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Povzetek: This dataset contains data obtained with underwater surveys using quadrats in the Gulf of Trieste (Adriatic Sea, Mediterranean Sea). The aim was to assess the function of empty Pinna nobilis shells as refuges for motile epibenthic macroinvertebrates across vegetated and unvegetated habitats. The dataset includes sampling location information, data about P. nobilis shells, species list and whole mobile invertebrates community dataset.
Ključne besede: habitat engineering, benthic community, mass mortality, macroinvertebrates, Northern Adriatic, Noble pen shell
Objavljeno v DiRROS: 27.05.2026; Ogledov: 126; Prenosov: 125
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Povzetek: Phytoplankton plays a fundamental role in marine ecosystems and is widely used to assess environmental change. In this study, light microscopy and DNA metabarcoding approaches were used to investigate phytoplankton communities at three long-term monitoring sites in the northern Adriatic Sea. By combining the two approaches, more than 500 species were recorded. Metabarcoding detected substantially higher diversity, particularly among small and fragile organisms that are difficult to identify under a microscope, whereas microscopy was better for identifying larger species with distinctive morphology. Because species contain different amounts of genetic material, DNA data can overestimate or underestimate their true contribution to the community. Indeed, after applying correction factors that account for these differences, the DNA-based estimates became more consistent with the microscopy results for several phytoplankton groups. The differences among the samples were influenced more by the approach used than by the sampling location. Overall, combining these two approaches provides an accurate and robust picture of phytoplankton communities. In this way, it is possible to improve the reliability of marine biodiversity assessments and to support better environmental monitoring and management in coastal seas.
Ključne besede: phytoplankton, diversity, environmental DNA, Long-Term Ecological Research, amplicon sequencing, North Adriatic Sea
Objavljeno v DiRROS: 25.03.2026; Ogledov: 289; Prenosov: 220
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Povzetek: The noble pen shell (Pinna nobilis) is experiencing mass mortality events across the Mediterranean Sea. In the northern Adriatic, as in many other regions, soft-bottom habitats are now covered with numerous empty shells. To assess their ecological role, we conducted underwater SCUBA surveys using quadrats in 2023 and 2024. We examined the function of empty shells as refuges for motile epibenthic macroinvertebrates across vegetated and unvegetated habitats. Specifically, we compared invertebrate diversity among habitats with and without shells, assessed the influence of shell orientation on community composition, and identified taxa characteristic of each habitat type using non-invasive methods that did not displace shells. Most shells remained upright, though their density and orientation varied among the six study locations. We recorded fauna from seven classes, with malacostracans and gastropods being the most species-rich groups. Biodiversity metrics differed markedly among the four microhabitat types (sediment, sediment with shells, meadow, meadow with shells), reaching the highest values in meadows with shells and the lowest in bare sediment. Malacostracans and polyplacophorans were significantly more abundant in samples containing shells, while other taxa showed no consistent trends. Shell orientation did not affect the composition of motile fauna, but distinct assemblages were associated with specific habitat types. These findings highlight the ecological importance of P. nobilis shells as microhabitats that enhance coastal biodiversity even after the death of the organism and underline the potential negative consequences of their degradation or removal.
Ključne besede: habitat engineering, benthic community, mass mortality, macroinvertebrates, Northern Adriatic, Noble pen shell
Objavljeno v DiRROS: 16.03.2026; Ogledov: 354; Prenosov: 209
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Povzetek: The mucilage phenomenon consists of the appearance of large gelatinous aggregates floating in the water column. In summer 2024, this event has reappeared in the Northern Adriatic Sea (NAS) on a large scale. This study provides an integrated characterization of the microalgal community within mucilage aggregates and surrounding waters in two NAS areas (Gulf of Trieste and Conero Riviera) using light microscopy (LM), metabarcoding (MB) based on ribosomal 18S V4 and V9 markers, and scanning electron microscopy (SEM) for selected taxa identification. Mucilage aggregates acted as dynamic microbial hotspots, hosting a rich diatom community, with abundances 1–2 orders of magnitude higher than in the surrounding water. Dominant diatom species were Cylindrotheca closterium, Nitzschia spp., Nitzschia gobbii, and Thalassionema nitzschioides. Some phytoflagellates (e.g., Tetraselmis spp.) and dinoflagellates (e.g., Karlodinium veneficum, Pseliodinium fusus, and Wangodinium sinense) were detected exclusively by MB, while LM and SEM revealed species missed by other approaches. Gonyaulax fragilis, one of the species indicated as an important mucus producer, was present at the onset and throughout the phenomenon, as detected by LM and MB. The integrated approach improves knowledge of microalgal communities in NAS mucilage.
Ključne besede: mucilage, Northern Adriatic Sea, phytoplankton, microalgae, metabarcoding, microscopy, Gonyaulax fragilis, Harmful Algal Blooms
Objavljeno v DiRROS: 27.01.2026; Ogledov: 447; Prenosov: 356
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Povzetek: The deep Southern Adriatic is a Mediterranean region highly sensitive to climate change, influenced by dense water cas-cading from the northern Adriatic and heat/salt transport from the Eastern Mediterranean. Historical (since 1957) andmodern (permanent and opportunistic temperature and salinity sampling, Argo floats, fixed moorings) measurementsreveal a substantial change since the mid-2000s in thermohaline properties. Historically marked by steady increases intemperature, salinity, and density, with substantial saw-tooth decadal variability, the near-bottom Southern Adriatic hasexperienced unprecedented warming (0.8C) and salinization (0.2) over the past decade, accelerating in time and revers-ing density trends. The inflow of much more saline waters reduced stratification and altered dense water properties atits source in the northern Adriatic. This at least fivefold acceleration of the high-emission regional climate projectionsmay have substantial effects on the Adriatic biogeochemistry and living organisms, changing sea level trends and more.
Ključne besede: Adriatic Sea, dense water, global warming, Gulf of Trieste
Objavljeno v DiRROS: 23.01.2026; Ogledov: 357; Prenosov: 290
Celotno besedilo (1,97 MB)
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