Absence of PCB Hot Spot Effect in Walleye Sander vitreus from Lower Green Bay of Lake Michigan

Madenjian, Charles P.; Dembkowski, Daniel J.; Isermann, Daniel A.; Batterman, Stuart; Chernyak, Sergei M.; Cogswell, Stewart F.; Holey, Mark E.

doi:10.1007/s00244-018-00591-9

Cited by 1 publication

(5 citation statements)

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“…Lipid concentrations were taken from the earlier study of polychlorinated biphenyl (PCB) accumulation in Fox River walleye. 9 We set α = 0.05 for all statistical testing.…”

Section: ■ Materials and Methodsmentioning

confidence: 69%

“…Apparently, males expend energy at a faster rate than females, because males have a higher resting metabolic rate and greater swimming activity compared with females . Second, PCB determinations of fish have provided important insights into differences in movement patterns between the sexes in certain aquatic ecosystems containing a PCB hot spot in the bottom sediments. ,,− Third, our study has demonstrated the usefulness of Hg isotopes in documenting ontogenetic shifts in habitat use by fish. In certain aquatic ecosystems, stable isotopes of sulfur (S) have also been used to detect differences in habitat use between fish populations residing within the ecosystem .…”

Section: Results and Discussionmentioning

confidence: 81%

“…Field methods used to capture the adult walleye have been previously detailed. 9 Briefly, on April 7, 2014, electrofishing was used to catch 10 female and 10 male adult walleye from the Fox River just below the De Pere Dam, which is situated ∼11 km upriver from the mouth of the Fox River (Figure S1). The total length (TL), weight, and sex of each walleye were recorded.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Specifically, for each of the isotope ratios, the residuals were assigned as the dependent variable, and the TL, weight, age, HgT concentration, or lipid concentration of the walleye was the independent variable in each of the five simple linear regression analyses. Lipid concentrations were taken from the earlier study of polychlorinated biphenyl (PCB) accumulation in Fox River walleye . We set α = 0.05 for all statistical testing.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Results from a mark–recapture study have shown that adult walleye from the Fox River population exhibit a strong site fidelity for returning and spawning in the Fox River . Moreover, mark–recapture data also indicated that nearly all walleye in the Fox River population remain in the Fox River–lower Green Bay system throughout their lives, , potentially exposing them to elevated levels of Hg.…”

Section: Introductionmentioning

confidence: 99%

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Mercury Isotopes Reveal an Ontogenetic Shift in Habitat Use by Walleye in Lower Green Bay of Lake Michigan

Madenjian

Janssen

Lepak

et al. 2018

Environ. Sci. Technol. Lett.

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In general, fish residing in rivers differ from fish residing in lakes in their mercury (Hg) isotope ratios. Specifically, fish residing in lakes typically show enriched values for the isotope ratios of δ202Hg (mass-dependent fractionation of isotope 202Hg) and Δ199Hg (mass-independent fractionation of isotope 199Hg) compared with fish residing in rivers, because photochemical effects acting on Hg isotope ratios are stronger in lakes than in rivers. Whole-fish determinations of Hg isotope ratios in age-0 and adult (ages 4–11) walleye (Sander vitreus) caught in the Fox River, the main tributary to lower Green Bay of Lake Michigan, were dissimilar. Age-0 fish exhibited a river signature for δ202Hg and Δ199Hg, with means equal to 0.00 and 0.26‰, respectively. Significantly elevated levels of δ202Hg and Δ199Hg were observed in adult fish, indicating that adult fish primarily resided in the bay. Our results implied that the Fox River serves as a nursery area for juvenile walleye in the Fox River–lower Green Bay ecosystem. Moreover, corrections for photochemical fractionation of δ202Hg revealed that age-0 and adult walleye shared the same source of Hg in this ecosystem. In addition, Hg isotope ratios did not significantly differ between the sexes of adult walleye, suggesting that these ratios did not fractionate during the Hg elimination process.

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“…Lipid concentrations were taken from the earlier study of polychlorinated biphenyl (PCB) accumulation in Fox River walleye. 9 We set α = 0.05 for all statistical testing.…”

Section: ■ Materials and Methodsmentioning

confidence: 69%