✦ LIBER ✦

Structural Compositions of Pelagic Communities in the River Warnow and their Changes

✍ Scribed by Rhena Schumann; Catrin Sievert; Ulrich Schiewer

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 634 KB
Volume: 77
Category: Article
ISSN: 1434-2944
DOI: 10.1002/iroh.19920770202

No coin nor oath required. For personal study only.

✦ Synopsis

The phytoplankton and heterotrophic microbial communities from the Oberwamow and Unterwamow were analyzed from November 1987 to May 1988. The production potential of the microorganisms was quantified in laboratory experiments. On the average, phytoplankton accounted for 73 % of the total biomass in the Obenvamow and 59 % in the Untenvamow. The corresponding figures for bacterial biomass were 24 % and 33 %, respectively. If the nutrient supply is unlimited and phytoplankton biomass predominates, the development of primary producers in eutrophic to polytrophic waters is not regulated by metazooplankton. Top-down regulation is possible only if prevailing conditions limit the growth of the dominant phytoplankton species.

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