Pub Date : 2024-08-26DOI: 10.1134/s0001437024700255
V. B. Kurnosov, Yu. I. Konovalov, K. R. Galin
Abstract
The article presents the results of studying changes in the chemical composition of Upper Pleistocene sediments from Hole ODP 1036A drilled in the Middle Valley of the Juan de Fuca oceanic ridge at the Dead Dog hydrothermal field to a depth of 38.50 m, 9 m from a black smoker with a temperature of 268°C. The most significant changes in sediment chemistry occurred in the lower intervals of the hole. In the 20–30.70 m interval, the concentration of a large number of chemical elements increased and, accordingly, the hydrothermal fluid was depleted of these elements. Conversely, in the 30.70–38.5 m interval, the concentration of most chemical elements decreased, which led to significant enrichment of hydrothermal fluid in these elements.
{"title":"Changes in the Composition of Upper Pleistocene Sediments in the Center of an Active Hydrothermal System (Middle Valley, Juan De Fuca Ridge, Pacific Ocean)","authors":"V. B. Kurnosov, Yu. I. Konovalov, K. R. Galin","doi":"10.1134/s0001437024700255","DOIUrl":"https://doi.org/10.1134/s0001437024700255","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article presents the results of studying changes in the chemical composition of Upper Pleistocene sediments from Hole ODP 1036A drilled in the Middle Valley of the Juan de Fuca oceanic ridge at the Dead Dog hydrothermal field to a depth of 38.50 m, 9 m from a black smoker with a temperature of 268°C. The most significant changes in sediment chemistry occurred in the lower intervals of the hole. In the 20–30.70 m interval, the concentration of a large number of chemical elements increased and, accordingly, the hydrothermal fluid was depleted of these elements. Conversely, in the 30.70–38.5 m interval, the concentration of most chemical elements decreased, which led to significant enrichment of hydrothermal fluid in these elements.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"4 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178022","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/s0001437024700280
V. I. Kaevitser, V. M. Smirnov, I. V. Smolyaninov
Abstract
The study presents and analyzes the experimental results of geological and geomorphological observations in some marine areas with active gas emission from bottom sediments. The study was carried out using an instrumental complex of geophysical sonar equipment, which included a subbottom profiler and side scan bathymetric sonar that uses an interferometric method for measuring depths in the field of view. The results confirm the possibility of using the complex to classify the seabed morphology and control the processes of gas unloading. The use of sonar equipment for remote seabed mapping during satellite observations can be used to interpret the results of satellite remote sensing of the atmosphere.
{"title":"Use of Sonar Systems to Detect Areas of Gas Discharge of the Seabed","authors":"V. I. Kaevitser, V. M. Smirnov, I. V. Smolyaninov","doi":"10.1134/s0001437024700280","DOIUrl":"https://doi.org/10.1134/s0001437024700280","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study presents and analyzes the experimental results of geological and geomorphological observations in some marine areas with active gas emission from bottom sediments. The study was carried out using an instrumental complex of geophysical sonar equipment, which included a subbottom profiler and side scan bathymetric sonar that uses an interferometric method for measuring depths in the field of view. The results confirm the possibility of using the complex to classify the seabed morphology and control the processes of gas unloading. The use of sonar equipment for remote seabed mapping during satellite observations can be used to interpret the results of satellite remote sensing of the atmosphere.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"7 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178024","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/s0001437024700231
E. M. Panova, A. V. Agafonov
Abstract—
Recently, an acoustic individual identification (AIID) approach based on recognition of dolphins by individually distinctive calls such as “signature whistles” has been applied to bottlenose dolphins Tursiops truncatus. Some other Odontoceti species can also have individually specific calls: e.g., in beluga whales Delphinapterus leucas, these are so-called “contact calls”. In this pilot study, we have tested the possibility of using the presumed contact calls of belugas to obtain the data on occurrence, number, and individual composition of their local aggregations in the natural environment. We have concluded that the diversity of contact calls can serve as an acceptable indicator of the number of individuals in the research area; in addition, these calls are potentially applicable for individual acoustic identification in belugas.
{"title":"Monitoring of a Seasonal Local Aggregation of Beluga Whales Delphinapterus leucas Based on Presumed Identification “Contact Calls”: a Pilot Study","authors":"E. M. Panova, A. V. Agafonov","doi":"10.1134/s0001437024700231","DOIUrl":"https://doi.org/10.1134/s0001437024700231","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>Recently, an acoustic individual identification (AIID) approach based on recognition of dolphins by individually distinctive calls such as “signature whistles” has been applied to bottlenose dolphins <i>Tursiops truncatus</i>. Some other Odontoceti species can also have individually specific calls: e.g., in beluga whales <i>Delphinapterus leucas</i>, these are so-called “contact calls”. In this pilot study, we have tested the possibility of using the presumed contact calls of belugas to obtain the data on occurrence, number, and individual composition of their local aggregations in the natural environment. We have concluded that the diversity of contact calls can serve as an acceptable indicator of the number of individuals in the research area; in addition, these calls are potentially applicable for individual acoustic identification in belugas.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"10 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177981","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/s0001437024700164
I. N. Sukhanova, M. V. Flint, A. V. Fedorov, A. A. Nedospasov, S. G. Poyarkov
Abstract—
The material was obtained during cruise 92 of the R/V Akademik Mstislav Keldysh in the area with a latitudinal extent of 72°32.0′ to 73°14.5′ N, including the Ob River estuary and adjacent shallow shelf on October 12–13 in the period preceding seasonal ice formation. The estuarine front was well pronounced in terms of salinity (gradients 0.6 PSU/km) and temperature fields and had a quasi-meridional direction. Sharp boundaries in nutrient distribution typical of earlier seasons were not observed. The abundance and biomass of phytoplankton varied from 22 × 103 to 75 × 103 cells/L and 7.3 to 19.0 mg/m3, respectively, which were two to three orders of magnitude lower than the values obtained in July and September. The abundance (30–78%) and biomass (28–80%) of phytoplankton over the entire area were formed by diatoms, among which Fragilariopsis cylindrus dominated. The abundance of freshwater diatoms Aulacoseira was low and the species was represented only by dead cells. A scheme is presented that shows the boundaries between phytoplankton communities of different composition and quantitative characteristics, as well as the specifics of conditions in the eastern area of the wide external part of Ob river estuary.
{"title":"Phytoplankton of the Ob Estuary (Kara Sea) in the Season Preceding Winter","authors":"I. N. Sukhanova, M. V. Flint, A. V. Fedorov, A. A. Nedospasov, S. G. Poyarkov","doi":"10.1134/s0001437024700164","DOIUrl":"https://doi.org/10.1134/s0001437024700164","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The material was obtained during cruise 92 of the R/V <i>Akademik Mstislav Keldysh</i> in the area with a latitudinal extent of 72°32.0′ to 73°14.5′ N, including the Ob River estuary and adjacent shallow shelf on October 12–13 in the period preceding seasonal ice formation. The estuarine front was well pronounced in terms of salinity (gradients 0.6 PSU/km) and temperature fields and had a quasi-meridional direction. Sharp boundaries in nutrient distribution typical of earlier seasons were not observed. The abundance and biomass of phytoplankton varied from 22 × 10<sup>3</sup> to 75 × 10<sup>3</sup> cells/L and 7.3 to 19.0 mg/m<sup>3</sup>, respectively, which were two to three orders of magnitude lower than the values obtained in July and September. The abundance (30–78%) and biomass (28–80%) of phytoplankton over the entire area were formed by diatoms, among which <i>Fragilariopsis cylindrus</i> dominated. The abundance of freshwater diatoms <i>Aulacoseira</i> was low and the species was represented only by dead cells. A scheme is presented that shows the boundaries between phytoplankton communities of different composition and quantitative characteristics, as well as the specifics of conditions in the eastern area of the wide external part of Ob river estuary.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"10 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178015","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/s000143702470019x
D. A. Portnova, L. A. Garlitska
Abstract—
The nematode community was studied at eight stations in the eastern part of the East Siberian Sea shelf (43 m), along the slope, and at a deep-sea site (1350 m). All samples (depth range 43–1350 m) were collected with a MUC corer in the northeastern part of the East Siberian Sea during cruise ARA10C of the R/V Araon in 2019. The taxonomic composition of the nematode community is typical of the Siberian Arctic seas in summer–autumn. The nematode diversity of the East Siberian Sea is poor in comparison with other Russian Arctic seas. Nematode genera typical of the shelf and deep sea were identified. The nematodes density in the uppermost sediment layer increases from the southernmost station along the shelf, amount a maximum on the outer shelf, and decreases downhill with the minimum at the deepest site. It is suggested that the high nematode abundance and diversity on the outer slope was provided by high organic matter fluxes at the boundary of water masses, increasing the oxygen and silt content in sediments.
{"title":"Preliminary Data on the Depth Effect on the Nematode Community in the East Siberian Sea","authors":"D. A. Portnova, L. A. Garlitska","doi":"10.1134/s000143702470019x","DOIUrl":"https://doi.org/10.1134/s000143702470019x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The nematode community was studied at eight stations in the eastern part of the East Siberian Sea shelf (43 m), along the slope, and at a deep-sea site (1350 m). All samples (depth range 43–1350 m) were collected with a MUC corer in the northeastern part of the East Siberian Sea during cruise ARA10C of the R/V <i>Araon</i> in 2019. The taxonomic composition of the nematode community is typical of the Siberian Arctic seas in summer–autumn. The nematode diversity of the East Siberian Sea is poor in comparison with other Russian Arctic seas. Nematode genera typical of the shelf and deep sea were identified. The nematodes density in the uppermost sediment layer increases from the southernmost station along the shelf, amount a maximum on the outer shelf, and decreases downhill with the minimum at the deepest site. It is suggested that the high nematode abundance and diversity on the outer slope was provided by high organic matter fluxes at the boundary of water masses, increasing the oxygen and silt content in sediments.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"12 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178017","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/s0001437024700206
V. O. Mokievsky, A. V. Tchesunov, D. V. Kondar, L. A. Garlitskaya, D. T. Nguyen, T. X. P. Nguyen
Abstract—
Meiobenthic samples collected on the Côn Đảo archipelago (Vietnam) from two biotopes, in mangroves and on the adjacent reef flat areas, are analyzed. Quantitative characteristics of the dominant groups of meiobenthos are presented, and taxonomic composition of dominant taxa, nematodes, and harpacticoid copepods, are analyzed. It is shown that analysis of species composition is uninformative for a high species richness and a large number of unique species in each sample. It is more informative to use the generalized characteristics of communities, such as spectra of families and ecological and morphological groups of species. At the level of families and subfamilies, there are well-defined differences in the population of the sandy bottom and mangroves. The proportion of life forms in the different biotypes is informative for harpacticoid copepods. Big differences in the taxonomic composition of the studied bays are shown, interbiotopic differences make a smaller contribution to the overall diversity; i.e., each bay has its own set of species, which forms the population of each biotope. Nematodes and harpacticoids are distributed in space independently of each other.
{"title":"Meiobenthos of the Côn Đảo Islands (Vietnam): Differences in the Structure of Taxocenes of Reef Flats and Mangroves","authors":"V. O. Mokievsky, A. V. Tchesunov, D. V. Kondar, L. A. Garlitskaya, D. T. Nguyen, T. X. P. Nguyen","doi":"10.1134/s0001437024700206","DOIUrl":"https://doi.org/10.1134/s0001437024700206","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>Meiobenthic samples collected on the Côn Đảo archipelago (Vietnam) from two biotopes, in mangroves and on the adjacent reef flat areas, are analyzed. Quantitative characteristics of the dominant groups of meiobenthos are presented, and taxonomic composition of dominant taxa, nematodes, and harpacticoid copepods, are analyzed. It is shown that analysis of species composition is uninformative for a high species richness and a large number of unique species in each sample. It is more informative to use the generalized characteristics of communities, such as spectra of families and ecological and morphological groups of species. At the level of families and subfamilies, there are well-defined differences in the population of the sandy bottom and mangroves. The proportion of life forms in the different biotypes is informative for harpacticoid copepods. Big differences in the taxonomic composition of the studied bays are shown, interbiotopic differences make a smaller contribution to the overall diversity; i.e., each bay has its own set of species, which forms the population of each biotope. Nematodes and harpacticoids are distributed in space independently of each other.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"45 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178018","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/s0001437024700309
I. V. Miskevich, D. S. Moseev, A. S. Lokhov, E. I. Kotova
Abstract
The paper describes integrated research of the Krasnaya and Varkutsyakha rivers of Vaygach Island in the 2023 summer low water period, carried out by the Northwestern Branch of the Shirshov Institute of Oceanology. This research is aimed at studying the specifics of mixing zone formation for Arctic island lagoon estuaries. The maximum suspended particulate matter concentrations were found near the upper boundary of the mixing zone. The maximum metal accumulation zones were observed in the frontal area of estuaries and in the upper part for manganese and arsenic.
{"title":"Research of the Lagoon Estuaries of Vaygach Island in the 2023 Summer Low Water Period","authors":"I. V. Miskevich, D. S. Moseev, A. S. Lokhov, E. I. Kotova","doi":"10.1134/s0001437024700309","DOIUrl":"https://doi.org/10.1134/s0001437024700309","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper describes integrated research of the Krasnaya and Varkutsyakha rivers of Vaygach Island in the 2023 summer low water period, carried out by the Northwestern Branch of the Shirshov Institute of Oceanology. This research is aimed at studying the specifics of mixing zone formation for Arctic island lagoon estuaries. The maximum suspended particulate matter concentrations were found near the upper boundary of the mixing zone. The maximum metal accumulation zones were observed in the frontal area of estuaries and in the upper part for manganese and arsenic.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"10 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178027","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 : 2024-07-02DOI: 10.1134/s0001437024700127
V. K. Illarionov, O. Yu. Ganzha, D. A. Ilyinsky, K. A. Roginskiy, A. Yu. Borisova
Abstract
A comprehensive analysis of geological and geophysical data characterizing the structure of the eastern continental margin of India and the adjacent part of the bottom of the Bay of Bengal has been carried out. According to the structural and tectonic features, three sectors are distinguished: southern, central, and northern, the natural boundaries between which are the fault zones of the Makhanadi and Godavari–Krishna aulacogens. In the central sector, the pericontinental East Indian Plateau adjoins the continental slope. In 2003, the R/V Mezen acquired deep seismic sounding data on two profiles in this region. These data and their geological interpretation made it possible to identify “reduced” continental crust, characterized by reduced thickness of the upper, middle, and lower layers. A conclusion is drawn about the continental nature of the East Indian Plateau and northern part of the 85° Ridge adjacent to it. The light sialic and effusive rocks that form the top of the ridge give a negative gravimetric anomaly in the free-air reduction, which is its distinguishing feature.
{"title":"New Ideas about the Structure and Nature of the Crust of the Western Bay of Bengal, Obtained Taking into Account Deep Seismic Sounding Data","authors":"V. K. Illarionov, O. Yu. Ganzha, D. A. Ilyinsky, K. A. Roginskiy, A. Yu. Borisova","doi":"10.1134/s0001437024700127","DOIUrl":"https://doi.org/10.1134/s0001437024700127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A comprehensive analysis of geological and geophysical data characterizing the structure of the eastern continental margin of India and the adjacent part of the bottom of the Bay of Bengal has been carried out. According to the structural and tectonic features, three sectors are distinguished: southern, central, and northern, the natural boundaries between which are the fault zones of the Makhanadi and Godavari–Krishna aulacogens. In the central sector, the pericontinental East Indian Plateau adjoins the continental slope. In 2003, the R/V <i>Mezen</i> acquired deep seismic sounding data on two profiles in this region. These data and their geological interpretation made it possible to identify “reduced” continental crust, characterized by reduced thickness of the upper, middle, and lower layers. A conclusion is drawn about the continental nature of the East Indian Plateau and northern part of the 85° Ridge adjacent to it. The light sialic and effusive rocks that form the top of the ridge give a negative gravimetric anomaly in the free-air reduction, which is its distinguishing feature.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"21 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520539","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 : 2024-07-02DOI: 10.1134/s0001437024700061
S. B. Krasheninnikova, V. D. Chmyr, R. I. Lee, N. I. Minkina
Abstract
Based on contact data, the dynamics of the abundance (N) and biomass (B) of phytoplankton in 2013–2014 and the concentration of chlorophyll a (Cсhl) in 2000–2003 and 2008–2021 were analyzed using fast Fourier transform (FFT) under conditions of changing water temperature (T) in the vicinity of Sevastopol in the Black Sea. Estimates of the contribution made by the variability of the annual and semiannual harmonics of N, B, Cchl, T to the seasonal cycle amounted to more than 56% for all parameters. A significant relationship between B and Cchl (r < –0.83) at two stations indicates the aging of microalgae. The dominance of different groups of microalgae in the phytoplankton biomass has been detected. A typical period of 2–4 years is distinguished in the interannual variability of Cchl and T in different seasons.
{"title":"Long-Term Dynamics of Phytoplankton Parameters and Water Temperature in the Area of Sevastopol (Black Sea)","authors":"S. B. Krasheninnikova, V. D. Chmyr, R. I. Lee, N. I. Minkina","doi":"10.1134/s0001437024700061","DOIUrl":"https://doi.org/10.1134/s0001437024700061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Based on contact data, the dynamics of the abundance (<i>N</i>) and biomass (<i>B</i>) of phytoplankton in 2013–2014 and the concentration of chlorophyll <i>a</i> (<i>C</i><sub>сhl</sub>) in 2000–2003 and 2008–2021 were analyzed using fast Fourier transform (FFT) under conditions of changing water temperature (<i>T</i>) in the vicinity of Sevastopol in the Black Sea. Estimates of the contribution made by the variability of the annual and semiannual harmonics of <i>N</i>, <i>B</i>, <i>C</i><sub>chl</sub>, <i>T</i> to the seasonal cycle amounted to more than 56% for all parameters. A significant relationship between <i>B</i> and <i>C</i><sub>chl</sub> (<i>r</i> < –0.83) at two stations indicates the aging of microalgae. The dominance of different groups of microalgae in the phytoplankton biomass has been detected. A typical period of 2–4 years is distinguished in the interannual variability of <i>C</i><sub>chl</sub> and <i>T</i> in different seasons.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"3 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520534","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 : 2024-07-02DOI: 10.1134/s0001437024700097
A. V. Agafonov, P. K. Melnikova, E. M. Panova, I. V. Logominova, V. A. Litvin
Abstract
The article performs a comparative analysis of the underwater sounds of two sympatric dolphin species living in the Black Sea: bottlenose and common dolphins. During sound processing and analysis, the special program nanoCAD 22 was used. Both the similarity of the physical parameters of the sounds of the two species and a number of specific features of whistles characteristic of each were demonstrated. Common dolphin production of some types of whistles with significant similarities (sometimes almost identical) to the signature whistles of bottlenose dolphins was detected and analyzed.
{"title":"Whistles in the Vocal Repertoire of Bottlenose Dolphins (Tursiops truncatus Montagu, 1821) and Common Dolphins (Delphinus delphis Linnaeus, 1758)","authors":"A. V. Agafonov, P. K. Melnikova, E. M. Panova, I. V. Logominova, V. A. Litvin","doi":"10.1134/s0001437024700097","DOIUrl":"https://doi.org/10.1134/s0001437024700097","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article performs a comparative analysis of the underwater sounds of two sympatric dolphin species living in the Black Sea: bottlenose and common dolphins. During sound processing and analysis, the special program nanoCAD 22 was used. Both the similarity of the physical parameters of the sounds of the two species and a number of specific features of whistles characteristic of each were demonstrated. Common dolphin production of some types of whistles with significant similarities (sometimes almost identical) to the signature whistles of bottlenose dolphins was detected and analyzed.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"2012 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520536","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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