Ecological Characteristics Of Seawater In The Vicinity Of Submarine Outfalls
Author(s)
P. Mozetic, V. Turk & K Flander Putrle
Abstract
Ecological characteristics of seawater in the
vicinity of submarine outfalls
P. Mozetic, V. Turk & V. Flander Putrle
Marine Biology Station, NIB, Piran, Slovenia
Abstract
To study the impact of sewage discharged from a mechanical treatment plant into
a shallow coastal sea (Gulf of Trieste, Adriatic Sea), two submarine outfalls were
chosen as the area for extensive research. Sampling was carried out at a station
located above the two outfalls and at a reference station during periods of
different stratification conditions of the water column. The spreading of the
sewage in the seawater was detected through observing small vertical salinity
oscillations (-0.1 PSU), and by the presence of faecal coliforms. The main
nutrient load was traced in the form of ammonium and total phosphorus.
Microscopic and HPLC analyses were used to identify the taxonomic
composition and ratios among major phytoplanktonic taxa. Both methods
indicated small changes in taxonomic composition and p
Keywords
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