De Schamphelaere, Karel

Janssen, Sharon

Viaene, Karel

English

Ghent University Academic Bibliography

POPULATION LEVEL RISK ASSESSMENT OF COPPER TOXICITY TO RAINBOW TROUT (ONCORHYNCHUS MYKISS)1 Laboratory of Environmental Toxicology and Aquatic Ecology, Environmental Toxicology Unit (GhEnToxLab), Ghent University, Ghent, Belgium2 Arche Consulting, Liefkensstraat 35D, 9032 Wondelgem, Ghent, BelgiumSharon D. Janssen1, Karel P.J. Viaene2, Karel Vlaeminck1,2, Patrick A. Van Sprang2 and Karel A.C. De Schamphelaere1Contactsharon.janssen@ugent.bewww.ecotox.ugent.be @GhEnToxLab @ugentGhent University• A decrease in survival rates due to an increase in total copper, led to a decrease in population size over time• Mean of 10 simulations• A log-logistic concentration-response modelwas fitted for the relative population size in each year• Individual level LC10 (78-day survival): 52 μg/L• Population level EC10 (modelled), average over 10 years: 60 μg/L inSTREAM-Gen• For extrapolation to population level, the individual based model inSTREAM-Gen was used (Ayllón et al., 2016)• Several parameters were adjusted to O. mykiss specific parameters• Effects on survival were incorporated in the yolk-sac phase in the redd survival function and in the swim-up fry phase of the 0-year old survival functionConclusion & future development- The EC10 value on population level was about 15% higher compared to the standard approach- Incorporating effects of copper toxicity on other vital rates- Correct for copper bioavailabilityAcknowledgements: This research is supported by the European Copper Institute (ECI) and the International Zinc Association (IZA)References: Ayllón et al. 2016, Ecological Modelling 326: 36-53. Jager and Ashauer 2018, version 1.0 leanpub: https://leanpub.com/ guts_book.%0A. Seim et al. 1984, Canadian Journal of Fisheries and Aquatic Sciences 41 (3): 433–438.Original figure from Ayllón et al., 2016Modified, original figure of Jager and Ashauer, 2018• Currently, risk assessment of metals is based on species sensitivity distributions (SSD)compiled with laboratory toxicity data on individual-level endpoints• However, individual-level endpoints do not necessarily translate directly to a similar effect at population level• Therefore, there is a need for a population level approach which can integrate effects on various vital ratesINDIVIDUAL METAL METALPOPULATIONREPRODUCTION[ METAL ]POP. DENSITY[ METAL ]19943Toxicokinetic-Toxicodynamic modellingPopulation level response• Data of early life stages (Seim et al., 1978) showed two phases of mortality, before and after day 40 (corresponding with 46 dph)• This corresponds with the switch from the yolk sac stage to swim-up fry stage• Two GUTS models were fitted to the data:• Yolk sac: GUTS-reduced-SD• Swim-up fry: GUTS-reducedGoal of the study:• Derive population level EC10 values for the effect of copper toxicity on rainbow trout (Oncorhynchus mykiss) and compare those with individual level EC10 valuesDamage level (D)• Toxicity experiment: early life stages of O. mykiss are most sensitive for copper toxicity• Effect of copper on survival rates of early life stages was modelled using the General Unified Threshold Model (GUTS) (Jager and Ashauer, 2018)210.2

Population level risk assessment of copper toxicity to rainbow trout (Oncorhynchus mykiss)

https://biblio.ugent.be/publication/8621235/file/8621238.pdf

Population level risk assessment of copper toxicity to rainbow trout (Oncorhynchus mykiss)

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Ghent University Academic Bibliography