HR: 1330h
AN: NB33D-04    [Abstracts]
TI: Chironomidae From a Sewage Treatment Station of Southern Brazil
AU: Signoretti, R P
EM: rpsig@cena.usp.br
AF: Rural Engeneering Department. "Luiz de Queiroz" Agricultural College, University of Sao Paulo, Av. Padua Dias, 11, Piracicaba, SP 13418900 Brazil
AU: * Sonoda, K C
EM: kcsonoda@esalq.usp.br
AF: Rural Engeneering Department. "Luiz de Queiroz" Agricultural College, University of Sao Paulo, Av. Padua Dias, 11, Piracicaba, SP 13418900 Brazil
AU: Ferraz, E
EM: epferraz@cena.usp.br
AF: Rural Engeneering Department. "Luiz de Queiroz" Agricultural College, University of Sao Paulo, Av. Padua Dias, 11, Piracicaba, SP 13418900 Brazil
AB: As the great number of insects living and reproducing at a municipal sewage treatment station located in Piracicaba City and the fear about how dangerous it could be for human healthy, a study was conduct to identify the taxa presented there and to analyze their community structure using stable isotopes. The Chironomidae identification was performed on specific level. The sewage treatment station is a man-made wetland system, situated 30m nearby the Piracicaba River. It treats the sewage from an urban area with 3000 inhabitants. The sewage discharge varies from 133 to 186L/s/ha. The samples were taken on the ending of the rainy season with a D-frame net. The material was washed (210mm mesh size), sorted and preserved in 70% alcohol. Chironomidae had a low participation in the community, with 14.9% of the specimens. Goeldichironomus serratus (47.8% from total Chironomidae), G. holoprasinus (43.5%) and Chironomus decorus (8.7%) were identified. Those species are worldwide recognized as pollution-resistant, used as indicators of environmental water quality. The wetland studied showed low dissolved oxygen (1.5mg/L) on the sampling period and the presence of those Chironomidae species should be expected. The low diversity and high dominance are common features for those impacted environments.
DE: 9300 INFORMATION RELATED TO GEOGRAPHIC REGION
DE: 9360 South America
DE: 9902 NABS Student Award Applied Research
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly