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Romanian Carpathians are considered a biodiversity hotspot in Europe, with large forested areas, including old-growth forests. Past forestry practices, such as selective logging resulting in forest high grading and removal of ancient or decaying trees, reduced the heterogeneity of forest structure and composition. These practices led to forest habitats with few veteran trees and a small amount of deadwood, which protected saproxylic beetles rely on for completing their complex life cycles. Moreover, saproxylic species are considered pest species under traditional forestry practices, as they reduce the value of timber. As such, Romanian forestry practices have actively sought to reduce the amount of deadwood in an effort to decrease the presence of saproxylic species, thus effectively isolating stands with a high diversity of saproxylic beetles. The European Commission will finance the project LIFE19 NAT/RO/000023 Conservation of saproxylic beetles in the Carpathians LIFE ROsalia. The project aims to stop and reverse the loss of protected saproxylic beetles (Rosalia longicorn Rosalia alpina, the hermit beetle Osmoderma eremita, great capricorn beetle Cerambyx cerdo, grey beetle Morimus funereus, and stag beetle Lucanus cervus) in the Carpathians by demonstrating conservation actions for increasing the connectivity of favorable habitats in the ROSCI0208 Putna-Vrancea (Eastern Carpathians, Romania), and transferring and replicating best management practices in other Romanian Natura 2000 sites. LIFE ROsalia will be implemented between 2020 and 2025 by the Environmental Protection Agency Vrancea, the Center for Environmental Research at the University of Bucharest, the Putna-Vrancea Natural Park Administration, and the Association for Biodiversity Conservation. [ABSTRACT FROM AUTHOR]

Background: Biological invasions pose an increasing risk to nature, social security and the economy, being ranked amongst the top five threats to biodiversity. Managing alien and invasive species is a priority for the European Union, as outlined in the EU Biodiversity Strategy for 2030 and the Kunming-Montreal Global Biodiversity Framework. Alien plant species are acknowledged to impact the economy and biodiversity; thus, analysing the distribution of such species provides valuable inputs for the management and decision-making processes. The database presented in the current study is the first consolidated checklist of alien plant species that are present in Romania, both of European Union concern and of national interest. This database complements a prior published distribution, based only on records from literature, bringing new information regarding the occurrence of alien plants in Romania, as revealed by a nationwide field survey. We consider this database a valuable instrument for managing biological invasions at both national and regional levels, as it can be utilised in further research studies and in drafting management and action plans, assisting stakeholders in making informed decisions and implementing management actions., New Information: We present the results of the first nationwide survey of alien plant species in Romania, conducted between 2019 and 2022, in the framework of a national project coordinated by the Ministry of Environment, Waters and Forests and the University of Bucharest. The present database complements and updates the database published by Sirbu et. al (2022), which included occurrence records published until 2019. The new database includes 98323 occurrence records for 396 alien plant species in 77 families, with most species belonging to the Asteraceae family. One alien plant species in our database, the black locust Robiniapseudoacacia L., had more than 10,000 occurrence records. The distribution database also includes information on newly-reported invasive alien plant species of European Union concern in Romania (i.e. the floating primrose-willow Ludwigiapeploides (Kunth) P.H.Raven) and documents the presence of plants in 44 additional families compared to Sirbu et al. (2022). Each entry includes information on species taxonomy, location, year, person who recorded and identified the alien plant, geographical coordinates and taxon rank., (Paulina Anastasiu, Iulia V Miu, Athanasios A Gavrilidis, Cristina Preda, Laurentiu Rozylowicz, Culita Sirbu, Adrian Oprea, Mihaela Urziceanu, Petronela Camen-Comanescu, Eugenia Nagoda, Daniyar Memedemin, Marius Barbos, Violeta Boruz, Alina Cislariu, Ioan Don, Marius Fagaras, Jozsef Pal Frink, Ioana Mihaela Georgescu, Ovidiu Ioan Haruta, Bogdan-Iuliu Hurdu, Attila Matis, Sretco Milanovici, Sorana Muncaciu, Alina Georgeta Neacsu, Monica Neblea, Alma Lioara Nicolin, Mariana Niculescu, Silvia Oroian, Oliviu Grigore Pop, Daniel I Radutoiu, Mihaela Samarghitan, Ioana Simion, Liliana Cristina Soare, Corina Steiu, Emilia Stoianov, Daniela Strat, Anna Szabo, Paul Marian Szatmari, Corneliu Tanase, Marian D Mirea, Nicolae Manta, Ioana M Sirbu.)