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Technical note: The silicon isotopic composition of choanoflagellates: implications for a mechanistic understanding of isotopic fractionation during biosilicification

Authors: Marron, Alan; Cassarino, Lucie; Hatton, Jade; Curnow, Paul; Hendry, Katharine R.;

Technical note: The silicon isotopic composition of choanoflagellates: implications for a mechanistic understanding of isotopic fractionation during biosilicification

Abstract

The marine silicon cycle is intrinsically linked with carbon cycling in the oceans via biological production of silica by a wide range of organisms. The stable silicon isotopic composition (denoted by δ30Si) of siliceous microfossils extracted from sediment cores can be used as an archive of past oceanic silicon cycling. However, the silicon isotopic composition of biogenic silica has only been measured in diatoms, sponges and radiolarians, and isotopic fractionation relative to seawater is entirely unknown for many other silicifiers. Furthermore, the biochemical pathways and mechanisms that determine isotopic fractionation during biosilicification remain poorly understood. Here, we present the first measurements of the silicon isotopic fractionation during biosilicification by loricate choanoflagellates, a group of protists closely related to animals. We cultured two species of choanoflagellates, Diaphanoeca grandis and Stephanoeca diplocostata, which showed consistently greater isotopic fractionation (approximately −5 ‰ to −7 ‰) than cultured diatoms (−0.5 ‰ to −2.1 ‰). Instead, choanoflagellate silicon isotopic fractionation appears to be more similar to sponges grown under similar dissolved silica concentrations. Our results highlight that there is a taxonomic component to silicon isotope fractionation during biosilicification, possibly via a shared or related biochemical transport pathway. These findings have implications for the use of biogenic silica δ30Si produced by different silicifiers as proxies for past oceanic change.

Country
United Kingdom
Subjects by Vocabulary

Microsoft Academic Graph classification: Silicon Dissolved silica chemistry.chemical_element Fractionation Biogenic silica Carbon cycle Isotopes of silicon Choanoflagellate biology biology.organism_classification chemistry Environmental chemistry Seawater

Library of Congress Subject Headings: lcsh:Life lcsh:QH540-549.5 lcsh:QE1-996.5 lcsh:Geology lcsh:QH501-531 lcsh:Ecology

Keywords

Ecology, Evolution, Behavior and Systematics, Earth-Surface Processes

70 references, page 1 of 7

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Funded by
WT
Project
  • Funder: Wellcome Trust (WT)
,
EC| BIOCOMPLEX
Project
BIOCOMPLEX
Physical Aspects of the Evolution of Biological Complexity
  • Funder: European Commission (EC)
  • Project Code: 247333
  • Funding stream: FP7 | SP2 | ERC
sysimport:actionset
,
EC| ICY-LAB
Project
ICY-LAB
Isotope CYcling in the LABrador Sea
  • Funder: European Commission (EC)
  • Project Code: 678371
  • Funding stream: H2020 | ERC | ERC-STG
Validated by funder | sysimport:crosswalk:repository
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European Marine Science
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