Simulation of Organic Water Pollution using Highly Prevailing Diatom Taxa (4). Diatom assemblage in which the leading taxon belongs to Nitzschia, Pinnularia, Surirella or Synedra

Abstract

Ecological chracteristics of the diatom assemblage in which the predominating taxon belongs to Nitzschia, Pinnularia, Surirellaand Synedra are the following.
Nitzschia: Thirteen taxa belong to Nitzschia occurr ed as the predominating taxon in 391 sites (30%) among 1287 sampling sites. Almost all the taxa occur in oligosaprobic and β-mesosaprobic waters with 30-84 in DAIpo marks, however, Nitzschia palea is one of the few saprophilous taxa among them and occur frequently in polluted waters with less than 29 in DAlpo marks.
Pinnularia: Pinnularia brauniivar. amphicephala is generally known as an acido biontict axon, moreover, this is a typical saprophilous taxon.
Surirella: Two taxa belong to Surirella occurred as the predominating taxon in slightly polluted flowing sites with 30-51 in DAIpo marks.
Synedra: The diatom assemblage in which the predominating taxon belongs to Synedra has a tendency of occurring in clean waters. Among the seven taxa appeared as the predominating taxon, Synedra inaequalis and S. ulna var. ulna occurred in xenosaprobic and β-mesosaprobic flowing waters respectively, S. acus, S. delicatissima var. deticatissima, S. rumpens var. familiaris, S. rumpens var. fragilarioides and S. amphicephala in oligosaprobic standing waters.