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Povzetek: In September 2024, a specimen of Maxmuelleria gigas (M. Müller, 1852) was found during a monitoring campaign in the Bay of Koper. This record is the second one of this less known macrobenthic species in the Slovenian Sea and one among few up to date reported in the Adriatic Sea, as well. Sediment mounds observed with an underwater video sledge on muddy bottom in the southern part of the Gulf of Trieste have been related to this species. The species distribution and density (47 per 100 m2) were estimated based on the quantification of the observed sediment mounds. The potential underestimation of the density and distribution of this species in the Gulf of Trieste in the past studies is discussed in relation to sampling method.
Ključne besede: Echiura, sediment mounds, videotransects, Northern Adriatic, marine biology
Objavljeno v DiRROS: 02.07.2025; Ogledov: 134; Prenosov: 61
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Povzetek: International law regularly operates with the term ‘minorities’ and related concepts when recognizing group specific rights, without actually setting out definitions on the protected groups. However, while the law itself is largely silent on the issue of conceptualization, the practice of monitoring organs can provide guidance in this regard. Therefore, this paper draws on the comparative legal analysis of the case law of UN human rights treaty bodies. Specifically, concluding observations on State reports will be analysed in the context of the Alpine Adriatic Pannonian area, including Slovenia and its neighbours as well as other former states of Yugoslavia. The paper aims to show the emerging consensus within the approaches of the individual treaty bodies, and to identify elements of the minority concept which appear systematically in the practice of all treaty bodies in the examined region, therefore contributing to the conceptualization of minorities in the framework of international human rights law.
Ključne besede: conceptualization of minorities, UN treaty bodies, Alpine Adriatic Pannonian area, legal regulation of the status of ethnic communities
Objavljeno v DiRROS: 12.05.2025; Ogledov: 382; Prenosov: 73
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Ključne besede: cast aluminium alloys, sol-gel coatings, field testing, scanning electron microscopy, x-ray photoelectron spectroscopy, marine immersion, Adriatic Sea
Objavljeno v DiRROS: 25.04.2025; Ogledov: 407; Prenosov: 118
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Povzetek: The Mediterranean endemic stony coral Cladocora caespitosa (Linnaeus, 1767) is the only reef-building and obligate zooxanthellate coral in the Mediterranean Sea. This endangered species is threatened by climate and anthropogenic impacts affecting the coastal zone of the Mediterranean Sea. Growth rates and colony state were monitored over 20 years on a C. caespitosa bank in the Marine Protected Area of Veliko Jezero in the Adriatic Sea (Mljet National Park, Croatia). The growth rate of corallites (from 2.02 mm to 5.32 mm annually) was similar to relevant studies in different areas of the Mediterranean Sea and showed a positive correlation with the average annual sea temperature. The coral colonies formed a highly aggregated bank and beds on rocky and sandy bottoms, from 6 to 18 m depth, within a semi-enclosed bay with high water exchange caused by tides. The marine area has experienced abnormally warm summers during the last two decades, with sea temperatures reaching up to 30°C driving population damage to the coral bank. Mortality events of C. caespitosa colonies caused by polyp bleaching and tissue necrosis, showed a positive correlation with high sea temperature anomalies during summer and autumn resulting in complete or partial mortality of the colonies. The excessive growth of macroalgal species on coral colonies seems to be a direct consequence of sewage discharges from nearby villages. The present climate-warming trend together with urbanization has severely and negatively affected the C. caespitosa coral bank in the Mljet National Park causing concerns for future viability.
Ključne besede: Adriatic Sea, coral bank, bioconstruction, ecological impacts, marine protected area
Objavljeno v DiRROS: 18.04.2025; Ogledov: 306; Prenosov: 130
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Povzetek: Morning, midday, evening and night repetitive sampling was used to demonstrate calycophoran diel vertical migration (DVM) at a fixed station in the oligotrophic southern Adriatic Sea at 8 depth intervals. Of 20 calycophoran species collected, most of them inhabited layers of specific temperature and light intensity, and migrated during the night. The deep species Kephyes ovata is primarily non-migratory. Typical nocturnal movements to the surface were recorded for Lensia conoidea and sphaeronectes koellikeri. Lensia subtilis and eudoxoides spiralis migrated toward the surface in the evening but sank deeper at night. Lensia meteori and Lensia fowleri reached upper layers at midday. The DVM of sphaeronectes irregularis was irregular and independent of diel light patterns. Though low in numbers, some calycophorans were found above the thermocline at night. For mesopelagic species, however, higher summer surface temperatures proved an effective barrier to migration above 100 m. Thus, certain species could be represented as key species of planktonic cnidarian assemblages found within a certain depth range. Though not homogenous, and while some undertake nocturnal migrations in both directions, all are interrelated by preferences of bathymetric distribution and specific DVM behavior.
Ključne besede: sea, medusae, biological research, abundance, bathimetric distribution, siphonophora, calycophoran siphonophores, composition, Adriatic Sea
Objavljeno v DiRROS: 26.03.2025; Ogledov: 262; Prenosov: 190
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