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Impact of trace metal concentrations on coccolithophore growth and morphology: laboratory simulations of Cretaceous stress
Citation
Faucher, G and Hoffmann, L and Bach, LT and Bottini, C and Erba, E and Riebesell, U, Impact of trace metal concentrations on coccolithophore growth and morphology: laboratory simulations of Cretaceous stress, Biogeosciences, 14 pp. 3603-3613. ISSN 1726-4170 (2017) [Refereed Article]
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Copyright Statement
Copyright 2017 the authors. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/
DOI: doi:10.5194/bg-14-3603-2017
Abstract
The Cretaceous ocean witnessed intervals of profound perturbations such as volcanic input of large amounts of CO2, anoxia, eutrophication and introduction of biologically relevant metals. Some of these extreme events were characterized by size reduction and/or morphological changes of a few calcareous nannofossil species. The correspondence between intervals of high trace metal concentrations and coccolith dwarfism suggests a negative effect of these elements on nannoplankton biocalcification processes in past oceans. In order to test this hypothesis, we explored the potential effect of a mixture of trace metals on growth and morphology of four living coccolithophore species, namely Emiliania huxleyi, Gephyrocapsa oceanica, Pleurochrysis carterae and Coccolithus pelagicus. The phylogenetic history of coccolithophores shows that the selected living species are linked to Mesozoic species showing dwarfism under excess metal concentrations. The trace metals tested were chosen to simulate the environmental stress identified in the geological record and upon known trace metal interactions with living coccolithophore algae.
Our laboratory experiments demonstrated that elevated trace metal concentrations, similarly to the fossil record, affect coccolithophore algae size and/or weight. Smaller coccoliths were detected in E. huxleyi and C. pelagicus, while coccoliths of G. oceanica showed a decrease in size only at the highest trace metal concentrations. P. carterae coccolith size was unresponsive to changing trace metal concentrations. These differences among species allow discriminating the most- (P. carterae), intermediate- (E. huxleyi and G. oceanica) and least-tolerant (C. pelagicus) taxa. The fossil record and the experimental results converge on a selective response of coccolithophores to metal availability.
These species-specific differences must be considered before morphological features of coccoliths are used to reconstruct paleo-chemical conditions.
Our laboratory experiments demonstrated that elevated trace metal concentrations, similarly to the fossil record, affect coccolithophore algae size and/or weight. Smaller coccoliths were detected in E. huxleyi and C. pelagicus, while coccoliths of G. oceanica showed a decrease in size only at the highest trace metal concentrations. P. carterae coccolith size was unresponsive to changing trace metal concentrations. These differences among species allow discriminating the most- (P. carterae), intermediate- (E. huxleyi and G. oceanica) and least-tolerant (C. pelagicus) taxa. The fossil record and the experimental results converge on a selective response of coccolithophores to metal availability.
These species-specific differences must be considered before morphological features of coccoliths are used to reconstruct paleo-chemical conditions.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | coccolithophore, phytoplankton, paleo |
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Biological oceanography |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the earth sciences |
| UTAS Author: | Bach, LT (Dr Lennart Bach) |
| ID Code: | 133667 |
| Year Published: | 2017 |
| Web of Science® Times Cited: | 14 |
| Deposited By: | Ecology and Biodiversity |
| Deposited On: | 2019-07-05 |
| Last Modified: | 2019-08-12 |
| Downloads: | 7 View Download Statistics |
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