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Table 1

Macroalgal indicator species and non-reproducing “morphospecies”, evaluated using indicator species analysis for stream bioassessment in California, which require qualitative sampling and large amount of material for species identification. Indicator classes are defined for total dissolved phosphorus (TP low <10 μg·L-1high >100 μg·L-1), total dissolved nitrogen (TN low <0.2 mg·L-1, high >3 mg·L-1), dissolved organic carbon (DOC low <1.6 mg·L-1, high >8.3 mg·L-1), dissolved copper (Cu low <0.3 μg·L-1, high >1.7 μg·L-1) and “reference” conditions (algal taxa selected from Fetscher et al., 2014).

Taxon Indicator class
TP TN DOC Cu “Reference”

Calothrix fusca (Kütz.) Bornet and Flahault low
Calothrix parietina (Nägeli) Thuret ref.
Cladophora glomerata (L.) Kütz. high high high high non-ref.
Mougeotia calcarea (Cleve) Wittr. low
Mougeotia sp. 1 ( d : 9–15 μ m) low
Mougeotia sp. 2 ( d : 22–30 μ m) low
Mougeotia sp. 3 ( d : 18–22 μ m) low ref.
Nostoc verrucosum Vaucher ex Bornet and Flahault low low ref.
Nostochopsis lobatus H.C.Wood em. Geitler low
Oedogonium sp. 1 ( d : 35–45 μ m) high non-ref.
Oedogonium sp. 3 ( d : 10–16 μ m) non-ref.
Oedogonium sp. 5 ( d : 4–6 μ m) high
Paralemanea catenata (Kütz.) M. L.Vis and Sheath low
Rhizoclonium hieroglyphicum (C. Agardh) Kütz. high high high non-ref.
Rivularia minutula (Kütz.) Bornet et Flahault low
Sheathia involuta (Vis and Sheath) Salomaki and Vis low
Spirogyra borgeana Transeau low
Spirogyra majuscula Kütz. low
Spirogyra varians (Hassall) Kütz. low
Spirogyra weberi Kütz. low
Spirogyra sp. 1 ( d : 33–40 μ m, plane w., 1 chl.) low
Spirogyra sp. 2 ( d : 25–32 μ m, plane w., 1 chl.) low
Spirogyra sp. 4 ( d : 60–105 μ m, plane w., 5–8 chl.) high
Spirogyra sp. 12 ( d : 110–145 μ m, plane w., 5–8 chl.) high
Tolypothrix distorta Kütz. ex Bornet and Flahault low ref.
Ulothrix zonata (Weber and Mohr) Kütz. low ref.
Ulva flexuosa Wulfen high non-ref.
Zygnema sterile Transeau low
Zygnema sp. 1 ( d : 26–31 μ m) low

Abbreviations: d. – filament diameter, w. – transverse wall, chl. – chloroplast, ref. – “reference”.

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