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Growth responses of periphyton and chironomids exposed to biologically treated bleached‐kraft pulp mill effluent
Author(s) -
Dubé Monique G.,
Culp Joseph M.
Publication year - 1996
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620151120
Subject(s) - periphyton , effluent , paper mill , environmental chemistry , benthic zone , pulp (tooth) , chironomidae , kraft process , chemistry , biomass (ecology) , kraft paper , environmental science , pulp and paper industry , ecology , biology , environmental engineering , medicine , pathology , larva , engineering
Experiments were conducted in artificial streams to determine the effects of increasing concentrations of bleached‐kraft pulp mill effluent (BKME) on periphyton and chironomid (Chironomidae) growth in the Thompson River, British Columbia, Canada. Periphyton growth, as determined by increases in chlorophyll a , was significantly stimulated at all effluent concentrations tested (0.25, 0.5, 1.0, 5.0, and 10.0%). Chironomid growth (total biomass and individual weight) was also significantly stimulated at low effluent concentrations (≤1.0%). At higher concentrations (5.0 and 10.0%), chironomid growth was inhibited relative to the 1.0% treatment streams but was greater than in the controls. Increases in growth were attributed to the effects of nutrient and organic enrichment from BKME. The effluent contained high concentrations of phosphorus and appears to be an important source of carbon for benthic insects grazing on the biofilm. In high‐concentration effluent streams, chironomid growth decreased despite low levels of typical pulp mill contaminants (chlorinated phenolics, resin acids, and adsorbable organic halide). This suggests that other compounds in the effluent, such as wood extractives, may be inhibiting chironomid growth. These results support findings of field monitoring studies conducted in the Thompson River, in which changes in periphyton and chironomid abundance occurred downstream of a bleached‐kraft pulp mill.