Man-made eutrophication in a newfoundland (Canada) harbour

✍ Scribed by Mrs. Maxine F. Frecker; Dr. Charles C. Davis

• Publisher: John Wiley and Sons
• Year: 1975
• Tongue: English
• Weight: 760 KB
• Volume: 60
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19750600307

✦ Synopsis

Abstract

A comparative study in 1969‐1970 of the phytoplankton and certain other parameters in St. John's Harbour and Aquaforte Harbour, located on the southeast coast of Newfoundland, led to the conclusion that St. John's Harbour which receives untreated sewage as a prime source of nutrients was by far the more eutrophic. Evidence for the eutrophic state was especially observed in the central basin (Station 1) of the harbour. Here the bottom waters were deficient in oxygen especially during the summer months. Secchi disc readings were generally lower at this station, and the annual standing crop of phytoplankton was almost three times that at unpolluted Aquaforte Harbour. Also the proportion of the biomass contributed by the nannoplankton was greater in St. John's Harbour. One euglenoid occurred in bloom concentrations throughout the summer months and may possibly be considered as an indicator of organically‐polluted waters.