Susan Anne Wijffels, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Beatriz Pena-Molino, CSIRO Hobart, Centre for Southern Hemisphere Ocean Research, Hobart, TAS, Australia, Bernadette Sloyan, CSIRO Oceans and Atmosphere, Hobart, TAS, Australia and Craig Raymond Steinberg, Australian Institute of Marine Science, Townsville, QLD, Australia