1. The haunting challenge of the trends and pathway assessments on newly introduced non-indigenous species in European seasOkko Outinen, Peter A.U. Stæhr, Romeu S. Ribeiro, Aina Carbonell, Martina Orlando-Bonaca, Borut Mavrič, 2026, original scientific article Abstract: The spread of aquatic non-indigenous species (NIS) is recognised as a major threat to the recipient regions ecosystems. The present study reviewed all NIS that have been introduced to the marine waters of the European Union (EU) until 2021, and their introduction pathways. Further, the study statistically analysed temporal trends in new NIS introductions and addressed uncertainties in relation to transporting pathways. Time-series analyses indicated that the observed trends in new NIS introductions have followed smoothly increasing trajectories for the entire study area, Mediterranean Sea, North-East Atlantic Ocean, and the Baltic Sea, whereas abrupt increase was detected for the Black Sea. It is noteworthy that the increasing trends started to slow down at the end of 2010s. Strongly increased research interest towards marine invasions since the early 2000s, and new environmental policies likely affected the observed trends. Future updates will be key to assessing whether this slowdown is truly a persisting trend or only an anomaly in the long term. The pathway assessment suffered from notable uncertainties, as the assigned confidence levels for pathways were low or unassigned for a large proportion of the introduced NIS in all study regions. Transport by shipping vectors was assigned as the most common pathway (51%) for new NIS introductions to EU seas, although there was very rarely direct evidence of this. The study highlights the need to overcome the pathway uncertainties, as robust information on introduction pathways is critical to manage new NIS introductions effectively.
Keywords: invasive alien species, marine bioinvasions, trend analysis, pathways, research interest
Published in DiRROS: 02.03.2026; Views: 239; Downloads: 178
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2. Phytosociological description of sites of Salvia hispanica L. (Lamiaceae) on riverine gravel terraces in western SloveniaIgor Dakskobler, Urban Šilc, Branko Vreš, 2019, original scientific article Abstract: In late summer and autumn (late August, beginning of November) of 2018 we observed a mass occurrence (more than 500 specimens) of Salvia hispanica, commonly known as chia, on gravel bars of several rivers in western Slovenia (the Soča and the Sava river basins). It was blooming on many sites in the first half of November, but low daily temperatures in the second half of the month prevented seed development. This Central-American (Mexico, Guatemala) species, which is distributed as a crop also outside its native range, grew mainly in initial plant communities of riverine gravel terraces classified into associations Polygono lapathifoliae-Salicetum eleagni (described as new), Chaerophyllo-Petasitetum officinalisand Bidenti frondosae-Panicetum barbipulvinati nom. prov. The dominating species in these associations are perennials or hemicryptophytes (50%) and annual plants – therophytes (32%). The proportion of alien species (neophytes) is 22% and the proportion of species originating in America is 10%. The warmer climate with less precipitation and less frequent high waters in the last decade, combined with the fact that chia seeds are a commercially available food product or an ingredient in various foods (nutrients), increases the likelihood of successful seed production in chia plants and their distribution in nature. The threat of Salvia hispanicabecoming an invasive species is therefore serious.
Keywords: chia, alien (adventive) species, plant communites, riverine gravel terraces, syntaxonomy, Slovenia
Published in DiRROS: 27.01.2026; Views: 331; Downloads: 262
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3. Phacelia tanacetifolia Benth. (Hydrophylloideae, Boraginaceae): a first report as casual alien to the vascular flora of TunisiaRidha El Mokni, Amon-Allah El Mokni, Ranim El Mokni, 2025, not set Abstract: Floristic investigations in the central-eastern Tunisia (North Africa) led to the discovery of a small population of Phacelia tanacetifolia Benth. (Boraginaceae), a species reported native to the southwestern North America and naturalized in Europe, Australia and New Zealand. Our discovery represents the first record at the national level, and the third one for the southern Mediterranean shore (North Africa). Description, and phenology, together with its ecology in Tunisia are provided. Additionally, original photographs as well as a first assessment of the naturalization status of this taxon in Tunisia are here presented.
Keywords: alien species, floristics, new record, Boraginaceae, Monastir
Published in DiRROS: 24.01.2026; Views: 342; Downloads: 215
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4. On the distribution and conservation status of some Mediterranean species new for the flora of MontenegroDanijela Stešević, Milica Stanišić, Đorđije Milanović, Urban Šilc, 2025, original scientific article Abstract: Investigations of dune habitats in Montenegro led to the discovery of 8 taxa new for the country: Avellinia festucoides, Corynephorus divaricatus, Isoetes histrix, Juncus tenuis, Medicagodoliata, Myosotislaxa ssp. cespitosa, Setariaparviflora, and Solenopsislaurentia ssp. gasparrinii. Of particular importance are Solenopsislaurentia ssp. gasparrinii (not yet been recorded in the SE Adriatic) and Isoeteshistrix (doubtfully reported for Albania). Since only one or small number of additional localities are expected in Montenegro, species are proposed as candidates for the national list of legally protected species: Isoeteshistrix, Solenopsislaurentia ssp. gasparrinii, Avellinia festucoides and Corynephorusdivaricatus. According to the IUCN criteria, the Isoeteshistrix, Solenopsislaurentia ssp. gasparrinii and Corynephorusdivaricatus are assessed as CR, while Avellinia festucoides as EN. Monitoring and eradication measures are proposed for alien species (Setariaparviflora and Juncustenuis), especially for the second one, which is considered invasive.
Keywords: alien species, conservation, IUCN assessment, new records
Published in DiRROS: 24.01.2026; Views: 410; Downloads: 212
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5. Global Impacts Dataset of Invasive Alien Species (GIDIAS)Sven Bacher, Ellen Ryan-Colton, Mario Coiro, Phillip Cassey, Bella S. Galil, Martin A. Nuñez, Michael Ansong, Katharina Dehnen-Schmutz, Georgi Fayvush, Romina D. Fernandez, Maarten De Groot, 2025, complete scientific database of research data Abstract: We present the Global Impacts Dataset of Invasive Alien Species (GIDIAS), a global dataset of 22865 records including impacts of invasive alien species on nature, nature’s contributions to people, and good quality of life. Records include positive and negative impacts, neutral impacts (studies were carried out, but no impacts were documented), non-directional impacts (i.e., change without detriments or benefits for native species or people), and finally, some records of alien species where no studies were found that assessed their impacts (indicating data gaps). Records cover 3353 invasive alien species from all major taxa (plants, vertebrates, invertebrates, microorganisms) and all continents and realms (terrestrial, freshwater, marine). The data were compiled to serve as robust evidence for chapter 4 “Impacts of invasive alien species on nature, nature's contributions to people, and good quality of life” of the global assessment report on invasive alien species by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES; available on Zenodo at https://doi.org/10.5281/zenodo.7430731). The dataset is provided in a machine-readable CSV file (file name GIDIAS_20250417_machine_read.csv), with special language characters retained where used (UTF-8 format). The dataset is also provided in Excel format (file name GIDIAS_20250417_Excel.xlsx). Metadata is provided in Excel format, including descriptors for each variable (file name GIDIAS_metadata_20250417.xlsx). Additional explanations for GIDIAS is stored in Microsoft Word format (docx) and contains (1) a short description of the principles of Environmental and Socio-Economic Impact Classification for Alien Taxa (EICAT, SEICAT), (2) a description of the variables included in the Global Impacts Dataset of Invasive Alien Species GIDIAS, and (3) a compilation of the search strategies and datasets included in the Global Impact Dataset of Invasive Alien Species (GIDIAS).
Keywords: invasive alien species, research data
Published in DiRROS: 01.12.2025; Views: 528; Downloads: 296
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6. First report of an invasive Japanese beetle Popillia japonica Newman (Coleoptera, Scarabaeoidea) in SloveniaŠpela Modic, Eva Praprotnik, Primož Žigon, Jaka Razinger, Igor Nekrep, 2025, original scientific article Keywords: first finding, priority plant pest, scarab beetle, invasive alien species, DNA barcoding, hitchhiker, quarantine pest
Published in DiRROS: 25.09.2025; Views: 586; Downloads: 345
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7. Stakeholders' views on the global guidelines for the sustainableuse of non-native treesAna Novoa, Giovanni Vimercati, Giuseppe Brundu, David M. Richardson, Urs Schaffner, Antonio Brunori, Thomas Campagnaro, Susan Canavan, Laura Celesti-Grapow, Michele de Sá Dechoum, Marjana Westergren, 2025, complete scientific database of research data Abstract: A large number of non-native trees (NNTs) have been introduced globally and widely planted, contributing significantly to the world's economy. Although some of these species present a limited risk of spreading beyond their planting sites, a growing number of NNTs are spreading and becoming invasive, leading to diverse negative impacts on biodiversity, ecosystem functions, and human well-being. To help minimize the negative impacts and maximize the economic benefits of NNTs, Brundu et al. developed eight guidelines for the sustainable use of NNTs globally—the Global Guidelines for the Use of NNTs (GG-NNTs). We used an online survey to assess perceptions of key stakeholders towards NNTs and explore their knowledge of and compliance with the GG-NNTs. This dataset includes the results of such a questionnaire.
Keywords: agroforestry, alien species, forestry, invasion risk, online survey, ornamental trees, perceptions, stakeholder engagement, sustainability, tree invasions
Published in DiRROS: 08.07.2025; Views: 637; Downloads: 549
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8. First record of the non-native Cnestus mutilatus (Blandford) and further findings of other Xyleborini (Curculionidae, Scolytinae) recently recorded in SloveniaTine Hauptman, Luka Capuder, Zina Devetak, Maarten De Groot, Massimo Faccoli, Barbara Piškur, 2025, original scientific article Abstract: Ambrosia beetles of the subfamily Scolytinae (Coleoptera: Curculionidae) have successfully invaded many parts of the world and are increasingly being introduced to new areas, primarily through international trade. The number of non-native species recorded in Slovenia is also increasing. During the national survey of quarantine species in 2024, a new non-native scolytine beetle, Cnestus mutilatus, was recorded for the first time in Slovenia. Two specimens were trapped at Radmožanci, a location in northeastern Slovenia. New data on two other species recently recorded in Slovenia, Anisandrus maiche and Xylosandrus compactus, are also presented.
Keywords: ambrosia beetles, biological invasions, forest, invasive alien species, trapping
Published in DiRROS: 30.06.2025; Views: 730; Downloads: 710
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9. Managing invasive alien species in forest corridors and stepping stonesGiuseppe Brundu, Maarten De Groot, Sabrina Kumschick, Jan Pergl, Katharina Lapin, 2025, independent scientific component part or a chapter in a monograph Abstract: Invasive alien species (IAS) pose a signiicant threat to forest ecosystems by disrupting ecological networks and competing with native species. Forest habitat patches and corridors designed to enhance connectivity and biodiversity can unintentionally promote the dispersal of IAS, further compromising the ecological integrity of the forest ecosystem. This chapter discusses two main aspects related to IAS and forest connectivity: (1) the spread of IAS in the landscape and their impacts on native species and (2) the consequences of IAS on forest connectivity. Effective management of IAS is crucial to improve connectivity for native species while restricting the spread opportunity for aliens and preserve biodiversity. Ideally, a site-speciic risk analysis should precede conservation or restoration efforts, determining the potential impact of IAS on the respective habitat patch’s structural and functional connectivity, and vice versa. Furthermore, this chapter explores management strategies to control IAS, including physical removal, biological control, and monitoring. Citizen involvement and remote sensing play vital roles in supporting management actions, IAS detection and long-term monitoring, and habitat connectivity. Including stakeholders such as forest owners and managers in such actions ensures a collaborative approach to safeguarding forest ecosystems from the threats posed by IAS.
Keywords: forest health, invasive alien species
Published in DiRROS: 09.06.2025; Views: 798; Downloads: 482
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10. Global Impacts Dataset of Invasive Alien Species (GIDIAS)Sven Bacher, Ellen Ryan-Colton, Mario Coiro, Phillip Cassey, Bella S. Galil, Martin A. Nuñez, Michael Ansong, Katharina Dehnen-Schmutz, Georgi Fayvush, Romina D. Fernandez, Maarten De Groot, 2025, original scientific article Abstract: Invasive alien species are a major driver of global change, impacting biodiversity, ecosystem services, and human livelihoods. To document these impacts, we present the Global Impacts Dataset of Invasive Alien Species (GIDIAS), a dataset on the positive, negative and neutral impacts of invasive alien species on nature, nature’s contributions to people, and good quality of life. This dataset arises from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services’ (IPBES) thematic assessment report of this topic. Data were compiled from published sources, including grey literature, reporting a direct observation of an invasive alien species’ impact. All impact records contain up to 52 fields of contextual information and attempt to link impacts to the global standard “environmental impact classification for alien taxa” (EICAT) and “socio-economic impact classification for alien taxa” (SEICAT). GIDIAS includes more than 22000 records of impacts caused by 3353 invasive alien species (plants, vertebrates, invertebrates, microorganisms) from all continents and realms (terrestrial, freshwater, marine), extracted from over 6700 sources. We intend GIDIAS to be a global resource for investigating and managing the variety of impacts of invasive alien species across taxa and regions.
Keywords: invasive alien species
Published in DiRROS: 02.06.2025; Views: 803; Downloads: 495
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