINATION OF CHLOROPHYLL (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 20 (1984), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: This paper describes a flow-through microcuvette for determination of chlorophyll with the Turner Designs model 10 fluorometer. The device approximately doubles the speed of repetitive chlorophyll determinations. With a single-standard calibration procedure, chlorophyll concentrations in the approximate range of 0.01-2.0 ug/mL (in solvent extracts) can be determined with a relative error of less than 3 percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1984.tb04763.x
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  • 3
    Electronic Resource
    Electronic Resource
    Fate of radiolabeled sodium pentachlorophenate in littoral microcosms (1983)
    Springer
    Bulletin of environmental contamination and toxicology 30 (1983), S. 206-213 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Conclusions Degradation of PCP to CO2 has been demonstrated in several laboratory experiments in which soil or microorganisms derived from soil were used (Kaufmann 1978). In view of the final residue distribution and the detection of14C-CO2 in this experiment, it appears that microorganisms may have been responsible for the degradation and subsquent mineralization of PCP. Earlier, Knowlton (1981) found that14C-PCP added to soils used in this experiment degraded in less than 9 weeks, and that 2,3, 4,5-tetrachlorophenol was one of the main degradation products. Although14C-PCP was accumulated by macrophytes, this pathway accounted for only a small percentage of the total loss of14C-PCP from the water. The binding to or photosynthetic incorporation of14C-PCP residues into plant proteins and lignin may account for a large share of the radioactive residues observed in macrophyte samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01610122
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  • 4
    Electronic Resource
    Electronic Resource
    Uptake of lead from aquatic sediment by submersed macrophytes and crayfish (1983)
    Springer
    Archives of environmental contamination and toxicology 12 (1983), S. 535-541 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Uptake of lead (Pb) by submersed aquatic macrophytes and crayfish exposed to artificially contaminated pond sediment was measured under laboratory conditions. Macrophytes accumulated Pb in root tissue and foliage. Internal transport of Pb by plants was not detected. Senescent macrophytes accumulated more lead than live plants. Crayfish exposed to contaminated sediment accumulated Pb principally through adsorption to the exoskeleton and lost Pb through molting, although internal uptake and elimination without molting was measurable. Exposure to Pb leached from sediment, surface to weight ratios, and frequency of molting seem to influence Pb uptake by crayfish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01056549
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  • 5
    Electronic Resource
    Electronic Resource
    Limnological reconnaissance of waterbodies in central and southern Nepal (1989)
    Springer
    Hydrobiologia 184 (1989), S. 171-189 
    Details
    ISSN: 1573-5117
    Keywords: Nepal ; limnology ; nutrient limitation ; ionic salinity ; chlorophyll
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ionic composition of waterbodies in central and southern Nepal sampled in spring 1985 differed from that normally found in freshwater. Distinguishing characteristics were: 1) predominance of bicarbonate among the anions — accounting for 〉 90% of the negative equivalents in two-thirds of the waterbodies, 2) the near absence of sulfates — accounting for 〈 1 % of the anions in half the samples so that chloride exceeded sulfate (as meq/L) in three-fourths of the waters tested and 3) calcium was the dominant cation, although in certain waters the relative proportion of either magnesium or the monovalent cations was much higher than the world average. Regional patterns in water chemistry were apparent and are largely explained by differences in local geology, inputs from artesian wells or extensive use by humans. Most ionic salinity values were 〈400 mg/L. Using conventional criteria to assess trophic state, most water-bodies were eutrophic or hypereutrophic when judged by total phosphorus and chlorophyll content but as a whole the lakes sampled were low in nitrogen. Nitrogen: phosphorus ratios (generally 〈 10) and a significant empirical relation for chlorophyll-nitrogen provide evidence that nitrogen limited algal biomass. Secchi transparency values indicate light regimes were affected by nonalgal materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027026
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  • 6
    Electronic Resource
    Electronic Resource
    Limnological reconnaissance of waterbodies in central and southern Nepal (1989)
    Springer
    Hydrobiologia 184 (1989), S. 171-189 
    Details
    ISSN: 1573-5117
    Keywords: Nepal ; limnology ; nutrient limitation ; ionic salinity ; chlorophyll
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ionic composition of waterbodies in central and southern Nepal sampled in spring 1985 differed from that normally found in freshwater. Distinguishing characteristics were: 1) predominance of bicarbonate among the anions — accounting for 〉 90% of the negative equivalents in two-thirds of the waterbodies, 2) the near absence of sulfates — accounting for 〈 1 % of the anions in half the samples so that chloride exceeded sulfate (as meq/L) in three-fourths of the waters tested and 3) calcium was the dominant cation, although in certain waters the relative proportion of either magnesium or the monovalent cations was much higher than the world average. Regional patterns in water chemistry were apparent and are largely explained by differences in local geology, inputs from artesian wells or extensive use by humans. Most ionic salinity values were 〈400 mg/L. Using conventional criteria to assess trophic state, most water-bodies were eutrophic or hypereutrophic when judged by total phosphorus and chlorophyll content but as a whole the lakes sampled were low in nitrogen. Nitrogen: phosphorus ratios (generally 〈 10) and a significant empirical relation for chlorophyll-nitrogen provide evidence that nitrogen limited algal biomass. Secchi transparency values indicate light regimes were affected by nonalgal materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392954
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    Paper (German National Licenses)
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