alien_plant_ro

Study Extent

Romania

Sampling

Two survey methods were used: low-intensity survey and high-intensity survey. For the low-intensity survey, the survey of alien plant species was carried out in randomly selected grids of 100 sqkm. Within these grids, botanists randomly selected transects that were 50 km long and up to 50 m in width, with a sampling station at each 10 km (i.e., five sampling stations on each transect). In the case of high-intensity surveys, the survey was carried out in 100 sqm sampling plots located in randomly preselected areas. Occurrence data were collected in survey forms alongside photos for habitat and species identification. Specimens posing difficulty in on-site identification were collected for further examination and identification in the lab. Database curation was carried out by experienced botanists and biogeographers (authors of the paper).

Method steps

1. Information regarding the occurrence records of alien plant species included in the database was collected between 2019-2022. The species taxonomy considered in the present paper is based on GBIF Backbone Taxonomy. The data were transferred to ArcGIS Pro and visually inspected for errors. The analysis were performed in ArcGIS Pro.

All alien plant species were identified to kingdom, phylum, class, order, family, genus, species, infraspecificEpithet, taxon rank

1. Magnoliopsida
   rank: class
2. Liliopsida
   rank: class
3. Pinopsida
   rank: class
4. Polypodiopsida
   rank: class

The database include 396 alien plant species from Romania, Europe