Pub Date : 2024-08-26DOI: 10.1134/s000143702470022x
S. V. Bakanev, T. V. Shamray
Abstract—
The article presents a comparative analysis of the fecundity of the Barents Sea red king crab, its size composition, and size at 50% maturity during the period of its expansion and acclimatization and at present during intense fishing. In addition, based on the published literature data, differences are estimated between the above parameters of Barents Sea individuals and individuals from the crab’s natural habitat. In 2019–2022, the Barents Sea red king crab showed a trend of decreasing its fecundity compared to the period of active acclimatization (1995–2003) before commercial exploitation started. In recent years, changes in the reproductive parameters of the Barents Sea red king crab population have increased the similarity of these characteristics to those for native populations from the Pacific region that began to be actively exploited in the early 20th century.
{"title":"Development of Fecundity of Red King Crab during Its Acclimatization in the Barents Sea","authors":"S. V. Bakanev, T. V. Shamray","doi":"10.1134/s000143702470022x","DOIUrl":"https://doi.org/10.1134/s000143702470022x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The article presents a comparative analysis of the fecundity of the Barents Sea red king crab, its size composition, and size at 50% maturity during the period of its expansion and acclimatization and at present during intense fishing. In addition, based on the published literature data, differences are estimated between the above parameters of Barents Sea individuals and individuals from the crab’s natural habitat. In 2019–2022, the Barents Sea red king crab showed a trend of decreasing its fecundity compared to the period of active acclimatization (1995–2003) before commercial exploitation started. In recent years, changes in the reproductive parameters of the Barents Sea red king crab population have increased the similarity of these characteristics to those for native populations from the Pacific region that began to be actively exploited in the early 20th century.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700292
A. N. Kolesnik, O. N. Kolesnik, S. A. Selyutin, A. A. Bosin, A. S. Astakhov
Abstract
A modified gravity corer (MGC) for more efficient and high-quality sediment core sampling is considered. Such design elements as the core catcher, section muff joints, the weight, and loop have been modified; the crown and locking plate have been removed. As a result of comparative testing in the South Chukchi Basin of the Chukchi Sea, it is shown that the MGC sampled 30% longer cores than the standard gravity corer (SGC). Judging from the distribution of such a redox-sensitive element as iron in the cores, when the MGС is used, a surface oxidized film remains in sediments. Thus, the disturbance of properties and textures/structures of sediments under sampling is the lowest.
{"title":"Modified Gravity Corer: Advantages and Offshore Testing","authors":"A. N. Kolesnik, O. N. Kolesnik, S. A. Selyutin, A. A. Bosin, A. S. Astakhov","doi":"10.1134/s0001437024700292","DOIUrl":"https://doi.org/10.1134/s0001437024700292","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A modified gravity corer (MGC) for more efficient and high-quality sediment core sampling is considered. Such design elements as the core catcher, section muff joints, the weight, and loop have been modified; the crown and locking plate have been removed. As a result of comparative testing in the South Chukchi Basin of the Chukchi Sea, it is shown that the MGC sampled 30% longer cores than the standard gravity corer (SGC). Judging from the distribution of such a redox-sensitive element as iron in the cores, when the MGС is used, a surface oxidized film remains in sediments. Thus, the disturbance of properties and textures/structures of sediments under sampling is the lowest.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700322
M. D. Kravchishina, A. A. Klyuvitkin, A. N. Novigatsky, A. G. Matul, V. V. Ivanov, D. A. Pestunov, Y. A. Shtabkin, B. V. Baranov, S. V. Galkin, A. K. Ambrosimov, N. V. Kozina, O. N. Lukianova, I. A. Nemirovakaya
Abstract
Multidisciplinary studies of the bottom sediments–water column–atmospheric water layer system in the Barents and Pechora seas and Baydaratskaya Bay of the Kara Sea were carried out on the expedition European Arctic–2023: Geological Record of Environmental and Climate Change during the season of polar night and active development of autumn–winter thermal convection. Fundamentally new data on a number of areas of oceanology were obtained in the cruise.
{"title":"Cruise 93 of the R/V Akademik Mstislav Keldysh: Geosystems of the Western Eurasian Arctic Shelves in the Season of Active Autumn–Winter Convection and Polar Night","authors":"M. D. Kravchishina, A. A. Klyuvitkin, A. N. Novigatsky, A. G. Matul, V. V. Ivanov, D. A. Pestunov, Y. A. Shtabkin, B. V. Baranov, S. V. Galkin, A. K. Ambrosimov, N. V. Kozina, O. N. Lukianova, I. A. Nemirovakaya","doi":"10.1134/s0001437024700322","DOIUrl":"https://doi.org/10.1134/s0001437024700322","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Multidisciplinary studies of the bottom sediments–water column–atmospheric water layer system in the Barents and Pechora seas and Baydaratskaya Bay of the Kara Sea were carried out on the expedition European Arctic–2023: Geological Record of Environmental and Climate Change during the season of polar night and active development of autumn–winter thermal convection. Fundamentally new data on a number of areas of oceanology were obtained in the cruise.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700279
N. V. Tsukanov
Abstract
The study examines the specific features of the structure and composition of strata of the Tyushevskaya basin of Eastern Kamchatka, which formed at the site of the Vetlovsky basin, which is marginal marine in nature. This structure probably began to form in the Late Eocene–Oligocene. A scheme for its evolution is proposed. In the modern structure, sediments of the Tyushevskaya basin overlie the material complexes and structures of various terranes and participate in the accretionary structure of the region. Sedimentary formations are predominantly facies-variable coarse coastal-marine and/or deltaic sediments, which change upsection to deeper-water flysch formations. Oil-bearing manifestations are associated with these complexes.
{"title":"Tyushevskaya Marine Paleobasin (Eastern Kamchatka): Composition and Development Features","authors":"N. V. Tsukanov","doi":"10.1134/s0001437024700279","DOIUrl":"https://doi.org/10.1134/s0001437024700279","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study examines the specific features of the structure and composition of strata of the Tyushevskaya basin of Eastern Kamchatka, which formed at the site of the Vetlovsky basin, which is marginal marine in nature. This structure probably began to form in the Late Eocene–Oligocene. A scheme for its evolution is proposed. In the modern structure, sediments of the Tyushevskaya basin overlie the material complexes and structures of various terranes and participate in the accretionary structure of the region. Sedimentary formations are predominantly facies-variable coarse coastal-marine and/or deltaic sediments, which change upsection to deeper-water flysch formations. Oil-bearing manifestations are associated with these complexes.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700243
N. V. Kozina, L. Ye. Reykhard, M. D. Kravchishina, A. S. Filippov, O. M. Dara, Ye. A. Novichkova, L. A. Lozinskaya, S. V. Slomnyuk
Abstract
Vivianite, an authigenic mineral from the phosphate class, was discovered in Kara Sea bottom sediments for the first time. Similar finds of vivianite were previously known only for the outer shelf of the Laptev Sea, the northern Barents Sea, and the eastern White Sea. Its presence in the subsurface sedimentary strata indicates desalinization of the surface layer of the sea. Core 7444, sampled in a tectonic depression in the Kara Sea during the first stage of cruise 89 of the R/V Akademik Mstislav Keldysh (2022), uncovered Holocene sedimentary strata up to 6.19 m thick. Coarse-silty and sandy vivianite formations are found throughout the entire core, starting from 0.11 m. Vivianite was investigated by a set of methods: optical microscopy, X-ray diffraction, and scanning electron microscopy with energy dispersive spectroscopy. The morphology, microstructures, and chemical composition of vivianite formations have been studied. Three morphological types of these formations have been identified: micronodules and their intergrowths, crystalline aggregates and their intergrowths, and tubular aggregates.
{"title":"First Finding of Vivianite in Kara Sea Bottom Sediments","authors":"N. V. Kozina, L. Ye. Reykhard, M. D. Kravchishina, A. S. Filippov, O. M. Dara, Ye. A. Novichkova, L. A. Lozinskaya, S. V. Slomnyuk","doi":"10.1134/s0001437024700243","DOIUrl":"https://doi.org/10.1134/s0001437024700243","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Vivianite, an authigenic mineral from the phosphate class, was discovered in Kara Sea bottom sediments for the first time. Similar finds of vivianite were previously known only for the outer shelf of the Laptev Sea, the northern Barents Sea, and the eastern White Sea. Its presence in the subsurface sedimentary strata indicates desalinization of the surface layer of the sea. Core 7444, sampled in a tectonic depression in the Kara Sea during the first stage of cruise 89 of the R/V <i>Akademik Mstislav Keldysh</i> (2022), uncovered Holocene sedimentary strata up to 6.19 m thick. Coarse-silty and sandy vivianite formations are found throughout the entire core, starting from 0.11 m. Vivianite was investigated by a set of methods: optical microscopy, X-ray diffraction, and scanning electron microscopy with energy dispersive spectroscopy. The morphology, microstructures, and chemical composition of vivianite formations have been studied. Three morphological types of these formations have been identified: micronodules and their intergrowths, crystalline aggregates and their intergrowths, and tubular aggregates.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700310
A. V. Yatsuk, M. A. Bovsun, R. B. Shakirov, A. V. Storozhenko, V. V. Kalinchuk, D. S. Makseev, I. G. Yugai, E. V. Lifansky, P. D. Zherdev, R. A. Grigorov, D. A. Shvalov, K. I. Aksentov, A. Y. Lazaryuk, E. I. Yaroshchuk
Abstract
The paper presents brief results of gas-geochemical and hydrometeorological studies of the outer water area of Peter the Great Bay (Sea of Japan), obtained as a result of a marine expedition study on the R/V Professor Gagarinskiy (cruise 83) in October–November 2022. Areal atmochemical measurements of climatically active gases (CH4, CO2, H2O vapor) and Hg(0) in the near layer of the atmosphere of the outer water area of Peter the Great Bay were performed for the first time. Gas geochemical fields in bottom sediments and water column are detailed. The current position of gas flares within the outer shelf of Posyet Bay is determined. Long-term stations for marine daily monitoring were carried out.
{"title":"Gas-Geochemical Studies of the Outer Water Area of Peter the Great Bay (Sea of Japan) on the R/V Professor Gagarinskiy, Cruise 83","authors":"A. V. Yatsuk, M. A. Bovsun, R. B. Shakirov, A. V. Storozhenko, V. V. Kalinchuk, D. S. Makseev, I. G. Yugai, E. V. Lifansky, P. D. Zherdev, R. A. Grigorov, D. A. Shvalov, K. I. Aksentov, A. Y. Lazaryuk, E. I. Yaroshchuk","doi":"10.1134/s0001437024700310","DOIUrl":"https://doi.org/10.1134/s0001437024700310","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents brief results of gas-geochemical and hydrometeorological studies of the outer water area of Peter the Great Bay (Sea of Japan), obtained as a result of a marine expedition study on the R/V <i>Professor Gagarinskiy</i> (cruise 83) in October–November 2022. Areal atmochemical measurements of climatically active gases (CH<sub>4</sub>, CO<sub>2</sub>, H<sub>2</sub>O vapor) and Hg(0) in the near layer of the atmosphere of the outer water area of Peter the Great Bay were performed for the first time. Gas geochemical fields in bottom sediments and water column are detailed. The current position of gas flares within the outer shelf of Posyet Bay is determined. Long-term stations for marine daily monitoring were carried out.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700218
S. V. Bakanev
Abstract—
The article presents analyses of the dynamics of injuries of the snow crab opilio in catches taken during surveys in 2008–2022, as well as data collected by observers in the fishery for this species in the Russian part of the Barents Sea in 2014–2022. The average proportion of injured crabs in catches taken during research surveys increased from 5–11% in 2008–2010 to 45% in 2022. The increase in the number of injured individuals in catches is higher for large males. The modeling results showed that the increased proportion of injured individuals in the period preceding commercial exploitation is associated with an increase in intrapopulation interactions, while during active commercial exploitation, it is associated with fishing pressure on the population, when some individuals, including crabs injured during capture, are returned to the sea after processing.
{"title":"Injuries as an Indicator of the Population Density and Fishing Intensity of Snow Crab (Chionoecetis opilio) in the Barents Sea","authors":"S. V. Bakanev","doi":"10.1134/s0001437024700218","DOIUrl":"https://doi.org/10.1134/s0001437024700218","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The article presents analyses of the dynamics of injuries of the snow crab opilio in catches taken during surveys in 2008–2022, as well as data collected by observers in the fishery for this species in the Russian part of the Barents Sea in 2014–2022. The average proportion of injured crabs in catches taken during research surveys increased from 5–11% in 2008–2010 to 45% in 2022. The increase in the number of injured individuals in catches is higher for large males. The modeling results showed that the increased proportion of injured individuals in the period preceding commercial exploitation is associated with an increase in intrapopulation interactions, while during active commercial exploitation, it is associated with fishing pressure on the population, when some individuals, including crabs injured during capture, are returned to the sea after processing.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700267
I. O. Leont’yev
Abstract
The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology. It is shown that the dynamics of the contour and profile of the coast can be described in terms of the diffusion equation, which allows for both attenuation and growth of relief perturbations. The conditions are determined under which the self-organization mechanism is activated and the resulting perturbations grow over time. Rhythmic structures of the coastal contour are traditionally associated with waves propagating at a large angle relative to the coastal normal. However, it has been shown that the self-organization of beach cusps and megacusps also occurs in normal coast waves due to the development of circulation cells in the surf zone. The conclusion is substantiated that the formation of nearshore bars under certain conditions is also determined by the self-organization mechanism. The results obtained help to interpret the available observational data regarding the evolution of multiple bar systems.
Abstract The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology.研究表明，海岸轮廓和剖面的动态可用扩散方程来描述，该方程允许地形扰动的衰减和增长。确定了自组织机制启动和由此产生的扰动随时间增长的条件。传统上，沿岸轮廓的韵律结构与相对于沿岸法线以大角度传播的波浪有关。然而，研究表明，在正常海岸波浪中，由于冲浪区循环单元的发展，也会出现滩尖和巨 穴的自组织现象。结论证明，在某些条件下，近岸条带的形成也是由自组织机制决定的。所获得的结果有助于解释有关多条带系统演变的现有观测数据。
{"title":"Rhythmic Patterns of a Sandy Coast and Self-Organization of the Relief","authors":"I. O. Leont’yev","doi":"10.1134/s0001437024700267","DOIUrl":"https://doi.org/10.1134/s0001437024700267","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology. It is shown that the dynamics of the contour and profile of the coast can be described in terms of the diffusion equation, which allows for both attenuation and growth of relief perturbations. The conditions are determined under which the self-organization mechanism is activated and the resulting perturbations grow over time. Rhythmic structures of the coastal contour are traditionally associated with waves propagating at a large angle relative to the coastal normal. However, it has been shown that the self-organization of beach cusps and megacusps also occurs in normal coast waves due to the development of circulation cells in the surf zone. The conclusion is substantiated that the formation of nearshore bars under certain conditions is also determined by the self-organization mechanism. The results obtained help to interpret the available observational data regarding the evolution of multiple bar systems.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700188
D. V. Kondar, P. V. Lepikhina, L. A. Garlitska, A. A. Udalov, M. V. Chikina, V. O. Mokievsky
Abstract—
The article describes the results of studies of two main components of meiobenthos—nematodes and harpacticoid copepods—conducted in Blagopoluchiya Bay (Novaya Zemlya, Kara Sea) in 2013 and 2020. The mosaic distribution of these two taxonomic groups was due to high species diversity and low occurrence of most species. Nevertheless, the authors identified patterns in the changes in the species structure of both groups related to the effect of two main environmental gradients (a spatial gradient related to the distance from the bay mouth to the sea and a depth-related gradient), as well as to the patchiness of sediment distribution. In 7 years between the two surveys in Blagopoluchiya Bay the abundance of nematodes increased tenfold, the copepod abundance also increased, but to a much lesser extent. Taxonomic changes in these two groups were observed at both species and family levels, with no differences in the taxa functional structure. The observed changes can be related to changes in abiotic factors and to general changes in the trophic system of the bay due to the establishment of the snow crab Chionoecetes opilio.
{"title":"Decadal Changes in Nematoda and Harpacticoida Taxocenes in Blagopoluchiya Bay (the Kara Sea)","authors":"D. V. Kondar, P. V. Lepikhina, L. A. Garlitska, A. A. Udalov, M. V. Chikina, V. O. Mokievsky","doi":"10.1134/s0001437024700188","DOIUrl":"https://doi.org/10.1134/s0001437024700188","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The article describes the results of studies of two main components of meiobenthos—nematodes and harpacticoid copepods—conducted in Blagopoluchiya Bay (Novaya Zemlya, Kara Sea) in 2013 and 2020. The mosaic distribution of these two taxonomic groups was due to high species diversity and low occurrence of most species. Nevertheless, the authors identified patterns in the changes in the species structure of both groups related to the effect of two main environmental gradients (a spatial gradient related to the distance from the bay mouth to the sea and a depth-related gradient), as well as to the patchiness of sediment distribution. In 7 years between the two surveys in Blagopoluchiya Bay the abundance of nematodes increased tenfold, the copepod abundance also increased, but to a much lesser extent. Taxonomic changes in these two groups were observed at both species and family levels, with no differences in the taxa functional structure. The observed changes can be related to changes in abiotic factors and to general changes in the trophic system of the bay due to the establishment of the snow crab <i>Chionoecetes opilio</i>.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-26DOI: 10.1134/s0001437024700176
T. N. Klimova, A. A. Subbotin, I. V. Vdodovich, Yu. A. Zagorodnyaya, D. A. Zabrodin
Abstract
The article presents the species diversity, abundance, and distribution features of ichthyoplankton and fodder zooplankton in the northern Black Sea in summer 2021. The intensification of cyclonic activity over the Black Sea in June–July slowed the formation of summer-type thermal stratification in the studied water area. At the beginning of July, only 13 species of eggs and fish larvae were observed in ichthyoplankton of the Crimean Peninsula, and their average abundance was 29 and 2 ind./m2, respectively. At the beginning of August, summer-type vertical thermal stratification off the coast of the Caucasus had already formed. The number of ichthyoplankton species increased to 20. Activation of atmospheric processes in June–July intensified the intraseasonal wind “pumping” of the upper layer of the sea. The Black Sea Rim Current transformed into a pronounced jet over the continental slope, oriented alongshore, partially extending to the shelf. This did not affect the spawning activity of mass fish species. The average abundance of eggs in the shelf and deep-water zone was about 160 ind./m2, and the average abundance of larvae on the shelf was almost five times higher, 452 ind./m2.
{"title":"Features of the Distribution of Black Sea Ichthyoplankton in Conditions of Activation of Atmospheric Processes in the Summer Hydrological Season of 2021","authors":"T. N. Klimova, A. A. Subbotin, I. V. Vdodovich, Yu. A. Zagorodnyaya, D. A. Zabrodin","doi":"10.1134/s0001437024700176","DOIUrl":"https://doi.org/10.1134/s0001437024700176","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article presents the species diversity, abundance, and distribution features of ichthyoplankton and fodder zooplankton in the northern Black Sea in summer 2021. The intensification of cyclonic activity over the Black Sea in June–July slowed the formation of summer-type thermal stratification in the studied water area. At the beginning of July, only 13 species of eggs and fish larvae were observed in ichthyoplankton of the Crimean Peninsula, and their average abundance was 29 and 2 ind./m<sup>2</sup>, respectively. At the beginning of August, summer-type vertical thermal stratification off the coast of the Caucasus had already formed. The number of ichthyoplankton species increased to 20. Activation of atmospheric processes in June–July intensified the intraseasonal wind “pumping” of the upper layer of the sea. The Black Sea Rim Current transformed into a pronounced jet over the continental slope, oriented alongshore, partially extending to the shelf. This did not affect the spawning activity of mass fish species. The average abundance of eggs in the shelf and deep-water zone was about 160 ind./m<sup>2</sup>, and the average abundance of larvae on the shelf was almost five times higher, 452 ind./m<sup>2</sup>.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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