Nutrient availability affected shallow-lake ecosystem response along the Late-Glacial/Holocene transition

0517492 - BC 2020 RIV NL eng J - Článek v odborném periodiku
Tichá, A. - Bešta, Tomáš - Vondrák, D. - Houfková, P. - Jankovská, Vlasta
Nutrient availability affected shallow-lake ecosystem response along the Late-Glacial/Holocene transition.
Hydrobiologia. Roč. 846, č. 1 (2019), s. 87-108. ISSN 0018-8158. E-ISSN 1573-5117
Grant CEP: GA ČR(CZ) GA17-05935S; GA ČR(CZ) GA19-05791S
Institucionální podpora: RVO:60077344 ; RVO:67985939
Klíčová slova: Central Europe * chironomids * climate change * diatoms
Obor OECD: Marine biology, freshwater biology, limnology; Ecology (BU-J)
Impakt faktor: 2.385, rok: 2019
Způsob publikování: Omezený přístup
https://link.springer.com/article/10.1007%2Fs10750-019-04054-7

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 Komořany (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.
Trvalý link: http://hdl.handle.net/11104/0302831