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| Kender, Sev; Mcclymont, Erin L.; Elmore, Aurora C.; Emanuele, Dario; Leng, Melanie J.; Elderfield, Henry. |
| Understanding the interaction between climate and biotic evolution is crucial for deciphering the sensitivity of life. An enigmatic mass extinction occurred in the deep oceans during the Mid Pleistocene, with a loss of over 100 species (20%) of sea floor calcareous foraminifera. An evolutionarily conservative group, benthic foraminifera often comprise 450% of eukaryote biomass on the deep-ocean floor. Here we test extinction hypotheses (temperature, corrosiveness and productivity) in the Tasman Sea, using geochemistry and micropalaeontology, and find evidence from several globally distributed sites that the extinction was caused by a change in phytoplankton food source. Coccolithophore evolution may have enhanced the seasonal 'bloom' nature of primary... |
| Tipo: Text |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00496/60723/65259.pdf |
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| Schiraldi, Benedetto, Jr.; Sikes, Elisabeth L.; Elmore, Aurora C.; Cook, Mea S.; Rose, Kathryn A.. |
| This study examined sources of mixed layer and shallow subsurface waters in the subtropical Bay of Plenty, New Zealand, across the last deglaciation (similar to 30-5 ka). delta O-18 and delta C-13 from planktonic foraminifera Globgerinoides bulloides and Globorotalia inflata in four sediment cores were used to reconstruct surface mixed layer thickness, delta O-18 of seawater (delta O-18(SW)) and differentiate between high-and low-latitude water provenance. During the last glaciation, depleted planktonic delta O-18(SW) and enriched delta C-13 (-0.4-0.1 parts per thousand) indicate surface waters had Southern Ocean sources. A rapid delta C-13 depletion of similar to 1 parts per thousand in G. bulloides between 20 and 19 ka indicates an early, permanent shift... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40132/39242.pdf |
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