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  • 1
    Electronic Resource
    Electronic Resource
    Composition and abundance of phytoplankton in tributaries of the lower Colorado river, Grand Canyon region (1979)
    Springer
    Hydrobiologia 66 (1979), S. 81-93 
    Details
    ISSN: 1573-5117
    Keywords: algae ; phytoplankton ; Colorado River ; Grand Canyon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytoplankton distribution and abundance in eleven tributaries of the Colorado River within the Grand Canyon were investigated from April, 1975 to June, 1976. During this period a total of 56 genera and 156 species of phytoplankton was identified. Phytoplankton species of the individual tributaries were quite distinct, with only four diatom species, Diatoma vulgare, Navicula tripunctata, Nitzschia linearis and Synedra ulna, common to all the tributaries. Bright Angel Creek, Shinumo Creek and Elves Chasm were the tributaries with the most diverse algal flora, whereas Vaseys Paradise, Tapeats Creek, Deer Creek and Havasu Creek showed the lowest species richness. Elves Chasm and Diamond Creek had the highest phytoplankton numbers. Phytoplankton abundance and species richness appeared to be influenced by high turbidity, current velocity, fluctuating water levels and age of the water. Some of the dominant algal species, Biddulphia laevis, Cocconeis pediculus, Cymbella ventricosa, Epithemia sorex, Gomphonema parvulum and Synedra ulna, showed significant correlations with specific physico-chemical characteristics of the tributaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019143
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The physical-chemical limnology of a desert reservoir (1977)
    Springer
    Hydrobiologia 53 (1977), S. 117-129 
    Details
    ISSN: 1573-5117
    Keywords: limnology ; desert reservoir ; water chemistry ; phytoplankton ; nutrients ; trace elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The physical-chemical limnology of a desert lake in central Arizona was investigated from February 1971–July 1973. The reservoir was found to be a warm-monomictic, eutrophic lake which exhibited pronounced thermal stratification during the summer months. Surface water temperatures ranged from a minimum of ca. 9 C in January to a maximum near 30 C in July–August. Chemically the lake may be described as a hard water lake of moderately high alkalinity and salinity. The concentration of the principal ions was affected significantly by precipitation run-off. The primary nutrients N and P were subject to considerable seasonal variability, being influenced most by precipitation and phytoplankton abundance. Trace element concentrations were low and showed comparatively little fluctuation during the study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029290
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  • 3
    Electronic Resource
    Electronic Resource
    Nutrient limitation of phytoplankton in a central Arizona reservoir (1976)
    Springer
    Hydrobiologia 51 (1976), S. 219-224 
    Details
    ISSN: 1573-5117
    Keywords: nutrients ; nutrient limitation ; phytoplankton ; phosphorus ; nitrogen ; carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of added nutrients nitrogen, phosphorus and carbon on the phytoplankton of a small recreational reservoir in central Arizona was investigated during the summer, 1974. Polyethylene bags were used to isolate lake water and the natural populations for the addition of nitrogen, phosphorus and carbon individually and in combination. A large increase in phytoplankton numbers, extractable chlorophyll, pH and dissolved oxygen occurred only in bags to which both nitrogen and phosphorus were added, suggesting that both nitrogen and phosphorus levels were limiting to the primary producers. Little alteration in species composition resulted from the addition of the above nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005747
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