Effects of aryl hydrocarbon receptor-mediated early life stage toxicity on lake trout populations in Lake Ontario during the 20th century

Philip M. Cook, John A. Robbins, Douglas D. Endicott, Keith B Lodge, Patrick D. Guiney, Mary K. Walker, Erik W. Zabel, Richard E. Peterson

Research output: Contribution to journalArticle

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Abstract

Lake trout embryos and sac fry are very sensitive to toxicity associated with maternal exposures to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and structurally related chemicals that act through a common aryl hydrocarbon receptor (AHR)-mediated mechanism of action. The loading of large amounts of these chemicals into Lake Ontario during the middle of the 20th century coincided with a population decline that culminated in extirpation of this species around 1960. Prediction of past TCDD toxicity equivalence concentrations in lake trout eggs (TECeggs) relative to recent conditions required fine resolution of radionuclide-dated contaminant profiles in two sediment cores; reference core specific biota-sediment accumulation factors (BSAFs) for TCDD-like chemicals in lake trout eggs; adjustment of the BSAFs for the effect of temporal changes in the chemical distributions between water and sediments; and toxicity equivalence factors based on trout early life stage mortality. When compared to the dose - response relationship for overt early life stage toxicity of TCDD to lake trout, the resulting TEC eggs predict an extended period during which lake trout sac fry survival was negligible. By 1940, following more than a decade of population decline attributable to reduced fry stocking and loss of adult lake trout to commercial fishing, the predicted sac fry mortality due to AHR-mediated toxicity alone explains the subsequent loss of the species. Reduced fry survival, associated with lethal and sublethal adverse effects and possibly complicated by other environmental factors, occurred after 1980 and contributed to a lack of reproductive success of stocked trout despite gradually declining TECeggs. Present exposures are close to the most probable no observable adverse effect level (NOAEL TECegg=5 pg TCDD toxicity equivalence/g egg). The toxicity predictions are very consistent with the available historical data for lake trout population levels in Lake Ontario, stocking programs, and evidence for recent improvement in natural reproduction concomitant with declining levels of persistent bioaccumulative chemicals in sediments and biota.

Original languageEnglish (US)
Pages (from-to)3864-3877
Number of pages14
JournalEnvironmental Science and Technology
Volume37
Issue number17
DOIs
StatePublished - Sep 1 2003

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Aryl Hydrocarbon Receptors
Toxicity
Lakes
hydrocarbon
toxicity
lake
dioxin
Sediments
egg
biota
population decline
sediment
effect
mortality
sublethal effect
dose-response relationship
prediction
Radioisotopes
reproductive success
sediment core

Cite this

Cook, P. M., Robbins, J. A., Endicott, D. D., Lodge, K. B., Guiney, P. D., Walker, M. K., ... Peterson, R. E. (2003). Effects of aryl hydrocarbon receptor-mediated early life stage toxicity on lake trout populations in Lake Ontario during the 20th century. Environmental Science and Technology, 37(17), 3864-3877. https://doi.org/10.1021/es034045m

Effects of aryl hydrocarbon receptor-mediated early life stage toxicity on lake trout populations in Lake Ontario during the 20th century. / Cook, Philip M.; Robbins, John A.; Endicott, Douglas D.; Lodge, Keith B; Guiney, Patrick D.; Walker, Mary K.; Zabel, Erik W.; Peterson, Richard E.

In: Environmental Science and Technology, Vol. 37, No. 17, 01.09.2003, p. 3864-3877.

Research output: Contribution to journalArticle

Cook, PM, Robbins, JA, Endicott, DD, Lodge, KB, Guiney, PD, Walker, MK, Zabel, EW & Peterson, RE 2003, 'Effects of aryl hydrocarbon receptor-mediated early life stage toxicity on lake trout populations in Lake Ontario during the 20th century' Environmental Science and Technology, vol. 37, no. 17, pp. 3864-3877. https://doi.org/10.1021/es034045m
Cook, Philip M. ; Robbins, John A. ; Endicott, Douglas D. ; Lodge, Keith B ; Guiney, Patrick D. ; Walker, Mary K. ; Zabel, Erik W. ; Peterson, Richard E. / Effects of aryl hydrocarbon receptor-mediated early life stage toxicity on lake trout populations in Lake Ontario during the 20th century. In: Environmental Science and Technology. 2003 ; Vol. 37, No. 17. pp. 3864-3877.
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