1. Faunistic, ecological, and zoogeographical survey of heterobranch fauna in the Adriatic Sea: experiences from SloveniaLovrenc Lipej, Ana Fortič, Domen Trkov, Borut Mavrič, Danijel Ivajnšič, 2025, izvirni znanstveni članek Povzetek: The heterobranch fauna recorded to date in the Slovenian part of the Adriatic Sea was reviewed and analysed in order to present an updated inventory. The ecological traits and zoogeographical affiliation of the recorded heterobranchs were also analysed. The new data revealed that the heterobranch fauna in the area consists of at least 157 species with the majority being nudibranchs (61.4%). The bulk of heterobranchs were considered as Atlanto-Mediterraneans. Heterobranch diversity was found to be significantly related to the number of sampling events. The spatial pattern of heterobranch species and their composition structure in parts of the study area were linked to specific human-impacted areas (HIAs) such as coastal wetlands, ports, and mariculture facilities. Better examination of less investigated environments, new sampling techniques, and citizen science involvement will doubtlessly increase the numbers in this checklist.
Ključne besede: Gastropoda, Heterobranchia, checklist, ecological traits, feeding guilds, zoogeography, mapping, Adriatic Sea
Objavljeno v DiRROS: 09.06.2025; Ogledov: 68; Prenosov: 29
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2. Mechanism of corrosion of cast aluminum-silicon alloys in seawater : Characterization and field testing of sol-gel-coated alloys in the Adriatic SeaIngrid Milošev, Barbara Kapun, Peter Rodič, Charly Carrière, Dimitri Mercier, Sandrine Zanna, Philippe Marcus, 2023, izvirni znanstveni članek 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: 333; Prenosov: 88
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3. Mechanism of corrosion of cast aluminum-silicon alloys in seawater : Characterization and field testing of bare alloys in the Adriatic SeaIngrid Milošev, Barbara Kapun, Peter Rodič, Charly Carrière, Dimitri Mercier, Sandrine Zanna, Philippe Marcus, 2023, izvirni znanstveni članek Ključne besede: aluminum-silicon cast alloys, field testing, scanning electron microscopy, x-ray photoelectron spectroscopy, marine immersion, Adriatic Sea
Objavljeno v DiRROS: 25.04.2025; Ogledov: 225; Prenosov: 83
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4. A Cladocora caespitosa bank (National Park Mljet, Adriatic Sea) under climate and anthropogenic impacts: a 20-year surveyPetar Kružić, Rita Guić, Lovrenc Lipej, Borut Mavrič, Romana Gračan, Pavel Ankon, 2025, izvirni znanstveni članek 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: 227; Prenosov: 95
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5. A short-term investigation of diel vertical migrations of the calycophoran Siphonophora in the open south Adriatic Sea (July 2003)Davor Lučić, Adam Benović, Mirna Batistić, Mira Morović, Ivona Onofri, Juan Carlos Molinero, Tjaša Kogovšek, Barbara Gangai, Marijana Miloslavić, 2011, izvirni znanstveni članek 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: 213; Prenosov: 157
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6. Jellyfish modulate bacterial dynamic and community structureTinkara Tinta, Tjaša Kogovšek, Alenka Malej, Valentina Turk, 2012, izvirni znanstveni članek Povzetek: Jellyfish blooms have increased in coastal areas around the world and the outbreaks have become longer and more frequent over the past few decades. The Mediterranean Sea is among the heavily affected regions and the common bloom - forming taxa are scyphozoans Aurelia aurita s.l., Pelagia noctiluca, and Rhizostoma pulmo. Jellyfish have few natural predators, therefore their carcasses at the termination of a bloom represent an organic-rich substrate that supports rapid bacterial growth, and may have a large impact on the surrounding environment. The focus of this study was to explore whether jellyfish substrate have an impact on bacterial community phylotype selection. We conducted in situ jellyfish - enrichment experiment with three different jellyfish species. Bacterial dynamic together with nutrients were monitored to assess decaying jellyfish-bacteria dynamics. Our results show that jellyfish biomass is characterized by protein rich organic matter, which is highly bioavailable to ‘jellyfish - associated’ and ‘free - living’ bacteria, and triggers rapid shifts in bacterial population dynamics and composition. Based on 16S rRNA clone libraries and denaturing gradient gel electrophoresis (DGGE) analysis, we observed a rapid shift in community composition from unculturable Alphaproteobacteria to culturable species of Gammaproteobacteria and Flavobacteria. The results of sequence analyses of bacterial isolates and of total bacterial community determined by culture independent genetic analysis showed the dominance of the Pseudoalteromonadaceae and the Vibrionaceae families. Elevated levels of dissolved proteins, dissolved organic and inorganic nutrient release, bacterial abundance and carbon production as well as ammonium concentrations characterized the degradation process. The biochemical composition of jellyfish species may influence changes in the amount of accumulated dissolved organic and inorganic nutrients. Our results can contribute insights into possible changes in bacterial population dynamics and nutrient pathways following jellyfish blooms which have important implications for ecology of coastal waters.
Ključne besede: sea, medusae, research programmes, DGGE, Pelagia noctiluca, gel electrophoresis, oligotrophic waters, Adriatic Sea, jellyfish, gelatinous zooplankton, bacteria, flavobacteria
Objavljeno v DiRROS: 26.03.2025; Ogledov: 241; Prenosov: 170
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7. Physiological and genomic characterization of two novel marine thaumarchaeal strains indicates niche differentiationBarbara Bayer, Jana Vojvoda, Pierre Offre, Ricardo JE Alves, Nathalie H Elisabeth, Juan A.L. Garcia, Jean-Marie Volland, Abhishek Srivastava, Christa Schleper, Gerhard J. Herndl, 2016, izvirni znanstveni članek Povzetek: Ammonia-oxidizing Archaea (AOA) are ubiquitous throughout the oceanic water column; however, our knowledge on their physiological and ecological diversity in different oceanic regions is rather limited. Here, we report the cultivation and characterization of two novel Nitrosopumilus strains, originating from coastal surface waters of the Northern Adriatic Sea. The combined physiological and genomic information revealed that each strain exhibits different metabolic and functional traits, potentially reflecting contrasting life modes. Strain NF5 contains many chemotaxis-related genes and is able to express archaella, suggesting that it can sense and actively seek favorable microenvironments such as nutrient-rich particles. In contrast, strain D3C is non-motile and shows higher versatility in substrate utilization, being able to use urea as an alternative substrate in addition to ammonia. Furthermore, it encodes a divergent, second copy of the AmoB subunit of the key enzyme ammonia monooxygenase, which might have an additional catalytic function and suggests further metabolic versatility. However, the role of this gene requires further investigation. Our results provide evidence for functional diversity and metabolic versatility among phylogenetically closely related thaumarchaeal strains, and point toward adaptations to free-living versus particle-associated life styles and possible niche differentiation among AOA in marine ecosystems.
Ključne besede: seawater, ammonia oxidation, bacteria, picoplankton, Northern Adriatic Sea, genomic information
Objavljeno v DiRROS: 19.03.2025; Ogledov: 218; Prenosov: 362
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8. First records of five opisthobranch mollusc species (Gastropoda: Heterobranchia) from South Adriatic Waters, MontenegroMilica Jovanović, Vesna Mačić, Domen Trkov, Martina Orlando-Bonaca, Lovrenc Lipej, 2020, drugi znanstveni članki Povzetek: Five new records of opisthobranch molluscs were reported for the first time in Montenegrin waters. Berghia verrucicornis and Doris ocelligera were collected as a bycatch with macroalgal samples, which were further analysed in the laboratory. Other three species: Aglaja tricolorata, Pleurobranchus testudinarius and Eubranchus tricolor, were identified and photographed during underwater visual census performed from 2011 to 2019. The total number of opisthobranchs recorded so far in the Montenegrin part of the Adriatic Sea increased to 76 species.
Ključne besede: opisthobranch, molluscs, Montenegro, Adriatic Sea
Objavljeno v DiRROS: 19.03.2025; Ogledov: 203; Prenosov: 336
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9. Status of the invasive blue crab Callinectes sapidus Rathbun, 1896 (Brachyura: Portunidae) in SloveniaLovrenc Lipej, Manja Rogelja, 2021, izvirni znanstveni članek Povzetek: Authors present data regarding the presence of the invasive blue crab Callinectes sapidus Rathbun, 1896 (Brachyura: Portunidae) based on records gathered from local fishermen. This alien species was firstly recorded in Slovenian coastal waters in March 2019 and it was subsequently found in six other cases in 2019, 2020 and 2021. Crabs were collected or sighted in shallow coastal areas along the Slovenian coast. In addition, authors discussed about the status of the blue crab in marine and coastal habitats of Slovenia.
Ključne besede: Adriatic Sea, invasive species, presence (bioloogy), Slovenia
Objavljeno v DiRROS: 19.03.2025; Ogledov: 191; Prenosov: 437
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