Extinction of austral diatoms in response to large-scale climate dynamics in Antarctica
| Autor: | Dominic A. Hodgson, Allan C. Ashworth, Margaret A. Harper, Elie Verleyen, Alexander P. Wolfe, Bart Van de Vijver, Eveline Pinseel, A. R. Lewis, Dermot Antoniades, Koen Sabbe, Luc Ector, Wim Vyverman, Bianca B. Perren |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
NEW-ZEALAND medicine.disease_cause 010603 evolutionary biology 01 natural sciences HILLS HISTORY parasitic diseases Paleoclimatology medicine FRESH-WATER DIATOMS 14. Life underwater Endemism Biology Multidisciplinary Extinction EAST ANTARCTICA 010604 marine biology & hydrobiology fungi Climate dynamics Biology and Life Sciences Protist 15. Life on land SALINE LAKES Geography Oceanography PATTERNS LARSEMANN COMMUNITIES Engineering sciences. Technology TASMANIAN HIGHLAND LAKES BIOGEOGRAPHY |
| Zdroj: | SCIENCE ADVANCES Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Despite evidence for microbial endemism, an understanding of the impact of geological and paleoclimate events on the evolution of regional protist communities remains elusive. Here, we provide insights into the biogeographical history of Antarctic freshwater diatoms, using lacustrine fossils from mid-Miocene and Quaternary Antarctica, and dovetail this dataset with a global inventory of modern freshwater diatom communities. We reveal the existence of a diverse mid-Miocene diatom flora bearing similarities with several former Gondwanan landmasses. Miocene cooling and Plio-Pleistocene glaciations triggered multiple extinction waves, resulting in the selective depauperation of this flora. Although extinction dominated, in situ speciation and new colonizations ultimately shaped the species-poor, yet highly adapted and largely endemic, modern Antarctic diatom flora. Our results provide a more holistic view on the scale of biodiversity turnover in Neogene and Pleistocene Antarctica than the fragmentary perspective offered by macrofossils and underscore the sensitivity of lacustrine microbiota to large-scale climate perturbations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|