Carbon, nitrogen, silicon and phosphorus nutrients in the eastern part of the Gulf of Trieste (northern Adriatic)
1983
Faganeli, J. (Univerza Edvarda Kardelja, Ljubljana (Yugoslavia). Institut za biologijo) | Tusnik, P.
This paper presents the results of investigating the presence of the nutritive salts of carbon, nitrogen, silicium and phosphorus in the Eastern part of the Gulf of Trieste (Adriatic Sea, Yugoslavia), with special emphasis on the Bays of Capodistria and Pirano and on important freshwater tributaries. The sea in the Eastern part of the Gulf of Trieste contains approximately 3 times as high concentration of the nutritive salts of N,P and Si than the Southern and middle Adriatic, i.e. approximately the same as the part of the middle Adriatic which is under the influence of the Pad river. The highest concentrations of the nutritive salts of C,N,Si and P are noticed in the surface layer of the rivers Rizana and Dragonja estuaries and especially the N and P compounds in the inner part of the Bay of Capodistria, near the inflow of utility waste waters. Higher concentrations of N,P and Si compounds, compared with the open waters of the Gulf of Trieste were noticed. The determined inverse correlation between the concentration of ammonia and nitrates and the density of phytoplankton shows that these are the most important N compounds in the phytoplankton assimilation. The concentration of the nutritive salts in influenced by:freshwater tributaries, land erosion, precipitation, regeneration processes in the sea and in sediments, excretion of organisms and inflow of the local utility waters. Owing to the high (atomic) ratio C:N:Si:P, the authors conclude that P is a limiting factor of the organic production in the Gulf of Trieste.
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