Stabilizing selection is a fundamental concept in evolutionary biology. In the presence of a
single intermediate optimum phenotype (fitness peak) on the fitness surface, stabilizing …

Mate choice may impose both linear (ie, directional) and nonlinear (ie, quadratic and
correlational) sexual selection on advertisement traits. Traditionally, mate recognition and …

The intensity of a signal is crucial for animal communication because a high signal-to-noise
ratio improves signal reception. However, variation in amplitude may also have signalling …

Geographic variation of traits may represent the first step for evolutionary divergence
potentially leading to speciation. Signals are behavioral traits of particular interest for the …

Airborne sound and substrate vibrations are communication channels inextricably linked
through commonalities in signal production, propagation, and reception. Bimodal recordings …

Sound amplitude (measured as sound pressure level) is an acoustical parameter that has
received little attention within communication research, especially in mammals. Although …

The aim of this study was to investigate how information about the affective state is
expressed in vocalizations. Alarm calls can serve as model systems with which to study this …

Abstract Background White-handed gibbons (Hylobates lar) are small Asian apes known for
living in stable territories and producing loud, elaborate vocalizations (songs), often in well …

Most alternative reproductive phenotypes are interpreted as alternative tactics within a
conditional strategy: all individuals are predicted to choose among behavioral tactics based …

Phenotypic variation is ubiquitous in nature and a precondition for adaptive evolution.
However, theory predicts that the extent of phenotypic variation should decrease with …