Trade-off in reproduction is between:
Life-history theory emphasizes a trade-off between current reproductive effort and future reproduction. Energy devoted now to gametes, offspring, courtship, or care cannot also support growth, repair, immune defense, and survival to later breeding. Increasing present output may therefore reduce the number or quality of future offspring, while restrained investment can preserve residual reproductive value. Semelparity and iteroparity describe timing, whereas fecundity describes output. Long juvenile development can occur with either strategy. Ecologists therefore examine complete schedules of s
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 5