scholarly journals Hypoxia in Peter the Great Bay

2021 ◽  
Vol 201 (3) ◽  
pp. 600-639
Author(s):  
P. P. Tishchenko ◽  
V. I. Zvalinsky ◽  
T. A. Mikhaylik ◽  
P. Ya. Tishchenko
Keyword(s):  
Organic Matter ◽  
Microbial Degradation ◽  
Water Exchange ◽  
Peter The Great Bay ◽  
Warm Season ◽  
Biosphere Reserve ◽  
Japan Sea ◽  
Amur Bay ◽  
Peter The Great ◽  
Great Bay

Studies on hypoxia in Peter the Great Bay (Japan Sea) are reviewed. Seasonal hypoxia is observed in warm season at the bottom of three areas: Amur Bay, Ussuri Bay, and the southwestern part of Peter the Great Bay occupied by the Far-Eastern Marine Biosphere Reserve (FEMBR). Processes of the hypoxia forming are similar in all these areas. The main reason is the dissolved oxygen consumption by microbial degradation of organic matter within topographic depressions in conditions of limited ventilation because of strong summer stratification. The bottom depressions prevent horizontal water exchange and provide accumulation of organic and inorganic suspension, that is another factor important for development of hypoxia. The Amur Bay is the most subjected to hypoxia, being a semiclosed estuarine basin eutrophed by nutrients input from the Razdolnaya River and waste waters of Vladivostok city. The Ussuri Bay has better water exchange and less eutrophication, therefore there are scarce data about hypoxia in this area. FEMBR area has good water exchange and is only episodically influenced by nutrients discharge from the Tumen River, so hypoxia is observed there occasionally. Another consequence of microbial degradation of organic matter in these areas is acidification: pH decreased in 0.5 unit in the bottom water of the Amur Bay in eight decades from 1932 to 2013. Synchronism between regional and global processes of eutrophication, deoxygenation, and acidification of bottom waters is discussed.

scholarly journals DYNAMICS OF FAR-EASTERN DACE TRIBOLODON BRANDTII IN THE AMUR BAY (PETER THE GREAT BAY, JAPAN SEA)

2015 ◽  
Vol 16 (1) ◽  
pp. 107-117
Author(s):  
A.N. Vdovin ◽  
◽  
Yu.I. Zuenko ◽  
S.F. Solomatov ◽  
S.G. Bolshakov ◽  
...  
Keyword(s):  
Peter The Great Bay ◽  
Japan Sea ◽  
Amur Bay ◽  
Peter The Great ◽  
Great Bay ◽  
Far Eastern

scholarly journals SOME DATA ON BIOLOGY AND FISHERY OF ICEFISH SALANGICHTHYS MICRODON IN PETER THE GREAT BAY (JAPAN SEA)

2019 ◽  
Vol 196 ◽  
pp. 90-100
Author(s):  
L. N. Kim
Keyword(s):  
Body Length ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
The Body ◽  
Spawning Period ◽  
Amur Bay ◽  
Peter The Great ◽  
Great Bay ◽  
Average Body Length ◽  
Average Body

Within Peter the Great Bay, common icefish Salangichthys microdon forms commercially valuable aggregations in two areas of the Amur Bay and in one area of the Ussuri Bay. It spawns in the internal estuaries of the rivers entered to the bays and in the external estuarine zones in the tops of the bays, mostly on small pebble grounds from late April to late May and feeds in the bays waters. Data on its size and weight composition were obtained in 2017–2018 both from the Amur Bay (for spawning period) and from the Ussuri Bay (for feeding period). During the spawning (on May 6 and May 18), the body length was 59–90 mm, on average 74.9 mm, and the weight was about 750 mg; sex ratio males : females was 1.0 : 0.8. During the feeding, the average body length was 66.8 mm.

scholarly journals Current state and structure of native aggregations of pacifc oyster in the northern Amur Bay (Peter the Great Bay, Japan Sea)

2018 ◽  
Vol 195 ◽  
pp. 48-60
Author(s):  
D. A. Sokolenko ◽  
M. V. Kalinina
Keyword(s):  
Peter The Great Bay ◽  
Japan Sea ◽  
Reproductive Rate ◽  
Habitat Conditions ◽  
Amur Bay ◽  
Reproductive Ability ◽  
Peter The Great ◽  
Great Bay ◽  
Natural Reproduction ◽  
Active Processes

Spatial distribution and reproductive ability of the pacifc oysterCrassostrea gigasaggregations in the northern Amur Bay (Peter the Great Bay, Japan Sea) are investigated using the data of direct and remote accounts. Totally 772 oyster banks and reefs are detected with the summary area of 284.6 hectares that is signifcantly larger than earlier assessments. The 35 giant beds (> 1 ha) occupy 53.2 % of the summary area, but 79.8 % of mollusks gather in medium and large aggregations which occupy 45.5 % of the summary area. Majority of the aggregations (> 95 %) are located on shallows with the depth less than 5 m. The oyster matur-ing is completed when it reaches the size of 50 mm. The ratio of males to females is 1.0 : 1.5, on average, that indicates indirectly favorable habitat conditions forC. gigas. Males prevail among the small-sized individuals, but females prevail among the large-sized ones that corresponds to reproductive strategy of pacifc oyster and type of its reproduction. The males to females ratio changes from year to year. Portion of young mollusks is rather high (13.9–56.2 %), portion of the main reproductive groups changes from 40.6 to 88.9 % that indicates active processes of natural reproduction and the oyster reefs forming. Mollusks with high reproductive rate prevail among the main reproductive group with the size 70–130 mm (58.2 %). The largest number of such individuals is observed in the largest aggregations of oysters at Rechnoy Island (85.0 %) and at Skrebtsov Island (60.7 %). Spatial variations of the shells shape and ratio of size-physiological groups in the aggregations reflect patterns of the habitat conditions. Generally, the state of native oyster aggregations in the northern Amur Bay is stable with a tendency to their population increasing.

scholarly journals Patterns of nutrients distribution along salinity gradient in the estuaries of the rivers Sukhodol and Razdolnaya/Suifen (Peter the Great Bay, Japan Sea)

2015 ◽  
Vol 180 (1) ◽  
pp. 226-235
Author(s):  
Anna S. Vazhova ◽  
Yury I. Zuenko
Keyword(s):  
Organic Matter ◽  
River Water ◽  
Salinity Gradient ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
Silicon Concentration ◽  
New Production ◽  
Active Nitrogen ◽  
Peter The Great ◽  
Great Bay

Sign of production-destruction balance is determined for different parts of two rivers estuaries in Peter the Great Bay (Razdolnaya/Suifen and Sukhodol) on the data of chemical samplings in different seasons of 2010-2013. For this purpose, the nutrients concentration dependence on ratio of river and sea waters mixing is determined. In the case of conservative behavior of nutrients, their concentration should have negative linear dependence on increasing salinity, but its non-linearity shows removal or addition of the nutrients by processes of biological production or destruction: negative deviations indicate production and positive deviations indicate destruction. The concentration of mineral nitrogen is close to zero everywhere in the estuaries in spring, so below the line of conservative behavior that is the evidence of active nitrogen consumption. Patterns of silicon and phosphorus distribution are similar to the distribution of nitrogen. Summer nutrients concentrations are mainly below the conservative values, as well, with exception of the areas at the river bar, so production prevails in the external estuaries of both rivers, but remineralization prevails in the lower parts of the internal estuaries in this season. In autumn, destruction of organic matter becomes more important in both estuaries, so heightened values of nutrients are observed in all their parts, in particular in the «silicon belt» of brackish water (≈ 13-17 eps). The silicon concentration increasing at the river bar (above the concentration in the river water) is the most significant in the Razdolnaya estuary which is generally poor by this nutrient. There is concluded that terrigenous nutrients of the river water are utilized for new production mostly in the external estuaries, whereas the process of organic matter mineralization dominates in the internal estuaries. Besides of the production-destruction processes, changes of the mineral silicon concentration are determined by transformation of its inorganic forms, as dissociation of low-soluble silicates to silicon acid under heightened pH. Principal difference of the production-destruction balance between the internal and external parts of estuary could be an ecological basis for formation of different ecosystems in these zones, with principally different structure and functioning patterns.

scholarly journals BIOLOGICAL CHARACTERISTICS OF MYSID NEOMYSIS MIRABILIS IN DEPENDENCE ON ITS ENVIRONMENTS (PETER THE GREAT BAY, JAPAN SEA)

2020 ◽  
Vol 200 ◽  
pp. 101-117
Author(s):  
L. G. Sedova ◽  
L. L. Budnikova
Keyword(s):  
Peter The Great Bay ◽  
Japan Sea ◽  
Weather Conditions ◽  
The Body ◽  
Stages Of Development ◽  
Amur Bay ◽  
Sex Structure ◽  
Peter The Great ◽  
Great Bay ◽  
External Part

Size and sex structure of mysid Neomysis mirabilis in Peter the Great Bay is studied. The net samples (160 and 260 per year) were collected at the depth of 0.5–2.0 m in the southern external part of the secondary Amur Bay (at Popov and Reineke Islands) and in its northern internal part, over the total area of approximately 3 km2 , in the daytime in May-September from 2014 to 2017. The catch was recalculated per 1 m3 of water. The water temperature was measured and weather conditions were recorded. All mysids (2926 ind.) were measured under binocular microscope with accuracy of 0.1 mm, weighted by torsion scales with accuracy of 1 mg, and separated to males, females and juveniles. The females were differentiated by 5 stages of development: 1) immature females with oostegetic rudiments, 2) oviparous females, 3) females with embryos in the marsupia bags without stalk-eyed with black pigment, 4) females with embryos in marsupia bags with black eyes, 5) spawned females with empty marsupii. The females prevailed: 71.3–97.0 % in the southern Amur Bay and 39.0–56.7 % in the northern Amur Bay, while the portion of males was 2.2–28.7 % and 20.9–43.3 %, accordingly. The body length varied from 3.0 to 23.5 mm; the females and males had the same sizes, on average 14.5–15.4 mm in the southern Amur Bay and 8.3–11.2 mm in the northern Amur Bay, with slight decreasing from spring to summer. The spawning was extended in time because of several generations changing. Mysid females with eggs, their embryos at different stages of development, and juveniles of different size were presented permanently. Aggregations of N. mirabilis formed for a short time starting in middle April — middle July in the southern Amur Bay and in middle May — late July in the northern Amur Bay. The mysid biomass in the aggregations was 3–5 g/m2 and 10–500 g/m2 in these areas, respectively, that is appropriate for the commercial fishery. Spatial difference of the mysid biological parameters and abundance is explained by different environmental conditions in the internal and external areas of the Amur Bay.

scholarly journals MESOZOIC RADIOLARIANS FROM RHYTHMICALLY LAYERED SEDIMENTS OF THE RIMSKY-KORSAKOV ISLANDS (PETER THE GREAT BAY, JAPAN SEA) AND THEIR SIGNIFICANCE FOR DETERMINING THE TRIASSIC-JURASSIC BOUNDARY

2021 ◽  
pp. 39-54
Author(s):  
O.L. Smirnova ◽  
◽  
E.A. Bessonova ◽  
T.A. Emelyanova ◽  
◽  
...  
Keyword(s):  
Peter The Great Bay ◽  
Japan Sea ◽  
Research Area ◽  
Lower Jurassic ◽  
Upper Triassic ◽  
Peter The Great ◽  
Great Bay ◽  
The Pacific ◽  
Stratigraphic Division ◽  
First Time

The results of the biostratigraphic study based on the radiolarian analysis of the rhythmically layered terrigenous deposits from the Islands of the Rimsky-Korsakov Archipelago (Peter the Great Bay, Japan Sea) have been presented. These deposits are most similar to the medium-grained turbidites. For the first time the distribution and stratigraphic division of the boundary sediments of the upper Triassic and lower Jurassic separated by a marking layer were substantiated in the research area. On the basis of comparisons with isochronous zonal units of the Pacific and Tethyan areas in the upper Triassic sediments of the studied sections, layers with Globolaxtorum tozeri (upper Rhaetian) were established, and in the lower Jurassic zone Pantanellium tanuense Zone (Hettangian) was traced and layers with Parahsuum simplum (Sinemurian – Pliensbachian) were established.

scholarly journals Assessment of potential production for sea cucumber Apostichopus japonicus in a bicultural marine farm in Peter the Great Bay (Japan Sea)

2018 ◽  
Vol 195 ◽  
pp. 209-218 ◽  
Author(s):  
G. S. Gavrilova
Keyword(s):  
Organic Carbon ◽  
Sea Cucumber ◽  
Negative Impact ◽  
Apostichopus Japonicus ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
Peter The Great ◽  
Great Bay ◽  
Commercial Size ◽  
Excessive Accumulation

Marine farms in Peter the Great Bay are oriented predominantly to cultivation of bivalve mollusks that causes excessive accumulation of biodeposits in the areas of plantations. To reduce this negative impact on the ecosystem, development of bicultural farms with cultivation of flterfeeders and detritivores is recommended. In the area of mussel (Mytilus trossulus) plantations in the Sukhodol Bay, the sedimentation rate reaches 34.1 g.m–2.day–1, with mean portion of organic carbon in the biodeposits as 20.2 %. Annual biodeposition from 1 hectare of mussel plantations is about 124 t that corresponds to annual consumption of detritus by 1 million of 1-year-old sea cucumberApostichopus japonicus. By the end of the 4-year cycle of cultivation, the sea cucumbers of commercial size consume this amount of biodeposits within a month (60 g of organic carbon per year each). Production of a sea cucumber plantation with 5 million juveniles of sea cucumber settling every year can exceed 700 t in 10 years of operation, if it is mounted within the bicultural marine farm with bivalve cages as additional source of suspended organic matter.

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