1. Environmental DNA Metabarcoding of Cephalopod Diversity in the Tyrrhenian Deep Sea : version v 1.0Martina La Torre, Alex Cussigh, Valentina Crobe, Martina Spiga, Alice Ferrari, Alessia Cariani, Federica Piattoni, Federica Costantini, Silvia Franzellitti, Alberto Pallavicini, David Stanković, Sergio Stefanni, 2025, zaključena znanstvena zbirka raziskovalnih podatkov Povzetek: This dataset contains the raw demultiplexed reads of the study "Environmental Metabarcoding of Cephalopod Diversity in the Tyrrhenian Deep Sea". eDNA was extracted from water (wat) and sediment (sed) matrices, amplified with Ceph18S primers that specifically target cephalopods (de Jonge et al. 2021), and sequenced on IonTorrent platform. The names of the files indicate the sampling station (ST1, ST4, ST5, ST6), the replicate number (R1, R2), and the environmental matrix (wat, sed).
Ključne besede: eDNA metabarcoding, cephalopod assemblages, deep-sea biodiversity, Dohrn canyo, environmental matrices, reference databases, Tyrrhenian deep sea, Mediterranean deep sea
Objavljeno v DiRROS: 08.05.2026; Ogledov: 33; Prenosov: 22
 Raziskovalni podatki (11,19 MB)
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2. Machine learning-driven mapping of prokaryotic community diversity in the Mediterranean Sea using omics, earth observation, and model dataChristian Marchese, Maria Laura Zoffoli, Pierre Ramond, Tinkara Tinta, Neža Orel, 2026, izvirni znanstveni članek Povzetek: Marine prokaryotic communities are major contributors to oceanic food webs and global biogeochemical cycles. However, basin-scale diversity patterns and environmental drivers remain poorly understood. In this study, we applied a machine-learning framework to model the diversity of marine prokaryotic communities across the Mediterranean Sea. Diversity was quantified using the Shannon Diversity Index (SDI) derived from 16S rRNA gene sequencing. The in situ dataset included ~600 samples collected year-round from 2001 to 2023 at coastal and open-water sites, providing broad temporal coverage and multisite spatial sampling. We trained an XGBoost model using satellite-derived and modeled oceanographic variables matched to the SDI observations. The model achieved robust predictive performance (R2 = 0.78 for training and 0.70 for testing, with RMSE = 0.31 and MAPE = 0.05 across both) and captured broad basin spatial and seasonal patterns in prokaryotic community diversity, with greater uncertainty in less-represented regions. Diversity was highest in nutrient-rich coastal areas and during winter mixing, and lowest in summer-stratified or oligotrophic waters. SHAP analysis identified photoperiod as the most significant predictor, underscoring the central role of seasonal light cycles in shaping prokaryotic community diversity. Other predictors exhibited significant season- and region-dependent effects, each contributing positively within specific environmental thresholds. Climatological diversity maps revealed consistent spatiotemporal patterns, highlighting a notable west-to-east decrease in diversity and coastal hotspots. These results demonstrate that machine learning can identify major environmental drivers of prokaryotic diversity and upscale discrete observations to basin-wide predictions. This approach is transferable to other planktonic groups and supports scalable ecosystem monitoring across environmental gradients.
Ključne besede: prokaryotic community diversity, machine learning, Mediterranean Sea, omics, Shannon diversity index, remote sensing
Objavljeno v DiRROS: 04.05.2026; Ogledov: 84; Prenosov: 55
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3. Bottom trawling and environmental variables drive the biodiversity of mediterranean demersal assemblagesDavide Agnetta, Ivano Vascotto, Diego Panzeri, Igor Celić, Cosimo Solidoro, Tomaso Fortibuoni, Saša Raicevich, Simone Libralato, 2025, izvirni znanstveni članek Povzetek: Marine ecosystems are healthy with a high degree of biodiversity. Assessing how factors affect spatial and temporal patterns of biodiversity is an essential task for the Ecosystem Based Management approach. In this work, we investigated the effect of fisheries disturbance and ocean variables in determining α- and β-diversity of Mediterranean demersal assemblages. Generalized additive mixed models were used to explain the spatio-temporal variability of diversity indices from 2014 to 2020 in three Mediterranean subregions as a function of covariates. An in-depth analysis also made it possible to decouple the effects of bottom trawling from the other covariates. The results show that several fishing activities and environmental variables influence biodiversity, but the direction of change depends on the subregion considered. Bottom trawling instead has a quasi-linear erosion effect on α- and β-diversity in all areas. Valuable commercial species and threatened rays and sharks importantly characterized the sites with low fishing impact. Results are a step towards the development of conservation and management strategies, particularly in the context of the Marine Strategy.
Ključne besede: biodiversity, fishing, Mediterranean sea, marine strategy
Objavljeno v DiRROS: 28.10.2025; Ogledov: 557; Prenosov: 294
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5. Enhancing ex situ cultivation of Mediterranean Fucales: species-specific responses of Gongolaria barbata and Ericaria crinita seedlings to algal extractsAna Lokovšek, Martina Orlando-Bonaca, Edi Gljušćić, Andrea Bilajac, Ljiljana Iveša, Alberta Di Cave, Saverio Savio, Federico Ortenzi, Domen Trkov, Roberta Congestri, Annalisa Falace, 2025, izvirni znanstveni članek Povzetek: Mediterranean brown algal forests, dominated by Cystoseira sensu lato species, are undergoing widespread decline due to the cumulative effects of anthropogenic pressure and climate-related stressors. Restoration efforts increasingly rely on ex situ cultivation and outplanting of seedlings, yet early developmental stages often suffer from low survival and growth rates. This study investigated the potential of algal extracts to enhance the seedling development and survival in two canopy-forming species, Gongolaria barbata and Ericaria crinita. We tested extracts from a cyanobacterium (Trichormus variabilis), two microalgae (Desmodesmus sp. and Cylindrotheca closterium), and a commercial macroalgal formulation (AlgatronCifo®) at varying concentrations under controlled mesocosm conditions. Seedling performance was significantly influenced by extract type, and target species identity. Notably, a low-concentration Desmodesmus sp. extract (0.07 mg mL− 1 ) improved survival and growth, whereas T. variabilis exerted an inhibitory effect on G. barbata. AlgatronCifo® did not outperform Desmodesmus sp. extract in promoting seedling development. These findings suggest that specific extracts from green microalgae could improve protocols for the early stages of restoration, offering a scalable tool for rehabilitating degraded marine forests. However, the results underscore the importance of species-specific optimization and the need for in situ validation of biostimulant-based restoration approaches.
Ključne besede: Cystoseira s.l., seaweed biostimulants, microalgal extracts, seedling development, restoration, Mediterranean sea
Objavljeno v DiRROS: 22.09.2025; Ogledov: 590; Prenosov: 309
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8. Feeding habits of the invasive ctenophore Mnemiopsis leidyi in the Gulf of Trieste (Adriatic Sea)Borut Mavrič, Danijel Ivajnšič, Davor Lučić, Alenka Malej, Lovrenc Lipej, 2025, izvirni znanstveni članek Povzetek: The diet of the invasive ctenophore Mnemiopsis leidyi in the Gulf of Trieste was examined during its peak occurrence in the summer and early-autumn months (July to October) from 2017 to 2019, through the analysis of stomach contents. Altogether 506 specimens were individually caught for the analysis. A total of 3215 prey items were isolated and identified. Copepods emerged as the primary prey (relative abundance 66.7%), followed by cladocerans (7.7%), and bivalve larvae (6%). Notably, specimens of M. leidyi constituted a significant portion of the diet (5.4.%), providing further evidence of cannibalism within this species. Copepods were also the most commonly occurring prey items in the diet of M. leidyi. Most of them were represented by calanoid and cyclopoid nauplii (48.2%), followed by a harpacticoid M. norvegica (28.3%), and calanoids (26.8%). Other frequently occurring taxa were bivalve larvae (19.3%), M. leidyi (18.7%), and cladoceran Penilia avirostris (16.1%). The rate of cannibalism peaked in July, coinciding with a period of limited food availability. Additionally, the study revealed that fish eggs and larvae were infrequently found in the stomachs of M. leidyi. However, the presence of massive aggregations of M. leidyi may impact microzooplankton populations in late summer or autumn, potentially leading to competition with small pelagic fish.
Ključne besede: bioinvasion, cannibalism, comb jelly, competition, diet, Mediterranean Sea
Objavljeno v DiRROS: 10.04.2025; Ogledov: 1036; Prenosov: 541
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9. New records of rarely reported species in the Mediterranean Sea (March 2025)José Carlos Báez, Okan Akyol, Ernesto Azzurro, Pietro Battaglia, Ángel Belmonte-Gallegos, Georgios Christidis, Lovrenc Lipej, Borut Mavrič, Domen Trkov, Leon Lojze Zamuda, 2025, pregledni znanstveni članek Povzetek: This collective study presents information on fifteen (15) species recorded across five countries (Greece, Italy, Slovenia, Spain, and Türkiye) and four (4) ecoregions, ranging from the Alboran Sea to the Aegean Sea. The recorded species belong to three phyla: Mollusca (3 species), Arthropoda (3 species), and Chordata (9 species). Among mollusks, Martadoris mediterranea is reported for the first time in the Aegean Sea at two different locations, while Opisthoteuthis calypso and Octopoteuthis sicula are newly recorded in the western Mediterranean. Regarding arthropods, Ocypode cursor is reported from the Tyrrhenian coast of Sicily, Pachygrapsus transversus is recorded for the first time in the Tyrrhenian Sea, and Cancer pagurus in the Sea of Marmara. Among chordates, Lobotes surinamensis and Zu cristatus are newly recorded in the Alboran Sea, while Callionymus fasciatus and Sym-phodus doderleini are reported from Slovenian coastal waters. Tripterygion delaisi and Gymnothorax unicolor are documented for the first time in the waters of the Sea of Marmara and Crete, respectively. Additionally, new records of rarely reported fish species include Arctozenus risso, Chromogobius zebratus, and Epinephelus aeneus in Turkish, Spanish, and Italian waters, respectively.
Ključne besede: Mediterranean Sea, rare species, fish
Objavljeno v DiRROS: 10.04.2025; Ogledov: 9539; Prenosov: 717
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10. New records of introduced species in the Mediterranean Sea (February 2025)Periklis Kleitou, Daryl Agius, Sencer Akalin, Marco Albano, Izdihar Ammar, Coşkun Menderes Aydin, Ernesto Azzurro, Ana Fortič, Valentina Pitacco, Petra Slavinec, 2025, izvirni znanstveni članek Povzetek: This Collective Article compiles information on nineteen (19) species recorded in seven (7) Mediterranean countries (Croatia, Cyprus, Italy, Malta, Slovenia, Syria, and Türkiye) and across four major sub-basins (Adriatic, Western, Central, and Eastern Mediterranean). The documented taxa represent eight (8) phyla: Annelida (four species), Arthropoda (three), Bryozoa (one), Chordata (two), Cnidaria (two), Mollusca (five), Chlorophyta (one), and Ochrophyta (one). Observations originated from both dedicated scientific surveys (including trawl sampling, van Veen grabs, and harbor-wall scraping) and citizen science initiatives by divers, shell collectors, and recreational fishers. Significant first records include Notomastus aberans (Slovenia), Paraprionospio coora (Italy), Polydora cornuta (Tyrrhenian Sea), Coleusia signata (Cyprus), Penaeus aztecus (Malta), Pleopis schmackeri (Syria), Pteragogus trispilus (Italy), Triacanthus biaculeatus (Türkiye), Oculina patagonica (Syria), and Watersipora subatra (Slovenia). In the Mollusca group, Conomurex persicus extends its known range westward to the Messina Strait (southern Italy), and Sepioteuthis lessoniana is recorded for the first time in Italian waters. Additional first reports for Türkiye include Alveinus miliaceus and Retusa desgenettii in the Turkish Levantine Sea. The species Uroteuthis (Photololigo) arabica represents a first record for the entire Mediterranean basin. Finally, Colpomenia peregrina (Chlorophyta) and Caulerpa taxifolia (Ochrophyta) highlight ephemeral “boom-and-bust” occurrences in Croatia, raising questions about transient invasive dynamics. These collective findings underscore the importance of coordinated monitoring efforts, inclusive of both scientific and citizen-based approaches, to better understand and manage marine biodiversity shifts in the Mediterranean.
Ključne besede: invasive species, Mediterranean Sea, climate change
Objavljeno v DiRROS: 08.04.2025; Ogledov: 1330; Prenosov: 572
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