The bird community demonstrated greater acoustic activity during the
day, mainly during the dawn chorus, with few species singing during
the night. Primates were especially vocal early in the morning. Insect
specieswere estimated to be higher in thewet season and, in particular,
during the night. Bat calls were detected only at night. The richness of
species was found to be higher: (1) during the wet season on both
sites; (2) during the day in both seasons and sites; and (3) on the site
far from the mine, especially during the wet season.
Insect species that were detected only at the site far from the mine
presented stridulations with significantly larger bandwidth, and higher
maximumand minimumfrequencies than species that occurred only at
the site close to themine. The opposite occurred with bird species. Species
recorded close to the mine presented significantly larger bandwidth,
and higher maximum and minimum frequencies than species
recorded at the site far from the mine (Table 5).