Final answer:
Sibling rivalry in behavioural ecology is exemplified by intraspecific competition where siblings compete for resources such as food and parental care, which can influence survival, reproductive success, and lead to character displacement.
Step-by-step explanation:
An example of sibling rivalry in behavioural ecology can be seen in intraspecific competition. This occurs when members of the same species, such as siblings, compete for the same resources. A real-world instance of this is observed in many bird species where siblings might contest for parental attention and food, leading to aggressive interactions. Another example could emerge from a study of certain ungulate species, where siblings might vie for dominance and access to better grazing areas within a territory.
Intraspecific competition is a form of competition that significantly influences evolutionary processes, as it can lead to the development of different character traits to reduce direct competition, a phenomenon known as character displacement. Moreover, it can have an impact on individual survival and reproductive success, ultimately shaping population dynamics and species distribution within an ecosystem.