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  • diatoms  (2)
  • Springer  (2)
  • Blackwell Science Ltd
  • Elsevier
  • National Academy of Sciences
Document type
Keywords
Publisher
  • Springer  (2)
  • Blackwell Science Ltd
  • Elsevier
  • National Academy of Sciences
Years
  • 1
    Electronic Resource
    Electronic Resource
    The relationship between sedimentary diatom assemblages and lakewater pH in 35 Quebec lakes, Canada (1988)
    Springer
    Journal of paleolimnology 1 (1988), S. 23-38 
    Details
    ISSN: 1573-0417
    Keywords: diatoms ; paleolimnology ; diatom-inferred pH ; acidification ; Quebec
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Surface sediment diatoms from 35 soft-water lakes in southern Quebec were studied to examine the relationship with lakewater pH. The lakes ranged in pH from 5.25 to 7.66. The species composition and the relative abundance of diatoms in the study lakes was found to be closely related to pH and/or factors closely associated with pH. Predictive models were developed to infer lakewater pH using simple linear regression equations of index alpha, index B, and multiple regressions using pH preference categories. Among the predictive models examined here, the multiple regression technique provided the highest correlation coefficient (r2=0.88) and the lowest standard error (±0.26 of a pH unit) in computing diatom-inferred pH. This model appears to be the most appropriate to reconstruct lake pH histories in Quebec region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202191
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sedimentary diatom assemblages and their utility in computing diatom-inferred pH in Sudbury Ontario lakes (1988)
    Springer
    Hydrobiologia 169 (1988), S. 135-148 
    Details
    ISSN: 1573-5117
    Keywords: diatoms ; paleolimnology ; inferred-pH ; Sudbury ; pH reconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Surface sediment diatoms from 30 Sudbury lakes were analyzed to establish a relationship between diatoms and limnological characteristics of these lakes. Factor analysis of various chemical and physical variables suggested that most of the variance was associated with the pH, pH-metal, and conductivity factors. Factor analysis of common diatom taxa indicated that the distribution of most of these diatoms is closely related to lake water pH and/or pH related factors. Regression analysis of various pH indicator assemblages with measured lake water pH also demonstrated significant relationships. Among the transfer functions employed to compute diatom-inferred pH, multiple regressions using pH indicator assemblages proved to be the best. Using this method an accuracy of about 0.3 pH unit can be achieved, even for lakes which have received large trace metal inputs concurrent with increase in acidity. The presence of planktonic diatoms in acidic lakes suggests that the widely accepted hypothesis that planktonic diatoms are greatly reduced in waters at pH below 5.6 is not always true.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007306
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    Paper (German National Licenses)
    Fulltext
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