The Relationship between Benthic Macroinvertebrate Assemblages and Water Quality Parameters in the Sanyati Basin, Lake Kariba, Zimbabwe

Table 5

Mean (±SE) of macroinvertebrate metrics calculated for six sites in Sanyati basin, Lake Kariba, for the period January-March 2018.

Macroinvertebrate metrics	S1	S2	S3	S4	S5	S6	Kruskal-Wallis
							H
%Ephemeroptera	8.3 ± 1.45^a	11.5 ± 2.88^b	9.3 ± 1.48^a	12.1 ± 2.05^b	14.0 ± 2.30^b	18.7 ± 0.58^c	11.97	0.035
%Trichoptera	2.3 ± 0.93^a	2.5 ± 0.90^a	3.7 ± 1.21^a	4.1 ± 1.50^a	1.4 ± 0.68^a	6.2 ± 0.85^a	9.03	0.108
%Diptera	42.7 ± 2.62^a	26.2 ± 2.42^b	22.2 ± 1.87^b,c	25.1 ± 2.02^b	28.5 ± 1.89^b	18.4 ± 1.24^c	16.06	0.007
%EPT	10.6 ± 1.33^a	14.0 ± 3.59^b	13.1 ± 0.89^b	16.1 ± 3.09^b	15.4 ± 1.87^b	24.9 ± 0.29^c	12.97	0.024
Collector-gatherers	14.1 ± 4.01^a	7.1 ± 2.41^b	4.4 ± 1.28^c	3.8 ± 0.80^c	6.3 ± 1.85^b	6.3 ± 1.71^b	12.02	0.021
Predators	6.6 ± 1.92^a	6.9 ± 1.70^a	6.9 ± 1.20^a	6.5 ± 1.17^a	5.5 ± 0.99^a	10.2 ± 3.45^a	1.58	0.891
Shredders	6.1 ± 0.71^a	3.0 ± 1.01^a	2.5 ± 0.21^a	4.0 ± 0.92^a	5.3 ± 1.23^a	6.0 ± 3.10^a	1.98	0.856
Taxa richness	15.5 ± 1.66^a	15.8 ± 1.70^a	18.3 ± 1.32^a	16.5 ± 1.32^a	17.3 ± 2.2^a	23.3 ± 1.44^b	10.70	0.048
Dominance (D)	0.14 ± 0.02^a	0.09 ± 0.004^a	0.08 ± 0.005^a	0.09 ± 0.009^a	0.09 ± 0.01^a	0.06 ± 0.003^a	10.84	0.052
Shannon-Wiener (H)	2.3 ± 0.12^a	2.5 ± 0.07^a	2.7 ± 0.06^a	2.6 ± 0.09^a	2.6 ± 0.13^a	3.0 ± 0.05^a	5.04	0.232
Pielou evenness (J)	0.66 ± 0.03^a	0.82 ± 0.03^a	0.83 ± 0.02^a	0.83 ± 0.03^a	0.77 ± 0.01^a	0.76 ± 0.02^a	8.96	0.16
Margalef (Dmg)	3.3 ± 0.33^a	3.4 ± 0.39^a	3.8 ± 0.28^a	3.6 ± 0.21^a	3.7 ± 0.45^a	4.7 ± 0.24^a	8.93	0.112