Use of nitrifying activity measurements for describing the effect of salinity on nitrification in the Scheldt estuary.
نویسنده
چکیده
Nitrifying activity measurements, carried out on freshly collected samples from an estuarine environment, show that the composition of the nitrifier population undergoes a progressive modification during the mixing of freshwater masses in seawater, with increasing tolerance to salt. As a result, the overall effect of increasing salinity on nitrification is much less severe than the direct effect of salt on the freshwater nitrifying population.
منابع مشابه
2 Comparison of nitrifier activity versus growth in the Scheldt estuary - a turbid, tidal estuary in northern Europe
Nitrification, the microbial oxidation of ammonium (NH4 ), is one of the key nitrogen transformation processes. It is performed under oxic conditions by 2 groups of bacteria, one group that oxidizes ammonium to nitrite (NO2 ) and a second group that further oxidizes nitrite to nitrate (NO − 3 ). Nitrification links organic matter mineralization (ammonification) and nitrogen removal through deni...
متن کاملDistribution of Nitrifying Activity in the Seine River (France) from Paris to the Estuary
T he distribution o f nitrification has been m easured with the 111 '( ( ) ; incorporation m ethod in the Seine River and its estuary during sum m er conditions. T he Seine River below Paris receives large am ounts o f am m onium through w astewater discharge. In the river itself, this am m onium is only slowly nitrified, while in the estuary nitrification is rap id and com plete. We show that ...
متن کاملPlanktonic and Whole System Metabolism in a Nutrient-rich Estuary (the Scheldt Estuary)
Planktonic gross primary production (GPP), community respiration (CR), and nitrification (NIT) were measured monthly in the Scheldt estuary by the oxygen incubation method in 2003. No significant evolution of planktonic GPP was observed since the 1990s with high rates in the freshwater area (salinity 0; 97 6 65 mmol C m d) decreasing seaward (22–37 mmol C m d). A significant decrease of NIT was...
متن کاملDirect and Indirect pCO2 Measurements in a Wide Range of pCO2 and Salinity Values (The Scheldt Estuary)
Recent improvements in both Infra-red spectroscopy and equilibrator techniques have allowed to determine, for the first time, pCO2 using simultaneously and continuously both the direct and indirect methods in an estuary where pCO2 values range from 500 to 8500 μatm and salinity from 0 to 30. Our results show that both methods are in excellent agreement in the whole estuary (r2 = 0.999, n = 1075...
متن کاملEstimates of denitrification and nitrification in coastal and estuarine sediments.
Denitrification and nitrification in sediments of Tama Estuary and Odawa Bay, Japan, were investigated by the combined use of a continuous-flow sediment-water system and a N tracer technique. At Odawa Bay, the nitrification rate was comparable to the nitrate reduction rate, and 70% of the N(2) evolved originated from nitrogenous oxides (nitrate and nitrite) which were produced by the action of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Applied and environmental microbiology
دوره 47 2 شماره
صفحات -
تاریخ انتشار 1984