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Vertical distribution of benthic macroinvertebrates in a meromictic lake (Lake Czarne, Drawieński National Park)

Klimaszyk P., Heymann D.

Oceanological and Hydrobiological Studies

2010

Vol. 39, No.4

99-106

Investigations of the distribution of benthic macroinvertebrates in Lake Czarne were conducted in fall 2005 and spring 2006. Samples were taken in three transects (at a depth of 0.5 m and at 5 m intervals). It was noted that macrobenthos only inhabit depths to 10 m. Laminar sediments from 15 m to 29 m indicate that macrobenthos never inhabit the deepest part of the lake in spite of temporary oxygen abundance (between 15 and 20 m during the winter and spring mixing periods). The largest diversity and biomass of macrozoobenthos was observed in the littoral zone at a depth of 0.5 m. At a depth of 5 m in the characean stands and at a depth of 10 m the number and biomass of benthic macroinvertebrates were significantly smaller. The reason for the decrease of benthos density seems to be gradual oxygen depletion.

Meromictic Lake Czarne in the Drawieński National Park

Kraska M., Klimaszyk P., Piotrowicz R.

Oceanological and Hydrobiological Studies

2006

Vol. 35, No.1

55-67

The results of long-term research confirm that Lake Czarne in the Drawieński National Park is meromictic due to natural factors, not human influence. The lake is located in a large natural basin, so the tall forest stands covering the steep slopes surrounding the lake protect it from strong winds. Its small surface area and relatively large mean and maximum depth also limit the possibilities of water mixing in the lake.