Water quality, habitat, and fish assemblage relationships in middle-order agriculture and forest streams of the Mississippi Alluvial Plain

Ecological Processes

Table 4 Repeated-measures ANOVA of fish assemblage (mean ± SD) variables in agriculture and forest streams of the Mississippi Alluvial Plain

Variable	Agriculture	Forest	Season	Main effect (type)	Interaction (season × type)
Total fish abundance	36 ± 28	62 ± 110	0.014	0.322		0.041
Species richness	7 ± 3	5 ± 4	0.097	0.080		0.115
Species richness index	1.48 ± 0.25	1.19 ± 0.44	0.035	0.083		0.017
					Spring	0.009
					Fall	0.030
Shannon–Wiener diversity	1.44 ± 0.34	0.91 ± 0.50	0.276	< 0.001		0.034
					Spring	< 0.001
Species evenness	0.80 ± 0.13	0.78 ± 0.22	0.445	0.097		0.392
Species dominance	0.68 ± 0.12	0.47 ± 0.24	0.283	< 0.001		0.026
					Spring	< 0.001
Intolerant species relative abundance	0.06 ± 0.12	0.28 ± 0.19	0.020	0.005		0.007
					Spring	< 0.001
					Fall	0.015
Centrarchidae relative abundance	0.41 ± 0.27	0.16 ± 0.21	0.831	0.119		0.125
Cyprinidae relative abundance	0.28 ± 0.23	0.49 ± 0.24	0.495	0.047		0.492
Percidae relative abundance	0.03 ± 0.06	0.14 ± 0.17	0.335	0.032		0.495
Poeciliidae relative abundance	0.11 ± 0.14	0.03 ± 0.10	0.162	0.260		0.316

Data were collected in spring, summer, and fall 2014. Significant effects (P ≤ 0.05) that were interpretable are denoted with bold print