a) Different types of literature sources stored in the Polytraits database; b) Origin of the information in the Polytraits database. Most information is contained in books and review papers, whereas on average, a single research paper contains little information. Graph based on data in Suppl. material 4 and Suppl. material 5.

  
  Part of: Faulwetter S, Markantonatou V, Pavloudi C, Papageorgiou N, Keklikoglou K, Chatzinikolaou E, Pafilis E, Chatzigeorgiou G, Vasileiadou K, Dailianis T, Fanini L, Koulouri P, Arvanitidis C (2014) Polytraits: A database on biological traits of marine polychaetes. Biodiversity Data Journal 2: e1024. https://doi.org/10.3897/BDJ.2.e1024