Mini-Winkler extractors composed by a mesh bag filled with sifted sample inside and a cotton bag outside. In response to the drying, the ants migrate from the suspended sample and fall into a container partially filled with alcohol at the bottom of the bag.

  
  Part of: Fernandes I, de Souza J (2018) Dataset of long-term monitoring of ground-dwelling ants (Hymenoptera: Formicidae) in the influence areas of a hydroelectric power plant on the Madeira River in the Amazon Basin. Biodiversity Data Journal 6: e24375. https://doi.org/10.3897/BDJ.6.e24375