Journal
HYDROBIOLOGIA
Volume 846, Issue 1, Pages 87-108Publisher
SPRINGER
DOI: 10.1007/s10750-019-04054-7
Keywords
Central Europe; Diatoms; Chironomids; Pollen; Lake ontogeny; Climate change
Categories
Funding
- Czech Science Foundation [GAR 19-05791S, GAR 17-05935S]
- Ministry of Education Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/20.0289-PAPAVER]
Ask authors/readers for more resources
Shallow lowland lakes undergo long-lasting natural eutrophication processes, which can be studied through the development of communities of aquatic organisms. However, records showing millennial-scale trophic status variability in these water bodies are rare. Two radiocarbon-dated sedimentary profiles from former (now destroyed by brown coal mining) Lake Komoany (Central Europe, Czech Republic) served for a multi-proxy study of biological remains (diatoms, chironomids, pollen) supplemented by X-ray fluorescence (XRF) and loss-on-ignition (LOI). The age-depth model and palynostratigraphy confirm a continuous Late-Glacial to Early-Holocene record. The results suggest consistent in-lake conditions with high nutrient availability since the lake origin in the Late-Glacial period. A distinct shift at the Late-Glacial/Holocene boundary evidenced by an enhancement in diatom valve concentration and a lithological interface was foregone by a qualitative change in diatom and chironomid assemblages along with rise in LOI. It suggests that a major transformation occurred before the onset of the Holocene. As this qualitative change was characterized by a decrease in relative abundance of nutrient-demanding species, we propose an indirect climatic control by means of nutrient availability as the main driver of the aquatic species composition.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available