The Figure numbers refer to the figures in the below paper:

Busch, D. S., C. Harvey, P. McElhany. 2013. Potential impacts of ocean acidification on the Puget Sound food web. ICES Journal of Marine Science 70(4): 823-833. doi:10.1093/icesjms/fst061

Link to download the paper:
http://dx.doi.org/10.1093/icesjms/fst061