Fróðskaparrit - 31.12.2000, Blaðsíða 153

KANNINGAR AV KYKSILVRI OG ORGANOKLORIDUM
IEINSTØKUM HAVSUGDJORUM I FØROYUM
157
ff-sdolphins
** 1,6 1,4 1,2
O 1
O) £ o co
E E 0,6
U) 0,4
X 0,2 0
X ■■
■ X . *
"s X X ■ *x *
B X
B X*
■ X

B ■
■ female
* male
100
200
3 00
Fig. 2. The concentrations of
mercury in white-sided dolphin
females and males are shown as
afunction ofbody length.
Mynd 2. Innihaldið av kyksilvri
í vøddum í hvítskjórutum
springarum er víst sum funktión
av longd á bæði hann- og
honhvølum.
Body length, oi
Results
Mercurv
The individual mercury concentrations in
the grey seals are shown in Fig. 1. It is
noteworthy that all seals, except a 21-year-
old male, had mercury concentrations low-
er than 2 mg/kg. The old male had an en-
tirely different level at almost 5 mg mer-
cury per kg of muscle.
Table 12. The ratio of p,p'-DDT to p.p -DDE are
shownfor thefour age-sex groups ofthe species
analysed.
Talva 12. Lutfallið millum p,p'-DDT og p.p'-DDE
er víst fyri teir fýra undirbólkarnar av honum,
hannum, ungum og vaksnum í teimum trimum
sløgunum, sum vórðu kannað.
DDT/DDE grey seal w.-sided dolphin pilot whale Sanda- vágur pilot whale Tórshavn 24-09-97
juv. females 0.2 0.3 0.3 0.3
ad. females 0.3 0.4 0.4 0.4
juv. males 0.2 0.2 0.3 0.3
ad. males 0.3 0.1 0.2 0.2
The average mercury concentrations in
the pilot whales taken in Tórshavn on 13
November 1997 and in the Leynar pod
were 2.82 and 1.43 mg/kg, respectively
(Table 3). When comparing overall con-
centrations of mercury among the groups of
young and adults of both sexes, it is appar-
ent that the overall highest concentration is
found in the adult males, but is almost as
high in adult females. The concentration in
juveniles is lower than in the adults. When
plotting the mercury concentrations vs. pi-
lot whale body length, a tendency towards
increasing concentrations with body length
emerges (Fig. 3). This tendency is apparent
as well for young females and males and
also for adult males. For the group of adult
female pilot whales (Fig. 3B) in the Tór-
shavn pod, there are large variations in mer-
cury concentration, but there still appears
to be an increase as body length increases.
In the Leynar pod, on the other hand, the in-
crease with body length in adult females is
much less pronounced and the actual high-