Practice question

Dracaena is treated here as the non-semelparous organism because many species are perennial plants capable of flowering repeatedly. Bamboo, cicadas, and mayflies include familiar examples that invest in a single major reproductive episode or effectively reproduce once before death. Taxonomic names alone can conceal variation, however: semelparity must ultimately be established from the life history of the particular species, not assumed for every member of a genus. The r/K framework is best treated as a continuum. At one end, rapid development and many inexpensive offspring suit transient opportunities; at the other, slower development and greater investment per offspring can improve success near environmental limits. Modern life-history theory tests the underlying trade-offs directly rather than assigning every species to a fixed box. The key idea is the direction of the trade-off or feedback, because that direction determines the population-level outcome. Field evidence should therefore be compared with the model assumptions before extending the conclusion to every species, habitat, or time period.