Results 181 to 190 of about 1,954 (223)

Paleoproductivity: The benthic/planktonic ratio in foraminifera as a productivity index

Marine Geology, 1988
Abstract When the effects of differential dissolution are excluded, the benthic to planktonic ratio in deep-sea foraminifera can be read as a productivity index. For pelagic conditions we use the BZ index, which is the product of the benthic/planktonic ratio in percent, and the depth of deposition (which controls supply of organic matter).
W.H Berger, L Diester-Haass
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Tracers of ocean paleoproductivity and paleochemistry: An introduction

Paleoceanography, 1990
New developments in ocean paleoproductivity and paleochemistry have involved the application of tracers that record seawater composition, that document sedimentary fluxes, and that may be used to infer oceanic processes. These include the use of Cd/Ca and Ba/Ca ratios in benthic foraminifera, rare earth element patterns of chemical sediments, uranium ...
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Deep-sea sedimentation and paleoproductivity in the Paleogene of a Tethyan basin

GFF, 2000
(2000). Deep-sea sedimentation and paleoproductivity in the Paleogene of a Tethyan basin. GFF: Vol. 122, No. 1, pp. 44-45.
Hans Egger, Mandana Homayoun, Fred Roegl
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Paleoproductivity of the Indian Ocean during the Tertiary Period

Global and Planetary Change, 1995
Abstract Studies of oceanic paleoproductivity have lagged in part because of the absence of a suitable proxy for measuring paleoproductivity. A transfer function has recently been proposed which directly translates carbonate mass accumulation rates into a quantitative measure of productivity. This transfer function ha been applied at six ODP sites in
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Biogenic Barium as a Proxy for Paleoproductivity: Methods and Limitations of Application

1999
The obvious link between sedimentary barium and past and present ocean productivity has propagated numerous studies on this tracer in the past years. In this paper a summary is given on what is known of the generation of the barium signal and its link to the flux of organic carbon.
F. X. Gingele, M. Zabel, S. Kasten, W. J. Bonn, C. C. Nürnberg   +4 more
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Relationship between phytoplankton paleoproduction and diversity in contrasting trophic states

Aquatic Ecosystem Health & Management, 2008
With the increasing rate of species extinctions following anthropogenic perturbation, there is a growing interest in biodiversity research. Although productivity and species richness relationships have been tested and applied in contemporary aquatic ecological studies, none have been applied to paleoecology with contrasting trophic states.
Biplob Das, Rick Nordin, Asit Mazumder
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Paleoproductivity and organic matter sources in Late Quaternary Lake Ontario

Palaeogeography, Palaeoclimatology, Palaeoecology, 2015
Abstract We have examined δ 13 C of ostracode valves and clam shells, carbon and nitrogen mass accumulation rates (C- and N-MAR), atomic C/N and δ 13 C OM from Lake Ontario since ~ 16,000 cal BP to evaluate the impacts of the Laurentide Ice Sheet (LIS) and regional paleohydrology on primary lacustrine productivity and sources of OM. Samples were
Ryan Hladyniuk, Fred J. Longstaffe
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Does volcanism promote or suppress paleoproductivity?

Goldschmidt2022 abstracts, 2022
Yuping Zhou, Yong Li
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Downcore diagenetic changes in organic matter and implications for paleoproductivity estimates

Global and Planetary Change, 2006
Abstract Particulate amino acid (AA) content of a 41.85 m long IMAGES core (MD01-2379), collected in 560 m water depth offshore from Northwest Australia, was analyzed to study organic matter (OM) degradation and preservation through glacial–interglacial intervals.
Lallan P. Gupta, Hodaka Kawahata
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Faunal perspectives on paleoproductivity

Marine Micropaleontology, 2000
F.J. Jorissen, E.J. Rohling
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