Journal of Paleolimnology

, Volume 30, Issue 1, pp 95–111

Late Glacial and Holocene environmental history of the Pirin Mountains (SW Bulgaria): a paleolimnological study of Lake Dalgoto (2310 m)

  • Ivanka Stefanova
  • Nadja Ognjanova-Rumenova
  • Wolfgang Hofmann
  • Brigitta Ammann
Article

DOI: 10.1023/A:1024746818627

Cite this article as:
Stefanova, I., Ognjanova-Rumenova, N., Hofmann, W. et al. Journal of Paleolimnology (2003) 30: 95. doi:10.1023/A:1024746818627

Abstract

Diatoms, Cladocera, and chironomids preserved in the sediments of Lake Dalgoto were studied to reconstruct the history of the lake ecosystem in the context of the vegetation history as represented by the pollen stratigraphy. Younger Dryas silty sediments at the base of the core are characterized by low diversity of aquatic organisms. The transition to the Holocene is indicated by a sharp change from silt to clay-gyttja. The migration and expansion of trees at lower elevations between 10200 and 8500 14C-yr BP, along with higher diversities and concentrations of aquatic organisms and the decreased proportion of north-alpine diatoms, point to rapidly rising summer temperatures. After 6500 14C-yr BP the expansion of Pinus mugo in the catchment coincides with signs of natural eutrophication as recorded by an increase of planktonic diatoms. In the late Holocene (4000–0 14C-yr BP) Pinus peuce and Abies are reduced and Picea expands. Cereal grains and disturbance indicators suggest late-Holocene human modification of the vegetation.

ChironomidaeCladoceraDiatomsLate Quaternary environmentPollenSouthwestern Bulgaria

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Ivanka Stefanova
    • 1
    • 2
  • Nadja Ognjanova-Rumenova
    • 3
  • Wolfgang Hofmann
    • 4
  • Brigitta Ammann
    • 5
  1. 1.Institute of BotanyBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Limnological Research CenterUniversity of MinnesotaMinneapolisUSA
  3. 3.Institute of GeologyBulgarian Academy of SciencesSofiaBulgaria
  4. 4.Max-Planck Institute of LimnologyPlönGermany
  5. 5.Institute of Plant SciencesBernSwitzerland