Sex ratio genetics and the competitiveness of parasitic wasps |
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Authors: | Veijo Kaitala Wayne M Getz |
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Institution: | (1) Systems Analysis Laboratory, Helsinki University of Technology, Otakaari 1, SF-02150 Espoo, Finland;(2) Department of Entomology, University of California, 94720 Berkeley, CA, U.S.A. |
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Abstract: | In the first part of the paper we analyse dynamics of the genetic mechanisms responsible for maintaining biased sex ratios
in host-parasitoid interactions. We begin by reviewing recent results relating to the maintenance of sibmating in haplo-diploid
populations. We then investigate the evolutionary stable sex ratio in populations in which all or some of the females mate
with their brothers. In particular, we derive a diallelic one-locus model for studying evolutionary stable sex ratios in partially
sibmating haplo-diploid populations. In the second part of the paper we review the impact of sex ratio on host-parasitoid
populations. We then analyse how the sex ratio strategy of one parasitoid species may affect its interaction with another
parasitoid species competing for the same host. In particular we show that, although a female biased sex ratio may enhance
the inherent competitiveness of one species, it may also destabilize the ecological interaction of the three species so that
all become extinct. |
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