ADAPTIVE SEX ALLOCATION IN A SIMULTANEOUS HERMAPHRODITE
نویسندگان
چکیده
منابع مشابه
Sex allocation predicts mating rate in a simultaneous hermaphrodite.
Sexual selection theory for separate-sexed animals predicts that the sexes differ in the benefit they can obtain from multiple mating. Conventional sex roles assume that the relationship between the number of mates and the fitness of an individual is steeper in males compared with females. Under these conditions, males are expected to be more eager to mate, whereas females are expected to be ch...
متن کاملPhenotypically plastic adjustment of sex allocation in a simultaneous hermaphrodite.
Sex allocation theory for simultaneous hermaphrodites predicts an influence of the mating group size on sex allocation. Mating group size may depend on the size of the group in which an individual lives, or on the density, but studies to date have not distinguished between the two factors. We performed an experiment in which we raised a transparent simultaneous hermaphrodite, the flatworm Macro...
متن کاملResource-dependent sex-allocation in a simultaneous hermaphrodite.
Most sex allocation theory is based on the relationship between the resource investment into male and female reproduction and the consequent fitness returns (often called fitness-gain curves). Here we investigate the effects of resource availability on the sex allocation of a simultaneously hermaphroditic animal, the free-living flatworm Macrostomum lignano. We kept the worms under different re...
متن کاملPhenotypically flexible sex allocation in a simultaneous hermaphrodite.
Previous studies on sex allocation in simultaneous hermaphrodites have typically focused either on evolutionary or one-time, ontogenetic optimization of sex allocation, ignoring variation within an individual's lifetime. Here, we study whether hermaphrodites also possess facultative sex allocation, that is, a phenotypic flexibility, allowing them to distribute resources to either sex in an oppo...
متن کاملSex allocation adjustment to mating group size in a simultaneous hermaphrodite.
Sex allocation theory is considered as a touchstone of evolutionary biology, providing some of the best supported examples for Darwinian adaptation. In particular, Hamilton's local mate competition theory has been shown to generate precise predictions for extraordinary sex ratios observed in many separate-sexed organisms. In analogy to local mate competition, Charnov's mating group size model p...
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ژورنال
عنوان ژورنال: Evolution
سال: 1999
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1999.tb05423.x