- ** Vorticella convallaria-complex - a Vorticella campanula - b Vorticella (morphospecies 1-4) - ** D = appeared in the same day of assay; 1st = appeared in the first week of assay; 2nd = in the second week; 3rd = in the third week; 4th = in the fourth; S = saprobicity (Foissner & Berger, 1996); p = polysaprobic
; a = alpha-mesosaprobic; b = beta-mesosaprobic; **=not classified; + = occurred; -- = absent.
terebriformis C.Agardh ex Gomont 2,9 1892 S: Indicators of pollution; X: xenosaprobic; O: oligosaprobic; [beta]: beta-mesosaprobe; [alpha]: alpha-mesosaprobic; p: polysaprobic
; G: Indication strength; S: Saprobic index.
The lower taxonomic richness recorded at the Banado Carilauquen can be attributed to the critical conditions of this perturbed inland lake including hard, eutrophic, polysaprobic and contaminated waters, together with pronounced variability in water permanence and high impact of human activities.
Actually, faunal composition at the headwaters and higher reaches of the Banado Carilauquen is dominated by taxa with relatively narrow tolerance ranges, whereas the few taxa present all year round in both communities at the outlet, such as Chironomus sp., are broadly tolerant of critical water conditions, including very hard and polysaprobic water (Paggi, 1999; Mandaville, 2002).
Macroinvertebrate settlement at all sites is dominated by those Diptera larvae and Tubificidae which do not demand a high water quality; their high abundances indicate a polysaprobic
Zone--That area of a grossly polluted stream that contains the complex organic waste matter that is decomposing primarily by anaerobic processes.
palea, which was common in May and November 2008, is commonly cited as an indicator of eutrophic conditions (Lange-Bertalot, 1979; Gomez and Licursi, 2001; Lobo et al., 2004a,b,c; Salomoni et al., 2006; Potapova and Charles, 2007; Stenger-Kovacs et al., 2007), [beta]-mesosaprobic to polysaprobic environments (Salomoni et al., 2011), and polysaprobic environments (Descy, 1979), and is often reported to occur in water with low concentrations of dissolved oxygen (Van Dam, et al., 1994; Hofmann, 1994; Duong et al., 2006).
seminulum has been noted as typical of eutrophic and polysaprobic environments (Van Dam, et al., 1994; Hofmann, 1994; Potapova and Charles, 2007).
Lange-Bertalot (1979) mentioned it as one of various species that are tolerant of [alpha]-mesosaprobic conditions, but which do not thrive in polysaprobic conditions.
Finally, the species characteristic of Group A were assigned the empirical saprobic value "s" = 4 and indicative value "vi" = 5, for polysaprobic
levels and high tolerance to eutrophication, respectively.
and Spirostomum teres Clapere et Lachmann, 1958 are indicators of polysaprobic environments; Euplotes eurystomus Wrzesmiowski, 1870, Podophrya fixa, Stentor coeruleus and Tokophrya lenarum of alfa-mesosaprobic environments; Coleps sp., Spirostomum minus and Stentor polymorphus Ehrenberg, 1830 of alpha-mesosaprobic to beta-mesosaprobic environments; Frontonia leucas, Urocentrum turbo and Stylonychia pustulata of beta-mesosaprobic environments; and Halteria sp., which indicates oligosaprobic to alpha-mesosaprobic environments (Table 1).
Figure 8 shows the presence of indicator species of alpha-mesosaprobic and polysaprobic environments at Stations 2 and 3 and the occurrence of an indicator species of an oligosaprobic environment only at Station 1.