scholarly journals Peculiarities of temporal variability of dissolved oxygen content in eelgrass Zostera marina Linnaeus, 1753 meadows in the Voevoda Bay (the Amur Bay, the Sea of Japan)

2021 ◽  
Vol 6 (1) ◽  
pp. 3-16
Author(s):  
Yu. A. Barabanshchikov ◽  
P. Ya. Tishchenko ◽  
P. Yu. Semkin ◽  
V. I. Zvalinsky ◽  
T. A. Mikhailik ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Oxygen Concentration ◽  
Sea Of Japan ◽  
Zostera Marina ◽  
Oxygen Sensor ◽  
The Sea Of Japan ◽  
Amur Bay ◽  
Short Period ◽  
Daily Variability

Currently, the shallow basins with Zostera marina L. meadows are considered as absorbers of atmospheric carbon dioxide, capable of restraining an increase in its concentration. Due to its high primary productivity, eelgrass releases a large amount of oxygen into the environment. To establish the peculiarities of production activity in shallow-water basins, covered with Z. marina meadows, we conducted monitoring of hydrological and production indicators with different measurement intervals on the example of the Voevoda Bay (the Amur Bay, the Sea of Japan). Observations were carried out for eight and a half months (22.09.2012–07.06.2013). Measurements of temperature, salinity, chlorophyll fluorescence, and turbidity were carried out in Z. marina meadows at a depth of 4 m every three hours by a Water Quality Monitor hydrological station. Dissolved oxygen content was determined every hour by an optical oxygen sensor ARO-USB. Two types of oxygen concentration variability were established: 1) seasonal variability, mostly resulting from seasonal variations in the environment; 2) daily variability during the freeze-up period, mostly determined by the intensity of photosynthetically active radiation penetration into sub-ice water. In the autumn season, low oxygen concentrations, up to hypoxic level, were recorded. In the winter and spring seasons, the oxygen content was, as a rule, at 100–130 % of saturation. High daily variability was observed during the freeze-up period, with no snow coverage. In February, the range of daily fluctuations of oxygen concentration reached 730 μmol·kg−1, with 3-fold supersaturation regarding atmospheric O2. As established, the maximum rate of oxygen production, relative to 1 g of Z. marina wet weight, is 6.5 mg O2·h−1·g−1. High daily dynamics of oxygen in seawater is analyzed in relation to eelgrass physiological peculiarities (air lacunae play an important role in oxygen dynamics in the environment), as well as to short-period tides. .

Analysis of the Ecotoxicological Conditions of Amur Bay, the Sea of Japan, by Chemical and Toxicological Characteristics

2019 ◽  
Vol 46 (3) ◽  
pp. 432-442
Author(s):  
S. A. Cherkashin ◽  
M. V. Simokon’ ◽  
T. S. Pryazhevskaya
Keyword(s):  
Sea Of Japan ◽  
The Sea Of Japan ◽  
Amur Bay

scholarly journals Probabilistic Characteristics of Intensive Short-Period Internal Waves in the Sea of Japan

2020 ◽  
Vol 27 (5) ◽  
Author(s):  
M. V. Kokoulina ◽  
O. E. Kurkina ◽  
E. A. Rouvinskaya ◽  
A. A. Kurkin ◽  
◽  
...  
Keyword(s):  
Internal Waves ◽  
Sea Of Japan ◽  
Peter The Great Bay ◽  
Statistical Characteristics ◽  
The Sea Of Japan ◽  
Peter The Great ◽  
Short Period ◽  
Wave Heights ◽  
Log Normal ◽  
Log Normal Distribution

Purpose. The paper is aimed at studying the regional features of the internal waves’ field in the Sea of Japan (the Peter the Great Bay) based on the field data, namely, determination of the internal waves’ statistical characteristics that can be used to predict possibility of generating the waves of extreme amplitudes. Methods and Results. The records of water temperature variability in the Peter the Great Bay (the depth at the point of measurements is 42 m) obtained for October 11 – 20, 2011 were used as the initial data. Sampling frequency of the records was 1 s that permitted to analyze the shape of the short-period internal waves. The data on the salinity vertical distribution near the measurement point was also used. The law of the power density spectrum decay (as applied to the studied record) is well described by the Garrett – Munk model for the Sea of Japan zone being under consideration. The calculated temporal series of density were applied for obtaining the basic statistical characteristics including the statistical moments. Besides, empirical distribution for such parameters as the wave heights, periods and steepness and the wave slope amplitude was approximated by the log-normal distribution law and analyzed. The expected wave heights were forecasted using the Poisson statistics. Conclusions. It is shown that the probabilistic characteristics of the internal waves are described well by the log-normal distribution. Based on repeatability of the internal waves’ heights, probability of appearance of intensive disturbances is estimated. It is shown that within 10 days, occurrence of a short-period wave with the height not less than 7 m is guaranteed at the observation point at the 42 m depth. Keywords intensive internal waves, in situ data, probabilistic characteristics of extreme waves, shelf, Sea of Japan.

Phytoplankton of Amur Bay in the Sea of Japan near Vladivostok

2003 ◽  
Vol 5 (2) ◽  
pp. 82-95 ◽  
Author(s):  
A. A. Begun ◽  
T. Yu. Orlova ◽  
A. Yu. Zvyagintsev
Keyword(s):  
Sea Of Japan ◽  
The Sea Of Japan ◽  
Amur Bay

Design of Water Dissolved Oxygen Test System

2011 ◽  
Vol 467-469 ◽  
pp. 1189-1192
Author(s):  
Ju Xiang Wang ◽  
Xiao Wang ◽  
Xin Wu
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Oxygen Sensor ◽  
Sequential Sampling ◽  
Test System ◽  
Economic Losses ◽  
Fish Feed ◽  
Feed Conversion ◽  
Low Oxygen ◽  
Oxygen Determination

The amount of the dissolved oxygen in the water is an important index for the fishery breeding. This design is intended to avoid the negligence in fishery breeding because farmers failed to increase the oxygen to the pond, which led to the death of fish, also discussed the influence of algae water pollution, temperature and water depth on the determination. The design using acidic gel electrolyte original battery coated in oxygen sensors as oxygen sensor，AT89S52 SCM system as the oxygen determination and control system, SCM control relay to control the opened and closed of aerator. To improve the accuracy of oxygen collection, this design uses three oxygen sensor at different positions turns sequential sampling in the pond, by the A/D converter into SCM and corresponding control signal. If the average value of oxygen content in the pool below the lowest oxygen resistance of fish aerator would be opened, to ensure the lowest oxygen content so that fish will avoid death. Avoid the economic losses caused by the fish death as farmers fail to open aerator timely, that because of the low oxygen content cause by the sudden changes of light, temperature, pressure and so on. At the same time the design will always show the oxygen content at all times, so that oxygen contents can be adjusted according to the numerical value in the pond, to achieve optimal oxygen content and improve the standard of fish feed conversion rate and growth rate.

Biology and Management of Inland Striped Bass and Hybrid Striped Bass

2013 ◽  
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Oxygen Concentration ◽  
Fisheries Management ◽  
Striped Bass ◽  
Oxygen Depletion ◽  
Alosa Pseudoharengus ◽  
Reservoir Fisheries

<em>Abstract</em>.—Historically, striped bass <em>Morone saxatilis</em> summer kills have been attributed to two mechanisms: stressors associated with crowding when striped bass are confined in isolated, cool refuges; and thermal stress or energetic deficit when hypolimnetic hypoxia (dissolved oxygen less than 2 mg/L) forces them into high-temperature surface waters. Here, we present observations suggesting that a third mechanism may account for some of these striped bass mortality events. During summer stratification, many relatively deep southeastern reservoirs develop hypoxia in the metalimnion, as well as near the bottom, isolating a layer of oxygenated hypolimnetic water between them. As these hypoxic zones expand in thickness and severity of oxygen depletion, the oxygenated layer between them shrinks both horizontally and vertically, and its oxygen content declines. Evidence suggests that striped bass summer kills can occur when fish are trapped in this isolated layer and its oxygen concentration declines below 2 mg/L or disappears altogether. The presence of coolwater forage fish such as alewife <em>Alosa pseudoharengus </em>or blueback herring <em>A. aestivalis </em>may increase the risk of striped bass kills by attracting them into the hypolimnetic oxygenated layer where they may become trapped. We draw upon examples from two southeastern reservoirs to illustrate this phenomenon, and discuss its implications for reservoir fisheries management, as well as possible approaches to minimize or avoid impacts.

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