Forecast on the Caspian Sea Level and Its Effects on the Coastal Territory

Гусейнова, С. А.; Абдусамадов, А. С.

doi:10.18470/1992-1098-2015-4-119-126

Cited by 2 publications

(1 citation statement)

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“…Along with climate change [10], and the intensity of pollution [8,11,12], the ecological status of the Caspian Sea depends on cyclical changes in water level [13]. The change in the flow of the rivers is one of the reasons for the inter-annual dynamics of the hydrological regime of the Caspian.…”

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confidence: 99%

Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

Krupa

2019

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The work aimed to study the structural variables of zooplankton to assess the water quality of the Caspian Sea. Studies of zooplankton were conducted in the spring and summer of 2008 and 2010. Abundance, biomass, an average individual mass of a specimen, Shannon Bi, Shannon Ab, Δ-Shannon indices, and Clarke’s W-statistic were calculated for zooplankton. Quantitative variables of zooplankton were the highest in the Northeastern and Northern Caspian, decreasing towards the Middle Caspian. In the Northeastern and Northern Caspian from spring to summer, the number of zooplankton, and the values of Shannon Bi and Shannon Ab indices decreased; the values of Δ-Shannon and Clarke’s W-statistic increased. In the Middle Caspian, the biomass of the community increased; the values of Δ-Shannon and Clarke’s W-statistic decreased. From spring to summer, the value of an average individual mass of a specimen decreased over the entire surveyed area. The jellyfish Blackfordia virginica and Moerisia pallasi significantly influenced the size structure of the holoplankton. Seasonal dynamics of structural variables of zooplankton as well as changes in water transparency showed that water quality improved from spring to summer in the shallow northern and northeastern areas of the sea, and decreased in the deep-water Middle Caspian.

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Section: Introductionmentioning

confidence: 99%

Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

Krupa

2019

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Ecological condition of marine waters in the area of dredging operations of the kashagan field, Kazakhstan

Kanbetov,

Kulbatyrov,

Tulegenova

et al. 2024

Ûg Ross.: èkol. razvit.

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To determine the hydrophysical and hydrochemical parameters of sea water and their changes during dredging works in the north‐eastern part of the Caspian Sea along the Western Approach Route and near/inside block D, islands EPC‐2, EPC‐3, EPC‐4 and island A of the Kashagan field.Measurement of hydrophysical parameters: salinity, temperature, turbidity, dissolved oxygen concentration, electrical conductivity, pH of seawater was carried out using a portable multi‐parameter analyser "Horiba‐U53" directly in the water column. Water transparency was determined using a Secchi disc. The depth of the water layer was determined using a sounder. Hydrochemical investigations were carried out for seven parameters, with all components sampled in the near‐surface and benthic horizons. Water samples were taken using probes or bathometers: BM‐48, GR‐18 or their analogues.Hydrochemical analyses of seawater samples for: biogens (NO2, NO3, NH4, Ntotal, and Ptotal), synthetic surfactants, phenols, hydrocarbons including polyaromatic hydrocarbons (PAHS), heavy metals, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5). These were carried out in laboratory conditions using analytical equipment according to scientifically accepted methods.The data obtained as a result of the research allow us to draw the following conclusion: changes in the amount of suspended sediment in sea water lead to changes in physical and chemical properties of water (increase in turbidity, disturbance of sediment composition and properties), changes in biotopes, deterioration of oxygen regime, optical properties of water and temperature regime.

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Forecast on the Caspian Sea Level and Its Effects on the Coastal Territory

Cited by 2 publications

References 0 publications

Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

Ecological condition of marine waters in the area of dredging operations of the kashagan field, Kazakhstan

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