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- Title
Salt pollution in a Japanese stream and its effects on water chemistry and epilithic algal chlorophyll-a
- Authors
Silva, E. I. L.; Shimizu, A.; Matsunami, H.
- Abstract
Concentrations of major ions, total phosphorus, dissolved organic carbon, biological oxygen demand and chlorophyll-a of epilithic algae were determined weekly at nine sites in a Japanese stream receiving effluent from a groundwater treatment plant. The concentrations of fourmajor cations (Na, K, Ca and Mg) and chloride ion increased significantly immediately at downstream sites of the effluent outfall. The ionic concentrations decreased with increasing dilution from merging tributaries but never reached the original concentrations and relative composition of stream water within a 10.7 km stream distance from theoutfall. The changes in total ionic concentration and relative ionicproportion also changed the chlorophyll-a content of epilithic algae. The results also showed significantly higher chlorophyll-a content in epilithic algae under moderate salinity.
- Subjects
GROUNDWATER pollution; WATER pollution monitoring; WATER chemistry; RIVER ecology; POLLUTION; MICROBIOLOGY; LIMNOLOGY; MARINE biology
- Publication
Hydrobiologia, 2000, Vol 437, Issue 1-3, p139
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1023/A:1026598723329