Practice question

Selection in frequently disturbed or short-lived habitats favors rapid maturation and high early reproductive output because delaying reproduction risks dying before breeding. Semelparity can fit this strategy when one large reproductive effort maximizes offspring production under low adult survival. Rapid development is therefore consistent with the classical r-selected end of the continuum, while large body size and repeated, carefully supported breeding are more often linked with K selection. Survivorship and reproductive schedules are connected through allocation. An organism has finite energy for growth, maintenance, defense, and reproduction; investment in one function constrains the others. Natural selection does not pursue a universal ideal. It favors combinations that leave more surviving descendants under the mortality risks and resource patterns experienced by a population. The decisive distinction is therefore between a descriptive label and the demographic mechanism that generates it. Interpreting the example at the appropriate population scale keeps the causal mechanism distinct from a simple correlation or an absolute rule.