Fróðskaparrit - 31.12.2000, Side 158

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INDIVIDUAL ANALYSES OF MERCURY AND ORGANOCHLORINES
IN MARINE MAMMALS FORM THE FAROEISLANDS
Fig. 6. The concentrations ofPCB 7
in grey seals, white-sided dolphins
and pilot whales are plotted as a
function ofwhole body length. Note
that the scalefor PCB for females (A)
is different than thatfor males (B).
Mynd 6. Innihaldið av PCB 7 í
láturkópum, hvítskjórutum springarum
og grindahvølum eru víst sum
funktión av kropslongd. Gevið gætur
eftir, at stigini eru ikki eins á mynd A
ogB.
Table 17. Precision ofSum DDT results, which
were calculated as the sum ofthe individually
quantified p,p ’-DDT, p,p ’-DDE, p,p ’-DDD, and the
o, p ’-substituted isomers.
Talva 17. Neyvleikin í sum-DDT-úrslitunum eru
víst. Sum-DDT varð roknað út sum samløgan av
p. p’-DDT, p,p’-DDE, p,p’-DDD og teimum o,p’-
substitueraðu isomerunum.
# Ref. Sum DDT std. dev std. dev%
pg/kg lipid.
mean
56F 1288 21 2%
58M 22501 738 3%
S8M 8254 161 2%
SI4F 25217 1187 5%
S21M 13153 325 2%
S37M 45687 3143 7%
S66F 22689 494 2%
T27F 6488 245 4%
T49F 6146 42 1%
T104F 4655 88 2%
T115F 3576 47 1%
T126F 13389 184 1%
H14F 766 16 2%
H53F 1328 76 6%
H68F 995 47 5%
All (n= 15) 3%
tors. Such species-specific differences
could stem from differences in the duration
of the nursing period. Grey seals, for ex-
ample, nurse their offspring for a few
weeks whereas the toothed whale species
nurse their young for a year or more (Bloch
and Fuglø, 1999).
The two pods of pilot whale that were
analysed are similar with respect to the
concentration Of PCB. Also the relative
contribution of the various congeners, often
termed the congener profile (Fig. 4), are
similar in these two pods. Therefore, to
simplify the comparison of the congener
profile between the species, only one of the
pilot whale pods was included (Fig. 5). The
absolute concentrations are not suitable in-
dicators of species-specific differences be-
cause the absolute concentrations are high-
ly influenced by dietary intake of the com-
pounds, which, of course, varies for the var-
ious food groups and from area to area.
Earlier studies of species-specific differ-
ences in other marine mammal species re-