133
the same species the values ranged from 27.77 ± 2.34 ppm dry wt. (at Bagmara)
during premonsoon to 51.12 ± 3.01 ppm dry wt. (at Kakdwip) during monsoon in
root, 23.46 ± 2.47 ppm dry wt. (at Bagmara) during premonsoon to 41.95 ± 2.54 ppm
dry wt. (at Kakdwip) during monsoon in stem and 20.11 ± 1.36 ppm dry wt. (at
Bagmara) during premonsoon to 33.96 ± 2.12 ppm dry wt. (at Kakdwip) in leaf.
During premonsoon in 2013, available Pb values in root, stem and leaf ranged from
from 7.62 ± 0.24 ppm dry wt. (at Bagmara) during premonsoon to 28.04 ± 1.36 ppm
dry wt. (at Kakdwip) during monsoon in root, 5.95 ± 0.34 ppm dry wt. (at Bagmara)
during premonsoon to 25.86 ± 2.40 ppm dry wt. (at Kakdwip) during monsoon in
stem and 4.07  ±  0.22  ppm dry wt. (at Bagmara) during premonsoon to
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
Concentration of Pb (ppm dry wt.)
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
18
20
16
14
12
10
8
6
4
2
0
Fig. 5.29 Spatio-temporal variations of Pb (in ppm dry wt) in the vegetative parts of Avicennia
marina during 2013
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
Concentration of Pb (ppm dry wt.)
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
25
15
5
0
10
20
Fig. 5.30 Spatio-temporal variations of Pb (in ppm dry wt) in the vegetative parts of Avicennia
marina during 2014
5 Mangroves: A Sink of Heavy Metals