Long-distance calls in Neotropical primates.

Area of Science:

• Primate communication
• Bioacoustics
• Animal behavior

Background:

• Long-distance calls are common in primates, but studies often focus on limited species.
• These vocalizations share acoustic features for sound propagation.
• Functions are broadly categorized as extragroup (defense, attraction) or intragroup (coordination, alarm).

Purpose of the Study:

• To explore general trends in primate long-distance calls across the order.
• To investigate the functional diversity of these calls, particularly in Neotropical primates.
• To highlight the complexity and potential underestimation of female call importance.

Main Methods:

• Comparative analysis of existing literature on primate vocalizations.
• Categorization of call functions based on behavioral contexts (extragroup vs. intragroup).
• Examination of specific examples from Neotropical primate species like atelines, callitrichids, titi monkeys, and howler monkeys.

Main Results:

• Neotropical primates utilize long-distance calls for intragroup coordination (atelines) and intergroup contests (callitrichids).
• Examples include titi monkey duets and howler monkey roars/barks for extragroup functions.
• Complex call repertoires exist, with potentially significant roles for female calls in non-duetting species.

Conclusions:

• Primate long-distance calls exhibit diverse functions, from intragroup coordination to intergroup spacing and defense.
• There is considerable variation in call complexity and importance across species and sexes.
• Future research should address evolutionary patterns, phylogenetic relationships of call repertoires, and form-function links.