Regulation effect in river Nea

Markus Majaneva

doi:10.15468/c9rsg7

Regulation effect in river Nea

Citation

Majaneva M (2023). Regulation effect in river Nea. Version 1.1. Norwegian Institute for Nature Research. Sampling event dataset https://doi.org/10.15468/c9rsg7 accessed via GBIF.org on 2024-12-12.

Description

The aim of the project was to assess the effect of regulation and weirs on diversity of river benthic macroinvertebrates. Macroinvertebrates were sampled by four-minute kick-net sampling, using a 500-µm net. Samples were collected in spring and autumn 2019 from 19 stations along a 29-km reach of a the river Nea, between the lakes Heggsetsjøen and Selbusjøen. Samples were collected incloste to the weirs, one sample upstream a weir in a stationary part and one sample downstream a weir in a rapid. The samples were taken by holding the net downstream and kicking up the substrate while backing upstream. In stationary parts, the net was moved from side to side in front of the kicking feet to catch the material that was swirling up. All benthic groups were determined at the lowest possible taxonomic level and number of specimens was counted. Two different biological quality indices were calculated for the study reach to assess the ecological status of the river.

Sampling Description

Study Extent

River Nea, municipalities of Tydal and Selbu in Trøndelag county, Norway

Sampling

Benthic macroinvertebrate samples from 19 stations in June and October 2019, using a 500-µm kick-net were collected. Sampling stations were chosen close to the weirs, where one station was downstream of the weir in a fast-flowing part of the river (rapids) and one station was upstream of the weir in a stationary part of each weir pool. The samples were taken by holding the net downstream and kicking up the substrate while backing upstream. In stationary parts, the net was moved from side to side in front of the kicking feet to catch the material that was swirling up. Different instream habitats were sampled proportionally to their existence in the stations following standardized methodology. Four-minute kick samples were collected to reach reliable measures of biodiversity.

Method steps

Samples were picked partly fresh and partly preserved in ethanol and all benthic groups were determined at the lowest possible taxonomic level and number of specimens was counted by an expert with over 30 years of experience in benthic macroinvertebrate analyses in the area.

Taxonomic Coverages

N/A

Coleoptera
rank: order
Mollusca
rank: phylum
Arthropoda
rank: phylum
Leuctridae
rank: family
Insecta
rank: class
Diptera
rank: order
Elmidae
rank: family
Heptageniidae
rank: family
Polycentropodidae
rank: family
Trichoptera
rank: order
Ameletidae
rank: family
Arctopsychidae
rank: family
Limnephilidae
rank: family
Lymnaeidae
rank: family
Chironomidae
rank: family
Ephemerellidae
rank: family
Nemouridae
rank: family
Hydroptilidae
rank: family
Animalia
rank: kingdom
Baetidae
rank: family
Incertae sedis
rank: order
Ephemeroptera
rank: order
Perlodidae
rank: family
Plecoptera
rank: order
Rhyacophilidae
rank: family
Tipulidae
rank: family
Gastropoda
rank: class
Simuliidae
rank: family
Arachnida
rank: class

Geographic Coverages

River Nea, municipalities of Tydal and Selbu in Trøndelag county, Norway

Bibliographic Citations

Contacts

Markus Majaneva
originator
position: Researcher
Norwegian Institute for Nature Research
NO
email: markus.majaneva@nina.no
userId: https://orcid.org/0000-0003-3884-2548

Markus Majaneva
metadata author
position: Researcher
Norwegian Institute for Nature Research
NO
email: markus.majaneva@nina.no
userId: https://orcid.org/0000-0003-3884-2548

Markus Majaneva
administrative point of contact
position: Researcher
Norwegian Institute for Nature Research
NO
email: markus.majaneva@nina.no
userId: https://orcid.org/0000-0003-3884-2548