Christina Schmidt, University of New South Wales, Climate Change Research Centre, ARC Australian Centre for Excellence in Antarctic Science, Sydney, NSW, Australia, Adele K Morrison, Australian National University and Australian Centre for Excellence in Antarctic Science, Canberra, ACT, Australia, Matthew H England, Univ New South Wales, Sydney, NSW, Australia and Alessandro Silvano, University of Tasmania, Quantitative Marine Science Program, Hobart, TAS, Australia