Physicochemical and biological variables measured in 110 national monitoring lakes between 1992 and 2022.
Physicochemical and biological data 110 national monitoring lakes for the years 1992 to 2022 were downloaded from the data host https://miljodata.slu.se/MVM/. Climate data were extracted from Climate Research Unit gridded Time Series dataset (version 4.06; Harris et al., 2020; https://crudata.uea.ac.uk/cru/data/hrg/) Eight data sets were compiled: 1. Physicochemical variables from surface water samples (10 variables): EU id Year Colour_absorbance_420nm Ca mg/l Conductivity_mS/m pH TOC mg/l C DIN_ µg/l_N TP_ µg/l_P Water_Temperature_°C. Lake physicochemical and climate data were log10(x + 1) transformed to approximate normal distribution prior to the analyses. 2. Climate data: annual mean air temperature (°C) and precipitation (mm per month for each lake in each year) extracted from the interpolated Climate Research Unit gridded Time Series dataset (version 4.06; Harris et al., 2020; https://crudata.uea.ac.uk/cru/data/hrg/) 3. Phytoplankton taxon abundances (biovolumes) for individual taxa collected in August (n = 780 taxa). Biovolumes were Hellinger transformed. 4. Phytoplankton metrics (n=5): number of taxa, taxon biovolumes, diversity (Hills N2), % cyanobacteria and between-year Euclidean distance*. 5. Littoral taxon abundances (numbers per unit effort) for samples collected in October/November (n=681 taxa). Abundances were Hellinger transformed. 6. Littoral metrics (n=4): number of taxa, total abundance, diversity (N2) and between-year Euclidean distance 7. Profundal taxa abundances (individual per m2) for samples collected in October/November (n=321 taxa). Abundances were Hellinger transformed. 8. Profundal metrics (n=4): number of taxa, total abundance, diversity (N2) and between-year Euclidean distance. * Between-year Euclidean distances were calculated using detrended correspondence analysis axes 1-3 as as d=√((x2 – x1)² + (y2 – y1)²) + (z2 – z1)²), where x1, y1, z1 represent DC axis scores one, two and three, respectively, at any year and x2, y2, z2 represent DC axis scores one, two and three, respectively, for the previous year.
Johnson, R.K., Goedkoop, W., Lau, D. (2025). Multi-decadal trends in Northern lakes show contrasting responses of phytoplankton and benthic macroinvertebrates to climate change. Global Change Biology, http://dx.doi.org/10.1111/gcb.70274
Swedish University of Agricultural Sciences
Department of Aquatic Sciences and Assessment
The Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management financed these long-term monitoring programmes.
Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management.
Environmental resources, protection and conservation.
Inland water features, drainage systems and their characteristics.
A considerable inland body of standing water.
The scientific study or the characteristic life processes of living organisms found in a natural body of water that does not contain significant amounts of dissolved salts and minerals, such as a lake or river.
The living organisms and nonliving materials of an inland aquatic environment.
[Henderson's] a. pert. or living in water con­taining less than 0.5 parts per thousand dissolved salt (sodium chloride), such as that in rivers, ponds and lakes. cf. brackish water, seawater.
[ENVO] An process in which environmental parameters and variables are continually assayed.
Location and operation of environmental monitoring facilities includes observation and measurement of emissions, of the state of environmental media and of other ecosystem parameters (biodiversity, ecological conditions of vegetation, etc.) by or on behalf of public authorities.
bicosoeca planctonica var. multiannulata
cyclotella bodanica var. lemanensis f. borealis
plagioselmis lacustris p. nannoplanctica
pseudopediastrum boryanum var. longicorne
staurodesmus megacanthus var. subcurvatus
staurodesmus triangularis var. limneticus
tabellaria flocculosa var. asterionelloides
platycnemis pennipes pyrrhosoma nymphula
platycnemis pennipes/pyrrhosoma nymphula