Functional diversity: a review on freshwater fish research Author Gomes, Louise C. Pós Graduação em Biologia Comparada, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020 - 900 Maringá, PR, Brazil. (LCG) louise-cristina @ hotmail. com (corresponding author). Author Dias, Rosa M. PNPD / CAPES, Programa de Pós Graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020 - 900 Maringá, PR, Brazil. (RMD) rmdias. ictio @ gmail. com. rmdias.ictio@gmail.com Author Ruaro, Renata Programa de Pós-Graduação em Ciência e Tecnologia Ambiental, Universidade Tecnológica Federal do Paraná, 81280 - 340 Curitiba, PR, Brazil. (RR) renataruaro _ @ hotmail. com. renataruaro_@hotmail.com Author Benedito, Evanilde Laboratório de Ecologia Energética, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020 - 900 Maringá, PR, Brazil. (EB) eva @ nupelia. uem. br. eva@nupelia.uem.br text Neotropical Ichthyology 2023 e 230022 2023-07-10 21 2 1 16 http://dx.doi.org/10.1590/1982-0224-2023-0022 journal article 10.1590/1982-0224-2023-0022 1982-0224 13349362

TABLE 1 | Extracted data from the articles, description of the classification and application for each topic analyzed.

Extracted data	Classification	Application
a) Year of publication	1945–2021	Used to determine the temporal trend of publications.
b) Biogeographic realm	Palearctic, Nearctic, Neotropical, Indomalayan, Australian, Afrotropical, and Global (when the study assessed more than one region).	Used to identify the distribution of research effort among biogeographic realms.
c) Freshwater environment	River, Stream, Lake, Reservoir, Floodplain, and several (when the study assessed more than one environment). 1) Biological invasion; 2) Climate change; 3) Conservation; 4) Environmental factors; 5) Environmental filtering; 6) Flood pulse; 7) Functional	Used to verify the type of freshwater ecosystem most assessed.
d) General background	structure; 8) Habitat heterogeneity; 9) Impoundments; 10) Land use; 11) Lateral connectivity; 12) Methodological; 13) Multiple stressors; 14) Taxonomic and functional patterns	Classification based on the main objectives of the studies.
e) Functional trait	Ecological traits; morphological traits	Classification based on the type of trait measure. Used to identify the traits most applied to assess functional diversity.
f) Functional category	Feeding; Habitat use; Life History; Locomotion; and Physiology (Classified according to Villéger et al., 2017).	Identify which functional category with the greatest number of traits evaluated.
g) Functional diversity index	All indices found in the reviewed studies.	Used to identify the main index applied to quantify the functional diversity of fish.