137
However, calcification generates CO 2 during the shell formation process, as
shown by the following chemical equation:
Ca
HCO
CaCO CO H O.
2
3
3
2
2
2
+
-
+
®
+
+
(5.2)
0
5
10
15
20
25
30
Cohort A
Cohort B
Cohort C
Cohort D
Cohort E
Cohort F
Cohort G
Cohort H
Shell length(mm)
6
8 10
2
12
4 6
8 10
2
12
4 6
8 10
2
12
4
2012
2013
2 014
2 015
0
200
400
600
800
1000
1200
1400
Population density (Ind. m
2
)
a
b
Fig. 5.4 (a) Monthly change of population density in Corbicula japonica, and (b) monthly change
of shell length of each cohort in C. japonica (Otani et al. unpublished data)
0
50
100
150
200
250
Organic
Inorganic
Carbon biomass (gC m
-2
)
6 8 10
2
12
4
6 8 10
2
12
4
6 8 10
2
12
4
2012
2013
2014
2015
Fig. 5.5 Monthly change of carbon biomass in Corbicula japonica (Otani et al. unpublished data)
5 Carbon Storage in Tidal Flats