Stable-isotope studies of planktonic foraminifera in North Atlantic core tops

1981 ◽  
Vol 33 (1-3) ◽  
pp. 157-172 ◽  
Author(s):  
Joseph T. Durazzi
Keyword(s):  
Stable Isotope ◽  
North Atlantic ◽  
Planktonic Foraminifera ◽  
Isotope Studies ◽  
Atlantic Core

Depth-habitat reorganization of planktonic foraminifera across the Albian/Cenomanian boundary

Paleobiology ◽  
2010 ◽  
Vol 36 (3) ◽  
pp. 357-373 ◽  
Author(s):  
Atsushi Ando ◽  
Brian T. Huber ◽  
Kenneth G. MacLeod
Keyword(s):  
Stable Isotope ◽  
North Atlantic ◽  
Planktonic Foraminifera ◽  
Environmental Parameters ◽  
Implicit Assumption ◽  
Ocean Stratification ◽  
Evolutionary Changes ◽  
Surface Dwelling ◽  
Cooling Trend ◽  
Species Specific

New mid-Cretaceous stable isotope (δ18O and δ13C) records of multiple planktonic foraminiferal species and coexisting coccoliths from Blake Nose (western North Atlantic) document a major depth-ecology reorganization of planktonic foraminifera. Across the Albian/Cenomanian boundary, deep-dwellingPraeglobotruncana stephaniandRotalipora globotruncanoidesadapted to living at a shallower depth, while, at the same time, the population of surface-dwellingParacostellagerina libycadeclined. Subsequently, the opportunistic speciesHedbergella delrioensisshifted to a deep environment, and the deep-dwelling formsRotalipora montsalvensisandRotalipora reichelifirst appeared. The primary paleoenvironmental cause of the observed changes in planktonic adaptive strategies is uncertain, yet their coincidence with an earliest Cenomanian cooling trend reported elsewhere implicates the importance of reduced upper-ocean stratification. Although there has been an implicit assumption that the species-specific depth habitats of fossil planktonic foraminifera were invariant through time, planktonic paleoecology is a potential variable. Accordingly, the possibility of evolutionary changes in planktonic foraminiferal depth ecology should be a primary consideration (along with other environmental parameters) in paleoceanographic interpretations of foraminiferal stable isotope data.

scholarly journals Variability in Neogloboquadrina pachyderma stable isotope ratios from isothermal conditions: implications for individual foraminifera analysis

2021 ◽  
Author(s):  
Lukas Jonkers ◽  
Geert-Jan A. Brummer ◽  
Julie Meilland ◽  
Jeroen Groeneveld ◽  
Michal Kucera
Keyword(s):  
Stable Isotope ◽  
North Atlantic ◽  
Environmental Variability ◽  
Seasonal Pattern ◽  
Planktonic Foraminifera ◽  
Population Level ◽  
Excess Noise ◽  
Neogloboquadrina Pachyderma ◽  
Stable Isotope Data ◽  
Δ18o And Δ13c

Abstract. Individual foraminifera analysis (IFA) holds promise to reconstruct seasonal to interannual oceanographic variability. Even though planktonic foraminifera are reliable recorders of environmental conditions on a population level, whether they also are on the level of individuals is unknown. Yet, one of the main assumptions underlying IFA is that each specimen records ocean conditions with negligible noise. Here we test this assumption using stable isotope data measured on groups of four shells of Neogloboquadrina pachyderma from a 16–19 days resolution sediment trap time series from the subpolar North Atlantic. We find a within-sample variability of 0.11 and 0.10 ‰ for δ18O and δ13C respectively that show no seasonal pattern and exceed water column variability in spring when conditions are homogeneous down to 100s of metres. We assess the possible effect of life cycle characteristics and delay due to settling on foraminifera δ18O variability with simulations using temperature and δ18Oseawater as input. These simulations indicate that the observed δ18O variability can partially be explained by environmental variability. Individual N. pachyderma are thus imperfect recorders of temperature and δ18Oseawater. We estimate the excess noise on δ18O to be 0.11 ± 0.06 ‰. The origin and nature of the recording imprecision require further work, but our analyses highlight the need to take such excess noise into account when interpreting the geochemical variability among individual foraminifera.

Stable isotope studies in the Salitroso Lake Basin (southern Patagonia, Argentina): assessing diet of Late Holocene hunter-gatherers

2009 ◽  
Vol 19 (2) ◽  
pp. 297-308 ◽  
Author(s):  
A. Tessone ◽  
A. F. Zangrando ◽  
G. Barrientos ◽  
R. Goñi ◽  
H. Panarello ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Late Holocene ◽  
Lake Basin ◽  
Hunter Gatherers ◽  
Southern Patagonia ◽  
Isotope Studies

Effects of development on techniques for calcium stable isotope studies in children

1994 ◽  
Vol 23 (6) ◽  
pp. 357-361 ◽  
Author(s):  
Kimberly O. O'Brien ◽  
Steven A. Abrams
Keyword(s):  
Stable Isotope ◽  
Isotope Studies

scholarly journals Present-Day Radiocarbon Content of Select Flavoring Compounds Reveals Vanillin Production Pathway

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1819-1826 ◽  
Author(s):  
Randy Culp ◽  
G V Ravi Prasad
Keyword(s):  
Stable Isotope ◽  
Fossil Fuel ◽  
Agricultural Products ◽  
Clove Oil ◽  
Isotopic Data ◽  
Established Method ◽  
New Methods ◽  
Isotopic Methods ◽  
Isotope Studies ◽  
The University

Radiocarbon and stable isotope determination in foods, flavors, and beverages, for the authentication of source material and process of formation, is a well-established method of identity used in industry. New methods of provenance determination, using stable isotopes of oxygen and hydrogen, have added to the host of other isotopic methods used for characterizing natural or botanically derived products. The unambiguous determinant of a product's fossil fuel origin be it from petroleum, natural gas, or coal, is through the measurement of its 14C content. The 14C content can also be used to determine the fraction dilution of recently grown and harvested material with that derived from fossil fuel, and even confirms the vintage of agricultural products based on the well-established decrease of bomb-produced atmospheric 14C. This paper documents 14C measurements at the University of Georgia's Center for Applied Isotope Studies accelerator mass spectrometry and stable isotope laboratories, over the last 3 yr, for 10 important flavoring compounds. By establishing an accurate and current level of 14C in botanically derived products, we were able to confirm a particular source for vanilla production, the most popular consumer flavor in the marketplace. Over the years, vanilla extract has been produced less and less from vanilla beans (Vanilla planifolia), particularly those from Madagascar and the Comoros Islands, and more from other botanical precursors such as ferulic acid, clove oil, and guaiacol. We report isotopic data to support this precursor for vanilla production based on high 14C levels accumulated during the tree's life, incorporated in the tree rings and their associated stable isotope abundances.

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