Table 2 Macroinvertebrate mean abundances (ind/m²; SD in parentheses) in three analyzed habitat types

Hydra vulgaris

–

30 (74)*

–

Nematoda

–

5 (18)

3 (8)

Turbellaria undet.

15 (26)

78 (105)*

6 (12)

Planaria torva

–

1 (3)

1 (2)

Erpobdella octoculata

117 (169)

242 (276)

357 (1,117)

Glossiphonia complanata

8 (20)

212 (456)*

6 (12)

G. concolor

–

65 (167)*

–

G. heteroclita

58 (143)

459 (1,206)*

18 (43)

Helobdella stagnalis

111 (140)

49 (59)

630 (2,361)

Oligochaeta

3,382 (2,914)

3,516 (3,566)

2,790 (3,749)

Eiseniella tetraedra

13 (30)

31 (42)

11 (27)

Marenzelleria neglecta

5 (17)

–

2 (6)

Dreissena polymorpha

87 (134)

2,741 (4,537)*

98 (139)

Pisidium spp.

356 (437)

103 (128)

151 (328)

Sphaerium spp.

9 (15)

8 (24)

6 (12)

Unionidae

5 (7)

8 (24)

3 (7)

Bithynia tentaculata

5 (10)

1 (3)

12 (32)

Lithoglyphus naticoides

–

2 (3)

1 (3)

Radix ovata

–

–

1 (2)

Theodoxus fluviatilis

–

7 (24)

1 (7)

Valvata piscinalis

157 (289)

10 (19)

103 (236)

V. pulchella

2 (6)

1 (3)

1 (4)

Viviparus viviparus

–

10 (24)

3 (5)

Argyroneta aquatica

–

–

1 (3)

Hydrachnellae

8 (18)

26 (50)

7 (28)

Ostracoda

92 (253)

517 (1,186)

41 (72)

Asselus aquaticus

2 (6)

171 (234)*

1 (2)

Chelicorophium curvispinum

–

–

1 (2)

Ch. multisetosum

–

109 (362)

13 (61)

Ch. volutator

–

3 (10)

–

Chaetogammarus warpachowskyi

14 (22)

1 (3)

6 (14)

Pontogammarus crassus

5 (16)

1 (3)

5 (15)

Pontogammarus robustoides

5 (12)

1 (3)

4 (17)

Gammaridae undet.

9 (26)

–

3 (9)

Corixidae

–

2 (5)

1 (3)

Argulus foliceus

–

–

1 (3)

Musidae

–

–

1 (2)

Chironomidae

1,685 (1,164)

1,347 (944)

1,098 (1,507)

Trichoptera

7 (13)

12 (23)

6 (10)