Abstract
The seasonality of nutrients and chlorophyll a in Lake Erken (Sweden) was monitored during 1994 to 2001 (warm period) and compared to the time period 1975 to 1979 (cold period). The coupling to weather conditions and potentially influencing factors, such as water temperature, light conditions, and stratification were evaluated. During the warm period the ice cover period was considerably shorter and the ice breakup about one month earlier than in the cold period. The decrease in thickness and duration of snow cover resulted in considerably better light conditions during winter, favouring phytoplankton growth under the ice. The nitrate concentrations were much lower in late winter during the warm period. There were elevated phosphate and ammonium concentrations in the hypolimnion during August. Significantly higher phosphate and chlorophyll a levels were noticed in autumn during the warm period, compared to the cold period.
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Pettersson, K., Grust, K., Weyhenmeyer, G. et al. Seasonality of chlorophyll and nutrients in Lake Erken – effects of weather conditions. Hydrobiologia 506, 75–81 (2003). https://doi.org/10.1023/B:HYDR.0000008582.61851.76
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DOI: https://doi.org/10.1023/B:HYDR.0000008582.61851.76