Microbial Ecology of Lake Plußsee by Hans-Jürgen Krambeck, Dieter Albrecht, Barbara Hickel

By Hans-Jürgen Krambeck, Dieter Albrecht, Barbara Hickel (auth.), Jürgen Overbeck, Ryszard J. Chróst (eds.)

Lake Plußsee is a small eutrophic kettle lake in northern Germany. since it is sheltered and has no influx from rivers, the Plußsee shows strong stratification and is mainly compatible for limnological reviews. This booklet provides the result of large examine carried out at the ecophysiology of microorganisms - mostly micro organism - on the Plußsee over the last a number of many years. It starts with 3 chapters at the normal limnological nation of the lake: actual components, inorganic foodstuff, plankton composition and succession, fish fauna, and so forth. those chapters are by way of discussions of dissolved natural topic and photosynthetic construction of natural topic through phytoplankton. the rest of the ebook addresses the dynamics of constitution, functionality and metabolism of the microorganisms within the Plußsee.

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Albrecht DOP pool requires an extracellular hydrolysis step by alkaline or acid phosphatase (Chr6st and Overbeck 1987, Francko 1984; Chapter 6, this volume). Elemental Composition of DOM The relative abundance of carbon, nitrogen, and phosphorus in suspended and dissolved forms in aquatic environments has been the subject of research and discussion for a quarter century (Vollenweider 1968, Levine and Schindler 1992). Most of the research has focused on the ratio of those elements in inorganic constituents and their relative contribution to eutrophication and lake water productivity.

16 limnetic portion of zooplankton biomass is missing, and the biomass curve indicates only the epilimnetic response and therefore has a more slender shape (Hofmann 1975). Unlike the 1969 succession, in 1981 a series of three biomass maxima were observed during the summer. The first one, distinct from preceding maxima, was produced not by rotifers but by a high abundance of adult Eudiaptomus gracilis. Hence, it was determined by the generation time of this species and the conditions the copepodides were exposed to in the preceding period rather than by the conditions in the middle of June when the adults appeared.

Chemical Characterization of the DO M In lacustrine environments DOM is a mixture of thousands of different organic compounds with different structures, sizes, concentrations, and reactivities. Among the organic solutes in the DOM, dissolved amino acids (DAA), dissolved carbohydrates (DCHO), and dissolved organic acids (DOAc) are the most extensively studied. Knowledge of their quantities and contribution to the DOC pool is A B ....... c2. U 1>1) 20 E , :x: , '-' 0 ~ 0 .. amp/ing . 5. Annual and vertical distribution of (A) dissolved total amino acids (DTAA), (B) dissolved total carbohydrates (DTCHO), and (C) dissolved total polyphenols (DTPPhOH) in the PluBsee in 1989 and 1976.

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