Reproductive Ecology and Body Burden of Resident ... - The Love Lab

Cadmium. Cadmium concentrations
in the three fish species did not exhibit significant
HabType*TL interactions (data
not shown). However, cadmium concentrations
were significantly associated with TL in
kelp bass (F 1,15
=11.74, P=0.004) and Pacific
sanddab (F 1,95.0
=6.71, P=0.011), but not in
kelp rockfish (data not shown). In kelp bass,
cadmium concentrations increased by 9.4%
(95% confidence interval, 3.5% to 15.7%) per
1.0-cm increase in TL. In Pacific sanddab, cadmium
concentrations increased by 4.1% (95%
confidence interval, 0.9% to 7.3%) per 1.0-cm
increase in TL. Nevertheless, after controlling
for TL, cadmium concentrations did not differ
significantly between HabTypes in these two
species (Figure 5). Cadmium concentrations
in kelp rockfish also did not differ between
HabTypes (Figure 5).
Chromium. Among the three fish species,
chromium concentrations did not exhibit significant
HabType*TL interactions nor significant
associations with TL (data not shown).
However, chromium concentrations differed
significantly between HabTypes for kelp bass
and Pacific sanddab, but not for kelp rockfish
(Figure 6). In both kelp bass and Pacific
sanddab, chromium concentrations were lower
at oil platforms than at natural areas. Kelp
bass averaged 0.47 µg Cr/g (95% confidence
interval, 0.40-0.56 µg/g) at oil platforms, and
0.62 µg Cr/g (95% confidence interval, 0.54-
0.72 µg/g) at natural areas, whereas Pacific
sanddabs averaged 0.71 µg Cr/g (95% confidence
interval, 0.36-1.4 µg/g) at oil platforms,
and 2.1 µg Cr/g (95% confidence interval, 1.1-
4.3 µg/g) at natural areas.
Cobalt. Cobalt concentrations in the
three fish species did not exhibit significant
HabType*TL interactions (data not shown),
nor significant associations with TL (data not
shown). Moreover, cobalt concentrations in
the three species did not differ significantly
between HabTypes (Figure 7).
Cadmium
Figure 5. Comparisons of cadmium concentrations (least-squares means
and 95% confidence intervals) in whole-fish samples of kelp bass, kelp
rockfish, and Pacific sanddab from two HabTypes (oil platforms and natural
areas). Also shown are F statistics and significance levels. Total length
is reported if the F statistic was computed from analysis of covariance.
Chromium
For TL=34.4 cm
F 1,15 =3.88, P=0.0676
F 1,8.2 =1.94, P=0.2001
For TL=19.8 cm
F 1,7.9 =7.90, P=0.5310
Figure 6. Comparisons of chromium concentrations (least-squares
means and 95% confidence intervals) in whole-fish samples of kelp bass,
kelp rockfish, and Pacific sanddab from two HabTypes (oil platforms
and natural areas). Also shown are F statistics and significance levels.
Cobalt
F 1,16 =7.08, P=0.0171
F 1,16 =1.27, P=0.2764
F 1,6.0 =0.98, P=0.3611
F 1,6.0 =0.81, P=0.4023
F 1,8.0 =6.80, P=0.0312
F 1,8.0 =0.0207, P=0.8891
Figure 7. Comparisons of cobalt concentrations (least-squares means
and 95% confidence intervals) in whole-fish samples of kelp bass, kelp
rockfish, and Pacific sanddab from two HabTypes (oil platforms and
natural areas). Also shown are F statistics and significance levels.
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