The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts

Detalhes bibliográficos
Autor(a) principal: Gomes, A.I.
Data de Publicação: 2015
Outros Autores: Boski, T., Moura, Delminda, Szkornik, Katie, Connor, Simon, Witkowski, Andrzej
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/6863
Resumo: In order to tell the history of the Guadiana Estuary since the Last Glacial Maximum, a core collected therein, and spanning more than 13200 cal. years B.P., was studied regarding its diatom and chrysophyte cyst fossil records. Additionally, a diatom-based transfer function was used to reconstruct paleo-salinity and paleo-duration of tidal inundation to better understand the estuary’s evolution in relation to sea-level rise and climate changes. This study identifies some important climatic events, such as the Allerød climatic optimum, the Younger Dryas and three dry and cold events at 10600, 9100 and 7600 cal. years B.P., most of which were not identified by other proxies. Moreover, it also revealed that, prior to 13200 cal. years B.P., there was a mudflat environment in the place where the core was collected, consistent with an estuary slightly confined in the narrow valley under marine/tidal influence. Afterwards, this environment evolved into a salt marsh. The strongest marine influence was inferred to the period between 10000 and 7000 cal. years B.P., embracing a phase of rapid sea-level rise, non compensated by sedimentation, that favored the development of a mudflat. From this period onwards, diatom assemblages seem to indicate an evolution to a more enclosed environment, probably similar to the actual configuration of the area.
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spelling The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cystsla historia holocena de lo estuario del Guadiana contada por diatomeas y quistes de crisofíceasDiatomsChrysophyte cystsGuadianaSea-level riseClimatic eventsIn order to tell the history of the Guadiana Estuary since the Last Glacial Maximum, a core collected therein, and spanning more than 13200 cal. years B.P., was studied regarding its diatom and chrysophyte cyst fossil records. Additionally, a diatom-based transfer function was used to reconstruct paleo-salinity and paleo-duration of tidal inundation to better understand the estuary’s evolution in relation to sea-level rise and climate changes. This study identifies some important climatic events, such as the Allerød climatic optimum, the Younger Dryas and three dry and cold events at 10600, 9100 and 7600 cal. years B.P., most of which were not identified by other proxies. Moreover, it also revealed that, prior to 13200 cal. years B.P., there was a mudflat environment in the place where the core was collected, consistent with an estuary slightly confined in the narrow valley under marine/tidal influence. Afterwards, this environment evolved into a salt marsh. The strongest marine influence was inferred to the period between 10000 and 7000 cal. years B.P., embracing a phase of rapid sea-level rise, non compensated by sedimentation, that favored the development of a mudflat. From this period onwards, diatom assemblages seem to indicate an evolution to a more enclosed environment, probably similar to the actual configuration of the area.Servicios Integrales de Artes Gráficas S.L.L., Sia Graf, MálagaSapientiaGomes, A.I.Boski, T.Moura, DelmindaSzkornik, KatieConnor, SimonWitkowski, Andrzej2015-10-07T09:28:30Z2015-092015-09-01T00:00:00Zconference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10400.1/6863engAUT: PGS02043; AUT: TBO00513; AUT: DMO00293;info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-11-29T10:51:38Zoai:sapientia.ualg.pt:10400.1/6863Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-29T10:51:38Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
la historia holocena de lo estuario del Guadiana contada por diatomeas y quistes de crisofíceas
title The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
spellingShingle The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
Gomes, A.I.
Diatoms
Chrysophyte cysts
Guadiana
Sea-level rise
Climatic events
title_short The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
title_full The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
title_fullStr The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
title_full_unstemmed The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
title_sort The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
author Gomes, A.I.
author_facet Gomes, A.I.
Boski, T.
Moura, Delminda
Szkornik, Katie
Connor, Simon
Witkowski, Andrzej
author_role author
author2 Boski, T.
Moura, Delminda
Szkornik, Katie
Connor, Simon
Witkowski, Andrzej
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Gomes, A.I.
Boski, T.
Moura, Delminda
Szkornik, Katie
Connor, Simon
Witkowski, Andrzej
dc.subject.por.fl_str_mv Diatoms
Chrysophyte cysts
Guadiana
Sea-level rise
Climatic events
topic Diatoms
Chrysophyte cysts
Guadiana
Sea-level rise
Climatic events
description In order to tell the history of the Guadiana Estuary since the Last Glacial Maximum, a core collected therein, and spanning more than 13200 cal. years B.P., was studied regarding its diatom and chrysophyte cyst fossil records. Additionally, a diatom-based transfer function was used to reconstruct paleo-salinity and paleo-duration of tidal inundation to better understand the estuary’s evolution in relation to sea-level rise and climate changes. This study identifies some important climatic events, such as the Allerød climatic optimum, the Younger Dryas and three dry and cold events at 10600, 9100 and 7600 cal. years B.P., most of which were not identified by other proxies. Moreover, it also revealed that, prior to 13200 cal. years B.P., there was a mudflat environment in the place where the core was collected, consistent with an estuary slightly confined in the narrow valley under marine/tidal influence. Afterwards, this environment evolved into a salt marsh. The strongest marine influence was inferred to the period between 10000 and 7000 cal. years B.P., embracing a phase of rapid sea-level rise, non compensated by sedimentation, that favored the development of a mudflat. From this period onwards, diatom assemblages seem to indicate an evolution to a more enclosed environment, probably similar to the actual configuration of the area.
publishDate 2015
dc.date.none.fl_str_mv 2015-10-07T09:28:30Z
2015-09
2015-09-01T00:00:00Z
dc.type.driver.fl_str_mv conference object
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/6863
url http://hdl.handle.net/10400.1/6863
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv AUT: PGS02043; AUT: TBO00513; AUT: DMO00293;
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Servicios Integrales de Artes Gráficas S.L.L., Sia Graf, Málaga
publisher.none.fl_str_mv Servicios Integrales de Artes Gráficas S.L.L., Sia Graf, Málaga
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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