Demography of source—sink populations and the evolution of ecological niches
- Tadeusz J. Kawecki
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The demography of populations living in variable environments is an important factor molding the evolution of ecological niches, for it determines the relative strength of selection pressures on adaptations to different habitats. Here I consider a coarse-grained environment consisting of two habitat types and investigate how the selection pressure on reproductive success in different habitats depends on their quality and frequency and the dispersal pattern. The results suggest that selection on adaptations to optimal habitats will usually be stronger than on adaptations to poor habitats and the ecological niche will thus tend to be an evolutionarily conservative character. It is because under the habitat choice or limited dispersal that seem to prevail in natural populations, more individuals encounter the better habitat than would be expected solely on the basis of its relative area. This bias results in reduced selection pressure on reproductive success in the poorer habitat. With habitat choice or limited dispersal, selection pressure on reproductive success in the poorer habitat may exceed that on reproductive success in the better habitat only if the poorer habitat is much more frequent in the environment than the better habitat and the difference in their quality is not large.
- Brown, J.S. and Pavlovic, N.B. (1992) Evolution in heterogeneous environments: effects of migration on habitat specialization.Evol. Ecol. 6, 360–82.
- Caswell, H. (1989)Matrix Population Models. Sinauer, Sunderland, MA.
- Fretwell, S.D. and Lucas, H.L. Jr (1970) On territorial behavior and other factors influencing habitat distribution in birds. I. Theoretical development.Acta Biotheor. 19, 16–36.
- Holt, R.D. (1985) Population dynamics in two-patch environments: some anomalous consequences of an optimal habitat distribution.Theor. Pop. Biol. 28, 181–208.
- Holt, R.D. (1987) Population dynamics and evolutionary processes: the manifold roles of habitat selection.Evol. Ecol. 1, 331–47.
- Holt, R.D. and Gaines, M.S. (1992) Analysis of adaptation in heterogeneous landscapes: implications for the evolution of fundamental niches.Evol. Ecol. 6, 433–47
- Kawecki, T.J. and Stearns, S.C. (1993) The evolution of life histories in spatially heterogeneous environments: optimal reaction norms revisited.Evol. Ecol. 7, 155–74.
- Lande, R. (1982) A quantitative genetic theory of life history evolution.Ecology 63, 607–15.
- Levins, R. (1968)Evolution in Changing Environments. Princeton University Press, Princeton, NJ.
- Parsons, P.A. (1987) Evolutionary rates under environmental stress.Evol. Biol. 21, 311–47.
- Pulliam, H.R. (1988) Sources, sinks, and population regulation.Am. Nat. 132, 652–61.
- Rosenzweig, M.L. (1987) Habitat selection as a source of biological diversity.Evol. Ecol. 1, 315–30.
- Via, S. and Lande, R. (1985) Genotype—environment interaction and the evolution of phenotypic plasticity.Evolution 39, 505–22.
- Demography of source—sink populations and the evolution of ecological niches
Volume 9, Issue 1 , pp 38-44
- Cover Date
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- Online ISSN
- Kluwer Academic Publishers
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- ecological niche
- heterogeneous environments
- natural selection
- source—sink populations
- Industry Sectors
- Author Affiliations
- 1. Institute of Zoology, University of Basel, Rheinsprung 9, CH-4051, Basel, Switzerland