Nutrient availability affected shallow-lake ecosystem response along the Late-Glacial/Holocene transition
Autor: | Petra Houfková, Anna Tichá, Vlasta Jankovská, Daniel Vondrák, Tomáš Bešta |
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Rok vydání: | 2019 |
Předmět: |
0106 biological sciences
biology Ecology 010604 marine biology & hydrobiology fungi Aquatic Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Nutrient Diatom Environmental science Sedimentary rock Glacial period Eutrophication Relative species abundance Holocene Trophic level |
Zdroj: | Hydrobiologia. 846:87-108 |
ISSN: | 1573-5117 0018-8158 |
DOI: | 10.1007/s10750-019-04054-7 |
Popis: | 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. |
Databáze: | OpenAIRE |
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