Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat

Autores
Pan, Jeronimo; Cuadrado, Diana Graciela
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Modern marine microbial mats in siliciclastic settings are dominated by cyanobacteria and other microbes with significant roles in photosynthesis, such as pennate diatoms. Diatoms create a biofilm in the topmost layers, cutting off the incident radiation to the underlying mat of thickly packed cyanobacterial filaments. The thickness and cell density of these biofilms rich in exopolymeric substances (EPS) are related to hydration. Furthermore, biofilms may play a role in the entrapment of metabolic gases, the formation of bubbles and ultimately their preservation. This paper stems from field observations on the formation and early preservation of microbially generated bubbles in a siliciclastic sedimentary flat in Argentina (Paso Seco, 40°S; 62°W) under specific environmental conditions. On the one hand, when the flat is flooded by a stagnant layer of seawater, large-sized diatoms (Nitzschia sigma) secrete significant amounts of EPS and increase biomass by cell division, creating a ca.1to 2 cm thick biofilm that limits diffusion of gases and traps O2 bubbles. On the other hand, when the flat dries up after flooding, a biofilm with a ‘papyrus’-like texture is formed and deposited in layers on top of the sedimentary flat. This dry biofilm of coriaceous texture has high organic matter and chlorophyll a contents. Although they are very subtle structures, trapped, EPS-bound bubbles can withstand surface water currents and remain as permanent features, even when the biofilm dehydrates. As such, they have been found preserved in siltstones and claystones at a coastal palaeoichnological site in Argentina (Pehuen-Co). This study posits that bubble preservation is promoted by the mucilaginous-mineral matrix that becomes progressively desiccated, a finding that is of interest to sedimentologists and palaeobiologists.
Fil: Pan, Jeronimo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; Argentina
Fil: Cuadrado, Diana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Materia
BIOFILM
DIATOMS
EPS
GEOBIOLOGY
MICROBIAL PRESERVATION
PALAEOENVIRONMENT
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/291991
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flatPan, JeronimoCuadrado, Diana GracielaBIOFILMDIATOMSEPSGEOBIOLOGYMICROBIAL PRESERVATIONPALAEOENVIRONMENThttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Modern marine microbial mats in siliciclastic settings are dominated by cyanobacteria and other microbes with significant roles in photosynthesis, such as pennate diatoms. Diatoms create a biofilm in the topmost layers, cutting off the incident radiation to the underlying mat of thickly packed cyanobacterial filaments. The thickness and cell density of these biofilms rich in exopolymeric substances (EPS) are related to hydration. Furthermore, biofilms may play a role in the entrapment of metabolic gases, the formation of bubbles and ultimately their preservation. This paper stems from field observations on the formation and early preservation of microbially generated bubbles in a siliciclastic sedimentary flat in Argentina (Paso Seco, 40°S; 62°W) under specific environmental conditions. On the one hand, when the flat is flooded by a stagnant layer of seawater, large-sized diatoms (Nitzschia sigma) secrete significant amounts of EPS and increase biomass by cell division, creating a ca.1to 2 cm thick biofilm that limits diffusion of gases and traps O2 bubbles. On the other hand, when the flat dries up after flooding, a biofilm with a ‘papyrus’-like texture is formed and deposited in layers on top of the sedimentary flat. This dry biofilm of coriaceous texture has high organic matter and chlorophyll a contents. Although they are very subtle structures, trapped, EPS-bound bubbles can withstand surface water currents and remain as permanent features, even when the biofilm dehydrates. As such, they have been found preserved in siltstones and claystones at a coastal palaeoichnological site in Argentina (Pehuen-Co). This study posits that bubble preservation is promoted by the mucilaginous-mineral matrix that becomes progressively desiccated, a finding that is of interest to sedimentologists and palaeobiologists.Fil: Pan, Jeronimo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; ArgentinaFil: Cuadrado, Diana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; ArgentinaWiley Blackwell Publishing, Inc2025-12-14info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/291991Pan, Jeronimo; Cuadrado, Diana Graciela; Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat; Wiley Blackwell Publishing, Inc; Sedimentology; 73; 4; 14-12-2025; 1053-10750037-0746CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/10.1111/sed.70066info:eu-repo/semantics/altIdentifier/doi/10.1111/sed.70066info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T15:09:44Zoai:ri.conicet.gov.ar:11336/291991instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-08-25 15:09:45.643CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
title Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
spellingShingle Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
Pan, Jeronimo
BIOFILM
DIATOMS
EPS
GEOBIOLOGY
MICROBIAL PRESERVATION
PALAEOENVIRONMENT
title_short Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
title_full Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
title_fullStr Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
title_full_unstemmed Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
title_sort Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat
dc.creator.none.fl_str_mv Pan, Jeronimo
Cuadrado, Diana Graciela
author Pan, Jeronimo
author_facet Pan, Jeronimo
Cuadrado, Diana Graciela
author_role author
author2 Cuadrado, Diana Graciela
author2_role author
dc.subject.none.fl_str_mv BIOFILM
DIATOMS
EPS
GEOBIOLOGY
MICROBIAL PRESERVATION
PALAEOENVIRONMENT
topic BIOFILM
DIATOMS
EPS
GEOBIOLOGY
MICROBIAL PRESERVATION
PALAEOENVIRONMENT
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Modern marine microbial mats in siliciclastic settings are dominated by cyanobacteria and other microbes with significant roles in photosynthesis, such as pennate diatoms. Diatoms create a biofilm in the topmost layers, cutting off the incident radiation to the underlying mat of thickly packed cyanobacterial filaments. The thickness and cell density of these biofilms rich in exopolymeric substances (EPS) are related to hydration. Furthermore, biofilms may play a role in the entrapment of metabolic gases, the formation of bubbles and ultimately their preservation. This paper stems from field observations on the formation and early preservation of microbially generated bubbles in a siliciclastic sedimentary flat in Argentina (Paso Seco, 40°S; 62°W) under specific environmental conditions. On the one hand, when the flat is flooded by a stagnant layer of seawater, large-sized diatoms (Nitzschia sigma) secrete significant amounts of EPS and increase biomass by cell division, creating a ca.1to 2 cm thick biofilm that limits diffusion of gases and traps O2 bubbles. On the other hand, when the flat dries up after flooding, a biofilm with a ‘papyrus’-like texture is formed and deposited in layers on top of the sedimentary flat. This dry biofilm of coriaceous texture has high organic matter and chlorophyll a contents. Although they are very subtle structures, trapped, EPS-bound bubbles can withstand surface water currents and remain as permanent features, even when the biofilm dehydrates. As such, they have been found preserved in siltstones and claystones at a coastal palaeoichnological site in Argentina (Pehuen-Co). This study posits that bubble preservation is promoted by the mucilaginous-mineral matrix that becomes progressively desiccated, a finding that is of interest to sedimentologists and palaeobiologists.
Fil: Pan, Jeronimo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; Argentina
Fil: Cuadrado, Diana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
description Modern marine microbial mats in siliciclastic settings are dominated by cyanobacteria and other microbes with significant roles in photosynthesis, such as pennate diatoms. Diatoms create a biofilm in the topmost layers, cutting off the incident radiation to the underlying mat of thickly packed cyanobacterial filaments. The thickness and cell density of these biofilms rich in exopolymeric substances (EPS) are related to hydration. Furthermore, biofilms may play a role in the entrapment of metabolic gases, the formation of bubbles and ultimately their preservation. This paper stems from field observations on the formation and early preservation of microbially generated bubbles in a siliciclastic sedimentary flat in Argentina (Paso Seco, 40°S; 62°W) under specific environmental conditions. On the one hand, when the flat is flooded by a stagnant layer of seawater, large-sized diatoms (Nitzschia sigma) secrete significant amounts of EPS and increase biomass by cell division, creating a ca.1to 2 cm thick biofilm that limits diffusion of gases and traps O2 bubbles. On the other hand, when the flat dries up after flooding, a biofilm with a ‘papyrus’-like texture is formed and deposited in layers on top of the sedimentary flat. This dry biofilm of coriaceous texture has high organic matter and chlorophyll a contents. Although they are very subtle structures, trapped, EPS-bound bubbles can withstand surface water currents and remain as permanent features, even when the biofilm dehydrates. As such, they have been found preserved in siltstones and claystones at a coastal palaeoichnological site in Argentina (Pehuen-Co). This study posits that bubble preservation is promoted by the mucilaginous-mineral matrix that becomes progressively desiccated, a finding that is of interest to sedimentologists and palaeobiologists.
publishDate 2025
dc.date.none.fl_str_mv 2025-12-14
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/291991
Pan, Jeronimo; Cuadrado, Diana Graciela; Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat; Wiley Blackwell Publishing, Inc; Sedimentology; 73; 4; 14-12-2025; 1053-1075
0037-0746
CONICET Digital
CONICET
url http://hdl.handle.net/11336/291991
identifier_str_mv Pan, Jeronimo; Cuadrado, Diana Graciela; Microbially generated bubbles preserved by biofilms in a siliciclastic sedimentary flat; Wiley Blackwell Publishing, Inc; Sedimentology; 73; 4; 14-12-2025; 1053-1075
0037-0746
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/10.1111/sed.70066
info:eu-repo/semantics/altIdentifier/doi/10.1111/sed.70066
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.24418

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