title: Arsenic stress after the Proterozoic glaciations.
abstract: Protection against arsenic damage in organisms positioned deep in the tree of life points to early evolutionary sensitization. Here, marine sedimentary records reveal a Proterozoic arsenic concentration patterned to glacial-interglacial ages. The low glacial and high interglacial sedimentary arsenic concentrations, suggest deteriorating habitable marine conditions may have coincided with atmospheric oxygen decline after ~2.1 billion years ago. A similar intensification of near continental margin sedimentary arsenic levels after the Cryogenian glaciations is also associated with amplified continental weathering. However, interpreted atmospheric oxygen increase at this time, suggests that the marine biosphere had widely adapted to the reorganization of global marine elemental cycles by glaciations. Such a glacially induced biogeochemical bridge would have produced physiologically robust communities that enabled increased oxygenation of the ocean-atmosphere system and the radiation of the complex Ediacaran-Cambrian life.
authors.affiliation: Stockholm University, Department of Geological Sciences and Bolin Centre for Climate Research, SE-106 91, Stockholm, Sweden.|Nordic Centre for Earth Evolution, Swedish Museum of Natural History, Department of Paleobiology Box 50007, SE-104 05, Stockholm, Sweden.
authors.forename: Ernest Chi
authors.initials: EC
authors.lastname: Fru
authors.affiliation: Nordic Centre for Earth Evolution, Swedish Museum of Natural History, Department of Paleobiology Box 50007, SE-104 05, Stockholm, Sweden.|Uppsala University, Department of Earth Sciences, Paleobiology, SE-752 36, Uppsala, Sweden.
authors.forename: Emma
authors.initials: E
authors.lastname: Arvestål
authors.affiliation: Stockholm University, Department of Geological Sciences and Bolin Centre for Climate Research, SE-106 91, Stockholm, Sweden.
authors.forename: Nolwenn
authors.initials: N
authors.lastname: Callac
authors.affiliation: Université de Poitiers UMR 7285-CNRS, Institut de Chimie des Milieux et Matériaux de Poitiers-5, rue Albert Turpin (Bât B35) 86073 Poitiers cedex.
authors.forename: Abderrazak
authors.initials: A
authors.lastname: El Albani
authors.affiliation: Department of Economic Geology and Geochemistry Faculty of Geology and Geoenvironment, University of Athens Panepistimiopolis Zographou 157 84 Athens, Greece.
authors.forename: Stephanos
authors.initials: S
authors.lastname: Kilias
authors.affiliation: Department of Economic Geology and Geochemistry Faculty of Geology and Geoenvironment, University of Athens Panepistimiopolis Zographou 157 84 Athens, Greece.
authors.forename: Ariadne
authors.initials: A
authors.lastname: Argyraki
authors.affiliation: Stockholm University, Department of Geological Sciences and Bolin Centre for Climate Research, SE-106 91, Stockholm, Sweden.
authors.forename: Martin
authors.initials: M
authors.lastname: Jakobsson
mesh_terms: D001151:Arsenic / Q000737:chemistry / Q000302:isolation & purification*; D001272:Atmosphere; D005075:Biological Evolution; D019015:Geologic Sediments / Q000737:chemistry*; D046448:Ice Cover; D009792:Oceans and Seas; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011827:Radiation; D012623:Seawater / Q000737:chemistry
chemical_list: D001151:Arsenic; D010100:Oxygen