For more details on these results, plus results on ageing in the reproductive rate, see the paper. All data and files for the analyses are also published and openly available on Figshare: (7/7)

Global warming is certainly a challenge for many ectotherms, and reduced fitness will likely occur with rising mean temperatures. However, this reduction in fitness may often be due to other causes than increased ageing (for example increased mortality in early life). (6/7)

Our results for the daphnia suggest that observing increased rates of ageing of ectotherms in warmer environments is not necessarily a sign of stress or reduced population viability. Further research is needed to tell whether this is a common pattern across ectotherms. (5/7)

In addition, clonal lines with stronger ageing often showed higher fitness (long-term population growth rate) and net reproductive rate, calculated by matrix population models. (4/7)

When comparing the strength of ageing (shape; the relative increase in mortality hazard over one mean lifespan) on the same intrinsic timescale (pace; units of mean lifespan), temperature did not have consistent effects among the clonal lines. (3/7)

While temperature consistently increased the rate of ageing in mortality (slope in the attached figure), it had different effects on the baseline mortality (intercept) and thereby on mean lifespan in different clonal lines. (2/7)