The Holocene history of the Guadiana estuary as told by diatoms and chrysophyte cysts
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
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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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 |
status_str |
publishedVersion |
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 |
dc.format.none.fl_str_mv |
application/pdf |
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 |
_version_ |
1817549841121673216 |