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Tan, Tjhing Lok; Rüger, Hans-Jürgen (1979): Table 1: Densities of nitrate-dissimilating and nitrite-dissimilating bacteria in surface sediments in the German Bight, North Sea. doi:10.1594/PANGAEA.743415,
Supplement to: Tan, TL; Rüger, H-J (1979): Denitrifiers in sediments of the Weser Estuary and the German Bight: Densities of nitrate-dissimilating and nitrite-dissimilating bacteria. Veröffentlichungen des Instituts für Meeresforschung Bremerhaven, 17, 189-197, hdl:10013/epic.19376.d001

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Abstract:
At 24 stations in the Weser Estuary and the German Bight the Most Probable Numbers (MPN/g dry wt. sediment) of nitrate-dissimilating (= denitrifying) and of nitrate plus nitrite-dissimilating bacteria were recorded. The numbers of nitrite-dissimilating bacteria, i. e. denitrifiers not capable of reducing nitrate to nitrite, were calculated by subtraction of the MPN for nitrate-dissimilating from the MPN of nitrate plus nitrite-dissimilating bacteria. By determining the percentages of these bacteria in relation to the number of the heterotrophs, the ecological importance of denitrification, especially the nitrite dissimilation, was estimated. The results showed the MPN of nitrate-dissimilating bacteria to be in the range of 0-156 (up to 0.8 % of heterotrophic bacteria). An exception was the sediment of one station with a MPN of 1849, or 5.2 % of the heterotrophs. The amounts of nitrite-dissimilating bacteria were between 0 and 2352 (up to 13 % of heterotrophic bacteria). In the estuary the numbers of nitrate-dissimilating and of nitrite-dissimilating bacteria showed a decreasing tendency with distance from Bremerhaven. The highest numbers were found in the Weser off Bremerhaven and also at 3 stations in the German Bight, south of the Isle of Helgoland.
Coverage:
Median Latitude: 53.742046 * Median Longitude: 8.289608 * South-bound Latitude: 53.527000 * West-bound Longitude: 7.905000 * North-bound Latitude: 54.161800 * East-bound Longitude: 8.557900
Date/Time Start: 1977-09-14T12:00:00 * Date/Time End: 1977-11-22T12:00:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
Event(s):
VH_09_77_1 (Buoy 54) * Latitude: 53.527000 * Longitude: 8.557900 * Date/Time: 1977-09-14T12:00:00 * Elevation: -8.0 m * Location: North Sea * Campaign: VH0977 * Basis: Victor Hensen * Device: van Veen Grab (VGRAB)
VH_09_77_10 (Buoy 27) * Latitude: 53.703400 * Longitude: 8.301700 * Date/Time: 1977-09-14T12:00:00 * Elevation: -15.0 m * Location: North Sea * Campaign: VH0977 * Basis: Victor Hensen * Device: van Veen Grab (VGRAB)
VH_09_77_11 (Buoy 23) * Latitude: 53.725500 * Longitude: 8.247900 * Date/Time: 1977-09-14T12:00:00 * Elevation: -15.0 m * Location: North Sea * Campaign: VH0977 * Basis: Victor Hensen * Device: van Veen Grab (VGRAB)
Comment:
The basal medium consisted of Bacto Nutrient Broth (DIFCO) with the addition of 17.6 g/l NaCl. This medium, abbreviated as NB in the parameter comment, was used to determine the Most Probable Numbers (MPN) of heterotrophic bacteria, whereas the addition of 0.5 % KN03 (NB +KN03 ) or 0.2 % KN02 (NB + KN02 ) made possible the records of nitrate-dissimilating and of nitrate plus nitrite-dissimilating bacteria, respectively. The MPN obtained with a fourth medium containing NB, 0.5 % KN03 and 0.2 % KN02 (NB + KN03 + KN02 ) were compared with the MPN from NB + KN02. The media were filled in 9 ml portions in test tubes and in each test tube a Durham tube was inserted for the detection of gas formation. The media were sterilized at 121 °C for 20 minutes in an autoclave.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelLabelTan, Tjhing Lok
3Optional event labelEvent 2
4Date/Time of eventDate/Time
5Latitude of eventLatitude
6Longitude of eventLongitude
7Elevation of eventElevationm
8DEPTH, sediment/rockDepthmGeocode
9Sediment typeSedimentTan, Tjhing Lok
10Bacteria, heterotrophicBact het#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutionsNB: turbidity
11Bacteria, nitrate-reducingBact NO3-red#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutionsNB+KNO3: nitrite
12Bacteria, nitrate-dissimilatingBact NO3-dis#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutionsNB+KNO3: gas
13Bacteria, nitrate- plus nitrite-dissimilatingBact NO3- plus NO2-dis#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutionsNB+KNO2: gas
14Bacteria, nitrate- plus nitrite-dissimilatingBact NO3- plus NO2-dis#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutionsNB+KNO3+KNO2: gas
15Bacteria, nitrite-dissimilatingBact NO2-dis#/gTan, Tjhing LokMost probable number method (MPN), based on serial dilutions
Size:
192 data points

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