Environmental drivers of size changes in lower Jurassic Schizosphaerella spp
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Environmental drivers of size changes in lower Jurassic Schizosphaerella spp. / Peti, Leonie; Thibault, Nicolas; Korte, Christoph; Ullmann, Clemens V.; Cachão, Mario; Fibæk, Marie.
I: Marine Micropaleontology, Bind 168, 102053, 09.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Environmental drivers of size changes in lower Jurassic Schizosphaerella spp
AU - Peti, Leonie
AU - Thibault, Nicolas
AU - Korte, Christoph
AU - Ullmann, Clemens V.
AU - Cachão, Mario
AU - Fibæk, Marie
N1 - Publisher Copyright: © 2021
PY - 2021/9
Y1 - 2021/9
N2 - The Early Jurassic nannofossil Schizosphaerella has displayed major changes in its mean valve size through time. These variations are investigated in detail in the Sinemurian to lowermost Toarcian of the Sancerre-Couy core (Paris Basin), based on previously published measurements of 7050 specimens. Through multivariate morphon analysis and mixture analysis, we decipher three distinct overlapping varieties of Schizosphaerella (small, medium, large) and show that mean size changes of this taxon can be mostly related to variations in the relative abundance of these three varieties. Comparison to facies changes and to newly and previously acquired geochemical data (bulk carbonate C and O isotopes and organic C isotopes, %CaCO3 and TOC) suggest that, whilst sea-surface temperature was indeed an important driver of size changes in Schizosphaerella, it is insufficient on its own to explain the full variability of our dataset. Likewise, sea-level controlled proximal-distal variations and levels of nutrient supply were additional drivers of Schizosphaerella size changes. The small population of Schizosphaerella remains, however, a good indicator for warmer episodes.
AB - The Early Jurassic nannofossil Schizosphaerella has displayed major changes in its mean valve size through time. These variations are investigated in detail in the Sinemurian to lowermost Toarcian of the Sancerre-Couy core (Paris Basin), based on previously published measurements of 7050 specimens. Through multivariate morphon analysis and mixture analysis, we decipher three distinct overlapping varieties of Schizosphaerella (small, medium, large) and show that mean size changes of this taxon can be mostly related to variations in the relative abundance of these three varieties. Comparison to facies changes and to newly and previously acquired geochemical data (bulk carbonate C and O isotopes and organic C isotopes, %CaCO3 and TOC) suggest that, whilst sea-surface temperature was indeed an important driver of size changes in Schizosphaerella, it is insufficient on its own to explain the full variability of our dataset. Likewise, sea-level controlled proximal-distal variations and levels of nutrient supply were additional drivers of Schizosphaerella size changes. The small population of Schizosphaerella remains, however, a good indicator for warmer episodes.
KW - Biometric study
KW - Calcareous nannofossils
KW - Multivariate statistics
KW - Paris Basin
KW - Sancerre-Couy
KW - Stable isotopes
U2 - 10.1016/j.marmicro.2021.102053
DO - 10.1016/j.marmicro.2021.102053
M3 - Journal article
AN - SCOPUS:85117230081
VL - 168
JO - Marine Micropaleontology
JF - Marine Micropaleontology
SN - 0377-8398
M1 - 102053
ER -
ID: 285318647