SciELO - Scientific Electronic Library Online

 
vol.37 issue2Consumption and digestion of animal food by rocky intertidal herbivores: an evaluation of digestive flexibility and omnivory in three grazing speciesPerformance of two sampling designs used to evaluate demersal crustaceans with the swept area method author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

CORDOVA, Salomé; GAETE, Hernán; ARANGUIZ, Fernanda  and  FIGUEROA, Ricardo. Water quality assessment in the Limache stream (central Chile), using bioindicators and bioassays. Lat. Am. J. Aquat. Res. [online]. 2009, vol.37, n.2, pp.199-209. ISSN 0718-560X.  http://dx.doi.org/10.4067/S0718-560X2009000200007.

The water quality in the Limache stream was evaluated at five sampling stations during the pe-riod of low water flow. At each station, aquatic macroinvertebrates were collected and the following parame-ters were measured in situ: pH, conductivity, dissolved oxygen, and total dissolved solids. The biological oxy-gen demand, total phosphorus, and total nitrogen were determined in the laboratory. Water toxicity was deter-mined through toxicity bioassays with the microalga Pseudokirchrneriella subcapitata. Thirty-three macroin-vertebrate families were found and the dominant taxa were Dugessidae, Oligochaeta and Chironomidae. A significant correlation was found among the Family Biotic índex ChFBI, conductivity, and total dissolved solids (r = 0.92; p < 0.05). Species diversity was lowest, as was the growth rate of P. subcapitata, at the stations with the greatest anthropogenic activity and in the discharge zone of a domestic wastewater treatment plant.

Keywords : water quality; aquatic macroinvertebrates; toxicity; Pseudokirchrneriella subcapitata; Chile.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )