Iteroparous

Definition

Characterized by multiple reproductive cycles over a lifetime; reproducing in two or more separate events rather than a single terminal episode. In arthropods, iteroparity is common in long-lived species such as tarantulas, scorpions, and many beetles, whereas short-lived insects like mayflies and some cicadas are typically semelparous. The distinction between continuous iteroparity (breeding year-round in favorable conditions) and seasonal iteroparity (discrete breeding seasons) is often ecologically significant.

Etymology

From Latin iterum 'again, a second time' + parere 'to bear, bring forth'

Example

Female wolf spiders (Lycosidae) are iteroparous, producing multiple egg sacs across successive seasons, each requiring a new bout of mate search or sperm storage, in contrast to the semelparous Pacific salmon or many periodical cicadas that reproduce once and die.

Synonyms

• polycarpic (botanical parallel)

Related Terms

• Semelparous
• reproductive strategy
• Life history
• oviparity
• ovoviviparity
• r/K selection theory
• Fecundity

Usage Notes

Applied to individuals, populations, or species as a life-history descriptor. Contrasts absolutely with semelparous; no intermediate state exists in formal usage. Some authors reserve 'iteroparous' for cases with more than two reproductive events, using 'biparous' for exactly two, but this distinction is not universal. In entomology, the term helps explain trade-offs between parental survival and offspring number: iteroparous species often exhibit lower per-bout fecundity but greater lifetime reproductive success and adult survival investment.