. The ecology of Tijuana Estuary, California : a national estuarine research reserve. Estuarine ecology -- California Tijuana River Estuary. interactions were investigated in manipulative experiments using Milorganite (commercially available dried sewage sludge) added to microcosms containing channel macroalgae and phytoplankton (Rudnicki 1986 and Fong 1986; Section ). Nitrogen Fluxes in 1977-1978 Winfield (1980) set out to determine 1) the net direction of inorganic nitrogen movement of selected tidal cycles, 2) the relative importance of ammonium, nitrate and nitrite in channel wate
. The ecology of Tijuana Estuary, California : a national estuarine research reserve. Estuarine ecology -- California Tijuana River Estuary. interactions were investigated in manipulative experiments using Milorganite (commercially available dried sewage sludge) added to microcosms containing channel macroalgae and phytoplankton (Rudnicki 1986 and Fong 1986; Section ). Nitrogen Fluxes in 1977-1978 Winfield (1980) set out to determine 1) the net direction of inorganic nitrogen movement of selected tidal cycles, 2) the relative importance of ammonium, nitrate and nitrite in channel waters, and 3) the seasonal patterns in inorganic nitrogen flux. His field data included both flood and nonflood years, so that comparisons became possible and our ability to extrapolate to longer periods of time was improved. Concentrations of inorganic nitrogen were sampled monthly in two tidal creeks during the flood and ebb cycles of spring tides. Water samples were analyzed for ammonium, nitrate, and nitrite, using methods outlined in Strickland and Parsons (1972). One of the tidal creeks drained an area dominated by mixed cordgrass and pickleweed, and the other drained an area dominated by succulents. The two stations did not differ in nitrogen dynamics, despite their difference in vascular plant dominance. Therefore, they were averaged to calculate nitrogen fluxes. Ammonium was usually the dominant form of nitrogen. Only after the January-February 1978 flooding of Tijuana River did nitrate concentrations exceed those of ammonium. Ammonium (as atomic N) ranged from 0 to N/l (monthly means), with higher concentrations in winter and spring, and higher concentrations in flood, rather than ebb tides (Figure ). A net import was calculated for the study period. Concentrations of nitrate, averaged monthly, ranged from u,g N/l, except for the March 1978 postflood sample (25 u,g N/l). Nitrite was lower, at Lig N/l, and was usually highly correlated with nit
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