Evaluation of the Nutrient Status of Some Hydrophytes in the Water Courses of Nile Delta, Egypt

Table 3

Variation in the mean concentration ± standard deviation of the different micronutrients in the living (L) and dead (D) parts of the studied species in relation to different seasons.

Variable		Cu 𝜇g g^−1	Mn 𝜇g g^−1	Pb 𝜇g g^−1
	Echinochloa stagnina
Winter	L	18.6±0.6	153.4±78.0	51.1±26.2
	D	21.2±2.3	231.0±11.3	52.6±14.8
Spring	L	26.5±0.8	148.0±64.5	51.4±36.8
	D	34.5±6.9	209.6±41.6	64.3±18.6
Summer	L	12.9±6.1	102.5±61.8	59.7±40.7
	D	44.5±6.1	180.2±44.5	43.3±17.1
Autumn	L	16.4±8.8	90.3±12.4	74.6±63.3
	D	20.5±9.6	240.1±98.0	72.8±28.2
Annual mean	L	18.6±5.8	123.6±31.8	59.2±11.0
	D	30.2±11.5	215.2±26.6	58.3±12.9
F-value	L	3.69^**	7.29^***	ns
	D	ns	ns	ns
	Eichhornea crassipes
Winter	L	24.8±9.3	294.8±114.0	57.7±33.9
	D	17.8±4.1	201.2±44.0	38.9±16.1
Spring	L	46.2±12.6	294.2±156.0	86.3±48.7
	D	33.2±8.1	231.5±68.0	59.2±26.1
Summer	L	34.5±11.6	331.7±108.0	50.7±31.0
	D	13.7±5.9	385.0±296.0	33.0±12.3
Autumn	L	31.3±12.5	225.0±84.0	62.2±53.0
	D	41.9±18.7	746.5±112.0	55.5±32.7
Annual mean	L	34.2±8.9	286.4±44.5	64.2±15.5
	D	26.7±13.2	391.1±250.3	46.7±12.7
F-value	L	6.15^**	ns	ns
	D	—	—	—
	Ceratophyllum demersum
Winter		33.4±7.5	817.7±375.9	99.2±27.8
Spring		39.5±9.0	1131.2±593.7	103.5±36.2
Summer		54.7±19.9	1283.6±576.7	127.6±34.5
Autumn		44.2±21.5	1467.0±920.0	96.6±39.9
Annual mean		42.0±8.0	1174.9±274.9	106.7±14.2
F-value		6.19^**	ns	2.81*

^∗𝑃<.𝟎𝟓, ^∗∗𝑃<.𝟎𝟏, ^∗∗∗𝑃<.𝟎𝟎𝟏, ns: insignificant difference (P > .05).