In the behavior of subordinate male long-tailed manakins assisting dominant males, what evolutionary aspect is highlighted?

The behavior of subordinate male long-tailed manakins assisting dominant males primarily highlights the evolutionary aspect of inheritance of territory and mating opportunities upon the dominant male's death. In this social structure, subordinate males are not merely helping their dominant counterparts; they are positioning themselves for future reproductive success. When the dominant male dies, one of the subordinate males is likely to take his place and inherit the territory, leading to increased access to females.

This behavior reflects a strategy in which subordinate males gain indirect benefits by ensuring that they are well-placed to take over once an opportunity arises. In terms of evolutionary biology, such social dynamics can enhance the fitness of these subordinate males, as they increase their chances of reproducing without the direct competition of other dominant males during the time they are assisting. The focus is not solely on cooperative breeding or mutual benefit among unrelated males but rather on the strategic accumulation of advantages leading to future dominance and breeding rights. Therefore, the act of assisting is a means of securing future reproductive success within a structured hierarchy.