In search of a perfect trait set: a workflow presentation based on the conservation status assessment of Poland’s dendroflora

We prepared a list of 387 woody species occurring in Poland based on a literature review to include the whole dendroflora, accounting for trees, shrubs, and subshrubs. Subsequently, we verified all the species names using the GBIF and The Plant List. Then, we compiled trait data by joining TRY and BIEN data.Then we completed as much missing data (mostly categoric) as possible, searching for information in botanical handbooks, identification keys, and red lists of endangered species. After assessing the conservation status of the species studied using the Red List and the Red Book of Ferns and Vascular Plants in Poland (Kaźmierczakowa et al., 2014, 2016), we considered 36 species (i.e., 9.3% of all the species studied) to be threatened. As some part of trait values were still missing and we did not want to exclude less represented species, we have performed data imputation based on correlations among traits and between traits and phylogeny.