Environmental change poses challenges to many organisms. The resilience of a species to
such change depends on its ability to respond adaptively. Social flexibility is such an …

Previously, it was widely believed that each species has a specific social organization, but
we know now that many species show intraspecific variation in their social organization …

Lifetime reproductive success (LRS), the number of offspring produced over an organism's
lifetime, is a fundamental component of Darwinian fitness. For taxa such as salmonids with …

In the last few decades, important advances have been made in the knowledge on the
behavioral ecology of pair-living primates such as owl monkeys (Aotus spp.). With the …

In many species, individuals of the same sex exhibit different mating behaviours, a
phenomenon known as alternative mating tactics (AMTs). These AMTs may occur in species …

Studying the association between fitness and cognition in free-living animals is a
fundamental step in the elucidation of the evolution of cognition. We assessed whether …

1. While the reasons for group-living have been studied for decades, little is known about
why individuals become solitary. 2. Several previous experimental studies could …

Alternative reproductive tactics (ARTs) are defined as discrete differences in morphological,
physiological, and/or behavioral traits associated with reproduction that occur within the …

Intraspecific variability in mating systems has been documented previously, but there are
few studies where investigators have used intraspecific comparisons to investigate the …

Paternity protection and the acquisition of multiple mates select for different traits. The
consensus from theoretical work is that mate-guarding intensifies with an increasing male …