Z inc and Copper
lOa
100
Mercury
-n
J'\.
W'''' .;H
50
-50
R !p 0
f
r----J
' "
'"
16
' "
E
- 10
0 t:P
10
p'
~
- '"
..,
0
I
10
50
100
Age I months)
lead and Codmium
tOO~amlS 050~
..... 0 ;;'c
5
I
500
' "
'" A
' "
' "
10
50
100
Age I months)
PCB + EOOT
u
0
8 'b
.5 o.l0~~I~EII~ oosE
A~ 10
-
100
'" ~ 50
,~m u~
I
0.01 Ll --6..--1--G¥IllLf.IO;--O-L-LJ.-;:51;;-01-LL-';;10~0;---'
Age (months)
'"
E
c ..
c
o
U
10
5
1 1
5
'tJ
P>
i---1:J
0
a
u
n
o PCB
iJilIOT10
50
100
Ago I months)
Fig. 29. Concentration of trace contaminants in 63 harbor seals (Phoca vitulina) either shot or
found dead in the W. German Wadden-Sea 1974-1976. Data for DDT and PCB are from blubber,
data for trace elements are from liver, concentrations in mg/kg wet weight. Concentrations of
mercury and cadmium increase with age. There is not much difference in lead concentration
between seals and their food, fish. Concentrations of cadmium, zinc, and copper, however, are
significantly higher in seal than in fish, concentrations of DDT, dieldrin and lindan are about
100 times, concentrations of mercury and PCB's are about 1000 times higher in seal blubber or
liver than in fish (Drescher et al. 1977)
46