135
stem and 0.02 ± 0.001 ppm dry wt. (at Bagmara) during premonsoon to
0.07 ± 0.006 ppm dry wt. (at Kakdwip) in leaf of A. officinalis. In 2014, for the same
species the values ranged from 0.04 ± 0.007 ppm dry wt. (at Bagmara) during premonsoon to 0.10 ± 0.007 ppm dry wt. (at Kakdwip) during monsoon in root,
0.03 ± 0.001 ppm dry wt. (at Bagmara) during premonsoon to 0.09 ± 0.002 ppm dry
wt. (at Kakdwip) during monsoon in stem and 0.03 ± 0.007 ppm dry wt. (at Bagmara)
during premonsoon to 0.08 ± 0.001 ppm dry wt. (at Kakdwip) in leaf respectively
(Figs. 5.33, 5.34, 5.35, 5.36, 5.37, 5.38, 5.39, and 5.40).
In case of E. agallocha, during 2013, concentration of Zn values ranged from
11.72 ± 0.87 ppm dry wt. (at Bagmara) during premonsoon to 61.44 ± 3.94 ppm dry
wt. (at Kakdwip) during monsoon in root, 5.75 ± 0.16 ppm dry wt. (at Bagmara)
during premonsoon to 47.1 ± 2.81 ppm dry wt. (at Kakdwip) during monsoon in
stem and 2.05 ± 0.13 ppm dry wt. (at Bagmara) during premonsoon to
27.57 ± 1.65 ppm dry wt. (at Kakdwip) in leaf of E. agallocha. In 2014, for the same
species the values ranged from 24.34 ± 1.40 ppm dry wt. (at Bagmara) during premonsoon to 93.32 ± 4.29 ppm dry wt. (at Kakdwip) during monsoon in root,
22.93 ± 1.21 ppm dry wt. (at Bagmara) during premonsoon to 91.87 ± 5.61 ppm dry
wt. (at Kakdwip) during monsoon in stem and 16.03 ± 1.33 ppm dry wt. (at Bagmara)
during premonsoon to 48.83 ± 3.48 ppm dry wt. (at Chemaguri) in leaf. For Cu, the
values in root, stem and leaf ranged from 5.25 ± 0.14 ppm dry wt. (at Bagmara)
during premonsoon to 29.78 ± 2.48 ppm dry wt. (at Sagar South) during monsoon
in root, 3.23 ± 0.06 ppm dry wt. (at Bagmara) during premonsoon to 22.54 ± 2.14 ppm
dry wt. (at Kakdwip) during monsoon in stem and 1.85 ± 0.03 ppm dry wt. (at
Bagmara) during premonsoon to 20.06 ± 1.44 ppm dry wt. (at Kakdwip) in leaf of
E. agallocha. In 2014, for the same species the values ranged from 15.24 ± 1.22 ppm
dry wt. (at Bagmara) during premonsoon to 39.04 ± 2.16 ppm dry wt. (at Kakdwip)
during monsoon in root, 11.66 ± 1.02 ppm dry wt. (at Bagmara) during premonsoon
to 32.15 ± 2.17 ppm dry wt. (at Kakdwip) during postmonsoon in stem and
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
Concentration of Zn (ppm dry wt.)
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
140
120
100
80
60
40
20
0
Fig. 5.33 Spatio-temporal variations of Zn (in ppm dry wt) in the vegetative parts of Avicennia
officinalis during 2013
5 Mangroves: A Sink of Heavy Metals
stem and 0.02 ± 0.001 ppm dry wt. (at Bagmara) during premonsoon to
0.07 ± 0.006 ppm dry wt. (at Kakdwip) in leaf of A. officinalis. In 2014, for the same
species the values ranged from 0.04 ± 0.007 ppm dry wt. (at Bagmara) during premonsoon to 0.10 ± 0.007 ppm dry wt. (at Kakdwip) during monsoon in root,
0.03 ± 0.001 ppm dry wt. (at Bagmara) during premonsoon to 0.09 ± 0.002 ppm dry
wt. (at Kakdwip) during monsoon in stem and 0.03 ± 0.007 ppm dry wt. (at Bagmara)
during premonsoon to 0.08 ± 0.001 ppm dry wt. (at Kakdwip) in leaf respectively
(Figs. 5.33, 5.34, 5.35, 5.36, 5.37, 5.38, 5.39, and 5.40).
In case of E. agallocha, during 2013, concentration of Zn values ranged from
11.72 ± 0.87 ppm dry wt. (at Bagmara) during premonsoon to 61.44 ± 3.94 ppm dry
wt. (at Kakdwip) during monsoon in root, 5.75 ± 0.16 ppm dry wt. (at Bagmara)
during premonsoon to 47.1 ± 2.81 ppm dry wt. (at Kakdwip) during monsoon in
stem and 2.05 ± 0.13 ppm dry wt. (at Bagmara) during premonsoon to
27.57 ± 1.65 ppm dry wt. (at Kakdwip) in leaf of E. agallocha. In 2014, for the same
species the values ranged from 24.34 ± 1.40 ppm dry wt. (at Bagmara) during premonsoon to 93.32 ± 4.29 ppm dry wt. (at Kakdwip) during monsoon in root,
22.93 ± 1.21 ppm dry wt. (at Bagmara) during premonsoon to 91.87 ± 5.61 ppm dry
wt. (at Kakdwip) during monsoon in stem and 16.03 ± 1.33 ppm dry wt. (at Bagmara)
during premonsoon to 48.83 ± 3.48 ppm dry wt. (at Chemaguri) in leaf. For Cu, the
values in root, stem and leaf ranged from 5.25 ± 0.14 ppm dry wt. (at Bagmara)
during premonsoon to 29.78 ± 2.48 ppm dry wt. (at Sagar South) during monsoon
in root, 3.23 ± 0.06 ppm dry wt. (at Bagmara) during premonsoon to 22.54 ± 2.14 ppm
dry wt. (at Kakdwip) during monsoon in stem and 1.85 ± 0.03 ppm dry wt. (at
Bagmara) during premonsoon to 20.06 ± 1.44 ppm dry wt. (at Kakdwip) in leaf of
E. agallocha. In 2014, for the same species the values ranged from 15.24 ± 1.22 ppm
dry wt. (at Bagmara) during premonsoon to 39.04 ± 2.16 ppm dry wt. (at Kakdwip)
during monsoon in root, 11.66 ± 1.02 ppm dry wt. (at Bagmara) during premonsoon
to 32.15 ± 2.17 ppm dry wt. (at Kakdwip) during postmonsoon in stem and
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
Concentration of Zn (ppm dry wt.)
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
140
120
100
80
60
40
20
0
Fig. 5.33 Spatio-temporal variations of Zn (in ppm dry wt) in the vegetative parts of Avicennia
officinalis during 2013
5 Mangroves: A Sink of Heavy Metals