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Figure 8: Relative abundance of diatoms in trophic tolerance groups (Hofmann, 1994) basing on the
Vollenweider model (1979) (TP = total phosphorus concentration, DAZ = local diatom assemblage zones) -
Lama Lake PO IIII (NE Norilsk , W Siberia).
the maximum abundance in the sequence. The co-occurring Aulacoseira subarctica and
Fragilaria construens vaL venter are both known as opportunistic taxa. The tychoplanktonic