This site uses cookies. By continuing, your consent is assumed. Learn more

124.9fm shares

Intersexual competition

opinion

March 17, ; Accepted: In polygynous mammals, it is commonly observed that both sex ratios Intersexual competition birth and dispersal are male biased.

This has been interpreted as resulting from low female dispersal causing high female local resource competition, which would select for male-biased sex ratios. However, a female-biased sex ratio can be selected despite lower female than male-biased dispersal. This will occur if the low female Intersexual competition is close to the optimal dispersal rate, while the male dispersal is not close to the optimal dispersal rate.

The actual outcome depends on the joint evolution of sex-biased dispersal and sex ratio. Earlier analyses of joint evolution imply that there will be no sex-ratio nor dispersal biases at the joint evolutionarily stable strategy, thus they do not explain the data.

However, these earlier analyses assume no intersexual competition for resources. Here, we show that when males and females compete with each other for access to resources, male-biased dispersal will be associated with male-biased birth sex ratio, as is commonly observed. A trend toward male-biased birth sex ratios is also expected if there is intersexual local resource competition and if birth sex ratio is constrained so that it cannot depart from balanced sex ratio.

Demographic stochasticitylocal mate competitionlocal resource competitionmating systems. Sign Up for E-alerts. Alert me when this article is cited: Looking for a job?

Visit the BioOne Career Center and apply to Intersexual competition positions across the sciences. Log in Admin Help. The Society for the Study of Evolution Received: Abstract In polygynous mammals, it is commonly "Intersexual competition" that both sex ratios at birth and dispersal are male biased.

The idea of cumbersome traits...

Analysis of disruptive Intersexual competition in subdivided populations. Higher fitness for philopatric than for immigrants males in a semi-isolated population of great warblers. Evidence for Intersexual competition wild female chimpanzees investing more in sons. Sex ratio and local resource competition in a prosimian primate. Sex biases in avian dispersal: Sex ratio variation in mammals.

Parental investment in male and female offspring in polygynous mammals. Population structure inhibits evolutionary diversification under competition for resources. Competition for mates and predominant juvenile male dispersal in mammals. On the changing concept of evolutionary population stability as a reflection of a changing point of view in the quantitative theory of evolution.

Foundations of social evolution.

Kin competition, the cost of inbreeding and the evolution of dispersal. Evolution of stepping stone dispersal rates. Differential dispersal, local resource competition, and sex ratio variation Intersexual competition birds.

A geometric view of relatedness. Mating systems, philopatry and dispersal in birds and mammals. The genetical evolution of social behavior. Selfish and spiteful behaviour in an evolutionary model. A new approach to study dispersal: Monte Carlo sampling methods using Markov chains and their applications. Evolution of migration rate in a spatially realistic metapopulation model. Successful sons or advantaged daughters?

The Trivers-Willard model and sex-biased maternal investment in ungulates. Contradictory findings in studies of sex ratio variation in roe deer Capreolus capreolus.

Male-male relationships among wild bonobos Pan paniscus at Wamba, Republic of Zaire. Dispersal and sex ratio at birth in primates.

Sexual selection is a mode...

Population density affects sex ratio variation in red deer. Inbreeding avoidance through kin recognition: Convergence stability, probabilities of fixation, and the ideal free distribution in a class-structured population. Joint evolution of sex ratio and dispersal: Sex ratio and maternal rank in wild spider monkeys: How should we define fitness in structured metapopulation models?

Including an application to the Intersexual competition of evolutionarily stable dispersal strategies. Avoiding inbreeding and sibling competition: A re-evaluation of factors influencing the sexratio of spider monkey populations with new data from Maraca Island, Brazil.

Quasireplication and the contract of error: Male philopatry confers a mating advantage in the migratory collared flycatcher, Fiducela albicollis.

Dispersal and inbreeding "Intersexual competition." Local competition, inbreeding, and the evolution Intersexual competition sex-biased dispersal.

Local extinction and the evolution of dispersal rates: Intersexual niche differentiation in the blue tit Parus caeruleus. Kin selection and natal dispersal in an age-structured population.

Intersexual competition and relatedness coefficients: What do they measure? Genetic structure and selection in subdivided populations. A theoretical basis for measures of kin selection in subdivided populations: Inclusive fitness for traits affecting metapopulation demography. Local resource competition and facultative adjustement of sex ratios in relation to competitive abilities. A comparative study of population density and sexual size dimorphism in lizards. An inclusive fitness model for dispersal of offspring.

Sex ratio in a stepping stone Intersexual competition with sex-specific dispersal.

News feed