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Povzetek: Between July 1967 and December 2023, 136 bluntnose sixgill sharks, Hexanchus griseus, were caught in the Sea of Marmara (SoM). Although both a generalised linear model (GLM) and the Mann-Kendall trend test indicated an increasing trend in annual landings of H. griseus, the estimated smoothing splines of the GLM regression trend line revealed a sharp decline in landings after 2017. While the capture depths ranged from 10 to 1,000 m since the early 2000s, the majority of specimens were caught in the shallow waters of the continental shelf. Deteriorating environmental conditions and increasing deoxygenation in the deep waters of the SoM coincide with a reduction in the capture depth of bluntnose sixgill sharks over the continental shelf. The evidence suggests an ongoing process of vertical habitat compression, which appears to be increasing the vulnerability of H. griseus to commercial fisheries in the SoM.
Ključne besede: Sixgill shark, overfishing, vulnerability, pollution, oxygen, decline
Objavljeno v DiRROS: 07.07.2026; Ogledov: 63; Prenosov: 46
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Povzetek: In a sample of common two-banded sea bream, Diplodus vulgaris, collected from the northern coast of Tunisia, one specimen displayed abnormal morphology. This individual presented a prominently developed upper margin, arched into a hump, a pointed upper head profile, and a strongly curved lateral line. X-ray imaging revealed abnormal curvatures in the vertebral column, such as hyperkyphosis and lordosis. A length-weight relationship analysis based on 49 normal specimens and the abnormal specimen showed a slightly negative allometry, suggesting that such specimens are capable of living alongside normal population in the wild.
Ključne besede: Diplodus vulgaris, hyperkyphosis, lordosis, environmental pollution, length-weight
Objavljeno v DiRROS: 24.06.2026; Ogledov: 160; Prenosov: 106
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Povzetek: Revitalisation of contaminated brownfield sites is essential for sustainable development, particularly near sensitive ecological areas like Natura 2000 sites. The lagoon in Slovenia’s Regional Park Šturmovci, an artificial wastewater convergence point created during hydroelectric construction, is a highly relevant example. This study integrates geochemical, mineralogical and isotopic analyses to identify sources and controlling mechanisms of contaminant distribution in lagoon sediments and assess their transfer to nearby agricultural soils during flooding events. Results indicate anaerobic conditions, with depth-related shifts in phosphorus, sulphur and redox-sensitive elements, such as rare earth elements (REE), arsenic (As), barium (Ba), cobalt (Co), chromium (Cr), lead (Pb) and vanadium (V), as well as fluctuations in pyrite-rich laminated layers, suggesting potential flood-driven remobilisation of trace elements. Lagoon sediments are highly contaminated with As (73 mg kg−1), Ba (247 mg kg−1), Pb (97 mg kg−1) and Zn (1118 mg kg−1), with elevated concentrations also observed in agricultural soil, all exceeding respective limit values of 20, 160, 85 and 200 mg kg−1. Pollutant concentrations were highest near wastewater inflows and decreased with distance, with nitrogen isotopic patterns indicating partial nitrification and surface ammonium accumulation, reflecting intensive agricultural inputs in the area. High enrichment factor (EF > 20) and geoaccumulation index (Igeo > 3) values, in particular for As, Cd and Zn, indicated severe contamination and highlighted the urgent need for effective remediation strategies, including immobilisation using biochar or cement-based binders, as well as phytoremediation approaches.
Ključne besede: brownfield, Natura 2000, pollution, revitalisation, ecological status
Objavljeno v DiRROS: 22.05.2026; Ogledov: 145; Prenosov: 132
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Ključne besede: cytotoxicity, genomic instability, in silico, indoor air pollution, public health
Objavljeno v DiRROS: 16.02.2026; Ogledov: 143; Prenosov: 111
Raziskovalni podatki (11,36 MB)
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Povzetek: The coal-fired Plomin Thermal Power Plant (Plomin TPP) in Croatia is located in the center of the east coast of the Istrian peninsula (northern Adriatic) and is considered the main source of historical air pollution in the region. Between 1970 and 2000, sulfur-rich coal from the local Raša coal mine was primarily used. In this study, a screening of content and fate of TPP-derived sulfur in soil around the power plant was made two decades after the S-rich coal was banned from use. Soil samples were collected at varying distances from the TPP in the prevailing wind direction (NE), along with a control sample taken more than 10 km away. The samples were analyzed for total sulfur, sulfate, organic sulfur (humic and fulvic), and the stable isotope composition of total sulfur (δ34S). Additionally, coal and coal ash were analyzed for total sulfur, sulfate and δ34S. Soil sampling along the prevailing wind direction from the Plomin TPP revealed markedly elevated sulfur content, with levels at 100 m downwind reaching up to 4 wt.%, which is over 100 times higher than the 0.04 wt.% measured at the control site located upwind. Sulfur content decreases sharply with increasing distance from the TPP, reflecting the deposition gradient along the prevailing wind path. Speciation analysis showed that over 95% of the sulfur in the soil is now present in organic form, mainly bound to humic acids. The δ34SVCDT values of the bulk coal used in the TPP ranged from −10.0 to −5.0‰. In most soil samples, the bulk δ34S values were positive (+7.0 to +20.0‰). The values of sulfate in soil range from +1.0 to +5.5‰, while those in organic sulfur range from −3.5 to +6.0‰. This indicates that atmospheric deposition of 34S-depleted fly ash and sulfate from coal are the most important sulfur sources, while some of the sulfur in the soil is also of marine origin. Finally, we showed that natural attenuation was a significant and efficient process within the sustainable management of the site historically contaminated by anthropogenic atmospheric sulfur deposition.
Ključne besede: historical pollution, soil, sulfur, stable isotopes, thermal power plant, coal, natural attenuation
Objavljeno v DiRROS: 15.01.2026; Ogledov: 462; Prenosov: 212
Celotno besedilo (1,47 MB)