The Structure of a Macroinvertebrate Community in a Northern German Lake Outlet (Lake Belau, Schleswig-Holstein) with Special Emphasis on Abundance, Biomass and Secondary Production
✍ Scribed by Rainer Popperl
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 932 KB
- Volume
- 81
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
The structure of macroinvertebrate communities was studied at I I sampling sites of the outlet of Lake Belau in the lowlands of northern Germany. To describe the structures of macrobenthic animal communities three different units were examined: abundance, biomass, and secondary production.
112 taxa were collected from the entire stream. The numbers of species ranged from 3 I (tine sand) to 70 (submerged macrophytes). For the stream, average macroinvertebrate density was I8.400 ind. m-?. Density was highest at the macrophytes amounting to 35,630 individuals per m', and lowest in the pure sand with only 3,900 ind. m-'. Average biomass (dry mass) was 194 g DM m'-? varying from 9.8 (peat) to 38 Ig DM m-2 (gravel with mollusk shells near the upstream lake). For the stream, average annual production was 129 g DM m-' varying from 15 (peat) to 286 g DM m-2 (macrophytes).
The highest values for each unit were found in stream sections with gravel and submerged macrophytes. Lower values occured in sections that contained peat and sand. Usually, a single structure of the macroinvertebrate community was dominated by less than ten taxa, which varied at each sampling site depending on the units observed.
August. The minimum temperature of -1.4OC was measured on Feb. 6, 1989