Artificial substrate

Average dissimilarity = 39.97

Control

Impacted

Species

Av.Abund

Av.Abund

Av.Diss

Diss/SD

Contrib%

Cum.%

Amphora pediculus (Kützing) Grunow

4.58

2.82

2.75

1.52

6.88

6.88

Nitzschia inconspicua Grunow

2.85

2.69

1.54

1.01

3.86

10.74

Rhoicosphenia abbreviata (C. Agardh) Lange-Bertalot

1.36

2.16

1.27

1.32

3.17

13.91

Nitzschia palea (Kützing) W. Smith

0.82

1.15

1.17

1.2

2.93

16.85

Cocconeis placentula var. trilineata (Peragallo & Héribaud) Cleve

1.78

2.33

1.13

1.33

2.83

19.68

Achnanthidium minutissimum (Kützing) Czarnecki

1.69

1.11

1.05

1.23

2.62

22.29

Amphora copulata (Kützing) Schoeman & Archibald

2.15

2.24

1.04

1.4

2.61

24.91

Gomphonema rhombicum M. Schmidt

1.35

1.49

1

1.33

2.51

27.41

Navicula cryptotenella Lange-Bertalot

2.12

1.7

0.99

1.29

2.48

29.89

Amphora ovalis (Kützing) Kützing

0

0.91

0.95

1.06

2.37

32.27

Navicula antonii Lange-Bertalot

1.64

1.01

0.93

1.09

2.32

34.58

Cocconeis placentula Ehrenberg var. placentula

2.11

1.87

0.92

1.44

2.3

36.88

Gomphonema minutum (C. Agardh) C. Agardh

1.11

1.44

0.88

1.18

2.21

39.09

Navicula tripunctata (O. F. Müller) Bory

0.39

1.15

0.87

1.37

2.18

41.27

Cocconeis placentula var. lineata (Ehrenberg) Van Heurck

2.75

2.57

0.83

1.3

2.07

43.34

Nitzschia amphibia Grunow

1.51

1.47

0.78

1.43

1.96

45.3

Amphora indistincta Levkov

1.2

0.51

0.78

1.51

1.95

47.26

Gomphonema parvulum (Kützing) Kützing

0.41

0.9

0.78

1.04

1.94

49.2

Pleurosira laevis (Ehrenberg) Compère

0.32

0.99

0.77

1.41

1.93

51.13