Hydrochemistry and nutrient distribution in southern deep-water basin of the Caspian Sea

Saleh, A. K. Md. Ehsanes; Hamzehpour, Ali; Mehdinia, Ali; Bastami, Kazem Darvish; Mazaheri, Said

doi:10.1016/j.marpolbul.2017.12.013

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…Therefore, this indicates that the chemo-biological properties of seawaters and nutrients are directly controlled by the hydrography of the Gorgan Bay, which water masses circulation has a counterclockwise pattern due to the Coriolis effects. , Moreover, satellite imagery (2006–2016) also confirmed that land-use change and increased agricultural fields and settlements (up to 59%) happened in the Gorgan Bay watershed, determining the discharge of agricultural waste in the area as probably the main cause of water quality decline. According to our results, the Department of Environment in Iran also reported that the aggregate ecoregions of PO 4 –3 and NO 3 –1 in the bay in 2016 were approximately higher than EPA criteria and the probability of a hypertrophic state was of 65%, raising serious concerns about Gorgan Bay. , …”

Section: Resultsmentioning

confidence: 55%

“…According to our results, the Department of Environment in Iran also reported that the aggregate ecoregions of PO 4 −3 and NO 3 −1 in the bay in 2016 were approximately higher than EPA criteria and the probability of a hypertrophic state was of 65%, raising serious concerns about Gorgan Bay. 44,47 3.2. Sterol Composition, Quantification, and Distribution in Abiotic Matrices.…”

Section: Resultsmentioning

confidence: 99%

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Steroid Fingerprint Analysis of Endangered Caspian Seal (Pusa caspica) through the Gorgan Bay (Caspian Sea)

Jafarabadi

Mashjoor

Dehkordi

et al. 2020

Environ. Sci. Technol.

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The profile of steroid congeners was evaluated in Caspian seals Pusa caspica by age, sex, and tissue-specific bioaccumulation, and compared with that of abiotic matrices (seawater, surface sediment, and suspended particulate materials, SPMs) from Miankaleh Wildlife/Gorgan Bay, (Caspian Sea, Iran). To identify the level of human fecal contamination, ∑25 sterol congeners were measured in all abiotic/biotic samples, revealing coprostanol, a proxy for human feces, as the most abundant sterol (seawater: 45.1–20.3 ng L–1; surface sediment: 90.2–70.3 ng g–1 dw; SPMs: 187.7–157.6 ng g–1 dw). The quantification of ∑25 sterols in seals followed the order of brain > liver > kidney > heart > blood > spleen > muscle > intestine > blubber > fur, and in both sexes coprostanol level (8.95–21.01% of ∑25s) was higher in blubber and fur, followed by cholesterol in brain, liver, kidney, heart, and blood, cholestanone in intestine and muscle, and β-sitosterol in spleen. Though no age/sex differentiation was observed, the mean concentration of ∑25s was higher in male than females and pup. Different diagnostic ratios revealed sterols originating from human and nonhuman sewage sources. Findings pinpoint the urgent necessity to investigate the ecotoxicity of fecal sterols in mammals, and consequent implications for human health.

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Steroid Fingerprint Analysis of Endangered Caspian Seal (Pusa caspica) through the Gorgan Bay (Caspian Sea)

Jafarabadi

Mashjoor

Dehkordi

et al. 2020

Environ. Sci. Technol.

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“…The Jordan River was the water recharge source for the Dead Sea. (Boehrer and Schultze, 2008;Deocampo and Jones, 2014;Saleh et al, 2018;Arnon et al, 2019). After the GOE, SO4 2is a common ion in saline lakes, and the stratification of saline lakes would transform the SO4 2into S 2in the deeper reducing layer, following which the enriched sulfurophiles (e.g., Pb, Zn, Fe) would be deposited as sulfides, including galena, sphalerite, and pyrite (Fig.…”

Section: Another Explanation For the Genesis Of Basin Related Pb-zn D...mentioning

confidence: 99%

“…Fig. 6 Schematic diagrams showing redox status of saline lakes since the 3.5 Ga (A, appearance of photosynthetic algae), and 2.4-2.2 Ga (Global Oxidation Event, stratification of B and full overturn of C) to present(Boehrer and Schultze, 2008;Deocampo and Jones, 2014;Saleh et al, 2018;Arnon …”

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confidence: 99%

Climate Affects Global Basin-Related Metallogeny

Zhang

2024

Preprint

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Abstract. The basin-related hydrothermal mineral deposits are the products of metal deposition in a relatively small area from metal-rich saline brines that source from basins. Recent studies have confirmed that the metal-rich ore-forming fluids were formed in semi-arid to arid environments, and are the products of a complex system involving precipitation, weathering, groundwater, precipitation-dissolution reactions, and evaporation. The evaporation is the main reason for the buildup of metals in saline brines. The formation of metal-rich saline brines is commonly accompanied by the formation of evaporites. The statistical results of basin-related mineral deposits worldwide show that there are two metallogenic periods after the great oxidation event: 2.1–1.4 Ga (Period I) and 0.8 Ga to present (Period II), with few scattered between these two periods (metallogenic quiescence period). In addition, Metallogenic Period II has five metallogenic peaks: ~380–340 Ma (II-1), ~300–240 Ma (II-2), ~160–100 Ma (II-3), 60–40 Ma (II-4), and one specific stratiform Cu metallogenic concentration period of ~580–500 Ma (II-5). These two metallogenic periods and five peaks are coupled with the widespread development of saline deposits in time. The basin-related ore deposits are mainly symmetrically occurring in 10°–60° in paleo-latitudes, which is consistent with the occurring latitudes of evaporites. The metallogenic quiescence period corresponded to the scarcity of saline deposits and was probably caused by the combination of a lack of hydrological closed basins and arid to semi-arid environments during 1.4–0.8 Ga. This quiescence period was coupled with the booming of stromatolites and the extremely thin continents, both of which suggest an Earth with flat continents that were covered by a hot and wet climate, and the widely developed shallow marine environments of the major continents at middle and low altitudes during 1.4–0.8 Ga.

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“…However, different anthropogenic activities discharge widespread pollutants into the sea (Bohluly et al, 2018), leading to high stress on fauna. The southern part of the Caspian Sea is of special concern because the sea surface rotation from north to south leads to accumulation of more contaminants such as microplastics in this area (Rasta, Rahimibashar et al, 2021; Saleh et al, 2018). Several studies have recently reported on microplastic pollution in different environmental matrices (Ghayebzadeh et al, 2020; Gholizadeh & Cera, 2022; Manbohi, Mehdinia, Rahnama, & Dehbandi, 2021; Manbohi, Mehdinia, Rahnama, Dehbandi, & Hamzehpour, 2021; Mataji et al, 2020) and in the digestive tract of fish (Abadi et al, 2021; Zakeri et al, 2020) from the southern coasts of the Caspian Sea.…”

Section: Introductionmentioning

confidence: 99%

Microplastic Pollution in the Gastrointestinal Tract and Gills of Some Teleost and Sturgeon Fish from the Caspian Sea, Northern Iran

Rasta,

Khodadoust,

Rahimibashar

et al. 2023

Enviro Toxic and Chemistry

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The increasing microplastic (MP) pollution in the marine environment has raised global concern. The main risk of MPs in aquatic ecosystem is their bioaccumulation in aquatic organisms. While some studies reported MPs pollution in the digestive system of the Caspian Sea fish species, there is no research on sturgeon species, nor on fish gills. Here, we investigated the occurrence of MPs in the gastrointestinal tract (GIT) and gills of 62 specimens belonging to four species including three teleosts (Cyprinus carpio, Rutilus kutum and Chelon aurata) and one sturgeon (Acipenser persicus, a valuable endangered species) from the Caspian Sea between January and March 2022. Fish tissues were removed, exposed for 24 h to 10 % KOH and then dried on the filter papers. Particles were observed under stereomicroscope and analyzed by Raman micro‐spectrometry, SEM and EDS. A total of 91 MPs were detected in GIT (averaged 1.46 ± 1.17 items/individual) and 63 MPs in gills (averaged 1.01 ± 0.62 items/individual). There was not significant correlation between the number of MPs found in the both tissues and the fish body length, body weight, GIT weight and gill weight (P > 0.05), except between MPs isolated from gills and gill weight in C. carpio (rs = 0.707, P = 0.022). MPs abundance in the fish followed the order of A. persicus > C. aurata > R. kutum > C. carpio. MPs were found in the size range of 45−5000 µm and the particles with 300‒1000 µm in size were the most prevalent. MPs were common by fiber (74.68 %) in shape, red (30.53 %) in color and nylon (70.6 %) in polymer.

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Hydrochemistry and nutrient distribution in southern deep-water basin of the Caspian Sea

Cited by 17 publications

References 17 publications

Steroid Fingerprint Analysis of Endangered Caspian Seal (Pusa caspica) through the Gorgan Bay (Caspian Sea)

Steroid Fingerprint Analysis of Endangered Caspian Seal (Pusa caspica) through the Gorgan Bay (Caspian Sea)

Climate Affects Global Basin-Related Metallogeny

Microplastic Pollution in the Gastrointestinal Tract and Gills of Some Teleost and Sturgeon Fish from the Caspian Sea, Northern Iran

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