Semelparity

Definition

Semelparity is a reproductive strategy where an organism reproduces only once in its lifetime, often in a single, large reproductive event. After reproduction, the organism typically dies, investing all its energy into the single reproductive effort.

5 Must Know Facts For Your Next Test

1. Semelparous organisms often produce a large number of offspring in one reproductive event to maximize their chances of passing on genes.
2. Examples of semelparous organisms include many species of insects, annual plants, and some fish like salmon.
3. Semelparity is advantageous in environments where survival rates are low or unpredictable for both adults and offspring.
4. This strategy contrasts with iteroparity, where organisms reproduce multiple times over their lifespan.
5. Environmental cues such as seasonal changes or resource availability can trigger the reproductive event in semelparous species.

Review Questions

• What are some examples of semelparous organisms?
• How does semelparity differ from iteroparity?
• What environmental conditions might favor a semelparous reproductive strategy?

Related terms

Iteroparity:

A reproductive strategy where an organism reproduces multiple times throughout its life.

Life History Strategy: The overall pattern in average timing and nature of life history events, shaped by natural selection.

R-Selected Species: Species that produce many offspring but provide little parental care, often associated with high mortality rates among young.