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Updated: Aug 26, 2025

Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer

Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer

Published on: November 12, 2021

An experimental study on post-mortem dissolution and overgrowth processes affecting coccolith assemblages: A rapid

Katarína Holcová¹, Filip Scheiner^1,2

¹Institute of Geology and Palaeontology, Charles University, Praha, Czech Republic.

|October 11, 2022

Summary

This summary is machine-generated.

pH changes significantly impact coccolith preservation and morphology, affecting calcareous nannoplankton assemblage composition and identification. Bacteria and sediment type also influence these post-mortem alterations.

Keywords:

coccolith abundance coccolith corrosion coccolith overgrowths dissolution-resistant taxa pH fluctuations

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Area of Science:

Paleoceanography
Micropaleontology
Geochemistry

Background:

Coccolith dissolution and morphological changes are critical for interpreting past environments and taxonomy.
Understanding post-mortem alterations is essential for accurate fossil record analysis.

Purpose of the Study:

To investigate the effects of pH oscillations on coccolith morphology and calcareous nannoplankton assemblages.
To assess the influence of bacteria and sediment type on these post-mortem changes.

Main Methods:

Experimental manipulation of pH in three sediment types (chalk, marl, ooze) with and without bacteria.
Gradual pH decrease (8.3-6.4) using carbonic acid (H2CO3) and subsequent pH rise via degassing.
Microscopic analysis of coccolith morphology, overgrowth, and assemblage composition.

Main Results:

pH oscillations, bacterial presence, sediment mineralogy, and protective substrates significantly influence coccolith corrosion and overgrowth.
Altered coccolith morphologies and overgrowths change the relative abundances of nannoplankton taxa.
Extreme pH changes can lead to unidentifiable coccoliths and their absence in the fossil record.

Conclusions:

Coccolith preservation and morphology are sensitive to environmental conditions, particularly pH and microbial activity.
Post-mortem alterations complicate taxonomic identification and require careful consideration in paleoenvironmental reconstructions.
The interplay of factors like pH, sediment type, and bacteria dictates the fidelity of the calcareous nannoplankton fossil record.