Revue internationale d'écologie méditerranéenne International ...

Table 2 – Variation in the mean concentration ± standard deviation of the different macro- and Micro-nutrients in the living and dead parts of the studied species
in relation to different seasons. *: P < 0.05, **: P < 0.01, ***: P < 0.001, and ns: insignificant different (P > 0.05).
Na K Ca Mg N P Cu Mn Pb
Variable mg g -1 g g-1
Echinochloa stagnina
Winter L 25.2 ± 1.3 23.4 ± 0.7 15.1 ± 0.4 8.7 ± 0.4 10.9 ± 0.2 0.3 ± 0.1 18.6 ± 0.6 153.4 ± 78.0 51.1 ± 26.2
D 16.5 ± 0.7 12.5 ± 0.1 11.4 ± 0.1 8.7 ± 0.1 7.5 ± 0.2 0.2 ± 0.1 21.2 ± 2.3 231.0 ± 11.3 52.6 ± 14.8
Spring L 16.1 ± 0.8 21.7 ± 0.6 12.7 ± 0.4 8.8 ± 0.5 7.0 ± 0.3 0.3 ± 0.1 26.5 ± 0.8 148.0 ± 64.5 51.4 ± 36.8
D 14.0 ± 0.4 11.5 ± 0.2 9.2 ± 0.1 7. 9 ± 0.4 4.2 ± 0.2 0.2 ± 0.1 34.5 ± 6.9 209.6 ± 41.6 64.3 ± 18.6
Summer L 21.7 ± 1.1 24.3 ± 0.9 14.2 ± 0.5 5.4 ± 0.3 8.5 ± 0.3 0.3 ± 0.1 12.9 ± 6.1 102.5 ± 61.8 59.7 ± 40.7
D 20.4 ± 0.8 12.9 ± 0.3 10.6 ± 0.2 7.8 ± 0.2 7.1 ± 0.3 0.1 ± 0.1 44.5 ± 6.1 180.2 ± 44.5 43.3 ± 17.1
ecologia mediterranea – Vol. 36 (1) – 2010
Evaluation of the nutrient status of some hydrophytes in the water courses of Nile Delta, Egypt
Autumn L 26.0 ± 1.0 21.6 ± 0.7 14.0 ± 0.4 8.3 ± 0.4 8.3 ± 0.2 0.3 ± 0.1 16.4 ± 8.8 90.3 ± 12.4 74.6 ± 63.3
D 14.3 ± 0.3 10.0 ± 0.1 8.0 ± 0.1 9.5 ± 0.3 5.6 ± 0.3 0.2 ± 0.1 20.5 ± 9.6 240.1 ± 98.0 72.8 ± 28.2
Annual meal L 22.3 ± 4.5 22.8 ± 1.3 14.0 ± 0.9 7.8 ± 1.6 8.7 ± 1.6 0.3 ± 0.0 18.6 ± 5.8 123.6 ± 31.8 59.2 ± 11.0
D 16.3 ± 2.9 11.7 ± 1.3 9.8 ± 1.5 8.7 ± 0.9 6.1 ± 1.5 0.2 ± 0.1 30.2 ± 11.5 215.2 ± 26.6 58.3 ± 12.9
F-value L 4.35** ns ns 4.50** ns ns 3.69** 7.29*** ns
D ns ns ns 4.48* ns ns ns ns ns
Eichhornia crassipes
Winter L 17.4 ± 0.8 27.4 ± 1.2 26.5 ± 0.7 11.3 ± 0.3 6.7 ± 0.1 0.3 ± 0.1 24.8 ± 9.3 294.8 ± 114.0 57.7 ± 33.9
D 32.8 ± 1.9 14.3 ± 0.5 20.6 ± 0.1 10.1 ± 0.1 1.6 ± 0.1 0.2 ± 0.1 17.8 ± 4.1 201.2 ± 44.0 38.9 ± 16.1
Spring L 21.0 ± 0.6 31.2 ± 1.1 30.0 ± 0.4 16.3 ± 0.2 12.9 ± 0.2 0.5 ± 0.1 46.2 ± 12.6 294.2 ± 156.0 86.3 ± 48.7
D 28.7 ± 1.2 17.4 ± 0.4 21.7 ± 0.1 15.3 ± 0.1 3.0 ± 0.1 0.2 ± 0.1 33.2 ± 8.1 231.5 ± 68.0 59.2 ± 26.1
Summer L 22.5 ± 1.0 30.4 ± 1.3 27.8 ± 0.4 13.3 ± 0.4 19.7 ± 0.3 0.4 ± 0.1 34.5 ± 11.6 331.7 ± 108.0 50.7 ± 31.0
D 36.8 ± 2.9 18.0 ± 1.2 25.8 ± 0.3 14.7 ± 0.2 3.3 ± 0.1 0.2 ± 0.1 13.7 ± 5.9 385.0 ± 296.0 33.0 ± 12.3
Autumn L 21.4 ± 1.0 38.3 ± 1.1 28.7 ± 0.4 18.3 ± 0.6 26.5 ± 0.8 0.7 ± 0.1 31.3 ± 12.5 225.0 ± 84.0 62.2 ± 53.0
D 27.1 ± 1.1 23.6 ± 0.3 19.2 ± 0.3 21.1 ± 1.9 4.0 ± 0.1 0.2 ± 0.1 41.9 ± 18.7 746.5 ± 112.0 55.5 ± 32.7
Annual mean L 20.6 ± 2.2 31.8 ± 4.6 28.3 ± 1.5 14.8 ± 3.1 16.5 ± 8.5 0.5 ± 0.2 34.2 ± 8.9 286.4 ± 44.5 64.2 ± 15.5
D 31.4 ± 4.4 18.3 ± 3.9 21.8 ± 2.8 15.3 ± 4.5 3.0 ± 1.0 0.2 ± 0.0 26.7 ± 13.2 391.1 ± 250.3 46.7 ± 12.7
F-value L 4.39** 3.13* 3.61* 12.82*** 20.39*** 5.50** 6.15** ns ns
D - - - - - - - - -
Ceratophyllum demersum
Winter 28.0 ± 0.5 29.3 ± 0.6 31.5 ± 0.7 14.5 ± 0.5 20.8 ± 0.1 0.7 ± 0.2 33.4 ± 7.5 817.7 ± 375.9 99.2 ± 27.8
Spring 29.6 ± 0.6 31.5 ± 0.6 32.7 ± 0.6 17.5 ± 0.6 20.4 ± 0.2 0.6 ± 0.2 39.5 ± 9.0 1131.2 ± 593.7 103.5 ± 36.2
Summer 29.7 ± 0.8 29.2 ± 0.7 33.0 ± 0.9 24.5 ± 1.1 25.4 ± 0.5 0.6 ± 0.2 54.7 ± 19.9 1283.6 ± 576.7 127.6 ± 34.5
Autumn 37.5 ± 1.1 36.0 ± 0.7 35.8 ± 1.5 25.0 ± 0.9 24.0 ± 0.5 0.8 ± 0.2 44.2 ± 21.5 1467.0 ± 920.0 96.6 ± 39.9
Annual mean 31.2 ± 4.3 31.5 ± 3.2 33.3 ± 1.8 20.4 ± 5.2 22.7 ± 2.4 0.7 ± 0.1 42.0 ± 8.0 1174.9 ± 274.9 106.7 ± 14.2
F-value ns ns ns ns ns 11.43*** 6.19** ns 2.81*
83