(1,1) -1- Poster_EGU_land
Benthic invertebrates as ecological indicators of impounded rivers Otto Moog, Ilse Stubauer & Patrick Leitner River Traun,, Au ugu ust 200 08
1 Introduction & Aims
3 Methods
5 Discussion
Austrian Multimetric Index (MMI) 0,9 0,8 0,6
WEIR
The e databa ase reflflects the exxperien nces of the lasst five e yea ars biomon nitoring within the imp plemention of the e EU Water Framewo ork Directive. Samples have been taken fo ollowing g the multi-h habita at-sam mpling princcipless. Sha allow watter bodie es have e been n samp pled with a stand dard EU-ha andne et (m mesh size 500 0 μm, 20 0 samp pling units pe er investigation site). Large er imp pound ded rivers havve been sample ed with h an aiirlift-s sample er (15 5 replicatess per crosss section).
0,7 0,5 0,4 0,3 0,2 0,1 0 SI(Zelinka&Marvan)
2,18
2,21
2,14
2,26
2,9
2,72
ECOLOGICALSTATUS(detailedMZBͲmethod)
good
poor
poor
bad
bad
bad
Environmentalcharacteristics Gravel/Pebbles
Bedsediment Currentvelocity[m/s]
The e benthicc inverte ebrate e fauna a was docum mente ed at 4 to 6 inve estiga ation sites along an im mpoundment’ss gradiient fro om an n unim mpaire ed sitte, to the free flowing headracce sectiion an nd 1 to o 4 site es with difffering distan nces to the we eir. In tota al 24 inv vestiga ation sites from 5 diffferentt rivers ha ave been analyysed.
Depths[m] Distancetoweir[m] Biologicalmetrics Speciesrichness(total#taxa) EPTͲtaxa Litoral&profundal Grazers&shreddersquotient(RETI) Filtering&gatheringcollectorsquotient(PETI)
Mud/Sand
Mud
0,4
0,3
0,2
0,16
0,11
0,05
3,6 10.000
5,6 8.000
8,8 6.000
10,2 4.000
10,1 2.000
12,8 200
105,00 23,00 1,49 0,58 0,42
79,00 11,00 2,39 0,22 0,78
63,00 10,00 2,87 0,14 0,86
71,00 4,00 3,82 0,09 0,91
41,00 0,00 3,81 0,00 1,00
30,00 1,00 4,14 0,01 0,99
2119,1
2115,6
River Dan nub be, Ma ay 200 06
Screening Taxa 40
The e benthicc inverttebrate e comm munitie es (sp peciess list plus corre esponding individual abun ndancess) of each site were used to ca alculatte the e sett of metricss that iss curren ntly uttilized to asssess the ecolog gical status of riverrs in Ausstria (De etailed Metho od and d Scre eening g Metthod, Ofen nböck et al. 2010).
35 30 25
WEIR
Airlift--Samp pling g at Rive er Dona au
Airlift--Samp pling g arr Rive er Traun
Beforeweir
Impoundment
WEIR
Headrace
20 15 10 5
4 Results
0
rkm rkm 2127,8 Screeningmetrics Sensitivetaxa DegradationsͲscore SabrobicͲscore ECOLOGICALSTATUS(Screeningmethod)
2126,05
2122,5
2122,0
9
7
1
3
9
9
48
40
7
21
43
39
103,11
107,75
102,31
105
108,86
106,34
good
needfor action
needfor action
needfor action
good
good
Beforeweir
Headrace
Headrace
Environmentalcharacteristics Headrace
Callop pterr yx virg go
2 Study Area
Cobbles
Sand/Gravel
Sand/Gravel
Sand/Gravel
Gravel/Sand
Cobbles
1,1
0,7
0,6
0,4
1,5
0,8
6,1
7,2
9,8
10,5
5,5
6
2127,8
2126,1
2122,5
2122,0
2119,1
2115,6
8300
6550
3000
2500
Ͳ400
Ͳ3900
23
7
1
4
19
18
0,9741
3,132
1,3
5,8776
0,3902
0,5068
1,5718
0,487
0,3333
0,481
0,6715
2,1219
0,3325
0,4488
0,2266
0,1782
0,1119
0,32
0,6675
0,5512
0,7734
0,8218
0,8881
0,68
Summary River Wa alda aist, Ju uly 200 00 Correlations
Re eferences
Sa ampling sites att Rive er Dan nube, Traun n, Wa aldaisst, Na aarn & Ka amp
Offenböckk, T., Moog g, O., Hartm mann n, A. & Stuba auer, I. (2 2010 0): Le eitfaden n zur Erheb bung der Biolog gisch hen Qualitätselem mentte, Te eil A2 – Makro ozoo obenth hos. Bund desm ministterium m für Landun nd Forsttwirtscchaft, Umw welt und Wassserw wirtscchaftt. 211 1 pp p.
BOKU - University of Natural Resources and Life Sciences, Vienna, Austria Working Group on Benthic Ecology and Ecological Status Assessment
[email protected]
pH SRP TP NO3N NO3-N Ca Mg SBV Hardness Chlorid Max. width Mean width % Riparian vegetation Temperature % Shading Conductivity [μS] Oxygen saturation [%] % Fine sediment Current velocity [m/s] Max. depths [m]
Distance to weir Pearson Correlation Sig. (2-tailed) -,298 ,347 -,177 ,582 -,096 ,767 ,091 ,779 ,255 ,425 -,138 ,669 -,100 ,758 ,199 ,535 ,121 ,707 ,074 ,820 ,000 1,000 ,483 ,112 ,012 ,972 ,343 ,275 -,121 ,709 -,073 ,822 -,878** ,000 ,791** ,002 -,711** ,010
**. Correlation is significant at the 0.01 level (2-tailed).
WEIR
Bedsediment Currentvelocity[m/s] Waterdepths[m] Riverkilometer[rkm] Distancetoweir[m] Biologicalmetrics EPTͲtaxa AFIL PFIL Grazers&shreddersquotient(RETI) Filtering&gatheringcollectorsquotient(PETI)
Impoundment
Corrbicculla flflum min nea
Bae etiis sp p.
Hyd dropsycche sp.
Dikero ogam mma aruss viillossus
