Hierarchical agglomerative clustering of the answers given by the participants, with Ward method. The symbol represents the level of participation in the project (never participated - ▲, participate occasionally - ● participate regularly - ★, participate a lot - ◆).

  Part of: Tiago P, Gouveia MJ, Capinha C, Santos-Reis M, Pereira HM (2017) The influence of motivational factors on the frequency of participation in citizen science activities. Nature Conservation 18: 61-78. https://doi.org/10.3897/natureconservation.18.13429