Semelparity

Semelparity contrasts with iteroparity, where organisms reproduce repeatedly and tend to show more gradual senescence. Semelparous organisms reproduce once, often at a fixed age, and usually die soon afterward. The results argue that semelparity alone does not determine when or how abruptly senescence occurs. The simulations model semelparity by fixing reproduction at age R rather than allowing repeated reproduction after maturity. Each semelparous parent produces offspring only during a single reproduction event.