The Global Population Dynamics Database is the largest collection of animal and plant population data in the world, bringing together nearly five thousand time series in one database. Sources of data vary enormously, from annual counts of mammals or birds at individual sampling sites, to weekly counts of zooplankton and other marine fauna.
More information on this dataset can be found in the Freshwater Metadatabase - BFE_64 (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BFE_64).