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| Qin, B.; Li, T.; Xiong, Z.; Algeo, T. J.; Jia, Q.. |
| We present a new deep‐water carbonate ion concentration ([CO32–]) record, reconstructed from the “size‐normalized weight” (SNW) of the planktonic foraminifer Neogloboquadrina dutertrei in core MD06‐3047B, representing a mid‐depth site (2.5 km) in the western tropical Pacific since 700 ka. On glacial‐interglacial timescales, deep‐water [CO32–] exhibits an inverse relationship with global sea‐level elevations, consistent with the “coral reef hypothesis” that the deep Pacific carbonate system responded to variations in shelf‐carbonate production through the past 700 kyr. On longer timescales, a decoupling between deep‐water [CO32–] and δ13C around the globe can be explained by a combination of continental weathering and nutrient inputs. During the mid‐Brunhes... |
| Tipo: Text |
Palavras-chave: Planktonic foraminifer; Shell weight; Carbonate dissolution; Coral reef hypothesis; Carbon cycles; Ocean stratification. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00455/56619/58322.pdf |
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| Shaked, Yonathan; De Vargas, Colomban. |
| We present large subunit (LSU) and internal transcribed spacer (ITS) rDNA based phylogenies of symbiotic dinoflagellates retrieved from single-cell planktonic foraminifera collected around the world. All modern foraminiferal species involved in such symbiosis are included in our analyses. The pelagic symbiotic dinoflagellates form a monophyletic group sister to the Symbiodinium species complex found in coastal-benthic environments. The pelagic symbionts are descendants of free-living species and, together with the coastal-benthic Symbiodinium spp., they originated from the early Mesozoic suessiacean family represented by the extant Polarella glacialis. Out of hundreds of single planktonic foraminifera examined, 21 unique pelagic symbiont ribotypes were... |
| Tipo: Text |
Palavras-chave: Symbiosis; Planktonic foraminifer; Dinoflagellate; Open ocean; Suessiales. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00383/49440/49907.pdf |
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| Voelker, A. H. L.; De Abreu, L.; Schoenfeld, J.; Erlenkeuser, H.; Abrantes, F.. |
| The surface water hydrography along the western Iberian margin, as part of the North Atlantic's eastern boundary upwelling system, consists of a complex, seasonally variable system of equatorward and poleward surface and subsurface currents and seasonal upwelling. Not much information exists to ascertain if the modern current and productivity patterns subsisted under glacial climate conditions, such as during marine isotope stage (MIS) 2, and how North Atlantic meltwater events, especially Heinrich events, affected them. To help answer these questions we are combining stable isotope records of surface to subsurface dwelling planktonic foraminifer species with sea surface temperature and export productivity data for four cores distributed along the western... |
| Tipo: Text |
Palavras-chave: Iberian margin; Last Glacial Maximum; Heinrich events; Planktonic foraminifer; Stable isotopes; Productivity. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00218/32906/31419.pdf |
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