Paleoecological reconstruction of changes in the productivity of a small, meromictic lake in Southern Ontario, Canada

The biota, organic matter and paleopigments of Crawford lake were studied quantitatively in a 35 cm deep sediment core removed from the centre. Changes in stratigraphic sediment pigments indicated changes in lake productivity in the last 300 years. Land clearance had the greatest effect on paleoprod...

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Bibliographic Details
Published in:Hydrobiologia 1988-01, Vol.169 (3), p.293-306
Main Authors: RYBAK, M, DICKMAN, M
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
Geochemistry
Marine and continental quaternary
Soil and rock geochemistry
Surficial geology
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Summary:The biota, organic matter and paleopigments of Crawford lake were studied quantitatively in a 35 cm deep sediment core removed from the centre. Changes in stratigraphic sediment pigments indicated changes in lake productivity in the last 300 years. Land clearance had the greatest effect on paleoproductivity; deforestation during the last century was correlated with an increase in algal pigments deposited in the lake's sediments. During the last 10 years the lake had become eutrophic; a dramatic increase in accumulation of chlorophyll derivatives correlated with a dramatic increase in the number of visitors to the lake.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00007552