Environmental drivers of size changes in lower Jurassic Schizosphaerella spp
Research output: Contribution to journal › Journal article › Research › peer-review
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.
Original language | English |
---|---|
Article number | 102053 |
Journal | Marine Micropaleontology |
Volume | 168 |
Number of pages | 20 |
ISSN | 0377-8398 |
DOIs | |
Publication status | Published - Sep 2021 |
Bibliographical note
Publisher Copyright:
© 2021
- Biometric study, Calcareous nannofossils, Multivariate statistics, Paris Basin, Sancerre-Couy, Stable isotopes
Research areas
ID: 285318647