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Modeling effects of toxin exposure in fish on long-term population size, with an application to selenium toxicity in bluegill (Lepomis macrochirus)

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  • Gledhill, Michelle
  • Van Kirk, Robert W.

Abstract

A primary goal in ecotoxicology is the prediction of population-level effects of contaminant exposure based on individual-level response. Assessment of toxicity at the population level has predominately focused on the population growth rate (PGR), but the PGR may not be a relevant toxicological endpoint for populations at equilibrium. Equilibrium population size may be a more meaningful endpoint than the PGR because a population with smaller equilibrium size is more susceptible to the negative effects of environmental variability. We address the individual-to-population extrapolation problem with modeling utilizing classical mathematical theory. We developed and analyzed a general model applicable to many freshwater fish species, that includes density-dependent juvenile survival and additional juvenile mortality due to toxicity exposure, and we quantified effect on equilibrium population size as a means of assessing toxicity. Individual-level effects are typically greater than population-level effects until the individual effect is large, due to compensatory density-dependent relationships. These effects are sensitive to the recruitment potential of a population, in particular the low-density first-year survival rate Sb. Assuming high Sb could result in underestimating effects of population-level toxicity. The equilibrium size depends directly on Sb, the reproductive potential, the toxin concentration at which mean mortality is 50% (LC50), and the rate at which individual mortality increases with increasing toxin concentration. More experimental data are needed to decrease the uncertainty in estimating these parameters. We then used existing data for selenium toxicity in bluegill sunfish to parameterize a simulation version of the model as an example to assess the effects of environmental stochasticity on toxicity response. Effects of environmental variability resulted in simulated extinctions at much lower toxin concentrations than predicted deterministically.

Suggested Citation

  • Gledhill, Michelle & Van Kirk, Robert W., 2011. "Modeling effects of toxin exposure in fish on long-term population size, with an application to selenium toxicity in bluegill (Lepomis macrochirus)," Ecological Modelling, Elsevier, vol. 222(19), pages 3587-3597.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:19:p:3587-3597
    DOI: 10.1016/j.ecolmodel.2011.08.023
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    References listed on IDEAS

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    1. Van Kirk, Robert W. & Hill, Sheryl L., 2007. "Demographic model predicts trout population response to selenium based on individual-level toxicity," Ecological Modelling, Elsevier, vol. 206(3), pages 407-420.
    2. Brett A. Melbourne & Alan Hastings, 2008. "Extinction risk depends strongly on factors contributing to stochasticity," Nature, Nature, vol. 454(7200), pages 100-103, July.
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    1. Brito, Izabella de Andrade & López-Barrera, Ellie Anne & Araújo, Sabrina Borges Lino & Ribeiro, Ciro Alberto de Oliveira, 2017. "Modeling the exposure risk of the silver catfish Rhamdia quelen (Teleostei, Heptapteridae) to wastewater," Ecological Modelling, Elsevier, vol. 347(C), pages 40-49.

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