Fig. la,b. MT concentrations in M.
galloprovincialis, T. philippinarurn
and S. inequivalvis collected from two
sites (n = 7 specimens per site).
a Digestive glands: significant differences: Chioggia: Mytilus versus Tapes,
Mytilus versus Scapharca, Tapes versus
Scapharca; Marghera: Mytilus versus
Tapes. Mytilus versus Scapharca, Tapes
versus Scapha rca. b Gills; no significant differences
"5
a
0>
E
S
0>
=
4
3 .5
3
0 .5
o -!-_-J-_ _
4
35
3
25
2
1 5
05
0
Metallothionein and Glutathione as Stress Indicators
87
digestive gland
gill s
Chi oggi a
D Tapes
~Scapharca
£;lI Myfllus
Margher
DTapes
~ Scapflarca
I§lIMytllus
Marghere
a
b
Table. Tissue metal concentrations (fig of metallg of dry weight) detennined in organisms sampled in two areas of Lagoon of
Venice
Marghera
Cr
Mn
Fe
Co
Ni
Cu
Zn
Cd
Tapes
Digestive gland
21.2±B.l
9.B±1.7
268.2±36.9
19.3±4.3
15.B±5.2
41.6±3.7
116.5±16.3
O.7±O.2
Gills
8.2±3.0
1 l.O± 1.3
292.9±49.3
16.8±3.3
6.3±1.6
lO.9±O.7
lO1.2±12.3
1.4±O.3
Scapharca
Digestive gland
20.4±12.4
2.4±O.5
178.1±17.8
2.6±1.0
14.0±9.0
19.B±1.1
61.5±2.7
O. B±O.l
Gills
46.5±12.4 29.0±5.2
· 514.0±32.6
50.7±23.9
40.4±1O.4
8.9±2.9
208.4±48.1
B.9±2.5
Mytilus
Digestive gland
5.1±1.7
4.2±1.3
101.7±15.4
6.2±1.5
6.8±1.3
19.2±1.2
115.2±13A
1.6±O.1
Gills
4.6±2.0
1.7±O.3
26.B±5.6
14.9±3.B
9.8±1.1
19.4±3.1
115.5±12.7
O.6±O.2
Chioggia
Cr
Mn
Fe
Co
Ni
Cu
Zn
Cd
Tapes
Digestive gland
8.9±3.5
12.0±2.3
276.1±56.4
54.0±15.1
8.5±2.6
25.2±2.7
83.7±12.3
O.3±O.O
Gills
IB.B±6.3
37.2±12.0
425.4±70A
55.1±13.2
15.0±4.2
12.5±2.0
lOB.6±15.7
O.6±O.1
Mytilus
Digestive gland
6.5±1.2
19.6±1.l
347.7±63.6
22.5±7.9
6.B±O.B
16.2±O.9
n . l±12.4
O.9±O.1
Gills
4.4±2.0
6.7±O.5
13B.5±17,4
4.3±1.1
7.5±O.B
15.7±6.0
71.4±11.2
O.5±O.l