Algae as Bioindicators - Freshwater Algae: Identification, Enumeration and Use as Bioindicators - page 126

Ta b l e 3 . 9 Comparison of the Diatom Floras Monitored by Lange-Bertalot, Watanabe and Round
for Severely Polluted and Moderately Polluted River Sites.

Lange-Bertalot Watanabe Round

Severe nutrient pollution: most tolerant diatom species

Group 1 Saprophilic a Zone 5

Amphora veneta Navicula goeppertiana Amphora veneta

Gomphonema parvulum Achnanthes minutissima Gomphonema augur

Navicula accomoda var saprophila Navicula accomoda

Navicula atomus Navicula minima Small Navicula

Navicula goeppertiana Navicula mutica Small Nitzschia

Navicula saprophila Navicula seminula

Navicula seminulum Nitzschia palea

Nitzschia communis
Nitzschia palea
Synedra ulna
Navicula minima
Navicula frugalis
Navicula permitis
Navicula twymaniana
Navicla umbonata
Navicula thermalis
Moderate nutrient pollution: Less-tolerant diatom species

Group IIa Eurysaprobic a Zone 4

Achnanthes lanceolata Achnanthes lanceolata Amphora pediculus

Cymbella ventricosa Cocconeis placentula Reimeria sinuata

Diatoma elongatum Gomphonema parvulum = Cymbella sinuata

Fragilaria vaucheriae Navicula atomus Gomphonema sp.

Fragilaria parvulum Nitzschia frustulum

Navicula avenacea
Navicula gregaria
Navicula halophila
Nitzschia amphibian
Surirella ovalis
Synedra pulchella

Source : Adapted from Round, 1993.
a Saprophilic (preference for high soluble organic nutrient levels), Eurysaprobic (tolerant of a range of soluble
organic nutrient levels). Species present in two or more of the lists area shown in bold.

alsobetakenintoaccount.Theimpactoflocalhydrol-
ogy was shown by the presence of planktonic diatoms
in benthic samples where rivers are connecting lakes
(Group D) or have numerous ponds and lakes within
the watercourses (Group J).

3.4.4 Human impacts and diatom indices

Diatom indices have been widely used in assess-
ing water quality and in monitoring human impacts
on freshwater systems. The latter can be considered