Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1023/A:1004060732467
Volltext Shareable Link
Titel (primär) Dynamics of planktonic food webs in three mining lakes across a pH gradient (pH 2-4)
Autor Wollmann, K.; Deneke, R.; Nixdorf, B.; Packroff, G.
Quelle Hydrobiologia
Erscheinungsjahr 2000
Department GM
Band/Volume 433
Seite von 3
Seite bis 14
Sprache englisch
Abstract Acidic mining lakes (ML) in Lusatia (Germany) are characterised by their geogenically determined chemistry. The present study describes the structure, main components and relationships within the food webs of three acidic mining lakes with different pH values (ML 111: pH 2.6; ML 117: pH 2.8; ML Felix: pH 3.6) in order to show their typical characteristics. The investigation covered the period 1995-1997. The number of species and the biomass are both low, but increase with increasing pH. Planktonic components in the most acidic ML 111 (pH 2.6-2.9) comprise bacteria, Ochromonas spp. and Chlamydomonas spp. and a few rotifers (E. worallii, C. hoodi). Heliozoans are the top-predators. In ML 117 (pH 2.8-3) Gymnodinium sp., ciliates, the rotifer B. sericus and the pioneer crustacean Chydorus sphaericus join the pelagial community. Heliozoans were not found in ML 117 or ML Felix (pH 3.4-3.8). ML Felix had the most taxa. The benthic food chain of all three lakes includes phytobenthic algae as producers, chironomids as primary consumers and corixids as top predators in the profundal. Corixids predate on small cladocerans inhabiting the pelagial in lakes with a pH above 2.8 such as ML Felix. They invade the pelagial and act as a connecting link between the benthic and the pelagic food chains, which are isolated in lakes with a lower pH. Occasionally primary producers and consumers were abundant in all three lakes. These organisms do not depend on the degree of acidity, but on the availability of essential ressources. Mass variations covered up any seasonal variation in the extremely acidic ML 111 (0.9 mm(3) l(-1)), while in the other two lakes seasonal patterns of biomass were found.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=7799
Wollmann, K., Deneke, R., Nixdorf, B., Packroff, G. (2000):
Dynamics of planktonic food webs in three mining lakes across a pH gradient (pH 2-4)
Hydrobiologia 433 , 3 - 14 10.1023/A:1004060732467