Bacterial Diversity and Bioremediation Potential of the Highly Contaminated Marine Sediments at El-Max District (Egypt, Mediterranean Sea)

Table 4

(a) Sequential test (DistLM) explaining the total variation with the contribution of all the predictor variables accounted separately according to their division in (a) physical data, (b) metal/metalloid concentration, and (c) nutrients/pollutants concentration. = statistic; = probability; Prop. = proportion of total variation explained; Cumul. = cumulative explained by the listed variables; Res.df = residual degrees of freedom. Statistically significant variables are written in bold type.

(a)

Sequential tests
Variable	AIC			Prop.	Cumul.	Res.df
+% sand	35,267	16,445	0,0036	0,62186	0,62186	10
+% silt	34,458	2,3747	0,0738	0,078943	0,70081	9
+% clay	28,526	7,493	0,0008	0,1447	0,84551	8
Mean size	28,526	No test		−1,60 − 14	0,84551	8
Water content	28,526	No test		−1,59 − 16	0,84551	8
Porosity	28,526	No test		1,14 − 15	0,84551	8

(b)

Sequential tests
Variable	AIC			Prop.	Cumul.	Res.df
Cu	40,706	6,8084	0,0092	0,40506	0,40506	10
Fe	30	16,947	0,0009	0,38858	0,79364	9
Zn	28,526	2,686	0,055	0,051871	0,84551	8
Cr	28,526	No test		−4,67 − 16	0,84551	8
Ni	28,526	No test		−6,42 − 16	0,84551	8
Cd	28,526	No test		7,80 − 16	0,84551	8
Co	28,526	No test		−2,21 − 16	0,84551	8
Pb	28,526	No test		5,79 − 16	0,84551	8
As	28,526	No test		7,27 − 16	0,84551	8

(c)

Sequential tests
Variable	AIC			Prop.	Cumul.	Res.df
TAH	46,138	0,68916	0,506	6,45	6,45 − 02	10
TOC	31,775	26,19	0,0006	0,69626	0,76073	9
PCHs	28,526	4,3898	0,0099	8,48	0,84551	8
Tpest	28,526	No test		3,40	0,84551	8
TN	28,526	No test		−9,57	0,84551	8
TP	28,526	No test		8,47	0,84551	8