Podrobnosti záznamu

Název
    Limnological study of Plešné Lake in 1994-1995
Údaj o odpovědnosti
    Josef Hejzlar, Jiří Kopáček, Jaroslav Vrba, Renata Čížková, Jaroslava Komárková, Karel Šimek
Další názvy
    Limnologická studie Plešného jezera v letech 1994-1995
Autor
    Čížková, Renata
    Hejzlar, Josef
    Komárková, Jaroslava
    Kopáček, Jiří
    Šimek, Karel
    Vrba, Jaroslav
Jazyk
    česky
Zdrojový dokument - seriál
    Silva Gabreta : sborník vědeckých prací ze Šumavy
Svazek/č.
    Roč. 2
Strany
    s. 155-174
Rok
    1998
Poznámky
    3 obr., 6 tab., 4 s.bibl.
    Zkr. název ser.: Silva Gabreta
Předmětová skupina
    acidifikace
    dusík
    fosfor
    glaciální modelace
    hydrochemie
    jezero
    kovy těžké
    plankton
    sedimentace lakustrinní
    sedimentace recentní
    síra
    uhlík
    znečištění
Geografické jméno
    ČR-Čechy
    Plešné jezero
Klíčové slovo
    1994-1995
    Lake
    Limnological
    Plešné
    Study
Abstrakt (anglicky)
   Chemistry and biology of water, and sediment composition were studied in an acidified (pH 4.5-5.0) mountain lake with forested catchment in south-western Bohemia. The comparison of water chemistry in tributaries and the lake showed that in-lake processes decreased acidity of inflowing water and its concentrations of dissolved organic matter (DOM), nitrate, total nitrogen, phosporus and aluminium, and incrased the concentration of ammonium. Seasonal stratification patterns corresponded to dimictic eutrophic lakes with anoxia in hypolimnion during both winter and summer stratification periods, however, the concentrations of chlorophyll a, phytoplankton and total phosphorus corresponded to meso- or oligotrophy. No release of dissolved reactive phosphorus from lake sediments was detected even during deeply anoxic conditions.
   Phosphorus fractionation in a surficial sediment sample demonstrated that sediment P was predominantly combined with hydroxyaluminium species and, thus, not liable to be released during changes of redox conditions. Ca, Al, Zn, Cu, and Cd concentrations showed vertical differences along the sediment vertical profile demonstrating acidification of the lake in the last decades. Acid-tolerant species of green algae (Koliella, Carteria, Chlamydomonas), dinoflagellates (Peridinium), cyanobacteria (Pseudanabaena), and several chrysophytes (only in spring) dominated in the phytoplankton community. High alkaline phosphatase activity and low ratio between chlorophyll a and phytoplankton biomass indicated severe limitation of phytoplankton by phosphorus. Macrozooplankton were sparse consisting of low densities of two crustaceans, Heterocope saliens and Acanthocyclops vernalis, and few rotifers.
   Bacterioplankton were likely responsible for partial decomposition and utilisation of polymeric DOM, serving also as food source for protists
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    25. 3. 2008
Datum importu
    8. 8. 2012