scholarly journals Seasonal dynamics in fish and squid trophic status in the pelagic Sea of Okhotsk, based on d13C and d15N stable isotope data analysis

Trudy VNIRO ◽  
2020 ◽  
Vol 181 ◽  
pp. 52-68
Author(s):  
K.M. Gorbatenko ◽  
◽  
I.V. Melnikov ◽  
S.I. Kiyashko ◽  
◽  
...  
Keyword(s):  
Stable Isotope ◽  
Sea Of Okhotsk ◽  
Trophic Status ◽  
Juvenile Fish ◽  
Trophic Levels ◽  
Growing Up ◽  
The Sea Of Okhotsk ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Matter Transfer

Seasonal trophic dynamics was analyzed based on d13C and d15N stable isotope mass content in the Sea of Okhotsk 35 nekton species (fish and squid (Teuthida)). It was shown that considerable differences between species in stable isotope mass contents were associated with diet type. The d15N average values of the Sea of Okhotsk species were 4.5 ‰ in spring, 7.5 ‰ in summer, and 5.4 ‰ in autumn. The summer increase was caused by the appearance of juvenile fish and squid with low trophic status and minimal d15N values, and the autumn decline was due increased trophic status of growing up young individuals. Variability range in d15N values was 11.5 ‰ for all nekton species in summer including migrants into the Sea of Okhotsk from the Pacific Ocean. Relatively narrow variability range in d13C for nekton species, of 2.2–3.3 ‰, reflects seasonal homogeneity in the trophic web basement in the pelagic Sea of Okhotsk. The structure of the food web of the pelagic nekton, presented according to the d15N and d13C data, provides useful information on the pathways of organic matter transfer to the pelagic zone at the upper trophic levels and can be further used to construct trophodynamic models of the Sea of Okhotsk.

Atmospheric mercury (Hg(0)) concentrations and Hg(0) fluxes in the Sea of Japan and the Okhotsk Sea in fall 2019

2020 ◽  
Author(s):  
Evgeny Lopatnikov ◽  
Viktor Kalinchuk ◽  
Anatoly Astakhov ◽  
Yang Gang ◽  
Jianjun Zou
Keyword(s):  
Sea Of Japan ◽  
Yellow Sea ◽  
Sea Of Okhotsk ◽  
The Yellow Sea ◽  
The Sea Of Japan ◽  
Air Masses ◽  
The Sea Of Okhotsk ◽  
Kurile Islands ◽  
The Pacific ◽  
The Pacific Ocean

<p>Continuous measurements of gaseous elemental mercury (Hg(0)) in the marine boundary layer (MBL) and Hg(0) fluxes were conducted in the Sea of Japan and the Sea of Okhotsk from September 7 to October 17, 2019. All Hg(0) measurements were carried out using two RA-915M mercury analysers (Lumex LLC, Russia). Hg(0) concentrations in the air were measured at two levels (about 2 m and 20 m above the sea surface) with a time resolution of 30 minutes. Hg(0) fluxes were measured at five sample stations using a dynamic flux chamber.</p><p>During the cruise Hg(0) concentrations varied in the range from 0,47 ng/m<sup>3</sup> to 1,55 ng/m<sup>3</sup>, and from 0,31 ng/m<sup>3</sup> to 2,71 ng/m<sup>3</sup> with medians of 0,92 ng/m<sup>3</sup> for 2 m and 20 m, respectively. Atmospheric Hg(0) concentrations in measurements sites were strongly depended on the regions from where air masses came to the study areas. As a result of the Concentration Weighted Trajectory (CWT) analysis we established 2 regions that influenced the Hg(0) concentrations during the cruise: the Northeast China with the Yellow Sea region and the Kurile Islands sector of the Pacific Ocean. The arrival of air masses from China and the Yellow Sea region caused an increase in Hg(0) concentrations in the air in the Sea of Japan and the Sea of Okhotsk. Elevated concentrations were also observed In the Sea of Okhotsk during the periods air masses came from the Kurile Islands sector of the Pacific Ocean.</p><p>Hg(0) fluxes were measured at 3 stations in the Sea of Japan and at 2 stations in the Sea of Okhotsk. The values ranged from 0,57 ng/m<sup>2</sup>/h to 1,55 ng/m<sup>2</sup>/h, with median value of 1,32 ng/m<sup>2</sup>/h. A positive relationships between Hg(0) flux and air and water temperature were observed.</p><p>This work was supported by the Russian Science Foundation (RSF) (Project № 19-77-10011) and by the National Natural Science Foundation of China (Projects №: 41876065, 41420104005, U1606401) and National Program on Global Change and Air-Sea Interaction (Project № GASI-GEOGE-04).</p>

The Prehistory of Kamchatka

1947 ◽  
Vol 12 (3Part1) ◽  
pp. 173-179
Author(s):  
George I. Quimby
Keyword(s):  
Pacific Ocean ◽  
Bering Sea ◽  
Sea Of Okhotsk ◽  
Alpine Vegetation ◽  
The West ◽  
The Sea Of Okhotsk ◽  
The Pacific ◽  
The Pacific Ocean

The peninsula of Kamchatka in Siberia is situated between the Sea of Okhotsk on the west and Bering Sea and the Pacific Ocean on on the east. This peninsula is about 750 miles long and 80 to 300 miles wide with a mountainous and volcanic interior and a somewhat severe climate. Forests cover all the land except where there are areas of tundra or alpine vegetation.

Biogeochemical and physical processes in the Sea of Okhotsk and the linkage to the Pacific Ocean

2014 ◽  
Vol 126 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Nishioka ◽  
Humio Mitsudera ◽  
Ichiro Yasuda ◽  
Hongbin Liu ◽  
Takeshi Nakatsuka ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Sea Of Okhotsk ◽  
Physical Processes ◽  
The Sea Of Okhotsk ◽  
The Pacific ◽  
The Pacific Ocean

Little-known arctic species Montacuta spitzbergensis (Bivalvia: Montacutidae) from the north-western Pacific with notes on Montacuta substriata and Tellimya ferruginosa

2008 ◽  
Vol 88 (2) ◽  
pp. 347-356 ◽  
Author(s):  
Gennady M. Kamenev
Keyword(s):  
Sea Of Okhotsk ◽  
First Record ◽  
Western Pacific ◽  
The Arctic ◽  
Arctic Species ◽  
The North ◽  
The Pacific ◽  
The Pacific Ocean ◽  
North Western ◽  
North Western Pacific

An expanded description of a little-known arctic species Montacuta spitzbergensis from the Sea of Okhotsk with new data on its morphology, ecology and geographical distribution is given. This is the first record of M. spitzbergensis from the north-western Pacific. It differs from other species of Montacuta in its large (to 8.4 mm), elongate–ovate, thick shell with wide, slightly curved hinge plate, wide, short, and shallow resilifer, and weakly developed external ligament. This species occurs in the Arctic Ocean (Spitsbergen, Barents, Kara, Laptev and Chukchi Seas) and the Pacific Ocean (Sea of Okhotsk) at depths from 9 to 232 m at a bottom temperature from −1.62°C to +2.50°C. The hinge structure of the type species of the genera Montacuta and Tellimya is also discussed.

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