Data from: Unexpected shift from cyanobacterial to dinoflagellate dominance due to a summer drought
Data files
Jan 27, 2025 version files 54.61 KB
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EW_Data_All_dryad.xlsx
52.39 KB
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README.md
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Abstract
The ruling paradigm is that future climate change scenarios will lead to an increase in the frequency, intensity, and duration of cyanobacterial blooms across the globe. It was therefore unexpected when, during an unusually warm and dry summer in southern Sweden in 2018, cyanobacteria did not dominate the phytoplankton community of the temperate Lake Vombsjön known for toxic cyanobacterial blooms. Instead, a potentially toxic dinoflagellate, Naiadinium polonicum, formed a large bloom and was dominant for the entire season. Dinoflagellates share important functional traits with cyanobacteria, but few studies have considered competition between dinoflagellates and cyanobacteria under future climate change scenarios. In order to understand the underlying factors leading to the N. polonicum bloom in 2018, we designed a study of Lake Vombsjön for an additional two years. When compared with subsequent years, 2018 was defined by an extended period of thermal stratification and hypoxia near the sediment surface. A significant positive relationship was also identified between N. polonicum biomass and both surface water temperature and soluble reactive phosphorus. We, therefore, suggest that the combination of higher temperatures and higher water column stability benefitted N. polonicum more so than cyanobacteria. Given that these factors are generally associated with cyanobacterial success, we conclude that freshwater phytoplankton community composition in temperate lakes can take different pathways in a warmer world.
README: Data from: Unexpected shift from cyanobacterial to dinoflagellate dominance due to a summer drought
Description of the data and file structure
Data in file ‘EW_Data_All’ is presented in the order it appears in the manuscript, see below for more information. Data for Table 3 falls under the license CC BY and can therefore only be found in the following repository: https://github.com/SJean99/Plankton-LakeVombsjon-Scania/tree/main.
Sheets in excel file ‘EW_Data_All:
Table1: Combined surface water temperature from our own sampling and from Sydvatten
Table2: Temperature (surface and bottom), DO (bottom) and RWCS from Sydvatten
Table3: Monthly average outflow and cumulative precipitation from SMHI (available at https://github.com/SJean99/Plankton-LakeVombsjon-Scania/tree/main)
Table4: Nutrient data
Table5: Chlorophyll-a (fluorometry) and phytoplankton community composition (AlgaeLabAnalyser)
Table6: Cyanobacteria and dinoflagellate biomass
Table7: Zooplankton biomass
Table8: Results from principal component analysis with environmental variables
Table9: Results from principal component analysis with zooplankton variables
Table10: AUC (Area under the curve) calculations
Table11: Results from Multiple Linear Regression analysis with model averaging
Relevant abbreviations:
(C): degrees celsius
mg ww/L: milligrams wet weight per litre (see manuscript for description)
mg dw/L: milligrams dry weight per litre (see manuscript for description)
AUC: area under the curve
RWCS: Relative water column stability
DO: dissolved oxygen
SRP: soluble reactive phosphorus
NA: Not available. Both NA and empty cells indicate that corresponding data was not collected and/or analysed for that specific sampling occasion.
Some data used in statistical analyses (precipitation, outflow and radiation) have the licence CC BY and are therefore being housed, together with the associated R-scripts used for the statistical analyses, at https://github.com/SJean99/Plankton-LakeVombsjon-Scania/tree/main.