Abstract
Although the responses of people to environmental accidents are often subjective and emotional, scientific evaluation of environmental impacts must be founded on careful study and rigorous analysis. Assessments of environmental impacts are often based on the presumption of a ‘balance of nature’. Environments vary in time and space, however, and this invalidates the assumption of equilibrium and complicates study design. Natural variability also influences the likelihood that a study design will suffer from pseudoreplication due to non-independence of samples, and it affects the power of statistical tests and the effect size that can be documented. I evaluate the degree to which assumptions of temporal or spatial equilibrium are contained in various study designs for assessing environmental impacts and determining recovery. Traditional before-after or treatment-control designs rely on assumptions of a steady-state equilibrium in time or space and may be of limited value. Other designs that involve comparisons among paired sites or multiple-time sampling from areas exposed to different perturbation intensities have greater capacity to separate the effects of natural variation from those of the perturbation and may be less sensitive to pseudoreplication. Coping with variability in environmental impact assessment requires careful attention to the assumptions inherent in study designs and careful consideration of the relationships between variability, pseudoreplication and power.
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References
Wiens, J. A. and Parker, K. R. (1995) Analyzing the effects of accidental environmental impacts: approaches and assumptions. Ecological Applications, 5, 1069–83.
Egerton, F. N. (1973) Changing concepts of the balance of nature. Quarterly Review of Biology, 48, 322–50.
Wiens, J. A. (1984) On understanding a non-equilibrium world: myth and reality in community patterns and processes, in Ecological Communities: Conceptual Issues and the Evidence (eds D. R. Strong, D. Simberloff, L. G. Abele and A. B. Thistle), Princeton University Press, Princeton, pp. 439–57.
DeAngelis, D. L. and Waterhouse, J. C. (1987) Equilibrium and nonequilibrium concepts in ecological models. Ecological Monographs, 57, 1–21.
Chesson, P. L. and Case, T. J. (1986) Overview: nonequilibrium community theories: chance, variability, history, and coexistence, in Community Ecology (eds J. Diamond and T. J. Case), Harper and Row, New York, pp. 229–39.
Crawley, M.J. (1990) The population dynamics of plants. Philosophical Transactions of the Royal Society of London B, 330, 125–40.
Shepherd, J. G. and Cushing, D. H. (1990) Regulation in fish populations: myth or mirage? Philosophical Transactions of the Royal Society of London B, 330, 151–64.
Marchant, J. H., Hudson, R., Carter, S. P. and Whittington, P. (1990) Population Trends in British Breeding Birds, British Trust for Ornithology, Tring, Hertfordshire, UK.
Grieg-Smith, P. (1979) Pattern in vegetation. Journal of Ecology, 55, 483–503.
Grieg-Smith, P. (1983) Quantitative Plant Ecology, 3rd edn, University of California Press, Berkeley.
Kolasa, J. and Pickett, S. T. A. (eds) (1991) Ecological Heterogeneity, Springer-Verlag, New York.
Wiens, J. A. (1995) Landscape mosaics and ecological theory, in Mosaic Landscapes and Ecological Processes (eds L. Hansson, L. Fahrig and G. Merriam), Chapman & Hall, London, pp. 1–26.
Gilpin, M. and Hanski, I. (1991) Metapopulation Dynamics: Empirical and Theoretical Investigations, Academic Press, London.
Blakers, M., Davies, S. J. J. F. and Reilly, P. N. (1984) The Atlas of Australian Birds, Melbourne University Press, Melbourne.
Cyrus, D. and Robson, N. (1980) Bird Atlas of Natal, University of Natal Press, Pietermaritzburg.
Gibbons, D. W., Reid, J. B. and Chapman, R. A. (1993) The New Atlas of Breeding Birds in Britain and Ireland: 1988–1991, T & AD Poyser, London.
Hyytiä, K., Koistinen, J. and Kellomäki, E. (1983) Suomen Lintuatlas, Lintutieto Oy, Helsinki.
Robbins, C. S., Bystrak, D. and Geissler, P. H. (1986) The Breeding Bird Survey: Its First Fifteen Years, 1965–1979, United States Department of the Interior, Fish and Wildlife Service, Resource Publication 157, Washington, DC.
Levin, S. A. (1992) The problem of pattern and scale in ecology. Ecology, 73, 1943–67.
Cairns Jr, J. (1990) Lack of theoretical basis for predicting rate and pathways of recovery. Environmental Management, 14, 517–26.
Hastings, A., Horn, C. L., Ellner, S., Turchin, P. and Godfray, H. C. J. (1993) Chaos in ecology: is mother nature a strange attractor? Annual Review of Ecology and Systematics, 24, 1–33.
Hastings, A. and Higgins, K. (1994) Persistence of transients in spatially structured ecological models. Science, 263, 1133–6.
Link, W. A. and Nichols, J. D. (1994) On the importance of sampling variance to investigations of temporal variation in animal population size. Oikos, 69, 539–44.
Osenberg, C. W., Schmitt, R. J., Holbrook, S. J., Anu-Saba, K. E. and Flegal, A. R. (1994) Detection of environmental impacts: natural variability, effect size, and power analysis. Ecological Applications, 4, 16–30.
Schroeter, S. C, Dixon, J. D., Kastendiek, J. and Smith, R. O. (1993) Detecting the ecological effects of environmental impacts: a case study of kelp forest invertebrates. Ecological Applications, 3, 331–50.
Skalski, J. R. and McKenzie, D. H. (1982) A design for aquatic monitoring programs. Journal of Environmental Management, 14, 237–51.
Exxon Valdez Trustee Council (1993) Draft Restoration Plan. Exxon Valdez Trustee Council, Anchorage, AK.
Wiens, J. A. (1995) Recovery of seabirds following the Exxon Valdez oil spill: an overview, in The Exxon Valdez Oil Spill: Environmental Impact and Recovery Assessment (eds P. G. Wells, J. N. Butler and J. S. Hughes), Special Technical Publication 1219, American Society for Testing and Materials, Philadelphia, PA, pp. 854–93.
Dutilleul, P. (1993) Spatial heterogeneity and the design of ecological field experiments. Ecology, 74, 1646–58.
Eberhardt, L. L. and Thomas, J. M. (1991) Designing environmental field studies. Ecological Monographs, 61, 53–73.
Hurlbert, S. H. (1984) Pseudoreplication and the design of ecological field experiments. Ecological Monographs, 54, 187–211.
Morrisey, D. J. (1993) Environmental impact assessment — a review of its aims and recent developments. Marine Pollution Bulletin, 26, 540–5.
Shrader-Frechette, K. S. and McCoy, E. D. (1993) Methods in Ecology: Strategies for Conservation, Cambridge University Press, Cambridge.
Skalski, J. R. and Robson, D. S. (1992) Techniques for Wildlife Investigations, Academic Press, San Diego, CA.
Stewart-Oaten, A., Bence, J. R. and Osenberg, C. W. (1992) Assessing effects of unreplicated perturbations: no simple solutions. Ecology, 73, 1396–404.
Underwood, A. J. (1993) The mechanics of spatially replicated sampling programmes to detect environmental impacts in a variable world. Australian Journal of Ecology, 18, 99–116.
Underwood, A. J. (1994) On beyond BACI: sampling designs that might reliably detect environmental disturbances. Ecological Applications, 4, 3–15.
Day, R. H., Murphy, S. M., Wiens, J. A., Hayward, G. D., Harner, E. J. and Smith, L. N. (1995) Use of oil-affected habitats by birds’ after the Exxon Valdez oil spill, in The Exxon Valdez Oil Spill: Environmental Impact and Recovery Assessment (eds P. G. Wells, J. N. Butler and J. S. Hughes), Special Technical Publication 1219, American Society for Testing and Materials, Philadelphia, PA, pp. 726–61.
Magnuson, J. J., Benson, B. J. and Kratz, T. K. (1990) Temporal coherence in the limnology of a suite of lakes in Wisconsin, U.S.A. Freshwater Biology, 23, 145–59.
Stewart-Oaten, A., Murdoch, W. W. and Parker, K. R. (1986) Environmental impact assessment: ‘pseudoreplication’ in time? Ecology, 67, 929–40.
Fairweather, P. G. (1993) Links between ecology and ecophilosophy, ethics and the requirements of environmental management. Australian Journal of Ecology, 18, 3–19.
Wiens, J. A. (1989) Spatial scaling in ecology. Functional Ecology, 3, 385–97.
Peterman, R. M. (1989) Statistical power analysis can improve fisheries research and management. Canadian Journal of Fisheries and Aquatic Sciences, 47, 2–15.
Krebs, C. J. (1991) The experimental paradigm and long-term population studies. Ibis, 133 (Suppl), 3–8.
Greenwood, J. J. D. and Baillie, S. R. (1991) Effects of density-dependence and weather on population changes of English passerines using a non-experimental paradigm. Ibis, 133 (Suppl.), 121–33.
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Wiens, J.A. (1996). Coping with variability in environmental impact assessment. In: Baird, D.J., Maltby, L., Greig-Smith, P.W., Douben, P.E.T. (eds) ECOtoxicology: Ecological Dimensions. Chapman & Hall Ecotoxicology Series. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1541-1_6
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DOI: https://doi.org/10.1007/978-94-009-1541-1_6
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