Background Variability in the ecological impacts of invasive species across their
geographical ranges may decrease the accuracy of risk assessments. Comparative …

Background The spatial distribution of mangrove crabs has been commonly associated with
tree zonation and abiotic factors such as ground temperature and soil granulometry …

The size of sexually selected weapons and their performance in battle are both critical to
reproductive success, yet these traits are often in opposition. Bigger weapons make better …

Highlights•Sexual dimorphism and combat in the wētā, Pachyrhamma waitomoensis, is
described.•We used field methods and morphometrics to investigate fighting and …

Highlights•Male sheet-web spider jaws are substantially longer than those of
females.•These jaws are disproportionately large in larger males.•The first description of …

Interactions between male stag beetles usually involve aggressive behavior using their long
mandibles as weapons to compete with rival males over females. Considerable variation …

Invasive species can have profound ecological and evolutionary impacts on native fauna,
particularly those from overlapping guilds. Intraguild predation and competition often occur …

Individuals often display a preference for one side of their body during aggressive
encounters. This may be a lateralized preference for using one structure of a bilateral trait …

Male–male competition is considered a mechanism for sexual selection and the evolution of
sexual dimorphism in many animals. There are two types of male–male competition …

The Chinese mitten crab, Eriocheir sinensis (H. Milne Edwards, 1853), is a widespread
aquatic species that is native to eastern Asia (Zhao et al., 1988; Sui et al., 2011). Because of …