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Age-specific life history of sexual and asexual clones of pond-dwelling Daphnia. Solid lines and filled symbols represent cyclically parthenogenetic (sexual) clones, and dashed lines and open symbols represent obligately asexual clones. Clones are D. pulex, except TRE, which is D. obtusa. Survivorship and intrinsic value are proportions that range from 1.0 to 0.0. Per-capita fecundity is given as offspring per female per day.
