| Titre | Tracking the rise of eukaryotes to ecological dominance with zinc isotopes |
| |
| Auteur | Isson, T T; Love, G D; Dupont, C L; Reinhard, C T; Zumberge, A J; Asael, D; Gueguen, B; McCrow, J; Gill, B C; Owens, J; Rainbird, R H ; Rooney, A D; Zhao, M -Y; Stueeken, E E; Konhauser, K O; John, S G; Lyons, T W; Planavsky, N J |
| Source | Geobiology vol. 16, 4, 2018 p. 341-352, https://doi.org/10.1111/gbi.12289  Accès ouvert |
| Année | 2018 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20182332 |
| Éditeur | Wiley |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1111/gbi.12289 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Diffusé | 2018 06 05 |
| Résumé | (disponible en anglais seulement)
The biogeochemical cycling of zinc (Zn) is intimately coupled with organic carbon in the ocean. Based on an extensive new sedimentary Zn isotope record across
Earth's history, we provide evidence for a fundamental shift in the marine Zn cycle ~800 million years ago. We discuss a wide range of potential drivers for this transition and propose that, within available constraints, a restructuring of marine
ecosystems is the most parsimonious explanation for this shift. Using a global isotope mass balance approach, we show that a change in the organic Zn/C ratio is required to account for observed Zn isotope trends through time. Given the higher
affinity of eukaryotes for Zn relative to prokaryotes, we suggest that a shift toward a more eukaryote-rich ecosystem could have provided a means of more efficiently sequestering organic-derived Zn. Despite the much earlier appearance of eukaryotes
in the microfossil record (~1700 to 1600 million years ago), our data suggest a delayed rise to ecological prominence during the Neoproterozoic, consistent with the currently accepted organic biomarker records. |
| GEOSCAN ID | 310908 |
|
|