Water quality impacts of small-scale hydromodification in an urban stream in Connecticut, USA

Ecological Processes

Table 1 Results of one-way ANOVA

Water quality indicator		ANOVA between sampling sites			ANOVA between periods
Water quality indicator		Before construction	During construction	After construction	Site A	Site B	Site C	Site D
Turbidity	F	0.127	4.051	1.445	0.623	6.346	46.927	12.429
Turbidity	p value	0.944	0.010	0.238	0.542	0.004	< 0.001	< 0.001
DO	F	0.105	0.149	0.118	2.881	1.588	5.552	2.896
DO	p value	0.956	0.929	0.948	0.090	0.239	0.017	0.091
Nitrate	F	1.138	0.479	0.044	47.000	59.305	48.666	44.006
Nitrate	p value	0.340	0.698	0.988	< 0.001	< 0.001	< 0.001	< 0.001
TP	F	0.067	0.410	0.502	14.038	142.671	26.721	61.170
TP	p value	0.977	0.746	0.682	< 0.001	< 0.001	< 0.001	< 0.001
Macroinvertebrate taxon richness	F	17.459	5.687	1.113	2.442	5.000	46.731	2.016
Macroinvertebrate taxon richness	p value	< 0.001	0.006	0.370	0.121	0.022	<0.001	0.173
Shannon-Weaver macroinvertebrate species diversity	F	5.705	1.711	2.189	3.782	3.029	5.239	0.500
Shannon-Weaver macroinvertebrate species diversity	p value	0.005	0.197	0.125	0.049	0.081	0.020	0.618

Left: Comparison of sampling site means of turbidity, DO, nitrate, TP, macroinvertebrate taxon richness, and Shannon-Weaver macroinvertebrate species diversity, evaluated for the periods before (BE), during (DU), and after construction (AF). Right: Comparison of periodic means (BE, DU, AF) of the same variables per sampling site