Monitoring macroinvertebrater in Norwegian rivers?

Torleif Bækken , NIVA

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prøvenummer 1-680

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PT

Data in database (NIVA base) relative to ASPT

Potential ref. sites,but where and type?

EPT ØST-Tr EPT SørVest EPT NordNorge

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Data in database (NIVA base) relative to EPT species

Eutrophicated rivers

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RN1 RN2 RN3 RN4 RN5 RN6 RN7 RN8*

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The initial intercalibration selectionon river types

Reference intercalibration data?

Norway with sufficient data on two types: R-N1 and R-N4

R-N1 and R-N4 (lowland types) 52 sites inkluding 9 reference sites

Ongoing monitoring of rivers

Monitoring Norwegian reference rivers: Atna (mountain-boreal), Vikedalselva (acidification, montain-boreal-lowland).

Monitoring liming/acidification: several rivers at the south and west of Norway. Some few in the north and east.

Oslo rivers pollution monitoring (very 2-5 years), some ”references”?

Almost all other Norwegian invertebrate data is from short time point source monitoring.

Lack of additional data to define reference conditions

Methods

Sampling: mostly 3x1 min kick, some 5x1 min, 1x1 min, some with no time frame.

Sorting: no systematic common approach (NIVA: subsampling, counting all in 1. subsample, then the less common (< 20) in next samples, all subsamples to look for species in few numbers.)

Taxa level: All to main groups, EPT to species, elmiidae to species and few other groups.

Sampling frequency: 1-2 times/year (prefer autumn)

Classification

No national system (or under development?)

Raddum (national monitoring acidification/liming), NIVA (regional east)

ASPT (depending on institution/person)

EPT (depending on institution/person)

Trent modified (Oslo rivers)

Supporting information

Acidification: pH, alk, and most anions and cations

Other monitored variables depend on the purpose

Problem: when chemical variables and macroinvertebrates have been monitored in the same program (acidification/liming), there have often been lack og coordination in time and site.