Planktic Foraminiferal Assemblages in Surface Sediments From the Subpolar North Atlantic Ocean

Sahoo, Naresh Kumar; Saalim, Syed Mohammad; Matul, A. G.; Mohan, Rahul; Тихонова, Анна; Kozina, N. V.

doi:10.3389/fmars.2021.781675

Cited by 6 publications

(4 citation statements)

References 90 publications

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“…72 Other foraminifer species that have been identified in the sub-Arctic waters in the west to the warm North Atlantic water in the east are Neogloboqudrina pachyderma, Neogloboquadrina incompata and Globorotalia inflata, Globigerina bulloides, Globigerinita glutinata, Globorotalia scitula, and Globigerinita uvula. 73 These species present morphologies highly similar to the biomorphs (Figures 3, 4). Biomorphs are autoorganized systems whose structures with different biological morphologies are not formed by cells but by nanocrystals.…”

Section: Barium and Strontium Biomorphs Adopt The Morphology Of Radio...mentioning

confidence: 67%

“…Among foraminifers are those of the species Turborotalita quinqueloba located in the subpolar North Atlantic, in the Nordic seas, and in the Arctic Ocean . Other foraminifer species that have been identified in the sub-Arctic waters in the west to the warm North Atlantic water in the east are Neogloboqudrina pachyderma, Neogloboquadrina incompata and Globorotalia inflata, Globigerina bulloides, Globigerinita glutinata, Globorotalia scitula, and Globigerinita uvula . These species present morphologies highly similar to the biomorphs (Figures , ).…”

Section: Resultsmentioning

confidence: 99%

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Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Cuéllar‐Cruz

Ramírez-Cardona

Islas

et al. 2022

ACS Earth Space Chem.

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The array of atmospheric and chemical conditions that prevailed during the Precambrian era favored the origin of life in our planet. The minerals and rocks that existed in that era catalyzed the synthesis of the first biomolecules. It has been shown that mineral clays possess the best-suited mineral surface to study the polymerization of protobiomolecules because they catalyze the binding of monomers to form peptides and nucleic acids and foster the binding between them. Inorganic structures exist formed by silica-carbonates of calcium, barium, or strontium, called biomorphs, which emulate the morphological structure of diverse organisms. Some of these morphologies resemble several of the microfossils found in the Precambrian cherts. Notwithstanding, it has not been documented yet whether biomorphs are a consequence of the dissolution of clays in alkaline environments (rich in alkaline earth metals) during the initial stages of the Earth, which would favor the hypothesis that the biomorphs or cherts existed since that time. To know whether biomorphs could have been embedded within minerals or in diverse types of clays and contributed to the synthesis of protobiomolecules, we aimed at synthesizing biomorphs in the presence of different clays of natural origin in two synthesis conditions that resemble both the atmosphere of the Precambrian era and that of the current time, regarding the CO2 concentration. Our results revealed that in the condition emulating the Precambrian, polymorphs of calcite, aragonite, and vaterite were formed. The barium and strontium biomorphs adopted the morphology of radiolarians, diatoms, and foraminifers in this same condition, indicating that they could be the first structure of these organisms. Results also revealed that the clays present in the Precambrian together with the prevailing environmental conditions played a preponderant role as catalyzers in the structural morphology, chemical composition, and crystalline habit adopted by the first organisms. Biomorphs could have been the first inorganic structures with a structural order and characteristic shape (preserving biomolecules in their interior when they were formed) that were synthetized in the early era of our planet, but they have not been dated as a fossil registry.

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Section: Barium and Strontium Biomorphs Adopt The Morphology Of Radio...mentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Cuéllar‐Cruz

Ramírez-Cardona

Islas

et al. 2022

ACS Earth Space Chem.

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“…The concentration of T. quinqueloba, a subpolar water mass indicator at Site 984 [4] and northeastern subpolar gyre [59], seems to loosely covary with the % N. pachyderma, although the relative concentration of the former is insignificant. In any case, the trace of G. inflata, N. incompta, and T. quinqueloba [60][61][62] further support the presence of a prevailing cold climate regardless of the season during MIS 6. Using mostly N. pachyderma and other foraminiferal concentrations at ODP Site 984, Mokeddem and McManus [4] reported three interstadial events centered at 163, 152, and 146 ka within MIS 6 in which only the interstadial event centered at 152 ka exhibits a minor T. quinqueloba rise.…”

Section: Subpolar To Subtropical Water Mass Movement During Mismentioning

confidence: 94%

Micropaleontological and Isotopic Perspective of Surface Water Mass Variability in the NE Atlantic from MIS 6 to 5e (188 to 115 ka)

Rashid,

Chen,

Menke

et al. 2023

Geosciences

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The penultimate glaciation (marine isotope stage (MIS) 6) is considered regionally extreme compared to the last glacial maximum, in which the European ice sheets had a vast areal extent. In contrast to the last deglaciation (19–7 ka), the penultimate deglaciation (140–130 ka) hosts one of the most rapid oceanographic changes of the late Pleistocene. In this study, we reconstructed changes in the near-surface and thermocline in the central to northeast Atlantic by analyzing sediments from two Integrated Ocean Drilling Program Expedition 306 sites. Sites U1313 (41°00.6′ N, 32°57.4′ W) and U1314 (56°21.9′ N, 27°53.3′ W) were drilled on the eastern flank of the mid-Atlantic ridge and Gardar Drift of the eastern subpolar North Atlantic, respectively. We analyzed planktonic foraminiferal assemblages, ice-rafted debris (IRD), and oxygen isotopes in two planktonic foraminifers, Globigerina bulloides, and Globorotalia inflata, from MIS 6 to 5e (185–115 ka). Warmer and colder sea-surface conditions were marked by a change in the relative abundance of polar, subpolar, and transitional planktonic foraminifers. Oxygen isotopes in G. bulloides and G. inflata suggest that the thermocline deepened at the subtropical Site U1313 during MIS 6. The lack of Globorotalia inflata prevented us from profiling the mixed layer and thermocline at the subpolar Site U1314. In contrast to MIS 6, the mixed layer and thermocline were re-stratified during the last interglacial. The lack of major IRD events at both sites suggests the stability of the Laurentide ice sheet during MIS 6 compared to the subsequent glaciation. The presence of Heinrich event 11 indicates the discharge of freshwater that freshened the sea surface, resulting in mixing between the mixed layer and thermocline. Our results were placed into a broader context using published data that shed light on the sensitivity of freshwater discharge to the North Atlantic and the following changes with a transition from a penultimate glacial to an interglacial period in surface circulation.

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“…We combined the ForCenS planktonic foraminifera assemblages sampled in Atlantic Ocean core-top surface sediment samples (Siccha and Kucěra, 2017) with 54 additional samples for the NE Atlantic coastal upwelling systems (Salgueiro et al, 2008;Voelker and Salgueiro, 2017;Salgueiro et al, 2020, represented in the figure as Salgueiro) and 40 samples from the North Atlantic's subpolar gyre (Barrenechea Angeles et al, 2020;Sahoo et al, 2022). This resulted in a total of 1741 samples (Figure 1), which were collected between the 1960's and 2016.…”

Section: Materials and Related Background Informationmentioning

confidence: 99%

Ocean kinetic energy and photosynthetic biomass are important drivers of planktonic foraminifera diversity in the Atlantic Ocean

et al. 2022

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To assess the anthropogenic effect on biodiversity, it is essential to understand the global diversity distribution of the major groups at the base of the food chain, ideally before global warming initiation (1850 Common Era CE). Since organisms in the plankton are highly interconnected and carbonate synthesizing species have a good preservation state in the Atlantic Ocean, the diversity distribution pattern of planktonic foraminifera from 1741 core-top surface sediment samples (expanded ForCenS database) provides a case study to comprehend centennial to decadal time-averaged diversity patterns at pre-1970 CE times, the tempo of the substantial increase in tropospheric warming. In this work, it is hypothesized and tested for the first time, that the large-scale diversity patterns of foraminifera communities are determined by sea surface temperature (SST, representing energy), Chl-a (a surrogate for photosynthetic biomass), and ocean kinetic energy (as EKE). Alpha diversity was estimated using species richness (S), Shannon Wiener index (H), and Simpson evenness (E), and mapped using geostatistical approaches. The three indices are significantly related to SST, Chl-a, and EKE (71-88% of the deviance in the generalized additive mixed model, including a spatial component). Beta diversity was studied through species turnover using gradient forest analysis (59% of the variation). The primary community thresholds of foraminifera species turnover were associated with 5-10 °C and 22-28 °C SST, 0.05-0.15 mg m-3 Chl-a, and 1.2-2.0 cm2 s-2 log10 EKE energy, respectively. Six of the most important foraminifera species identified for the environmental thresholds of beta diversity are also fundamental in transfer functions, further reinforcing the approaches used. The geographic location of the transition between the four main biogeographic zones was redefined based on the results of beta diversity analysis and incorporating the new datasets, identifying the major marine latitudinal gradients, the most important upwelling areas (Benguela Current, Canary Current), the Equatorial divergence, and the subtropical fronts (Gulf Stream-North Atlantic Drift path in the north, and the South Atlantic current in the south). In conclusion, we provide statistical proof that energy (SST), food supply (Chl-a), and currents (EKE) are the main environmental drivers shaping planktonic foraminifera diversity in the Atlantic ocean and define the associated thresholds for species change on those variables.

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Planktic Foraminiferal Assemblages in Surface Sediments From the Subpolar North Atlantic Ocean

Cited by 6 publications

References 90 publications

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Influence of Different Types of Clay Minerals on the Shape and Form of Silica-Carbonates (Biomorphs) of Ca(II), Ba(II), and Sr(II)

Micropaleontological and Isotopic Perspective of Surface Water Mass Variability in the NE Atlantic from MIS 6 to 5e (188 to 115 ka)

Ocean kinetic energy and photosynthetic biomass are important drivers of planktonic foraminifera diversity in the Atlantic Ocean

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