Holocene palaeoenvironment in a former coastal lagoon of the arid south eastern Iberian Peninsula: Salinization effects on δ15N

Marc Estiarte, Josep Peñuelas, Constancia López-Martínez, Ramon Pérez-Obiol

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8 Citations (Scopus)

Abstract

The palaeoenvironment of a former coastal lagoon in the south eastern Iberian Peninsula (San Rafael, Almeria, Spain) were inferred from one core analyzed for particulate organic matter content (POM) together with its C/N, δ13C, δ15N to depict the biogeochemical record from the Late Glacial to the Holocene. The results, complemented by previously reported pollen assemblages, indicate the appearance of a freshwater lagoon at 7300 b.p. (uncalibrated 14C age), its salinization at 6200 b.p. and its disappearance at 4400 b.p. The period of existence of the lagoon coincided with a period of wetter conditions as inferred from terrestrial vegetation. The lagoon's salinization was not related to a decrease in precipitation but to a stronger maritime influence since there were no parallel changes in terrestrial vegetation. Salinization caused an increase in δ13C, associated with a higher relative presence of C4 plants, and an increase in δ15N, due to a decrease in plant N demand. The late period of the lagoon, from about 5100 to 4400 b.p., shows a progressive drying and salinization not detected in isotopes but reflected in a decrease in POM, and in the pollen records. Increases in δ15N were related to increases in salinity within the lagoon, and are indicative of a more open N cycle, because the absence of changes in terrestrial vegetation rules out changes in the catchment area as the cause for changes in δ15N. © 2008 Springer-Verlag.
Original languageEnglish
Pages (from-to)667-674
JournalVegetation History and Archaeobotany
Volume17
Issue number6
DOIs
Publication statusPublished - 1 Nov 2008

Keywords

  • δ C 13
  • δ N 15
  • C/N
  • Climate
  • Holocene
  • Mediterranean
  • Salinization

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