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Pseudo-cryptic speciation in coccolithophores.

Alberto G Saez1, Ian Probert, Markus Geisen

  • 1Alfred Wegener Institute for Polar and Marine Biology, Department of Biological Oceanography, Am Handelshafen 12, D-27570 Bremerhaven, Germany. a.saez@imperial.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|May 22, 2003
PubMed
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Fine scale variations in coccoliths, the calcite plates of unicellular algae, likely represent distinct species that evolved millions of years ago. This finding enhances understanding of coccolithophore evolution and paleoceanography.

Area of Science:

  • Marine biology
  • Paleontology
  • Evolutionary biology

Background:

  • Coccolithophores are crucial calcifying unicellular algae impacting oceanic primary productivity and the global carbon cycle.
  • Their taxonomy relies on coccolith morphology, but fine-scale variations' significance remains unclear, questioning phenotypic plasticity versus genetic divergence.
  • Coccoliths are also vital biostratigraphic marker fossils in paleoceanographic studies.

Purpose of the Study:

  • To investigate the biological and taxonomic significance of fine-scale morphological variations in coccoliths.
  • To test the hypothesis that these variations represent pseudocryptic speciation events.
  • To assess the implications for coccolithophore taxonomy, evolutionary history, and biostratigraphic applications.

Main Methods:

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  • Molecular clock estimations were applied to five common coccolithophore species.
  • Analysis focused on the divergence times of pseudocryptic speciation events suggested by morphological variations.
  • Morphological data of coccoliths were analyzed to understand evolutionary patterns.

Main Results:

  • Evidence supports the hypothesis that fine-scale coccolith variations represent pseudocryptic speciation events.
  • Estimated speciation events occurred between 0.3 and 12.9 million years ago, indicating significant evolutionary divergence.
  • Strong stabilizing selection appears to act on coccolithophore phenotypes, maintaining distinct morphological traits.

Conclusions:

  • Fine-scale coccolith morphology is a reliable indicator of distinct, evolutionarily significant lineages (species).
  • These findings enhance the resolution of biostratigraphy and paleoceanographic data retrieval from the fossil record.
  • Understanding coccolithophore evolution through pseudocryptic speciation provides insights into marine microbial ecology and past ocean conditions.