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Response rate of submerged macrophyte chlorophyll content under changing light conditionsNARA Subscribed
Lake browning, i.e., a gradual and long-term increase in the water colour, is a recognized and topical water quality problem that has received much less attention in water protection than eutrophication. Thus, new bioindicators that respond to environmental stress are needed to monitor lake browning. Recent study suggests that the chlorophyll content of macrophytes is a promising indicator for assessing lake browning, yet litt...
The water colour of numerous lakes is increasing, with consequences for biotic communities. The effects of water colour on the abundance of fish in boreal lakes were examined by evaluating gillnet catches in 78 lakes with a water colour range from 18.9 to 380.0 mg Pt L −1 . In all, 22 different fish species were captured. Perch ( Perca fluviatilis ) and roach ( Rutilus rutilus ) were the most abundant species. Water colour had...
The spatial and temporal variation of Nuphar lutea chlorophyll content was studied in 12 small lakes in Finland to clarify the bioindicator potential of N. lutea chlorophyll content for monitoring lake brownification. Significant in-lake variation in water colour and total phosphorus concentration was observed in a few study lakes. At highest, the in-lake variation for water colour was 13% and for total phosphorus concentratio...
Seasonal fluctuations in pigment content of macrophytes: implications for monitoring brownificationNARA Subscribed
Seasonal variations of floating-leaved macrophyte Nuphar lutea chlorophyll content were studied in lakes with different water quality. The aim was to investigate whether chlorophyll content of the plants could be used as an indicator of brownification. The relationship between chlorophyll a and b (CHL a : b ) of the petioles decreased with increasing water colour. The relationship between CHL a : b and turbidity was less clear...
Effects of dissolved organic carbon gradient on epilimnetic zooplankton communities in lakesNARA Subscribed
Lake browning is expected to change aquatic ecosystems considerably. The changes that may occur in zooplankton communities with a high concentration of dissolved organic carbon (DOC) are little studied and not yet sufficiently understood. We studied zooplankton communities in Finland in 27 lakes with a wide DOC range. We explored how zooplankton diversity and biomass vary along a DOC gradient and how species belonging to diffe...
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