Bartels-Jonsdottir, Helga B; Knudsen, Karen Luise; Abrantes, Fatima F; Lebreiro, Susana Martin; Eiriksson, Jón (2006): Calcareous and agglutinated benthic foraminifera data from the Tagus prodelta (Portugal) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.858953, Supplement to: Bartels-Jonsdottir, HB et al. (2006): Climate variability during the last 2000 years in the Tagus Prodelta, western Iberian Margin: Benthic foraminifera and stable isotopes. Marine Micropaleontology, 59(2), 83-103, https://doi.org/10.1016/j.marmicro.2006.01.002
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Abstract:
A high resolution sedimentary sequence recovered in the Tagus Prodelta has been studied in order to reconstruct paleoenvironmental conditions on the western Iberian Margin, Portugal, through the last ca. 2000 years, including the historical time when anthropogenic influence became significant. Benthic foraminiferal assemblages as well as stable isotopic composition of the benthic foraminifera Uvigerina sp. were investigated. Considerable environmental fluctuations are indicated by all these proxies. Between AD 400 and 1400 (1550-550 cal year BP), during a period including the Medieval Warm Period, bottom water temperatures, as reconstructed from Uvigerina sp., were high, 13.3°C. In this time interval, species typical for shelf environments (Cassidulina laevigata, Nonion asterizans and Hyalinea balthica) maintained a high abundance along with opportunistic species like Bolivina dilatata and Bolivina pacifica, the most abundant species in the record. A faunal change occurred at around AD 1300-1400 (650-550 cal year BP), at the beginning of the Little Ice Age. After this, the environment became more variable in the Tagus Prodelta, as reflected by a decrease in faunal diversity and benthic foraminiferal composition and flux values. After about AD 1800 (150 cal year BP), bottom water temperatures rose to maximum values of the record. The disappearance of certain benthic taxa and the appearance of the species Saidovina karreriana indicate a change in bottom water conditions during the last 100 years, possibly induced by anthropogenic pollution.
Related to:
Lebreiro, Susana Martin; Francés, Guillermo; Abrantes, Fatima F; Diz, Paula; Bartels-Jonsdottir, Helga B; Stroynowski, Zuzanna N; Gil, Isabelle M; Pena, Leopoldo D; Rodrigues, Teresa; Jones, Philip D; Nombela, M A; Alejo, I; Briffa, Keith R; Harris, Ian; Grimalt, Joan O (2006): Climate change and coastal hydrographic response along the Atlantic Iberian margin (Tagus Prodelta and Muros Ria) during the last two millennia. The Holocene, 16(7), 1003-1015, https://doi.org/10.1177/0959683606hl990rp
Further details:
Abrantes, Fatima F; Lebreiro, Susana Martin; Rodrigues, Teresa; Gil, Isabelle M; Bartels-Jonsdottir, Helga B; Oliveira, Paulo; Kissel, Catherine; Grimalt, Joan O (2005): Sea surface temperature reconstruction on three sediment profiles off Portugal [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.761853 (Stable isotope and grain size data)
Coverage:
Median Latitude: 38.556004 * Median Longitude: -9.350194 * South-bound Latitude: 38.554000 * West-bound Longitude: -9.364500 * North-bound Latitude: 38.558170 * East-bound Longitude: -9.335500
Date/Time Start: 2000-09-01T00:00:00 * Date/Time End: 2002-04-29T10:08:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Bartels-Jonsdottir, HB; Knudsen, KL; Abrantes, FF et al. (2006): Agglutinated benthic foraminiferal fauna of sediment core D13902. https://doi.org/10.1594/PANGAEA.858952
- Bartels-Jonsdottir, HB; Knudsen, KL; Abrantes, FF et al. (2006): Agglutinated benthic foraminiferal fauna of a spliced sequence of sediment cores POS287_26-1B and POS287_26-3G. https://doi.org/10.1594/PANGAEA.858951
- Bartels-Jonsdottir, HB; Knudsen, KL; Abrantes, FF et al. (2006): Calcareous benthic foraminiferal fauna of a spliced sequence of sediment cores POS287_26-1B, POS287_26-3G and D13902. https://doi.org/10.1594/PANGAEA.858950