|Effects of ammonium effluents on planktonic primary production and decomposition in a coastal brackish water environment. I. Nutrient balance of the water body and effluent tests|
Tamminen, T. (1982). Effects of ammonium effluents on planktonic primary production and decomposition in a coastal brackish water environment. I. Nutrient balance of the water body and effluent tests. Neth. J. Sea Res. 16: 455-464
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
Effects of ammonium discharge on the regulation of photosynthetic production was studied from June to October 1979 in the Archipelago Sea, near the entrance of the Gulf of Finland. Sampled were the inner archipelago loaded with ammonium-rich industry effluents and some stations towards the open sea. Acute effects of effluent on natural algal and bacterial communities were tested by measurements of primary productivity and heterotrophic activity. Effluent tests were also conducted with a test alga (Chorellasp.). Nutrient ratios and AGP tests indicated that nitrogen was the principal limiting nutrient for algal growth even in the ammonium-loaded regions. Therefore, the discharge causes a considerable eutrophication in the area. Effluent concentrations from 0,01 to 1% stimulated primary productivity of natural algal communities up to 230% of the control, whereas 10% concentrations were toxic. Test algae tolerated also 10% of the effluent in some cases, and showed stimulations up to 960% of the control. No stimulation of heterotrophic activity was usually detected in effluent tests, and the threshold of toxicity was considerably lower than with algae. The effect of effluents on heterotrophic bacteria of the water body is therefore likely to be mediated through autotrophic production.