Evol Ecol Res 2: 525-545 (2000)     Full PDF if your library subscribes.

On the product mean fitness and population growth in sexual and asexual populations

H. Manos,1 U. Liberman1 and Marcus W. Feldman2

1School of Mathematical Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel and 2Department of Biological Sciences, Stanford University, Stanford, CA 94305-5020, USA

Author to whom all correspondence should be addressed.
e-mail: marc@charles.stanford.edu


We examine situations that have frequently been invoked as advantageous for sex. In a constant environment with one diallelic locus determining viability that differs between the sexes, complete genotypic frequency dynamics are obtained in a symmetric case. The product of male and female mean fitnesses may not increase over time. In models with periodic or random environments, the numbers of sexuals and asexuals in pure populations of each can be compared. In agreement with previous studies, sexual populations are shown to grow at a faster rate than asexual populations.

Keywords: failure of optimality, global stability, multiple equilibria, population size, random environments.

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        © 2000 Marcus W. Feldman. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.

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