Molybdenum (Mo) and uranium (U) isotopes in ancient sediments have become powerful redox-sensitive proxies that can track global marine anoxia including the proportion of sediment buried in anoxic versus oxic settings in the oceans. Both systems build on the same two fundamental attributes: 1) ...
Our approach to address this long-standing enigma is to re-examine the history of life on Earth. It is widely accepted that this began by 3800 Ma and that complex multicellular heterotrophs (animals) did not evolve until after 1000 Ma. Ward and Brownlee2note “Over and over again the same...
The expansion of dead zones was arguably an efficient kill mechanism during several of the most devastating animal crises in Earth history, including during the Cambrian6,7. When anoxia impinges on the seafloor, it changes the behavior of redox sensitive elements and leads to trace metal ...
2004). In our previous studies, we identified evidence for anoxia and for water-mass denitrification and sulfate reduction on the relatively deep slope/basin along the continental margin, prior to the extinction (Fig. 1c; Isozaki et al. 2008; Saitoh et al. 2013a, 2013b, 2014a). Here, ...
planktonic ciliates Anna Gimmler1, Ralf Korn2,3, Colomban de Vargas4,5, Stéphane Audic4,5 & Thorsten Stoeck1 Illumina reads of the SSU-rDNA-V9 region obtained from the circumglobal Tara Oceans expedition allow the investigation of protistan plankton diversity patterns on a global ...