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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Sep 2008, 29 (5)                                     Back


Interactions between marine facultative epiphyte Chlamydomonas sp

Water quality and zooplankton composition in a receiving pond of the stormwater runoff from an urban catchment

 

Jose de Paggi Susana*1,2, Paggi Juan1, Collins Pablo1,2 , Collins Jorge3? and? Graciela Bernal3

 

1Instituto Nacional de Limnologia (CONICET-UNL), Macia 1933, 3016 Santo Tome, Santa Fe, Argentina

2Facultad de Bioquimica y Cs. Biologicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina

3Facultad de Ingenieria en Ciencias Hidricas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina

 

(Received: December 21, 2006; Revised received: August 02, 2007; Re-revised received: August 22, 2007; Accepted: September 10, 2007)

 

Abstract: Six storm periods were monitored from November 2002 to September 2005 at two stations of a receiving pond of the stormwater runoff from a small urban catchment of the city of Santa Fe, Argentina. Weekly samples were taken before and after rain events under different conditions of temperature, pluvial precipitation, and duration of the previous dry period. A sampling station was established at the outlet of the catchment (S1) and another one near the outlet of the receiving pond (S2). Both stations differed significantly in their dissolved oxygen (DO) concentration, temperature, transparency, and zooplankton composition. The concentrations of nutrients and BOD5 values indicated permanently eutrophic condition at both stations.? After rainstorms, the concentrations of lead, zinc and suspended solids showed a marked increase. The zooplankton composition at S1 was characterized by the abundance of protozoans (Dexiostoma campylum (Stokes) Didinium nasutum Muller, Plagyopila cf nasuta, and Bdelloidea rotifers (Philodina sp and Rotaria sp), while Monogononta rotifers and small cladocerans were dominant at S2. The most abundant species were the rotifers Platyias quadricornis (Ehrenberg), Mytilina ventralis (Ehrenberg) and Lepadella ovalis (Muller), and the cladoceran Chydorus pubescens Sars.

 

Key words:??? Protozoans, Bdelloidea, Monogononta, Storm events, Water quality

PDF of full length paper is available with author (*sjdepaggi@gmail.com)

 

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