Semelparous

Definition

Reproducing only once in a lifetime before death; characterized by a single reproductive episode with no subsequent cycles. In arthropods, semelparity often involves massive resource allocation to reproduction, followed by rapid senescence and death. Contrasts with iteroparity (multiple reproductive cycles).

Etymology

From Latin semel 'once' + parere 'to bring forth, produce'

Example

Periodical cicadas (Magicicada spp.) are classic semelparous insects: after 13 or 17 years of subterranean development, adults emerge synchronously, mate, lay eggs, and die within weeks, leaving no survivors to reproduce again.

Synonyms

• monocarpic (botany)

Related Terms

• Iteroparous
• Big-bang reproduction
• Progenesis
• Reproductive effort
• r-selection

Usage Notes

Applied to individuals, populations, or species. In entomology, semelparity is common in short-lived adults of holometabolous insects and some arachnids with terminal reproduction. Not all semelparous organisms die immediately after reproduction; some may persist briefly. The term emphasizes the life-history strategy, not merely the number of offspring.