Citation:

S0001437007050104

Name: Contents of labile sulfides in the upper layer bottom sediments and parameters of zoobethos density and composition in the central part of the Sea of Azov
Published: 2007
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

At 17 stations in the central part of the Sea of Azov contents of labile (acid-soluble) sulfides were determined in the upper layer (0-3 cm) of bottom sediments. At 14 of these stations contents of sulfides exceeded 300 mg S/l of wet sediment; at seven stations contents of sulfides varied from 420 to 720 mg S/l of wet sediment, or 0.1-0.2% of dry weight. At other three stations, where neutral matter such as shells and sand prevailed in samples, contents of sulfides varied from 80 to 110 mg S/l of wet sediment. At these stations high density and species diversity of benthic fauna was retained. At other stations with labile sulfide contents over 200-300 mg S/l benthos biomass decreased by one or two orders of magnitude. At most of them it was less than 3 g/m**2 and small gastropod Hydrobia tolerant to sulfides dominated. Obtained data show that in the central part of the Sea of Azov reduced sediments with high contents of labile sulfides migrate towards the bottom surface, which conforms to high intensity of hydrogen sulfide formation process caused by bacterial sulfate reduction. The study considers environmental effects of sulfide contamination in the upper layer of bottom sediments in the Sea of Azov as a key factor causing recurrent hypoxy in the near-bottom layers of water, suffocation occurrence, and progressive depletion of benthic and pelagic fauna.

Project(s):

Archive of Ocean Data (ARCOD)

Coverage:

Median Latitude: 46.231000 * Median Longitude: 37.084000 * South-bound Latitude: 46.048000 * West-bound Longitude: 36.850000 * North-bound Latitude: 46.406000 * East-bound Longitude: 37.519000

Minimum DEPTH, sediment/rock: 0.015 m * Maximum DEPTH, sediment/rock: 0.015 m

Event(s):

SoA-03-9 * Latitude: 46.220000 * Longitude: 36.850000 * Elevation: -12.6 m * Location: Sea of Azov * Method/Device: Grab (GRAB)

SoA-03-15 * Latitude: 46.224000 * Longitude: 36.876000 * Elevation: -12.6 m * Location: Sea of Azov * Method/Device: Grab (GRAB)

SoA-03-21 * Latitude: 46.225000 * Longitude: 36.903000 * Elevation: -12.7 m * Location: Sea of Azov * Method/Device: Grab (GRAB)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	DEPTH, sediment/rock	Depth sed	m			Geocode
6	Depth, top/min	Depth top	m	Sorokin, Yury I
7	Depth, bottom/max	Depth bot	m	Sorokin, Yury I
8	Sediment type	Sediment		Sorokin, Yury I
9	Sulfur in sulfide	S in S2-	mg/l	Sorokin, Yury I	Iodometric chemical method	of wet sediment
10	Sulfur bound in sulfide	S (S2-)	%	Sorokin, Yury I	Iodometric chemical method	of dry weight
11	Zoobenthos, biomass	Zoobenthos biom	mg/m²	Sorokin, Yury I	Benthic biomass, wet weight
12	Species	Species		Sorokin, Yury I		dominant
13	Percentage	Perc	%	Sorokin, Yury I	Calculated	dominant species of total biomass

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

128 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Depth sed [m]	7 Depth bot [m]	8 Sediment	9 S in S2- [mg/l]	10 S (S2-) [%]	11 Zoobenthos biom [mg/m²]	12 Species	13 Perc [%]
SoA-03-96	46.048	37.138	-10.5	0.015	0.03	silt, dark gray to black, H2S odor	81	0.017	195900	Mytelaster linearis	93
SoA-03-87	46.316	37.129	-12.6	0.015	0.03	silt, gray, shells up to 30%	220	0.063	1200	Hydrobia acuta	100
SoA-03-86	46.406	37.131	-12.5	0.015	0.03	silt, gray	420	0.114	2900	Hydrobia acuta	66
SoA-03-9	46.220	36.850	-12.6	0.015	0.03	silt	340	0.105	7900	Hydrobia acuta	100
SoA-03-131	46.229	37.519	-7.1	0.015	0.03	silt, greenish gray	110	0.023	264400	Mytelaster linearis, Cerastoderma lamarckii, Balanus improvisus	93
SoA-03-119	46.225	37.266	-10.2	0.015	0.03	silty sand, shells up to 30%	110	0.015	379500	Mytilus galloprovincialis	83
SoA-03-15	46.224	36.876	-12.6	0.015	0.03	silt, light greenish gray	375	0.111	2200	Hydrobia acuta	97
SoA-03-21	46.225	36.903	-12.7	0.015	0.03	silt, light greenish gray	176	0.088	800	Hydrobia acuta	100
SoA-03-28	46.222	36.943	-12.9	0.015	0.03	silt	497	0.127	2000	Hydrobia acuta	64
SoA-03-36	46.225	36.973	-13.2	0.015	0.03	silt, light greenish gray	330	0.085	1600	Hydrobia acuta	100
SoA-03-50	46.225	37.006	-13.4	0.015	0.03	silt, light greenish gray	430	0.132	600	Hydrobia acuta	100
SoA-03-60	46.226	37.038	-13.2	0.015	0.03	silt, light greenish gray	690	0.212	1800	Hydrobia acuta	100
SoA-03-67	46.226	37.070	-13.2	0.015	0.03	silt, light greenish gray	348	0.099	3400	Hydrobia acuta	100
SoA-03-89	46.227	37.132	-13.9	0.015	0.03	silt, light greenish gray	450	0.138	10400	Hydrobia acuta	100
SoA-03-99	46.226	37.168	-12.6	0.015	0.03	silt, light greenish gray, shells, H2S odor	435	0.090	14000	Mytelaster linearis, Hydrobia acuta	94
SoA-03-106	46.226	37.202	-12.1	0.015	0.03	silt, light greenish gray, shells, H2S odor	536	0.129	3200	Hydrobia acuta	100