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{"Abstract":["Data accompanying the paper Szydlowski et al. "Macrophyte and snail community responses\n to 30 years of population declines of invasive rusty crayfish (Faxonius rusticus)."\n Macrophytes and snails were sampled in ten lakes in Vilas County, Wisconsin, USA during\n summer sampling events in 1987, 2002, 2011, and 2020. Lakes had varying levels of invasion\n by F. rusticus, which affected measures of macrophytes and snails. Macrophytes were sampled\n using a point-intercept transect method and snails were sampled using different sampler\n types which were dependent on substrate. Macrophytes were sampled at 6-14 sites per lake and\n snails were sampled at 16-31 sites per lake. Crayfish were regularly sampled at either 24 or\n 36 sites per lake between 1987 and 2020. Overall, this dataset provides abundance and\n richness data for over 25 species of snails and over 40 species of macrophytes in 10 north\n temperate lakes."]} 

ABSTRACT MotivationHere, we make available a second version of the BioTIME database, which compiles records of abundance estimates for species in sample events of ecological assemblages through time. The updated version expands version 1.0 of the database by doubling the number of studies and includes substantial additional curation to the taxonomic accuracy of the records, as well as the metadata. Moreover, we now provide an R package (BioTIMEr) to facilitate use of the database. Main Types of Variables IncludedThe database is composed of one main data table containing the abundance records and 11 metadata tables. The data are organised in a hierarchy of scales where 11,989,233 records are nested in 1,603,067 sample events, from 553,253 sampling locations, which are nested in 708 studies. A study is defined as a sampling methodology applied to an assemblage for a minimum of 2 years. Spatial Location and GrainSampling locations in BioTIME are distributed across the planet, including marine, terrestrial and freshwater realms. Spatial grain size and extent vary across studies depending on sampling methodology. We recommend gridding of sampling locations into areas of consistent size. Time Period and GrainThe earliest time series in BioTIME start in 1874, and the most recent records are from 2023. Temporal grain and duration vary across studies. We recommend doing sample‐level rarefaction to ensure consistent sampling effort through time before calculating any diversity metric. Major Taxa and Level of MeasurementThe database includes any eukaryotic taxa, with a combined total of 56,400 taxa. Software Formatcsv and. SQL.