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Table 3 Macroinvertebrate composition, distribution, and community structure in Opa Reservoir’s tributaries (September 2004–July 2005)

From: Biological assessment of the headwater rivers of Opa Reservoir, Ile-Ife, Nigeria, using ecological methods

S/N

Taxon

Obudu River

Opa River

Esinmirin River

 

Crustacea

1

Sudanonautes africanus

113

106

89

 

Insecta

2

Elassoneuria sp.

123

18

6

3

Aciagrion hamoni

0

18

0

4

Lestinogomphus sp.

148

36

30

5

Urothermis assignata

118

44

88

6

Acisoma panorpoides

159

59

18

7

 Diptera 1

6

0

0

8

 Diptera 2

6

0

0

9

Chironomus sp.

6

0

58

10

Eristalis sp.

6

0

6

 

Gastropoda

11

Lanistes libycus

90

24

36

12

Potadoma moerchi

18

18

0

13

Potadoma freethi

12

83

889

14

Melanoides tuberculata

142

48

439

15

Bulinus globosus

0

0

93

16

Tagelus plebeius

0

12

12

 

Annelida

17

Tubifex sp.

47

0

0

Taxa richness

14

11

12

Abundance

994

466

1764

Margalef diversity index

1.884

1.628

1.472

Shannon-Wiener index

2.225

2.185

1.527

Pielou’s evenness index

0.661

0.808

0.384