The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species
| Autor: | Xavier Crosta, Oscar E Romero, Jean-Jacques Pichon, Leanne K. Armand |
|---|---|
| Přispěvatelé: | UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Universität Bremen, University of Tasmania [Hobart, Australia] (UTAS) |
| Rok vydání: | 2005 |
| Předmět: |
010506 paleontology
010504 meteorology & atmospheric sciences POOZ Biogeography Oceanography 01 natural sciences Sediments Sea ice 14. Life underwater Southern Ocean [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bacillariophyceae geography geography.geographical_feature_category biology Paleontology Sediment Diatom Pelagic zone Plankton biology.organism_classification Habitat [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Thermohaline circulation Geology |
| Zdroj: | Palaeogeography, Palaeoclimatology, Palaeoecology Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2005, 223 (1-2), pp.66-92. ⟨10.1016/j.palaeo.2005.03.028⟩ |
| ISSN: | 0031-0182 |
| Popis: | International audience; Diatom assemblages from 228 core-top samples were investigated to determine the modern geographic distributions of 10 major open ocean species or species groups in the Atlantic and Indian sectors of the Southern Ocean. Our study gives a more comprehensive view of the relationships between diatom distribution and environmental pressures than previous studies, as our modern database covers a much wider area, and additionally highlights the relationships with sea ice cover and concentration. The 10 species or species categories can mainly be lumped into three groupings. First, a cool open ocean grouping composed of Rhizosolenia pointed group, Thalassiosira gracilis group and Trichotoxon reinboldii with maximum relative abundances occurring within the maximum winter sea-ice edge. Second, a pelagic open ocean grouping composed of Fragilariopsis kerguelensis, Thalassiosira lentiginosa, Thalassiosira oliverana and Thalassiothrix spp. group with maximum occurrences at the Antarctic Polar Front. Third, a warm open ocean grouping with maximum abundances observed within the Polar Front Zone and composed of the Rhizosolenia rounded group, the Thalassionema nitzschioides var. nitzschioides group and the Thalassionema nitzschioides var. lanceolata. Comparisons of the abovementioned 10 species or species groups with modern February sea-surface temperatures and sea-ice duration and concentration reveal species-specific sedimentary distributions regulated both by sea-surface temperatures and sea ice conditions that support the use of diatom remains to reconstruct past variations of these environmental parameters via qualitative and transfer function approaches. |
| Databáze: | OpenAIRE |
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