Demographic Toxicity: Methods in Ecological R Assessment by H. Resit Akcakaya, John D. Stark, Todd S. Bridges

By H. Resit Akcakaya, John D. Stark, Todd S. Bridges

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Quantitative Conservation Biology: Theory and Practice of Population Viability Analysis. Sinauer Associates, Sunderland, Massachusetts. Munns, W. , D. E. Black, T. R. Gleason, K. Salomon, D. Bengtson, and R. Gutjahr-Gobell. 1997. Evaluation of the effects of dioxin and PCBs on Fundulus heteroclitus populations using a modeling approach. Environmental Toxicology and Chemistry 16:1074–1081. Pastorok, R. , S. M. Bartell, S. Ferson, and L. R. Ginzburg (editors). 2002. Ecological Modeling in Risk Assessment: Chemical Effects on Populations, Ecosystems, and Landscapes.

J. Gutierrez, and H. R. Akçakaya. 1994. Spotted owl meta-population dynamics in Southern California. Journal of Animal Ecology 63:775–785. , H. Caswell, T. Bridges, C. DiBacco, D. Cabrera, and G. Plaia. 1996. Demographic responses of estuarine polychaetes to pollutants: life table response experiments. Ecological Applications 6:1295–1313. McCarthy, M. , and L. S. Broome. 2000. A method for validating stochastic models of population viability: a case study of the mountain pygmy-possum (Burramys parvus).

Model simulations show that as the degree of larval aggregation increases, the number of sheep that are struck decreases. This suggests that higher heterogeneity in susceptibility within a sheep flock (or heterogeneity in habitat suitability, from the flies’ point of view) restricts strikes to relatively few sheep (Fenton et al. 1999). Natural sheep blowfly populations should therefore be very suitable for metapopulation modeling in RAMAS, including, for example, stage-specific differences in migration rates and density dependence.

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