Realm: Freshwater
Climate: Temperate
Biome: Large river ecosystems
Central latitude: 57.753096
Central longitude: 21.409451
Duration: 26 years, from 1983 to 2015
1911 records
317 distinct species
Across the time series
Chironomidae is the most frequently occurring species
Methods
Salaca is a 95 km long river (catchment area of 3415 km2) in northern Latvia, Vidzeme. Salaca is anthropogenically little affected river that is situated in the North Vidzeme Biosphere Reserve, flows from hypereutrophic Lake Burtnieks to the Gulf of Riga. In the drainage basin natural territories are dominating: forests (59 %), bogs (4 %) and waterbodies (2 %), arable lands are 34 %, and urban territories (1%) from the drainage area. Three sites were recorded: Vecate, Mazsalaca, and Vecsalaca. Samples were taken between 1968 - 2015. The publication authours used density ( Individuals per m2) as a measure of abundance. At potamal type upper reaches: Vecate and Skanais kalns benthic invertebrate samples were taken by Ekman grab sampler (sampling area of 0.025 m2) (in Vecate: 2 replicates close to both rivers banks and 2 replicates in the middle part of river (in total 6 replicates; 0.15 m2); in Skanais kalns: 2 replicates close to both rivers banks (in total 4 replicates; 0.1 m2)). At riffle section in Vecsalaca (lower reaches) samples were taken with Surber sampler (sampling area of 0.0625 m2) (in total 3 replicates; 0.19 m2 (2m, 15m and 35 m form right river bank)).
Citation(s)