Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf

Autores
Díaz, Germán Ricardo; Plastani, María Sofía; Martín, Rodrigo Sebastian; Albarracin, Paula Belen; García Chapori, Natalia Luz; Laprida, Cecilia
Año de publicación
2023
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Rapid sea level changes have severe consequences for coastal ecosystems. As a consequence, bioproxies are frequently used to define relative sea level in the past, allowing the recognition between fully marine from fully continental facies. However, in transitional environments, organisms with different ecological requirements are often found together in the same fossil assemblage. This fact, combined with the biases the biostratinomic processes impose to the fossil record, turn difficult to establish the relative influence of marine and continental environments. Paleocommunities are often characterized using different measures of diversity, and the different environmental phases are frequently identified through multivariate analysis. However, depending on the communities’ structure, spurious trends may arise if key indicator species present in the assemblages are not adequately identified. By combining cluster analyses and the recognition of indicator species according to the coefficient of association (ϕ), paleoenvironmental trends can be recognized more clearly than when the total assemblages are considered. We analyzed this issue in the core SHN-T394 (40°09´S-57°14´W) recovered from the outer shelf at a depth of 100 m. The upper 135 cm of the core was deposited during Late Glacial-Early Holocene, when a rapid sea level rise had taken place thereafter the LGM. Foraminifera and ostracods were analyzed, hierarchical cluster analyses were performed separately, and indicator species were recognized for each cluster based on the ϕ values. The cluster analysis allowed to distinguish three benthic foraminiferal assemblages: Buccella peruviana is the only indicator species of the basal cluster; Ammonia beccarii is the only indicator species of the second cluster; and Pyrgo ringens, Quinqueloculina atlantica and Uvigerina striata are the indicators species of the third cluster. In turn, the cluster analysis allowed to distinguish four ostracod assemblages. In the basal cluster, no indicator species could be identified; the second cluster was characterized by two indicator species, Limnocythere solum and L. multiperforata; the third cluster exhibited numerous species but only Pellucistoma elongatum and Loxocythere variasculpta constitute indicator species. Finally, in the fourth cluster, Protocytheretta sp. and Minicythere argentinensis were identified as indicator species. When considering the results obtained from the analysis of ostracods and foraminifera simultaneously, it became clear that both bioproxies reflect a trend towards a rapid sea-level rise enabling the recognition of a rapid transition from continental and transitional facies to fully marine facies. However, ostracods provide a higher resolution for characterize transitional paleoenvironment. Additionally, the use of algorithms to identify indicator species allows for a better recognition of environmental trends, thereby facilitating the visualization of paleoenvironmental evolution.
Fil: Díaz, Germán Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Martín, Rodrigo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Albarracin, Paula Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: García Chapori, Natalia Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Laprida, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología
La Plata
Argentina
Asociación Argentina de Sedimentología
Materia
Paleoceanografía
Paleoecología
Foraminífera
Ostracoda
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:11336/223107
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelfDíaz, Germán RicardoPlastani, María SofíaMartín, Rodrigo SebastianAlbarracin, Paula BelenGarcía Chapori, Natalia LuzLaprida, CeciliaPaleoceanografíaPaleoecologíaForaminíferaOstracodahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Rapid sea level changes have severe consequences for coastal ecosystems. As a consequence, bioproxies are frequently used to define relative sea level in the past, allowing the recognition between fully marine from fully continental facies. However, in transitional environments, organisms with different ecological requirements are often found together in the same fossil assemblage. This fact, combined with the biases the biostratinomic processes impose to the fossil record, turn difficult to establish the relative influence of marine and continental environments. Paleocommunities are often characterized using different measures of diversity, and the different environmental phases are frequently identified through multivariate analysis. However, depending on the communities’ structure, spurious trends may arise if key indicator species present in the assemblages are not adequately identified. By combining cluster analyses and the recognition of indicator species according to the coefficient of association (ϕ), paleoenvironmental trends can be recognized more clearly than when the total assemblages are considered. We analyzed this issue in the core SHN-T394 (40°09´S-57°14´W) recovered from the outer shelf at a depth of 100 m. The upper 135 cm of the core was deposited during Late Glacial-Early Holocene, when a rapid sea level rise had taken place thereafter the LGM. Foraminifera and ostracods were analyzed, hierarchical cluster analyses were performed separately, and indicator species were recognized for each cluster based on the ϕ values. The cluster analysis allowed to distinguish three benthic foraminiferal assemblages: Buccella peruviana is the only indicator species of the basal cluster; Ammonia beccarii is the only indicator species of the second cluster; and Pyrgo ringens, Quinqueloculina atlantica and Uvigerina striata are the indicators species of the third cluster. In turn, the cluster analysis allowed to distinguish four ostracod assemblages. In the basal cluster, no indicator species could be identified; the second cluster was characterized by two indicator species, Limnocythere solum and L. multiperforata; the third cluster exhibited numerous species but only Pellucistoma elongatum and Loxocythere variasculpta constitute indicator species. Finally, in the fourth cluster, Protocytheretta sp. and Minicythere argentinensis were identified as indicator species. When considering the results obtained from the analysis of ostracods and foraminifera simultaneously, it became clear that both bioproxies reflect a trend towards a rapid sea-level rise enabling the recognition of a rapid transition from continental and transitional facies to fully marine facies. However, ostracods provide a higher resolution for characterize transitional paleoenvironment. Additionally, the use of algorithms to identify indicator species allows for a better recognition of environmental trends, thereby facilitating the visualization of paleoenvironmental evolution.Fil: Díaz, Germán Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Martín, Rodrigo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Albarracin, Paula Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: García Chapori, Natalia Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Laprida, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaXVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de SedimentologíaLa PlataArgentinaAsociación Argentina de SedimentologíaAsociación Argentina de Sedimentología2023info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/223107Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 121-121978-631-90299-0-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.ras2023laplata.com/_files/ugd/0306a6_7fd69ea257d34faf86f5d4d284533dc9.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:08:04Zoai:ri.conicet.gov.ar:11336/223107instacron: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 10:08:04.788CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
title Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
spellingShingle Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
Díaz, Germán Ricardo
Paleoceanografía
Paleoecología
Foraminífera
Ostracoda
title_short Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
title_full Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
title_fullStr Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
title_full_unstemmed Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
title_sort Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf
dc.creator.none.fl_str_mv Díaz, Germán Ricardo
Plastani, María Sofía
Martín, Rodrigo Sebastian
Albarracin, Paula Belen
García Chapori, Natalia Luz
Laprida, Cecilia
author Díaz, Germán Ricardo
author_facet Díaz, Germán Ricardo
Plastani, María Sofía
Martín, Rodrigo Sebastian
Albarracin, Paula Belen
García Chapori, Natalia Luz
Laprida, Cecilia
author_role author
author2 Plastani, María Sofía
Martín, Rodrigo Sebastian
Albarracin, Paula Belen
García Chapori, Natalia Luz
Laprida, Cecilia
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Paleoceanografía
Paleoecología
Foraminífera
Ostracoda
topic Paleoceanografía
Paleoecología
Foraminífera
Ostracoda
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Rapid sea level changes have severe consequences for coastal ecosystems. As a consequence, bioproxies are frequently used to define relative sea level in the past, allowing the recognition between fully marine from fully continental facies. However, in transitional environments, organisms with different ecological requirements are often found together in the same fossil assemblage. This fact, combined with the biases the biostratinomic processes impose to the fossil record, turn difficult to establish the relative influence of marine and continental environments. Paleocommunities are often characterized using different measures of diversity, and the different environmental phases are frequently identified through multivariate analysis. However, depending on the communities’ structure, spurious trends may arise if key indicator species present in the assemblages are not adequately identified. By combining cluster analyses and the recognition of indicator species according to the coefficient of association (ϕ), paleoenvironmental trends can be recognized more clearly than when the total assemblages are considered. We analyzed this issue in the core SHN-T394 (40°09´S-57°14´W) recovered from the outer shelf at a depth of 100 m. The upper 135 cm of the core was deposited during Late Glacial-Early Holocene, when a rapid sea level rise had taken place thereafter the LGM. Foraminifera and ostracods were analyzed, hierarchical cluster analyses were performed separately, and indicator species were recognized for each cluster based on the ϕ values. The cluster analysis allowed to distinguish three benthic foraminiferal assemblages: Buccella peruviana is the only indicator species of the basal cluster; Ammonia beccarii is the only indicator species of the second cluster; and Pyrgo ringens, Quinqueloculina atlantica and Uvigerina striata are the indicators species of the third cluster. In turn, the cluster analysis allowed to distinguish four ostracod assemblages. In the basal cluster, no indicator species could be identified; the second cluster was characterized by two indicator species, Limnocythere solum and L. multiperforata; the third cluster exhibited numerous species but only Pellucistoma elongatum and Loxocythere variasculpta constitute indicator species. Finally, in the fourth cluster, Protocytheretta sp. and Minicythere argentinensis were identified as indicator species. When considering the results obtained from the analysis of ostracods and foraminifera simultaneously, it became clear that both bioproxies reflect a trend towards a rapid sea-level rise enabling the recognition of a rapid transition from continental and transitional facies to fully marine facies. However, ostracods provide a higher resolution for characterize transitional paleoenvironment. Additionally, the use of algorithms to identify indicator species allows for a better recognition of environmental trends, thereby facilitating the visualization of paleoenvironmental evolution.
Fil: Díaz, Germán Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Martín, Rodrigo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Albarracin, Paula Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: García Chapori, Natalia Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Laprida, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología
La Plata
Argentina
Asociación Argentina de Sedimentología
description Rapid sea level changes have severe consequences for coastal ecosystems. As a consequence, bioproxies are frequently used to define relative sea level in the past, allowing the recognition between fully marine from fully continental facies. However, in transitional environments, organisms with different ecological requirements are often found together in the same fossil assemblage. This fact, combined with the biases the biostratinomic processes impose to the fossil record, turn difficult to establish the relative influence of marine and continental environments. Paleocommunities are often characterized using different measures of diversity, and the different environmental phases are frequently identified through multivariate analysis. However, depending on the communities’ structure, spurious trends may arise if key indicator species present in the assemblages are not adequately identified. By combining cluster analyses and the recognition of indicator species according to the coefficient of association (ϕ), paleoenvironmental trends can be recognized more clearly than when the total assemblages are considered. We analyzed this issue in the core SHN-T394 (40°09´S-57°14´W) recovered from the outer shelf at a depth of 100 m. The upper 135 cm of the core was deposited during Late Glacial-Early Holocene, when a rapid sea level rise had taken place thereafter the LGM. Foraminifera and ostracods were analyzed, hierarchical cluster analyses were performed separately, and indicator species were recognized for each cluster based on the ϕ values. The cluster analysis allowed to distinguish three benthic foraminiferal assemblages: Buccella peruviana is the only indicator species of the basal cluster; Ammonia beccarii is the only indicator species of the second cluster; and Pyrgo ringens, Quinqueloculina atlantica and Uvigerina striata are the indicators species of the third cluster. In turn, the cluster analysis allowed to distinguish four ostracod assemblages. In the basal cluster, no indicator species could be identified; the second cluster was characterized by two indicator species, Limnocythere solum and L. multiperforata; the third cluster exhibited numerous species but only Pellucistoma elongatum and Loxocythere variasculpta constitute indicator species. Finally, in the fourth cluster, Protocytheretta sp. and Minicythere argentinensis were identified as indicator species. When considering the results obtained from the analysis of ostracods and foraminifera simultaneously, it became clear that both bioproxies reflect a trend towards a rapid sea-level rise enabling the recognition of a rapid transition from continental and transitional facies to fully marine facies. However, ostracods provide a higher resolution for characterize transitional paleoenvironment. Additionally, the use of algorithms to identify indicator species allows for a better recognition of environmental trends, thereby facilitating the visualization of paleoenvironmental evolution.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
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/11336/223107
Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 121-121
978-631-90299-0-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/223107
identifier_str_mv Communities’ response to eustatic sea level variations during the late glacial flooding of the buenos aires continental shelf; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 121-121
978-631-90299-0-1
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.ras2023laplata.com/_files/ugd/0306a6_7fd69ea257d34faf86f5d4d284533dc9.pdf
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Asociación Argentina de Sedimentología
publisher.none.fl_str_mv Asociación Argentina de Sedimentología
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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