Mnemiopsis Leidyi Impact on Some Trophical Chains of the Caspian Sea

Камакин, Андрей Михайлович; Чиженкова, Ольга Алексеевна; Зайцев, Вячеслав Федорович

doi:10.18470/1992-1098-2010-2-67-74

Cited by 4 publications

(3 citation statements)

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“…Content of mercury and arsenic by atomic adsorption spectrometry using the universal spectrometric complex USK "Gamma-plus" (ZAO "NTC Expertcenter", Moscow, Russia). In the raw meat the arsenic content was determined according to the GOST R51766-2001 5 , of the mercury -by GOST 26927-86 6 , in the vegetation -by GOST 34427-2018 7 , in water -by GOST 31950-2012 8 , in soil -by PND F 16.1.2.23-2000 9 .…”

Section: Mutton Of the Sheep Living Within The Borgoy Depressionmentioning

confidence: 99%

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Analysis of the substances migration within the trophic chain “soil — plant — raw meat materials”

Bazhenova,

Egorova,

Tcybenov

et al. 2024

Teor. prakt. pererab. mâsa (Print)

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The trophic chain, which manifests the correlation at nutritional level between various macro- and microorganisms, is an important factor of the ecosystem; it can show the migration of various substances within the chain “soil — water — plant — animals”. The trophic chain in Borgoy depression area was studied due to the profound correlation between the compositional characteristics of the soil and pronounced organoleptic features of meat of the sheep that feed on grass in this area. For the experiments, control and experimental samples of soil, water, plants and mutton meat were examined. The samples taken near the saline lake within the Borgoy depression on the west of Beloozersk village served as an experimental sample. The samples taken 30 km from the salt lake near Petropavlovsk village in the Republic of Buryatia served as control sample. Experiments have shown that the soil of the Borgoy depression is a saline soil, with a depth of the salt horizon of 0–30 cm, and the salt belongs to chloride-sulfate-soda type of salinity. It is noted that the saline soil is characterized by a much higher content of carbonates, chlorides and cations of sodium, potassium and magnesium. Correlation was found between the isotopic composition in soil, vegetation and the raw meat materials. More profound certain organoleptic features of Borgoy mutton were noted. It’s highly probable that this fact is associated with the peculiarities of the mineral, chemical, and amino acid compositions of meat of the livestock that lives in the pastures of the Borgoy depression, characterized by saline soils. Despite the increased content of heavy metals such as lead and copper in the soil, data on sheep muscle tissue showed that all values of toxic elements content are within the permissible concentration range. The transfer of heavy metals from the soil to the aboveground part of plants is hindered by the underground root part, which serves as barrier.

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Section: Mutton Of the Sheep Living Within The Borgoy Depressionmentioning

confidence: 99%

“…The authors [9] studied the specific features of the Caspian sea trophic chain: plankton -mollusks -fish. Research allows identifying the reason for the quality deterioration of fish food base.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the substances migration within the trophic chain “soil — plant — raw meat materials”

Bazhenova,

Egorova,

Tcybenov

et al. 2024

Teor. prakt. pererab. mâsa (Print)

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“…In recent decades, the anthropogenic impact associated with 2 of 16 expanding hydrocarbon resource exploitation has increased [8]. In addition, biological pollution by invasive alien organisms plays a no less important role in transforming the Caspian ecosystem [9][10][11][12][13][14][15][16][17][18][19][20][21]. The functioning of the ecosystem of the Caspian Sea is largely determined by the river flow regime, the volume and the chemical composition of river runoff affecting the primary production link of the marine ecosystem by determining the structure and functional characteristics of phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Long-Term Phytoplankton Dynamics in the Middle Caspian According to Satellite Data and In Situ Observations in the First Decades of the 21st Century

Востоков

Паутова

Sahling

et al. 2023

JMSE

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Seasonal and long-term variability of phytoplankton in the Middle Caspian was studied based on remote sensing data of the sea by SeaWiFS and MODIS-Aqua scanners in 1998–2021 and the results of field observations in 2004–2021. The seasonal variability of chlorophyll “a” (CHL) calculated from satellite data using a regional algorithm indicated that the autumn and winter seasons were the main phytoplankton production periods of the year. In summer, a period of stagnation was observed in phytoplankton growth in the surface layer. However, according to satellite data in the first months of each year, winter blooms were observed recurrently in the Middle Caspian Sea, as confirmed by the results of field observations in 2004–2021. The phytoplankton biomass during the winter vegetation period reached 4.5–5.0 g/m3. In the first decade of the century (2004–2006), winter blooms were almost entirely (as much as 96%) formed through the mass growth of the alien diatom Cerataulina pelagica. In the modern period (2021), the winter bloom was formed both by three endemic diatom species Thalassionema nitzschioides, Cyclotella comta and Dactyliosolen fragilissimus and by two alien species Pseudo-nitzschia seriata and Cerataulina pelagica. In spring, the diatom Cyclotella caspia and the dinoflagellate Prorocentrum micans, both endemics, dominated. In summer, the phytoplankton biomass was composed of the mass growth of small flagellates and dinoflagellates in the seasonal thermocline layer, which current remote sensing methods cannot record. The diatoms’ contribution to the community’s total biomass in summer did not exceed 3%. In the autumn phytoplankton, the main role was played by a diatom component represented by alien species, mainly Chaetoceros peruvianus.

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New data on the ctenophore <i>Beroe ovata</i>, an invader to the Caspian Sea

Востоков

Vostokova

Lobachev

et al. 2022

Ûg Ross.: èkol. razvit.

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Aim. Analysis of new data on populations of invasive ctenopfores Вeroe ovata and Mnemiopsis leidyi in the Caspian Sea and assessment of adaptation of B. ovata to new habitat conditions. Material and methods. The data was obtained in the Dagestan sector of the Middle Caspian Sea in September-November 2021. Ctenophores and zooplankton were collected by a big cone plankton net (BC) with a 0.5 m 2 opening and a Juday plankton net (0.1 m 2 opening). Small ctenophores, eggs and zooplankton content were determined in samples fixed with formaldehyde to a final concentration of 4%. Results. In September-October 2021, the Вeroe ovata were detected in the shelf waters of Dagestan. The total number of ctenophores reached 32 ind/m 2 , biomass -10 g/m 2 . Individuals up to 35 mm in size were recorded. The abundance of M. leidyi in areas where B. ovata was found 3-10 times less often than in areas where it was absent. The habitat of Вeroe ovata was limited to the southern part of the Dagestan shelf and a salinity range of 7.1-5.5 psu. Conclusion.In 2021, new data was obtained on the Вeroe ovata in the Caspian Sea. The detection of B. ovata in the Caspian Sea in 2021 indicates that the ctenophore overcame winter conditions of the Caspian Sea. The fact determines the further evolution of the Caspian Sea ecosystem. The parameters of the impact of the new alien on the population of M. leidyi were recorded. An analysis of B. ovata distribution in the waters of the Dagestan shelf depending on environmental conditions was carried out.

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Mnemiopsis Leidyi Impact on Some Trophical Chains of the Caspian Sea

Cited by 4 publications

References 0 publications

Analysis of the substances migration within the trophic chain “soil — plant — raw meat materials”

Analysis of the substances migration within the trophic chain “soil — plant — raw meat materials”

Seasonal and Long-Term Phytoplankton Dynamics in the Middle Caspian According to Satellite Data and In Situ Observations in the First Decades of the 21st Century

New data on the ctenophore <i>Beroe ovata</i>, an invader to the Caspian Sea

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