Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography
So-called "vital effects" are a collective term for a suite of physiologically and metabolically induced variability in oxygen (δ 18 O) and carbon (δ 13 C) isotope ratios of planktonic foraminifer shells that hamper precise quantitative reconstruction of past ocean parameters. Correction f...
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ftdoajarticles:oai:doaj.org/article:31d51533caf64402b6682cce6286b512 2023-05-15T17:36:08+02:00 Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography B. Metcalfe W. Feldmeijer M. de Vringer-Picon G.-J. A. Brummer F. J. C. Peeters G. M. Ganssen 2015-08-01T00:00:00Z https://doi.org/10.5194/bg-12-4781-2015 https://doaj.org/article/31d51533caf64402b6682cce6286b512 EN eng Copernicus Publications http://www.biogeosciences.net/12/4781/2015/bg-12-4781-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4781-2015 https://doaj.org/article/31d51533caf64402b6682cce6286b512 Biogeosciences, Vol 12, Iss 15, Pp 4781-4807 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-4781-2015 2022-12-31T02:03:21Z So-called "vital effects" are a collective term for a suite of physiologically and metabolically induced variability in oxygen (δ 18 O) and carbon (δ 13 C) isotope ratios of planktonic foraminifer shells that hamper precise quantitative reconstruction of past ocean parameters. Correction for potential isotopic offsets from equilibrium or the expected value is paramount, as too is the ability to define a comparable life stage for each species that allows for direct comparison. Past research has focused upon finding a specific size range for individual species in lieu of other identifiable features, thus allowing ocean parameters from a particular constant (i.e. a specific depth or season) to be reconstructed. Single-shell isotope analysis of fossil shells from a mid-latitude North Atlantic Ocean piston core covering Termination III (200 to 250 ka) highlight the advantage of using a dynamic size range, i.e. utilising measurements from multiple narrow sieve size fractions spanning a large range of total body sizes, in studies of palaeoclimate. Using this methodology, we show that isotopic offsets between specimens in successive size fractions of Globorotalia inflata and Globorotalia truncatulinoides are not constant over time, contrary to previous findings. For δ 18 O in smaller-sized globorotalids (212–250 μm) it is suggested that the offset from other size fractions may reflect a shallower habitat in an early ontogenetic stage. A reduction in the difference between small and large specimens of G. inflata between insolation minima and maxima is interpreted to relate to a prolonged period of reduced water column stratification. For the shallow-dwelling species Globigerina bulloides , no size–isotope difference between size fractions is observed, and the variability in the oxygen isotopic values is shown to correlate well with the seasonal insolation patterns. As such, patterns in oxygen isotope variability of fossil populations may be used to reconstruct past seasonality changes. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Biogeosciences 12 15 4781 4807 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 B. Metcalfe W. Feldmeijer M. de Vringer-Picon G.-J. A. Brummer F. J. C. Peeters G. M. Ganssen Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
So-called "vital effects" are a collective term for a suite of physiologically and metabolically induced variability in oxygen (δ 18 O) and carbon (δ 13 C) isotope ratios of planktonic foraminifer shells that hamper precise quantitative reconstruction of past ocean parameters. Correction for potential isotopic offsets from equilibrium or the expected value is paramount, as too is the ability to define a comparable life stage for each species that allows for direct comparison. Past research has focused upon finding a specific size range for individual species in lieu of other identifiable features, thus allowing ocean parameters from a particular constant (i.e. a specific depth or season) to be reconstructed. Single-shell isotope analysis of fossil shells from a mid-latitude North Atlantic Ocean piston core covering Termination III (200 to 250 ka) highlight the advantage of using a dynamic size range, i.e. utilising measurements from multiple narrow sieve size fractions spanning a large range of total body sizes, in studies of palaeoclimate. Using this methodology, we show that isotopic offsets between specimens in successive size fractions of Globorotalia inflata and Globorotalia truncatulinoides are not constant over time, contrary to previous findings. For δ 18 O in smaller-sized globorotalids (212–250 μm) it is suggested that the offset from other size fractions may reflect a shallower habitat in an early ontogenetic stage. A reduction in the difference between small and large specimens of G. inflata between insolation minima and maxima is interpreted to relate to a prolonged period of reduced water column stratification. For the shallow-dwelling species Globigerina bulloides , no size–isotope difference between size fractions is observed, and the variability in the oxygen isotopic values is shown to correlate well with the seasonal insolation patterns. As such, patterns in oxygen isotope variability of fossil populations may be used to reconstruct past seasonality changes. |
format |
Article in Journal/Newspaper |
author |
B. Metcalfe W. Feldmeijer M. de Vringer-Picon G.-J. A. Brummer F. J. C. Peeters G. M. Ganssen |
author_facet |
B. Metcalfe W. Feldmeijer M. de Vringer-Picon G.-J. A. Brummer F. J. C. Peeters G. M. Ganssen |
author_sort |
B. Metcalfe |
title |
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
title_short |
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
title_full |
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
title_fullStr |
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
title_full_unstemmed |
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
title_sort |
late pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-4781-2015 https://doaj.org/article/31d51533caf64402b6682cce6286b512 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Biogeosciences, Vol 12, Iss 15, Pp 4781-4807 (2015) |
op_relation |
http://www.biogeosciences.net/12/4781/2015/bg-12-4781-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4781-2015 https://doaj.org/article/31d51533caf64402b6682cce6286b512 |
op_doi |
https://doi.org/10.5194/bg-12-4781-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
15 |
container_start_page |
4781 |
op_container_end_page |
4807 |
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1766135528399306752 |