Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record

Autores
de Francesco, Claudio German; Hassan, Gabriela Susana
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Premortem and postmortem processes significantly influence the formation of the molluscan fossil record in freshwater environments. Despite their importance for paleoenvironmental studies, they remain poorly understood. In Pampean shallow lakes, Holocene shell deposits of the euryhaline snail Heleobia parchappii show a relation with salinity, as preservation seems to be favored by brackish-saline water conditions. To explore if this pattern may respond to ecological (i.e., differential survival and reproduction) or taphonomic processes acting differently in freshwater and brackish-saline environments, we conducted a field-based study comparing premortem (abundance, length, width/length ratio and crushing resistance in living and dead shells) and postmortem (fragmentation, fine-scale surface alteration and loss of periostracum of dead shells) attributes along a modern lacustrine salinity gradient (0.5-40 ppt) in the Pampa plain of Argentina. Snails from saline lakes were smaller and more rotund than those from freshwater lakes, exhibiting higher abundances and resistances in death assemblages. They showed the highest fidelity in shell length and the best states of preservation, which were similar to values recorded in fossil shells. We concluded that shells deposited in saline lakes are better preserved than those deposited in freshwater lakes, giving rise to highly abundant shell concentrations, analogues to those shell-rich fossil levels recorded in Pampean lakes. Such abundance does not reflect the natural abundances of living snails, but is the result of the combined influence that less destructive environments and better shell intrinsic properties have on preservation.
Fil: de Francesco, Claudio German. 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
Fil: Hassan, Gabriela Susana. 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
2nd Workshop on Actualistic Taphonomy
Rio Grande do Sul
Brasil
Centro de Estudos Costeiros, Limnológicos e Marinhos
Materia
Mollusks
Taphonomy
Shallow Lakes
Pampas
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:11336/218957
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/218957
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil recordde Francesco, Claudio GermanHassan, Gabriela SusanaMollusksTaphonomyShallow LakesPampashttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Premortem and postmortem processes significantly influence the formation of the molluscan fossil record in freshwater environments. Despite their importance for paleoenvironmental studies, they remain poorly understood. In Pampean shallow lakes, Holocene shell deposits of the euryhaline snail Heleobia parchappii show a relation with salinity, as preservation seems to be favored by brackish-saline water conditions. To explore if this pattern may respond to ecological (i.e., differential survival and reproduction) or taphonomic processes acting differently in freshwater and brackish-saline environments, we conducted a field-based study comparing premortem (abundance, length, width/length ratio and crushing resistance in living and dead shells) and postmortem (fragmentation, fine-scale surface alteration and loss of periostracum of dead shells) attributes along a modern lacustrine salinity gradient (0.5-40 ppt) in the Pampa plain of Argentina. Snails from saline lakes were smaller and more rotund than those from freshwater lakes, exhibiting higher abundances and resistances in death assemblages. They showed the highest fidelity in shell length and the best states of preservation, which were similar to values recorded in fossil shells. We concluded that shells deposited in saline lakes are better preserved than those deposited in freshwater lakes, giving rise to highly abundant shell concentrations, analogues to those shell-rich fossil levels recorded in Pampean lakes. Such abundance does not reflect the natural abundances of living snails, but is the result of the combined influence that less destructive environments and better shell intrinsic properties have on preservation.Fil: de Francesco, Claudio German. 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; ArgentinaFil: Hassan, Gabriela Susana. 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; Argentina2nd Workshop on Actualistic TaphonomyRio Grande do SulBrasilCentro de Estudos Costeiros, Limnológicos e MarinhosUniversidad de Rio Grande do SulRitter, Matias N.Erthal, FernandoHorodyski, Rodrigo S.2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectWorkshopBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/218957Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record; 2nd Workshop on Actualistic Taphonomy; Rio Grande do Sul; Brasil; 2021; 20-20CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.ufrgs.br/taas/wp-content/uploads/2021/07/Abstracts-2nd-TAAS-Workshop-on-Actualistic-Taphonomy-in-South-America.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.5281/zenodo.5114543Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:10:38Zoai:ri.conicet.gov.ar:11336/218957instacron: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:34982025-09-03 10:10:38.44CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
title Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
spellingShingle Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
de Francesco, Claudio German
Mollusks
Taphonomy
Shallow Lakes
Pampas
title_short Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
title_full Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
title_fullStr Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
title_full_unstemmed Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
title_sort Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record
dc.creator.none.fl_str_mv de Francesco, Claudio German
Hassan, Gabriela Susana
author de Francesco, Claudio German
author_facet de Francesco, Claudio German
Hassan, Gabriela Susana
author_role author
author2 Hassan, Gabriela Susana
author2_role author
dc.contributor.none.fl_str_mv Ritter, Matias N.
Erthal, Fernando
Horodyski, Rodrigo S.
dc.subject.none.fl_str_mv Mollusks
Taphonomy
Shallow Lakes
Pampas
topic Mollusks
Taphonomy
Shallow Lakes
Pampas
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Premortem and postmortem processes significantly influence the formation of the molluscan fossil record in freshwater environments. Despite their importance for paleoenvironmental studies, they remain poorly understood. In Pampean shallow lakes, Holocene shell deposits of the euryhaline snail Heleobia parchappii show a relation with salinity, as preservation seems to be favored by brackish-saline water conditions. To explore if this pattern may respond to ecological (i.e., differential survival and reproduction) or taphonomic processes acting differently in freshwater and brackish-saline environments, we conducted a field-based study comparing premortem (abundance, length, width/length ratio and crushing resistance in living and dead shells) and postmortem (fragmentation, fine-scale surface alteration and loss of periostracum of dead shells) attributes along a modern lacustrine salinity gradient (0.5-40 ppt) in the Pampa plain of Argentina. Snails from saline lakes were smaller and more rotund than those from freshwater lakes, exhibiting higher abundances and resistances in death assemblages. They showed the highest fidelity in shell length and the best states of preservation, which were similar to values recorded in fossil shells. We concluded that shells deposited in saline lakes are better preserved than those deposited in freshwater lakes, giving rise to highly abundant shell concentrations, analogues to those shell-rich fossil levels recorded in Pampean lakes. Such abundance does not reflect the natural abundances of living snails, but is the result of the combined influence that less destructive environments and better shell intrinsic properties have on preservation.
Fil: de Francesco, Claudio German. 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
Fil: Hassan, Gabriela Susana. 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
2nd Workshop on Actualistic Taphonomy
Rio Grande do Sul
Brasil
Centro de Estudos Costeiros, Limnológicos e Marinhos
description Premortem and postmortem processes significantly influence the formation of the molluscan fossil record in freshwater environments. Despite their importance for paleoenvironmental studies, they remain poorly understood. In Pampean shallow lakes, Holocene shell deposits of the euryhaline snail Heleobia parchappii show a relation with salinity, as preservation seems to be favored by brackish-saline water conditions. To explore if this pattern may respond to ecological (i.e., differential survival and reproduction) or taphonomic processes acting differently in freshwater and brackish-saline environments, we conducted a field-based study comparing premortem (abundance, length, width/length ratio and crushing resistance in living and dead shells) and postmortem (fragmentation, fine-scale surface alteration and loss of periostracum of dead shells) attributes along a modern lacustrine salinity gradient (0.5-40 ppt) in the Pampa plain of Argentina. Snails from saline lakes were smaller and more rotund than those from freshwater lakes, exhibiting higher abundances and resistances in death assemblages. They showed the highest fidelity in shell length and the best states of preservation, which were similar to values recorded in fossil shells. We concluded that shells deposited in saline lakes are better preserved than those deposited in freshwater lakes, giving rise to highly abundant shell concentrations, analogues to those shell-rich fossil levels recorded in Pampean lakes. Such abundance does not reflect the natural abundances of living snails, but is the result of the combined influence that less destructive environments and better shell intrinsic properties have on preservation.
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Workshop
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/218957
Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record; 2nd Workshop on Actualistic Taphonomy; Rio Grande do Sul; Brasil; 2021; 20-20
CONICET Digital
CONICET
url http://hdl.handle.net/11336/218957
identifier_str_mv Differential preservation of mollusks in pampean shallow lakes: implications for the understanding of the pampean lacustrine fossil record; 2nd Workshop on Actualistic Taphonomy; Rio Grande do Sul; Brasil; 2021; 20-20
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://www.ufrgs.br/taas/wp-content/uploads/2021/07/Abstracts-2nd-TAAS-Workshop-on-Actualistic-Taphonomy-in-South-America.pdf
info:eu-repo/semantics/altIdentifier/doi/10.5281/zenodo.5114543
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Universidad de Rio Grande do Sul
publisher.none.fl_str_mv Universidad de Rio Grande do Sul
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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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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