Isabel Sauermilch, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, Australia, Joanne M Whittaker, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia, Peter Bijl, Utrecht University, Utrecht, Netherlands, Jennifer Totterdell, Geoscience Australia, Canberra, Australia and Wilfried Jokat, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany