For the first review, two reviewers looked at this paper and made suggestions on what needed to be changed in order for the paper to be published.

Reviewer 1:
This reviewer believed that parts of the paper completely missed the mark.  They believed that the author made the paper slightly more complicated then it should have been by not explaining all of the terms they used, or using terms in a way that they would not normally be used.  They also believed that there were quite a few words within the paper that the reader had to read between the lines or guess in order to understand. 
This reviewer also believed that there was a lot of awkward sentencing within the paper, that needed to be changed in order for the paper to flow better.
Finally, the reviewer stated that the limitations were not stated.  One of the major limitations that was left out was the temperature limitations.  As this research was done within the lab, there are limitations as to what kind of temperature the water can be.  Also, since there was no heating system set up to heat the tanks, there was limitations to how the water could be heated and to what degree the water could be heated throughout the tank, as the warm water was added by adding in new water instead of just heating the old water.

Reviewer 2:
One of the main problems that this reviewer found was the figures.  For all figures found within the paper the reviewer suggested adding symbols in order to indicate the significant differences found.  They also suggested adding the sample size to all figures, in order to better understand how many of each species of urchin was used.  For figure 6 the reviewer suggested to put both figures on the same axis so that a comparison between both species could be made.
This reviewer also wanted the author to consider whether the fact that Elizabeth Sherman used different urchins each year skewed the data.
Finally this reviewer believed that Elizabeth Sherman needed to further discuss how the seawater temperature variability from year to year may affect the thermal tolerance of the sea urchins.

After both reviewers looked over the paper and made their suggestions, it was decided that Elizabeth Sherman needed to make major changes before the paper would be accepted. 

Information cite: Sherman E.  2015.  Can sea urchins beat the heat? Sea urchins, thermal tolerance, and climate change.  [Cited November 16, 2015].  PeerJ 3:e1006  Available from: http://dx.doi.org/10.7717/peerj.1006

Photo Credit: Red sea urchin.  2015.  Friends of La Jolla Shores: Preserve the reserves.  [Cited November 16, 2015].  Available from: http://friendsoflajollashores.com/marinelife/redseaurchin/