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2 Oceanological and Hydrobiological Studies

2 2010

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

100%

Klimaszyk P. , Heymann D.

Oceanological and Hydrobiological Studies

2010

tom 39

nr 4

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

100%

Klimaszyk P. , Heymann D.

Oceanological and Hydrobiological Studies

2010

tom 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.