Evolution of sexual size monomorphism: the influence of passive mate guarding

  title={Evolution of sexual size monomorphism: the influence of passive mate guarding},
  author={April Dunham and Volker H. W. Rudolf},
  journal={Journal of Evolutionary Biology},
  • A. Dunham, V. Rudolf
  • Published 1 July 2009
  • Biology, Psychology
  • Journal of Evolutionary Biology
Some species have potential for intense mate competition yet exhibit little or no sexual size dimorphism, despite predictions from sexual selection theory. Using a conceptual model, we show the conditions for which passive mate guarding with copulatory plugs can be an alternative and more successful strategy to active (direct) guarding, reducing selection pressure on large male size. The model predicts that copulatory plugs in mammals should be favoured in species for which females have short… 
Function of copulatory plugs in house mice: mating behavior and paternity outcomes of rival males
Investigating whether repeated ejaculation affects plug size in a mammalian model species, the house mouse, found that plug size decreased over repeated ejaculations so that time since last ejaculation can be applied as an approximation for plug size.
Mammalian sexual dimorphism.
Is sexual monomorphism a predictor of polygynandry? Evidence from a social mammal, the collared peccary
This work test the prediction that sexual monorphism is associated with polygynandry in the collared peccary (Pecari tajacu, Tayassuidae), a social ungulate closely related to the old-world suids, and suggests thatSexual monomorphism may either select for or be an evolutionary consequence of a promiscuous mating system.
Body size and sexual size dimorphism in primates: influence of climate and net primary productivity
Investigating the role of seasonality, interannual variability and annual measures of temperature and rainfall, and net primary productivity on patterns of body size and sexual size dimorphism across 130 species of primates found no support for a role of environmental constraints in moderating sexual sizeDimorphism at the interspecific level.
Meiotic drive changes sperm precedence patterns in house mice: potential for male alternative mating tactics?
It is confirmed that +/t males are weak sperm competitors when first to mate and whether males of different genotypes differ in reproductive tactics to maximise individual or driver fitness is addressed, as well as the mechanistic basis for alternative sperm precedence patterns in this species.
Evolutionary dynamics of sexual size dimorphism in non-volant mammals following their independent colonization of Madagascar
It is concluded that neither the eco-evo-devo hypothesis, founder effects, the island rule nor sexual selection theory alone can provide a compelling explanation for the observed patterns of SSD in Malagasy mammals.
Male–Male Competition in a Mixed‐Mating Fish
Test the importance of male size, colour and heterozygosity in predicting the outcome of male–male competition using the mangrove rivulus, which has a male-hermaphrodite mixed-mating system and suspects that male colour may prove to be more important in mate choice than it was found to be in intrasexual competition.
Genital morphology linked to social status in the bank vole (Myodes glareolus)
It is concluded that dominant male bank voles may benefit from an enlarged baculum under sperm competition and/or cryptic female choice and that differences in penile morphology according to male social status might be important but as yet largely unexplored source of variation in male reproductive success.


Selected polyandry: female choice and inter-sexual conflict in a small nocturnal solitary primate (Microcebus murinus)
Females exhibited a mixed mating strategy, avoiding costly direct mate choice but still counteracting male efforts to monopolize mating, successfully increasing genetic variability among offspring.
Sexual Dimorphism, the Operational Sex Ratio, and the Intensity of Male Competition in Polygynous Primates
A weight-corrected measure of sexual dimorphism and a biologically realistic assay of mating competition, the operational sex ratio, are employed to reexamine the factors favoring the evolution of sexual sizeDimorphism in primates and produce results consistent with the sexual selection hypothesis.
  • Jeremy A. Miller
  • Biology
    Evolution; international journal of organic evolution
  • 2007
It is reported that male genital mutilation is significantly correlated with sacrifice behavior and argued that this finding is consistent with sexual cannibalism theory.
Sexual selection and genital anatomy of male primates
It seems that either penile spines have several functions, or penile spinosity in primates, and other orders, remains to be explained.
Sperm competition risk and male genital anatomy: comparative evidence for reduced duration of female sexual receptivity in primates with penile spines
Analysis of relationships between male penile anatomy and the duration of female sexual receptivity in primates suggests a new potential function for mammalian penile spines in the context of sexual selection, and adds to growing evidence that sperm competition and associated sexual conflict are important selection pressures in the evolution of animal genitalia.
Sexual Dimorphism in Mammals: Avian Models and Unanswered Questions
  • K. Ralls
  • Biology
    The American Naturalist
  • 1977
An adequate mammalian model will have to include another set of factors which oppose the evolution of polygyny by increasing the spacing or mobility of females, and explain why sexual dimorphism has evolved more frequently in large mammals than in small ones.
Phylogenetic analyses of primate size evolution: the consequences of sexual selection
An independent contrast analysis of male and female size (log weight) showed that these are tightly correlated and that size dimorphism is not a simple allometric function of size, and the directional investigation indicates that the magnitude of change in haplorhine dimorphisms is larger after an increase in sexual selection than after a decrease.
Sexual Selection and Lemur Social Systems
Compared analyses suggest that intrasexual selection is of similar intensity in both monogamous and polygynous lemurs, but sexual selection theory alone cannot provide a sufficient explanation for the evolution of female dominance.
Sex in the dark: determinants and consequences of mixed male mating tactics in Microcebus murinus, a small solitary nocturnal primate
It is found that, with a given relatively low overall monopolization potential, successful male mouse lemurs roamed extensively in search of mates, had superior finding ability and mated as early as possible, however, contest competition was important too, as temporary monopolization was also possible.