Correlated evolution between body size and echolocation in bats (order Chiroptera).

Area of Science:

• * Evolutionary Biology
• * Bioacoustics
• * Mammalogy

Background:

• * Established relationship between body size and echolocation call frequencies in bats.
• * Uncertainty regarding the universality of this allometry across the bat clade.
• * Need to investigate scaling patterns for other echolocation parameters like bandwidth and duration, and their evolutionary coupling with body mass.

Purpose of the Study:

• * To test the allometric scaling of peak frequency, bandwidth, and call duration with body mass in 314 bat species.
• * To determine if these scaling patterns differ between nasal and oral echolocating bats.
• * To investigate the correlated evolution between body mass and echolocation parameters throughout bat evolution using Bayesian statistics.

Main Methods:

• * Phylogenetically informed analyses of 314 bat species.
• * Statistical testing of allometric scaling for peak frequency, bandwidth, and call duration against body mass.
• * Application of Bayesian statistical techniques with large-scale simulations to assess correlated evolution.

Main Results:

• * Significant allometric patterns observed for echolocation peak frequencies, bandwidth, and duration in both nasal and oral emitters.
• * Coupled changes in these echolocation traits observed during laryngeal echolocator diversification.
• * Body mass showed stronger relationships with peak frequency and call duration than with bandwidth.

Conclusions:

• * Body size significantly influences multiple echolocation parameters in bats.
• * Bayesian statistical methods are valuable for studying macroevolutionary patterns and trait coevolution.
• * Findings provide insights into the mechanisms linking bat size and echolocation.