Chrysophytes and chlamydomonads: pioneer colonists in extremely acidic mining lakes (pH <3) in Lusatia (Germany)

摘要: Twenty-three extremely acidic (pH between 2.5 and 3.5) mining lakes in Lusatia (Germany) were analysed order to classify their hydrochemistries assist the understanding of phytoplankton colonization these extreme environments. Neither morphometric nor physical parameters influence composition but determine extent which nutrient supply supports mass development Chrysophyceae Chlorophyceae certain layers water (hypo- or epilimnetic chlorophyll maxima short developments). Conventional trophic classification is not readily applicable a chemical on basis hydrogen, total iron acidity proposed. Species Ochromonas Chlamydomonas dominate fourteen most acid lakes; dinoflagellates occurre additionally four; more diverse algal assemblage with diatoms cryptophytes found moderately 5.7–7.0) alkaline conditions 7.0–9.4). The lake chemistry main determinant for planktonic bodies whereas state mainly determines level biomass.