ibclogo XVI International Botanical Congess


Abstract Number: 5049
Poster No. = 1412


PERIPHYTIC COMMUNITY AS A BIOLOGICAL INDICATOR OF CUBATÃO MICROBASIN AND WASTEWATER TREATMENT STATION (FLORIANÓPOLIS, SOUTH BRAZIL


A.P. Bento and C. M. N. Panitz , Dept. of Ecology and Zoology, Federal University of Santa Catarina, Florianópolis, SC, 89049, Brazil


In water quality evaluation the periphytic community is being successfully employed. The main purpose of this study was to evaluate the water quality of river Cubatão and Pilões (Cubatão microbasin) and of the treated water. Wood artificial substrates were employed during a six month period, community development was evaluated by changes in biomass, dry weight, chlorophyl a, autotrophic and Margalef index and by the main groups. Cubatão river's biomass (gdw.m2) was bigger (10,566) than Pilões (3,421) and treated water (1,526). Ashes were the main biomass periphytic component. Chlorophyll a values show that they are still oligotrophic, showing a good water quality. The colliforms were higher (3 to 8 folds) then the allowed for potable water which can be due to the basin multiple uses. The community of both river is composed mainly by Chrysophyta, especially the filamentous one and river Pilões has more of them due to its biggest water velocity. The wastewater station is efficient because there is a total absence of any life form. The periphytic community can be considered a good water quality indicator.


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