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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/13023 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/13023 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/13023 archive 351 disk0/00/00/80/25 2016-01-15 08:38:54 2021-08-27 17:19:35 2016-01-15 08:38:54 monograph show 3 Rueffler C. Egas M. 7674 Metz J.A.J. 7506 pub iis_ecl prog_eep Recent theoretical studies have analyzed the evolution of habitat specialization using either the logistic or the Ricker equation. These studies have implemented evolutionary change directly in population-level parameters such as habitat-specific intrinsic growth rates r or carrying capacities K. This approach is a shortcut to a more detailed analysis where evolutionary change is studied in underlying morphological, physiological, or behavioral traits at the level of the individual that contribute to r or K. Here we describe two pitfalls that can occur when such a shortcut is employed. First, population-level parameters that appear as independent variables in a population dynamical model might not be independent when derived from processes at the individual level. Second, patterns of covariation between individual-level traits are usually not conserved when mapped to the level of demographic parameters. Nonlinear mappings constrain the curvature of trade-offs that can sensibly be assumed at the population level. To illustrate these results, we derive a two-habitat version of the logistic and Ricker equations from individual-level processes and compare the evolutionary dynamics of habitat-specific carrying capacities with those of underlying individual-level traits contributing to the carrying capacities. Finally, we sketch how our viewpoint affects the results of earlier studies. 2006-12 published IR-06-074 IR-06-074 1229 206 public interim_report IIASA, Laxenburg, Austria 34 FALSE info:eu-repo/semantics/book