Environmental change in SW Portugal during the last 3900 years BP: an ostracoda assessment

Fernandes Martins, Maria João; Cabral, Maria Cristina; Magalhães, Vitor Hugo; Drago, Teresa; Fatela, Francisco; Oliveira, Anabela

http://hdl.handle.net/10400.1/28306

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Autores

Fernandes Martins, Maria João

Cabral, Maria Cristina

Magalhães, Vitor Hugo

Drago, Teresa

Fatela, Francisco

Oliveira, Anabela

Resumo(s)

Ostracod, geochemical, mineralogical, and sedimentological proxies from a sediment core collected off Sagres (southwestern Portugal) were used to reconstruct Holocene environmental and hydrodynamic changes. Reduced variability of geochemical elements between ~4000 and ~1290 calibrated years before present suggests relatively stable conditions, regularly disturbed by higher-energy events. At ~1290 cal yrs BP, a transition from arid to wetter conditions is suggested based on enhanced terrestrial/detrital input after this time. Ostracod assemblages further captured fine-scale hydrodynamic variability, offering greater sensitivity to oceanographic changes. Our results support a broader pattern of middle-to-late Holocene drying conditions in southern Iberia, followed by a shift to wetter conditions during periods of negative North Atlantic Oscillation (NAO) index. Our study provides new data on offshore ostracods from the western Algarve, underscoring their value for high-resolution paleoenvironmental reconstructions.