Effect of treated wastes on algal and macroinvertebrate communities in an alpine stream
AbstractThe investigation was carried out in the Warm Mandling stream (the Dachstein Alps, Austria) at eight stations (1,240-950 m a.s.l.) lying above and below the discharge of wastes from the treatment plant high concentrations of phosphates (6.3 mg PO4 dm3), total phosphorus (10.7 mg Ptot dm3), nitrates (15.8 mg N-N03 dm3), and total nitrogen (28.2 mg Ntot dm3) were assessed. The discharge of wastes brought about changes in the algal and macroinvertebrate communities. Below the treatment plant the abundance of tax of a wide ecological spectrum rose (algae -Cymbella silesiaca, Gomphonema olivaceum. Nitzschia capitellata, N. fonticola macroin-vertebrates - Leuctra spp., Orhtocaladius (E) rivicola, and larvae of the genera Cricotopus and Orthocladius), while the share of tax typical for pure streams (algae - Homoeothrox janthina, Fragilaria arcus; macroinvertrabrate - Baetis alpinus, Rhithrogena spp.) decreased.
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