Carbon nad nitrogen stable isotope ratios of particulate organic matter (POM) as well as other pertinent parametres were studied in the Gulf of Trieste (northern Adriatic Sea) in order to track the temporal variations and differences. The significant correlation between del15NPN values and nitrate concentrations implies intense nitrate assimilation in the "new primary production". A low fractionation factor was probably a consequence of distinct phytoplankton species, i.e nanoflagellates, and specific growth conditions present in the Gulf of Trieste.
COBISS.SI-ID: 22579239
A complete depletion of dissolved O2 and nitrate were observed after 6-15 days in marine and lagoonal sediments, and after 5 days in brackish sediments of the Gulf of Trieste. NH4 and PO4 regeneration was much more extensive in sediments overlain by O2-depleted waters. During reoxydation, an influx of PO4 removed soluble P by precipitation. We distinguished: OM degraded under oxic conditions in marine and brackish sediments vs. rapidly degraded OM under anoxic conditions in lagoonary sediments.
COBISS.SI-ID: 2028111