Realm: Freshwater
Climate: Polar/Temperate
Biome: Small river ecosystems
Central latitude: 61.909248
Central longitude: 10.176878
Duration: 15 years, from 2003 to 2017

3413 records

98 distinct species

Across the time series Chironomidae is the most frequently occurring species

Methods

Drawn from a translation of the report titled "Lange tidsserier i Atna- og Vikedalsvassdragene - Resultater 2020" published by NINA https://hdl.handle.net/11250/2761393. The benthic surveys in Atna have been ongoing every year since 1986, and therefore represent one of the longest data series on benthic animals from unaffected waterways in Norway (Aagaard et al. 2004). From 2003, samples have been taken at four fixed stations: Vidjedalsbekken, Dørålseter, Vollen and Solbakken (figure 2.2.1). In 2020, the samples at station Vollen were taken upstream of the former station. Different benthic species have different life cycles, and in order to record as many species as possible, repeated sampling throughout the ice-free season is therefore necessary. At each station, kicking samples of 4 minutes duration are taken on three dates throughout the season. Every year, an attempt is made to reach the highest stations as soon as they are available. If possible, hoofing is also carried out in the vegetation to find adult individuals of mayflies, stoneflies and springflies. The samples are processed in the laboratory following a subsampling procedure where benthic animals are picked and identified until no new groups or species of benthic animals are detected. In each sample, the total number of individuals belonging to each taxa (species, genus, family or order) is determined by multiplying and summing based on the number of individuals of each taxa in the subsamples that have been counted

Citation(s)

@Dataset{BioTIME_cit343, Study_id = {578}, Citation_id = {343}, Author = {Bongard, Terje and Jensen, Thomas and B{\ae}kkelie, Knut Andreas Eikland}, Publisher = {eLTER}, Title = {Benthic invertebrates at four sites along the Atna river - Norway. 2003-2017}, Year = {2020}, Doi = {10.23728/b2share.d57da19440ad43ba90f3e50ae6402c3a}, Url = {doi.org/10.23728/b2share.d57da19440ad43ba90f3e50ae6402c3a}, Language = {English} }