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Stratification strength and light climate explain variation in Chlorophyll a at the continental scale in a European multilake survey in a heatwave summer
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SYSNO ASEP 0555170 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stratification strength and light climate explain variation in Chlorophyll a at the continental scale in a European multilake survey in a heatwave summer Author(s) Fránková, Markéta (BU-J) RID, ORCID Number of authors 193 Source Title Limnology and Oceanography. - : Wiley - ISSN 0024-3590
Roč. 66, č. 12 (2021), s. 4314-4333Number of pages 20 s. Language eng - English Country US - United States Keywords chlorophyll-a ; climatic zones ; nutrients Subject RIV DA - Hydrology ; Limnology OECD category Marine biology, freshwater biology, limnology Method of publishing Open access Institutional support BU-J - RVO:67985939 UT WOS 000712815100001 EID SCOPUS 85118408152 DOI 10.1002/lno.11963 Annotation To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L-1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature anomaly from the long-term average, during a summer heatwave was the highest (+4 degrees C) and showed a significant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient concentrations and surface temperature. Workplace Institute of Botany Contact Martina Bartošová, martina.bartosova@ibot.cas.cz, ibot@ibot.cas.cz, Tel.: 271 015 242 ; Marie Jakšová, marie.jaksova@ibot.cas.cz, Tel.: 384 721 156-8 Year of Publishing 2022 Electronic address https://doi.org/10.1002/lno.11963
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