Table 1. Classification of sounds recorded from the Araguaian river dolphin at the Mocajuba fish market based on the presence of non-linear phenomena and duration.

Vocalization type	Number of sounds produced
Long two-component calls—pulsed calls longer than 0.200s, with biphonation as the most marking characteristic, may exhibit subharmonics	12
Long calls with subharmonics—calls longer than 0.200s, may exhibit biphonation	1
Short two-component calls—pulsed calls shorter than 0.200s, with biphonation as the most marking characteristic, may exhibit subharmonics	538
Short calls—signals shorter than 0.200s with no non-linear phenomena	53
Short calls with subharmonics—calls shorter than 0.200s, may exhibit biphonation	102
Whistles—tonal narrow-banded signals longer than 0.100s, may exhibit harmonics	21
Total	727