Persistence of an extreme male‐biased adult sex ratio in a natural population of polyandrous bird

@article{Kosztolnyi2011PersistenceOA,
  title={Persistence of an extreme male‐biased adult sex ratio in a natural population of polyandrous bird},
  author={A. Kosztol{\'a}nyi and Z. Barta and C. K{\"u}pper and T. Sz{\'e}kely},
  journal={Journal of Evolutionary Biology},
  year={2011},
  volume={24}
}
In a number of insects, fishes and birds, the conventional sex roles are reversed: males are the main care provider, whereas females focus on matings. The reversal of typical sex roles is an evolutionary puzzle, because it challenges the foundations of sex roles, sexual selection and parental investment theory. Recent theoretical models predict that biased parental care may be a response to biased adult sex ratios (ASRs). However, estimating ASR is challenging in natural populations, because… Expand
Increased male bias in eider ducks can be explained by sex-specific survival of prime-age breeders
TLDR
The present study examines potential demographic mechanisms for the recent dramatic shift from a slight female bias among adult eider ducks to a male bias in the Baltic Sea and highlights the importance of considering population structure and age-specific vital rates when assessing population dynamics and management targets. Expand
Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth
TLDR
A detailed individual-based demographic analysis of an intensively studied wild bird population to evaluate origins of sex biases and their consequences on mating strategies and population dynamics suggests sex-biased early survival may contribute toward mating system evolution and population persistence. Expand
Sex-biased survival predicts adult sex ratio variation in wild birds
TLDR
Using phylogenetic analyses of 187 avian species from 59 families, it is shown that neither hatching sex ratios nor fledging sex ratios correlate with ASR, however, sex-biased adult mortality is a significant predictor of ASR and this relationship is robust to 100 alternative phylogenetic hypotheses, and potential ecological and life-history confounds. Expand
Female bias in the adult sex ratio of African annual fishes: interspecific differences, seasonal trends and environmental predictors
TLDR
The effect of environmental conditions on adult sex ratio variation is concluded, implying most severe male mortality early after maturation, declining later perhaps with a decrease in male abundance. Expand
Female bias in the adult sex ratio of African annual fishes: interspecific differences, seasonal trends and environmental predictors
TLDR
The effect of environmental conditions on adult sex ratio varies dramatically even in closely related and ecologically similar sympatric species, and difficulties in explaining the ecological predictors of sex ratio biases are likely due to high stochasticity rather than limited sample size. Expand
Natal habitat and sex-specific survival rates result in a male-biased adult sex ratio
Abstract The adult sex ratio (ASR) is a crucial component of the ecological and evolutionary forces shaping the dynamics of a population. Although in many declining populations ASRs have beenExpand
Adult sex ratio bias in snowy plovers is driven by sex-specific early survival: implications for mating systems and population growth
TLDR
It is shown that a strongly male-biased ASR is primarily driven by sex-specific survival of juveniles, rather than adults or dependent offspring, which provides empirical support for theories of unbiased sex allocation when sex-differences in survival arise after the period of parental investment. Expand
Sex Ratio and Sex-Specific Survival in Avian Populations: A Review
Abstract An analysis of sex ratio in adult birds of 196 species showed that of 308 reliable estimates, most were male-biased. Primary sex ratio (at fertilization and in clutches) was equal, butExpand
Estimating adult sex ratios in nature
TLDR
It is recommended that detection-based methods be used for estimating ASR in most situations, and it is pointed out that studies are needed that compare different ASR estimation methods and control for sex differences in dispersal. Expand
Sex differences in age‐to‐maturation relate to sexual selection and adult sex ratios in birds
TLDR
It is suggested that both social environment and mate competition influence the evolution of a major life history trait, maturation, and phylogenetic path analyses suggest that adult sex ratio drives interspecific changes in the intensity of sexual selection which, in turn, influences maturation. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 45 REFERENCES
Unusually dynamic sex roles in a fish
TLDR
This is the first time that a shift in sex roles has been shown in a vertebrate, and it might be explained by a large decline in male abundance, strongly skewing the sex ratio towards females. Expand
Male-skewed adult sex ratio, survival, mating opportunity and annual productivity in the Snowy Plover Charadrius alexandrinus
TLDR
The results suggest that in C. alexandrinus a sex difference in adult survival results in a male-skewed sex ratio, which creates more nesting opportunities and greater annual productivity for females than for males. Expand
Brood sex ratio in the Kentish plover
TLDR
The results suggest that the mortality of daughters was higher than that of the sons shortly after hatching, suggesting that the female-biased mating opportunities in the Kentish plover are not due to biased brood sex ratio at hatching but, at least in part, are due to female- biased chick mortality soon after hatch. Expand
SOCIAL POLYANDRY, PARENTAL INVESTMENT, SEXUAL SELECTION, AND EVOLUTION OF REDUCED FEMALE GAMETE SIZE
  • M. Andersson
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 2004
TLDR
A quantitative genetic model predicts that female scrambles over mates lead to evolution of reduced female gamete size, and suggests that the influence is mutual: owing to a coevolutionary feedback loop, sexual selection in females also shapes initial parental investment by reducing egg size. Expand
Demographic origins of skewed operational and adult sex ratios: perturbation analyses of two-sex models.
TLDR
Female local juvenile survival contributed the most to the unbalanced OSR and ASR due to a female-biased dispersal rate, suggesting sexual differences in philopatry can influence sex ratios more strongly than the cost of reproduction. Expand
Parental investment, sexual selection and sex ratios
TLDR
An integrative model shows how factors interact to generate sex roles and underscores the need to distinguish between the ASR and the operational sex ratio (OSR) if mortality is higher when caring than competing this diminishes the likelihood of sex role divergence. Expand
Female‐biased dispersal, low female recruitment, unpaired males, and the extinction of small and isolated bird populations
TLDR
Predicting how female-biased natal dispersal may differentially affect the extinction risk of populations and species with contrasting distributions, migratory behaviours, life histories and mating systems finds vulnerability to extinction should be greater for migratory than for resident species and greater for short-lived than for long-lived species. Expand
Adult sex ratios in wild bird populations
TLDR
There is currently no quantitative evidence that an ASR of one male to one female represents the norm in birds, and estimates of ASR in wild bird populations may be subject to a number of biases, which are discussed. Expand
Evolution of Classical Polyandry: Three Steps to Female Emancipation
TLDR
Evolution of classical polyandry appears to have followed these steps in shorebirds, coucals and pipefishes, but the reasons why certain species differ from their close phylogenetic relatives in being polyandrous are far from clear. Expand
Brood desertion in Kentish plover sex differences in remating opportunities
TLDR
It is proposed that the remating opportunities in Kentish plovers were influenced by the male-biased adult sex ratio and the seasonal decrease in the number of breeders and it is demonstrated that measuring remating times is a more direct measure of mating opportunities than calculating the operational sex ratio. Expand
...
1
2
3
4
5
...