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Ecological Processes

Table 3 T-test comparisons of species richness (S), Shannon-Wiener diversity (H′ max), species evenness (E), standardized species richness (M), and Simpson’s dominance (D) index values between pre-carp (2002) and post-carp (2017) periods in lower White River oxbow lakes

From: Comparisons of oxbow lake fish assemblages in relation to bigheaded carp establishment in the lower White River, Arkansas

Assemblage variables

2002

(Pre-carp)

Mean (± SE)

2017

(Post-carp)

Mean (± SE)

P

Gears pooled and averaged across lakes:

   

H′

2.25 ± 0.17

2.43 ± 0.15

0.295

H′max

3.61 ± 0.23

3.70 ± 0.03

0.016

E

0.62 ± 0.05

0.66 ± 0.04

0.480

S

37 ± 2

41 ± 1

0.015

M

0.98 ± 0.09

1.08 ± 0.05

0.268

D

0.80 ± 0.06

0.81 ± 0.04

0.859

By gear averaged across lakes

   

Electrofishing

   

H′

2.29 ± 0.06

2.64 ± 0.04

 < 0.001

H′max

3.26 ± 0.03

3.48 ± 0.04

 < 0.001

E

0.70 ± 0.02

0.76 ± 0.01

0.032

S

26 ± 1

33 ± 1

 < 0.001

M

0.85 ± 0.03

1.34 ± 0.07

 < 0.001

D

0.82 ± 0.02

0.88 ± 0.01

0.007

Mini-Fyke Nets

   

H′

1.53 ± 0.11

1.56 ± 0.14

0.892

H′max

2.91 ± 0.05

2.95 ± 0.09

0.734

E

0.53 ± 0.04

0.53 ± 0.05

0.977

S

19 ± 1

20 ± 2

0.485

M

0.71 ± 0.09

0.89 ± 0.08

0.153

D

0.65 ± 0.05

0.63 ± 0.05

0.705

Experimental Gill Nets

   

H′

1.46 ± 0.07

1.93 ± 0.06

 < 0.001

H′max

2.05 ± 0.05

2.23 ± 0.07

0.054

E

0.71 ± 0.03

0.86 ± 0.01

0.005

S

8 ± 1

10 ± 1

0.049

M

1.61 ± 0.09

1.77 ± 0.11

0.568

D

0.64 ± 0.03

0.81 ± 0.01

 < 0.001

  1. Bold type signifies difference significant at alpha level of 0.05. Silver carp were not included in these analyses
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