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Marsh benthic Foraminifera response to estuarine hydrological balance driven by climate variability over the last 2000 yr (Minho estuary, NW Portugal)

Published online by Cambridge University Press:  20 January 2017

João Moreno ,
Francisco Fatela ,
Eduardo Leorri ,
José M. De la Rosa ,
Inês Pereira ,
M. Fátima Araújo ,
M. Conceição Freitas ,
D. Reide Corbett  and
Ana Medeiros
João Moreno*
Affiliation:
Universidade de Lisboa, Faculdade de Ciências, Centro de Geologia, Departamento de Geologia, Campo Grande, 1749-016 Lisboa, Portugal
Francisco Fatela
Affiliation:
Universidade de Lisboa, Faculdade de Ciências, Centro de Geologia, Departamento de Geologia, Campo Grande, 1749-016 Lisboa, Portugal
Eduardo Leorri
Affiliation:
East Carolina University, Department of Geological Sciences, Greenville, NC 27858-4353, USA
José M. De la Rosa
Affiliation:
Instituto de Recursos Naturales y Agrobiología de Sevilla, Av. Reina Mercedes 10, 41012 Sevilla, Spain
Inês Pereira
Affiliation:
Universidade de Lisboa, Instituto Superior Técnico, Centro de Ciências e Tecnologias Nucleares, Estrada Nacional 10, km 139,7, 2695-066 Bobadela LRS, Portugal
M. Fátima Araújo
Affiliation:
Universidade de Lisboa, Instituto Superior Técnico, Centro de Ciências e Tecnologias Nucleares, Estrada Nacional 10, km 139,7, 2695-066 Bobadela LRS, Portugal
M. Conceição Freitas
Affiliation:
Universidade de Lisboa, Faculdade de Ciências, Centro de Geologia, Departamento de Geologia, Campo Grande, 1749-016 Lisboa, Portugal
D. Reide Corbett
Affiliation:
East Carolina University, Department of Geological Sciences, Greenville, NC 27858-4353, USA
Ana Medeiros
Affiliation:
Universidade de Lisboa, Instituto Superior Técnico, Centro de Ciências e Tecnologias Nucleares, Estrada Nacional 10, km 139,7, 2695-066 Bobadela LRS, Portugal
*
*Corresponding author. Fax: + 351 21 750 01 19. E-mail address:[email protected] (J. Moreno).
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Abstract

A high-resolution study of a marsh sedimentary sequence from the Minho estuary provides a new palaeoenvironmental reconstruction from NW Iberian based on geological proxies supported by historical and instrumental climatic records. A low-salinity tidal flat, dominated by Trochamminita salsa, Haplophragmoides spp. and Cribrostomoides spp., prevailed from AD 140–1360 (Roman Warm Period, Dark Ages, Medieval Climatic Anomaly). This sheltered environment was affected by high hydrodynamic episodes, marked by the increase in silt/clay ratio, decrease of organic matter, and poor and weakly preserved foraminiferal assemblages, suggesting enhanced river runoff. The establishment of low marsh began at AD 1380. This low-salinity environment, marked by colder and wet conditions, persisted from AD 1410–1770 (Little Ice Age), when foraminiferal density increased significantly. Haplophragmoides manilaensis and Trochamminita salsa mark the transition from low to high marsh at AD 1730. Since AD 1780 the abundances of salt marsh species (Jadammina macrescens, Trochammina inflata) increased, accompanied by a decrease in foraminiferal density, reflecting climate instability, when droughts alternate with severe floods. SW Europe marsh foraminifera respond to the hydrological balance, controlled by climatic variability modes (e.g., NAO) and solar activity, thus contributing to the understanding of NE Atlantic climate dynamics.

Keywords

Marsh foraminiferaHydrological balancePalaeoenvironmental reconstructionClimate variabilityRWP to PresentMinho estuaryNW Iberian region
Type
Articles
Information
Quaternary Research , Volume 82 , Issue 2 , September 2014 , pp. 318 - 330
Copyright
University of Washington

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Footnotes

1 Present address: LIRIO — Pólo de Estremoz da Universidade de Évora, Convento das Maltezas, 7100-513 Estremoz.

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