Assessment of the urbanization effect on a lake by zooplankton
Authors: Pecorari, S.; José de Paggi, S.; Paggi, J.
Source: Water Resources, Volume 33, Number 6, December 2006 , pp. 677-685(9)
Publisher: MAIK Nauka/Interperiodica
Abstract:The present study was aimed at comparing zooplankton composition and abundance between the western shore of the shallow lake Setúbal, on which the city of Santa Fe is founded, and the eastern shore, whose environmental impact is scarce or null. Five samplings were carried out in 14 stations, under different seasonal conditions, hydrometric levels, and volumes of previous rainfalls. The values of conductivity, pH, transparency, specific richness, and abundance of macro and microzooplankton showed significant differences between both shores. The highest zooplankton density, with a proportion of Bdelloid rotifers of up to 20% of the total abundance, was associated with the urbanization of the impacted shore. The volume of the lake and its fast turnover rate would buffer the impact of contamination, as indicated by a certain degree of eutrophication, which is more evident at lower hydrometric levels and higher temperatures.
Document Type: Research Article
Publication date: 2006-12-01