Final answer:
Semelparity, which refers to organisms reproducing only once before dying, is not a post-copulatory reproductive strategy like monogamy, polygamy, or promiscuity, but a life-history strategy.
Step-by-step explanation:
The question is asking to identify which of the options listed is NOT a post-copulatory reproductive strategy. Reproductive strategies are behaviors or adaptations that organisms use to increase their chances of successful reproduction. Monogamy, polygamy, and promiscuity are all social mating systems that influence the pattern of mating and genetic diversity. On the other hand, semelparity is a life-history strategy referring to organisms that reproduce only once during their lifetime before dying, such as the Chinook salmon. Therefore, semelparity is not a mating system but rather a pattern of reproductive events in an organism's life. This contrasts with iteroparity, where a species can have multiple reproductive episodes over their lifetime.