Origin of the forest steppe and exceptional grassland diversity in Transylvania (central-eastern Europe)

Angelica Feurdean, Elena Marinova, Anne B. Nielsen, Johan Liakka, Daniel Veres, Simon M. Hutchinson, M. Braun, Alida Timar-Gabor, Ciprian Astalos, Volker Mosburgger, Thomas Hickler

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Aim: The forest steppe of the Transylvanian Plain is a landscape of exceptionally diverse steppe-like and semi-natural grasslands. Is this vegetation a remnant of a once continuous temperate forest extensively cleared by humans, or has the area, since the last glacial, always been a forest steppe? Understanding the processes that drive temperate grassland formation is important because effective management of this biome is critical to the conservation of the European cultural landscape. Location: Lake Stiucii, north-western Romania, central-eastern Europe. Methods: We analysed multi-proxy variables (pollen, coprophilous fungi, plant macroremains, macrocharcoal) from a 55,000 year discontinuous sequence (c. 55,000-35,000; 13,000-0 cal. yr bp), integrating models of pollen-based vegetation cover, biome reconstruction, global atmospheric simulations and archaeological records. Results: Needleleaf woodland occurred during glacial Marine Isotope Stage (MIS) 3, but contracted at the end of this period. Forest coverage of c. 55% (early Holocene) and 65% (mid-Holocene) prevailed through the Holocene, but Bronze Age humans extensively cleared forests after 3700 cal. yr bp. Forest coverage was most widespread between 8600 and 3700 cal. yr bp, whereas grasses, steppe and xerothermic forbs were most extensive between 11,700 and 8600 cal. yr bp and during the last 3700 cal. yr bp. Cerealia pollen indicate the presence of arable agriculture by c. 7000 cal. yr bp. Main conclusions: We have provided the first unequivocal evidence for needleleaf woodland during glacial MIS 3 in this region. Extensive forests prevailed prior to 3700 cal. yr bp, challenging the hypothesis that the Transylvanian lowlands were never wooded following the last glaciation. However, these forests were never fully closed either, reflecting dry growing season conditions, recurrent fires and anthropogenic impacts, which have favoured grassland persistence throughout the Holocene. The longevity of natural and semi-natural grasslands in the region may explain their current exceptional biodiversity. This longer-term perspective implies that future climatic warming and associated fire will maintain these grasslands.

Original languageEnglish
Pages (from-to)951-963
Number of pages13
JournalJournal of Biogeography
Volume42
Issue number5
DOIs
Publication statusPublished - May 1 2015

Fingerprint

forest-steppe
Eastern European region
steppes
grasslands
grassland
Holocene
pollen
marine isotope stage
biome
steppe
woodland
arable farming
woodlands
isotopes
Bronze Age
cultural landscape
last glaciation
Last Glacial
temperate forest
vegetation cover

Keywords

  • Anthropogenic impact
  • Bronze Age
  • Fire
  • Grassland diversity
  • Holocene
  • MIS-3
  • Palaeoecology
  • REVEALS
  • Romania
  • Steppe

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Feurdean, A., Marinova, E., Nielsen, A. B., Liakka, J., Veres, D., Hutchinson, S. M., ... Hickler, T. (2015). Origin of the forest steppe and exceptional grassland diversity in Transylvania (central-eastern Europe). Journal of Biogeography, 42(5), 951-963. https://doi.org/10.1111/jbi.12468

Origin of the forest steppe and exceptional grassland diversity in Transylvania (central-eastern Europe). / Feurdean, Angelica; Marinova, Elena; Nielsen, Anne B.; Liakka, Johan; Veres, Daniel; Hutchinson, Simon M.; Braun, M.; Timar-Gabor, Alida; Astalos, Ciprian; Mosburgger, Volker; Hickler, Thomas.

In: Journal of Biogeography, Vol. 42, No. 5, 01.05.2015, p. 951-963.

Research output: Contribution to journalArticle

Feurdean, A, Marinova, E, Nielsen, AB, Liakka, J, Veres, D, Hutchinson, SM, Braun, M, Timar-Gabor, A, Astalos, C, Mosburgger, V & Hickler, T 2015, 'Origin of the forest steppe and exceptional grassland diversity in Transylvania (central-eastern Europe)', Journal of Biogeography, vol. 42, no. 5, pp. 951-963. https://doi.org/10.1111/jbi.12468
Feurdean, Angelica ; Marinova, Elena ; Nielsen, Anne B. ; Liakka, Johan ; Veres, Daniel ; Hutchinson, Simon M. ; Braun, M. ; Timar-Gabor, Alida ; Astalos, Ciprian ; Mosburgger, Volker ; Hickler, Thomas. / Origin of the forest steppe and exceptional grassland diversity in Transylvania (central-eastern Europe). In: Journal of Biogeography. 2015 ; Vol. 42, No. 5. pp. 951-963.
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AU - Veres, Daniel

AU - Hutchinson, Simon M.

AU - Braun, M.

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N2 - Aim: The forest steppe of the Transylvanian Plain is a landscape of exceptionally diverse steppe-like and semi-natural grasslands. Is this vegetation a remnant of a once continuous temperate forest extensively cleared by humans, or has the area, since the last glacial, always been a forest steppe? Understanding the processes that drive temperate grassland formation is important because effective management of this biome is critical to the conservation of the European cultural landscape. Location: Lake Stiucii, north-western Romania, central-eastern Europe. Methods: We analysed multi-proxy variables (pollen, coprophilous fungi, plant macroremains, macrocharcoal) from a 55,000 year discontinuous sequence (c. 55,000-35,000; 13,000-0 cal. yr bp), integrating models of pollen-based vegetation cover, biome reconstruction, global atmospheric simulations and archaeological records. Results: Needleleaf woodland occurred during glacial Marine Isotope Stage (MIS) 3, but contracted at the end of this period. Forest coverage of c. 55% (early Holocene) and 65% (mid-Holocene) prevailed through the Holocene, but Bronze Age humans extensively cleared forests after 3700 cal. yr bp. Forest coverage was most widespread between 8600 and 3700 cal. yr bp, whereas grasses, steppe and xerothermic forbs were most extensive between 11,700 and 8600 cal. yr bp and during the last 3700 cal. yr bp. Cerealia pollen indicate the presence of arable agriculture by c. 7000 cal. yr bp. Main conclusions: We have provided the first unequivocal evidence for needleleaf woodland during glacial MIS 3 in this region. Extensive forests prevailed prior to 3700 cal. yr bp, challenging the hypothesis that the Transylvanian lowlands were never wooded following the last glaciation. However, these forests were never fully closed either, reflecting dry growing season conditions, recurrent fires and anthropogenic impacts, which have favoured grassland persistence throughout the Holocene. The longevity of natural and semi-natural grasslands in the region may explain their current exceptional biodiversity. This longer-term perspective implies that future climatic warming and associated fire will maintain these grasslands.

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