A re-examination of the mechanism of whiting events: A new role for diatoms in Fayetteville Green Lake (New York, USA).
EPS
Whitings
biomineralization
calcite
calcium carbonates
diatoms
micrite
Journal
Geobiology
ISSN: 1472-4669
Titre abrégé: Geobiology
Pays: England
ID NLM: 101185472
Informations de publication
Date de publication:
03 2023
03 2023
Historique:
revised:
24
06
2022
received:
07
05
2021
accepted:
17
10
2022
pubmed:
4
11
2022
medline:
15
2
2023
entrez:
3
11
2022
Statut:
ppublish
Résumé
Whiting events-the episodic precipitation of fine-grained suspended calcium carbonates in the water column-have been documented across a variety of marine and lacustrine environments. Whitings likely are a major source of carbonate muds, a constituent of limestones, and important archives for geochemical proxies of Earth history. While several biological and physical mechanisms have been proposed to explain the onset of these precipitation events, no consensus has been reached thus far. Fayetteville Green Lake (New York, USA) is a meromictic lake that experiences annual whitings. Materials suspended in the water column collected through the whiting season were characterized using scanning electron microscopy and scanning transmission X-ray microscopy. Whitings in Fayetteville Green Lake are initiated in the spring within the top few meters of the water column, by precipitation of fine amorphous calcium carbonate (ACC) phases nucleating on microbial cells, as well as on abundant extracellular polymeric substances (EPS) frequently associated with centric diatoms. Whiting particles found in the summer consist of 5-7 μm calcite grains forming aggregates with diatoms and EPS. Simple calculations demonstrate that calcite particles continuously grow over several days, then sink quickly through the water column. In the late summer, partial calcium carbonate dissolution is observed deeper in the water column. Settling whiting particles, however, reach the bottom of the lake, where they form a major constituent of the sediment, along with diatom frustules. The role of diatoms and associated EPS acting as nucleation surfaces for calcium carbonates is described for the first time here as a potential mechanism participating in whitings at Fayetteville Green Lake. This mechanism may have been largely overlooked in other whiting events in modern and ancient environments.
Identifiants
pubmed: 36326137
doi: 10.1111/gbi.12534
pmc: PMC10092686
doi:
Substances chimiques
Calcium
SY7Q814VUP
Calcium Carbonate
H0G9379FGK
Carbonates
0
Water
059QF0KO0R
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
210-228Subventions
Organisme : CIHR
Pays : Canada
Informations de copyright
© 2022 The Authors. Geobiology published by John Wiley & Sons Ltd.
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