Fróðskaparrit - 31.12.2000, Page 159

KANNINGAR AV KYKSILVRI OG ORGANOKLORIDUM
IEINSTØKUM HAVSUGDIORUM I FØROYUM
163
grey seals
% 200 - □
» males ■ females
g -n 1sn . o. i nn _ D
£ = =n . □ | ■
0
E 0 - S1 ■
D 10 20 3 age.yrs.
Fig. 7. The concentration ofMirex
in grey seal blubber is plotted as a
function of age. The 22-year-óld
male with the highest Mirex
concentration, 729 pgíkg lipid, is
excluded in thisfigure.
Mynd 7. Innihaldið av Mirex í
láturkópaspiki er víst sum funktión
av aldri á kópi.Tann 22 ára gamli
brimilin, sum hevði hægsta innihald
av Mirex, 729 pg/kg av feitti, er
ikki við á myndini.
Table 18. The precision ofthe toxaphene analyses,
calculated as the sum ofthe sum of the parlars that
were quantifiable (Parlar 26, 50 and 62).
Talva 18. Neyvleikin í toksafenúrslitunum eru víst.
Toksafenúrslitini vórðu roknað út sum samløgan av
teimum einstøku parlarunum, sum kunnu teljast
(parlarar 26, 50 og 62).
Location Sample ID Sum Parlars úg/kg lipid mean std. dev std. dev, %
Sandavágur
26 August 1997 Pilot whale 8 4630 358 8%
Pilot whale 14 13025 837 6%
Pilot whale 21 4989 147 3%
Pilot whale 37 6981 308 4%
Pilot whale 66 5496 293 5%
Tórshavn
24 September Pilot whale 27 2428 92 4%
1997 Pilot whale 49 2222 45 2%
Pilot whale 104 1927 87 5%
Pilot whale 115 1616 40 2%
Pilot whale 126 6435 133 2%
Klaksvík
21 August W.-s. dolphin 56 544 15 3%
1997 W.-s. dolphin 58 9133 361 4%
Faroe Islands
1993 - 1995 Grey seal 14 55 3 5%
Grey seal 53 39 1 3%
Grey seal 68 41 1 3%
All (n = 15) 4%
vealed that seals were more able to
metabolise PCB than toothed whales (Boon
etal., 1992; 1996; 1997). Such differences
were clearly seen in the relative concentra-
tion of CB 118; but also other congeners
like CB 52, 101 and 187 are found in rela-
tively lower concentrations in seals than in
whales. The two whale species have simi-
lar relative concentrations of the higher
chlorinated congeners (those to the right of
CB 138, whereas the lower chlorinated
congeners appear to be more easily degrad-
ed in the smaller dolphins than in the pilot
whales. Especially among the white-sided
dolphin males the relative concentrations of
the CBs 28 and 52 and the pentachlorinated
CBs are markedly lowered. These con-
geners are normally not as prone to bioac-
cumulation (/.<?. the increment in concen-
tration that follows with age) as the heavier
ones like CB 153 and CB 138. In light of
the probable higher mean age of the white-
sided dolphin males in this material, as
mentioned above, increased age could ex-
plain the relatively lower concentrations of
the lower chlorinated congeners in the
males because the ”enrichment” time for
the more persistent congeners is longer.
In Fig. 6, the concentration of PCB is