2007), [beta]-mesosaprobic to polysaprobic environments (Salomoni et al.
seminulum has been noted as typical of eutrophic and polysaprobic environments (Van Dam, et al.
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.
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.
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.
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.
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.
1996), Italy (Madoni and Ghetti, 1981; Madoni, 1993; Madoni and Bassanini, 1999; Madoni, 2005; Madoni and Braghiroli, 2007) and Poland (Wiackowski, 1981), have demonstrated an increased proportion of polysaprobic and alphamesosaprobic species and a decrease in beta-metosaprobic and oligosaprobic species with increasing pollution loads caused by anthropic impacts.
The indicator species of polysaprobic environments recorded at Stations 2 and 3, located in the urban area of Sao Pedro Stream, have been reported by various authors in eutropic lakes (Finlay, 1981, 1982; Laybourn-Parry et al.