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Acidification of the humic Lake Skjervatjern; effects on the volume and species composition of phytoplankton

Conference · · Environment International; (United States)
OSTI ID:7065875
 [1]
  1. Norwegian Institute for Water Research, Oslo (Norway)
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This paper presents the effects of the experimental acidification on the volume and composition of phytoplankton from the investigations carried out in Lake Skjervatjern in connection with the HUMEX project. The results of the phytoplankton analysis are presented from Basin A, the acidified basin, and Basin B, the control, two years before the acidification started and two years during the acidification. In Basin B, the control basin, the succession of the main groups of phytoplankton throughout the growth season remained almost identical from year to year in the investigation period. The development of the phytoplankton was almost the same in the two basins before the acidification started. The results from the acidified Basin A in 1991 and 1992 show marked changes and an almost immediate response in the phytoplankton composition and percentage of the main algae groups, compared to the reference basin. The percentage of the green algae decreased, especially the species Oocystis submarina v. variabilis, while the dinoflagellate Peridinium inconspicuum and the cryptomonads increased in number and percentage of the total volume in the acidified basin. The total volume and the primary production measurements show an increase in Basin A compared to the control in the first year of acidification treatment (1991), but a decrease in the next year. 30 refs., 6 figs., 1 tab.
OSTI ID:
7065875
Report Number(s):
CONF-9306371--; CNN: STE-CT90-0112; NV5V-CT92-0142
Conference Information:
Journal Name: Environment International; (United States) Journal Volume: 20:3
Country of Publication:
United States
Language:
English

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Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACIDIFICATION
AQUATIC ORGANISMS
BIOLOGICAL EFFECTS
DEVELOPED COUNTRIES
EUROPE
FIELD TESTS
LAKES
NORWAY
PHYTOPLANKTON
PLANKTON
PLANTS
POPULATION DYNAMICS
SCANDINAVIA
SURFACE WATERS
TESTING
WESTERN EUROPE