Reproductive Ecology and Body Burden of Resident ... - The Love Lab
Reproductive Ecology and Body Burden of Resident ... - The Love Lab
Reproductive Ecology and Body Burden of Resident ... - The Love Lab
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Selenium. Kelp bass did not exhibit a<br />
significant HabType*TL interaction (data not<br />
shown) for selenium. Moreover, selenium concentrations<br />
in kelp bass were not significantly<br />
associated with TL (data not shown). In addition,<br />
selenium concentrations in kelp bass did<br />
not exhibit a significant difference between<br />
HabTypes (Figure 19). On the other h<strong>and</strong>, kelp<br />
rockfish <strong>and</strong> Pacific s<strong>and</strong>dab both exhibited<br />
significant TL*HabType interaction effects<br />
(Figures 20-21), suggesting that relations between<br />
selenium concentration <strong>and</strong> HabType<br />
in these two species differed by TL. In kelp<br />
rockfish, selenium concentrations decreased<br />
by 0.9% (95% confidence interval, -2.2% to<br />
0.3%) for every 1.0-cm increase in TL at oil<br />
platforms but increased by 0.9% (95% confidence<br />
interval, -0.4% to 2.3%) at natural areas.<br />
In Pacific s<strong>and</strong>dab, selenium concentrations<br />
decreased by 0.9% (95% confidence interval,<br />
-2.2% to 0.5%) for every 1.0-cm increase in TL<br />
at oil platforms, <strong>and</strong> decreased by 5.4% (95%<br />
confidence interval, -6.6% to -4.1%) at natural<br />
areas. Nevertheless, in kelp rockfish, selenium<br />
concentrations did not differ between Hab-<br />
Types at least over the TL range <strong>of</strong> sampled<br />
fish (for small rockfish averaging 18.3 cm TL,<br />
F 1,4.5<br />
=1.72, P=0.2522; for large rockfish averaging<br />
34.0 cm TL, F 1,3.8<br />
=0.25, P=0.6444; see Figure<br />
19). In Pacific s<strong>and</strong>dab, small individuals<br />
averaging 13.0 cm TL exhibited significantly<br />
lower concentrations at oil platforms than at<br />
natural areas (F 1,18.6<br />
=13.99, P=0.0014), whereas<br />
large individuals averaging 27.5 cm TL exhibited<br />
significantly higher concentrations at<br />
oil platforms than at natural areas (F 1,22.1<br />
=6.37,<br />
P=0.0193; see Figure 21).<br />
Selenium<br />
F 1,16 =0.45, P=0.5107<br />
F test not shown due<br />
to<br />
significant TL*HabType<br />
interaction<br />
F test not shown due to<br />
significant TL*HabType<br />
interaction<br />
Figure 19. Comparisons <strong>of</strong> selenium concentrations (least-squares<br />
means <strong>and</strong> 95% confidence intervals) in whole-fish samples <strong>of</strong> kelp bass,<br />
kelp rockfish, <strong>and</strong> Pacific s<strong>and</strong>dab from two HabTypes (oil platforms<br />
<strong>and</strong> natural areas). Also shown are F statistics <strong>and</strong> significance levels.<br />
Selenium<br />
Kelp rockfish<br />
TL*HabType Interaction<br />
F 1,28.1 =4.42, P=0.0445<br />
Figure 20. Relation between total length <strong>and</strong> selenium concentration in<br />
whole-body samples <strong>of</strong> kelp rockfish from oil platforms (closed circles<br />
& solid 95% confidence b<strong>and</strong>) <strong>and</strong> natural areas (open circles & dashed<br />
95% confidence b<strong>and</strong>). Also shown are the F statistic <strong>and</strong> significance<br />
level for the TL*HabType interaction.<br />
Pacific s<strong>and</strong>dab<br />
TL*HabType Interaction<br />
F 1,92.5 =23.82, P
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