Phytoplankton production in relation to physico-chemical conditions in a small, oligotrophic subarctic lake in South Greenland |
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Authors: | Peter Mæhl |
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Institution: | Freshwater Biological Laboratory, Univ. of Copenhagen, Helsingørsgade 51, DK-3400 Hillerød, Denmark |
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Abstract: | Phytoplankton production and physico-chemical parameters were measured during the summers of 1976 and 1977 in Lake 95 at 60°52'N, 46°01'W (area 8 ha, z 6.9 m). The duration of lake stratification during summer was weather dependent. Concentrations of total-CO2 ranged from 2.04 mg l−1 (surface) to 4.02 mg l−1 (bottom during stratification). Nutrient concentrations were generally low, and systematic seasonal variation could not be detected with certainty. Vertical distribution of primary production typically showed a distinct maximum followed by a decline with depth. The low production, both per unit area (max. 60 mg C m−2 d−1) and per unit volume (max, 14.3 mg C m−3 d−1), and the annual production of 4.7 g C m−2 classified the lake as extremely oligotrophic. |
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