Bill As I said to begin with I am not a specialest on Plankton and I am glad people that know more than I do are around. In the Book it said that Figure was derived from over 130 different species or clones at different temperaturs (the way I read it). Anyway I found the online PDF version of where I got that Chart from for you. Thanks
http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Nano/Eppley72.pdf