Abstract
Fourteen life-history traits were measured at 15, 24, and 30°C for three obligately asexual ( Artemia parthenogenetica Bowen) and three sexual (two A. tunisiana Bowen and one A. franciscana Kellogg) populations. Data were also collected on the A. franciscana population at 27.5 and 32.5°C. A. tunisiana was least tolerant to high temperatures, while A. parthenogenetica had a broader tolerance. A. franciscana showed the widest tolerance range. Trade-offs between performance at low and high temperatures were found, especially for sexual populations. No single population performed best at all temperatures. Female lifespan, but not the pre-reproductive and reproductive periods, were linearly related to temperature. For five populations, the reproductive period constituted a smaller portion of lifespan as temperature deviated from 24°C. Low interpopulational variability was found for female lifespan and pre-reproductive period, with high levels for reproductive period and offspring production. The results are relevant to the relative merits of sexually and asexually reproducing populations and their possible competitive interactions.
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