Impacts of domestic sewage effluent on phytoplankton from Bedford Basin, eastern Canada |
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| Authors: | Youlian Pan DV Subba Rao |
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| Institution: | Habitat Ecology, Marine Environmental Sciences Division, Department of Fisheries and Oceans, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia, B2Y 4A2, Canada |
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| Abstract: | The impact of domestic sewage effluent (SE) on the dynamics of phytoplankton assemblages from Bedford Basin was evaluated in the laboratory. Phytoplankton production and chlorophyll a increased proportionally with SE enrichment. Phytoplankton species composition also changed. The potentially harmful diatoms, Pseudonitzschia spp., present initially in small numbers (600 cells 1?1) in Bedford Basin seawater, and became dominant (3–5×106 cells 1?1) when the seawater was enriched with 0.5–5% untreated SE. With higher proportions of SE, other harmful species such as Fragilaria spp. and Euglena spp. became dominant (7?15×106 and 2.2×104 cells 1?1, respectively). Treatment of SE with UV light or activated charcoal seems to favour growth of benign species, such as Chaetoceros socialis, Skeletonema costatum and Thalassiosira spp., but not harmful species such as Pseudonitzschia spp. Further research on UV treatment of domestic sewage is recommended. |
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| Keywords: | sewage phytoplankton UV light charcoal Pseudo-nitzschia species succession |
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