Fróðskaparrit - 31.12.2000, Síða 160

164
INDIVIDUAL ANALYSES OF MERCURY AND ORGANOCHLORINES
IN MARINE MAMMALS FORM THE FAROE ISLANDS
w-s đolphíns P fion
N O) n o □ □ D
o males ■ females
E 2 — ^nn - 3 □ □ □ □ □
Bl L. ■ * -1°. a ■ ■« 50
E u H 1 )0 150 200 250 3( body length, cm
Fig. 8. Mirex in white-sided
dolphin blubber is shown in
pg/kg lipid.
Mynd 8. Mirex í hvítskjór-
utum springaraspiki er vfst í
eindini pg/kg av feitti.
shown as a function of individual body
lengths for the three species analysed. The
PCB in Fig. 6 is given as PCB 7, which is
the sum of the concentrations of the indi-
vidual CBs numbered 28, 52, 101, 118,
138,153 and 180. Because the scale of Fig.
6 is dictated by the larger body size of the
pilot whales, this figure may reasonably be
described as “the pilot whale perspective”.
The overall different tracks of the PCB vs.
body lengths curves for the females (Fig.
6A) as compared to that of the males (Fig.
6B) are, however, clear even in the distort-
ed perspective. A review of the plotted data
in Fig. 6A reveals that a peak in PCB con-
centration in the females occurs at an inter-
mediate body length, whereas for the grey
seal and white-sided dolphin males there
Table 19. The highest and lowest concentrations encountered in the present study, comprising in all 261
marine mammals ofwhich 200 are pilot whales from four separate pods.
Talva 19. Hægsta og lægsta innihald, sum varð ávíst í hesi kanning, sum fevnir um til samans 261 havsúgdjór,
teirra millum eru 200 grindahvalir úr fýra ymiskum grindum.
Parameter max- min pg/kg lipid* Highest concentrations individual Lowest concentration individual
Mercury 5,940-70 Pilot whale, Tórshavn, 13-11-97, male (560 cm) W-s dolphin, Klaksvík, 21-08-97, female 37F, (smallest one)
PCB 7 24,518-436 Grey seal, 08-08-94, male H38M W-s dolphin, Klaksvík, 21-08-97, female 41F
Sum DDT (incl. ø,/?’-isomers) 47,909-220 Pilot whale, Sandavágur 26-08-97, male S37M Grey seal, 18-08-95, female H64F
Toxaphene (Sum Parlars) 14,234-15 W-s dolphin, Klaksvík, 21-08-97, male 14M Grey seal, 18-08-95, female H65F
Sum Chlordanes 12,020-160 W-s dolphin, Klaksvík, 21-08-97, male 38M Grey seal, 18-08-95, female H64F
Mirex 729-8.4 Grey seal, 08-08-94, male H38M Grey seal, 18-07-95, female H51F
* Mercury is given as |ig/kg muscle.