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metapopulations in a fragmented agricultural landscape. Oikos 61:149–156.
Verner, J., M.L. Morrison, and C.J. Ralph, editors. 1986. Wildlife 2000: Modeling
Habitat Relationships of Terrestrial Vertebrates. University of Wisconsin Press,
Madison, Wisconsin, USA.
Walthall, W.K. and J.D. Start. 1997. Comparison of two population-level ecotoxicological endpoints: The intrinsic (r m ) and instantaneous (r i ) rates of increase.
Environmental Toxicology and Chemistry 16:1068–1073.
262
Lev Ginzburg and H. Resit Akçakaya