Practice question

Iteroparity spreads reproductive effort across many breeding events and is usually favored when adults have a reasonable chance of surviving between seasons. A long-lived organism can reproduce repeatedly without paying the extreme one-time cost associated with semelparity, while also buffering failure in any single year. Calling it energy-efficient is shorthand for allocating resources over time, not a claim that repeated breeding has no energetic cost. Life-history traits should be interpreted as correlated tendencies rather than rigid packages. Adult survival, juvenile mortality, body size, development time, fecundity, and parental investment interact. The central reasoning is evolutionary allocation: selection favors the schedule that maximizes lifetime reproductive success within a particular environment, even when that schedule reduces survival or reproduction at another stage. This reasoning also explains why field observations may be approximate even when the underlying textbook classification is useful. This interpretation connects individual-level processes with measurable changes in survival, reproduction, recruitment, or abundance across the population.