Corpus ID: 8466932

Reproductive rates , operational sex ratios and mate choice in St .

@inproceedings{Fish1996ReproductiveR,
  title={Reproductive rates , operational sex ratios and mate choice in St .},
  author={Peter Fish},
  year={1996}
}
Operational sex ratio (OSR) theory predicts that sexual differences in potential reproductive rates (PRRs) create biases in the OSR and thus determine the relative strength of sexual selection (competition and choice) operating on each sex. Although this theory is well accepted, empirical studies that quantify it are still lacking. This paper presents such a study. I measured the natural OSR of Galilee St. Peter’s fish (Sarotherodon galilaeus) in the field (Lake Kinneret) and examined the… Expand
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For a few males more: do changes in sex ratio predict reproductive success and offspring survival?
TLDR
Although each female produced a single clutch regardless of sex ratio, higher proportions of males depressed the average number of clutches per male, indicating adult male competition and sexual conflict reduce the fitness of both males and females. Expand
The influence of operational sex ratio on the mating behaviour of reindeer (Rangifer tarandus L.) during an experimental rut: the effect of male age
TLDR
The results suggest that age is an important factor with respect to how male reindeer respond to differing OSR values, and future research aiming to expand the generalizability of experimental OSR theory to a wider range of taxa and ecological conditions need to consider other factors that will impact competition for mates, such as prime reproductive age. Expand
Mating distribution and its temporal dynamics affect operational sex ratio: a simulation study
TLDR
The OSR was influenced by the distribution of matings in time and among males when the male mating phase was limited by a parental phase and was shaped by the numbers of males and females and their capacities for collateral investment. Expand
Breeding system evolution in relation to adult sex ratios
TLDR
It is shown that in a wild polygamous plover population these ratios seem to be uncorrelated, and ASR was better than OSR at predicting the duration of female brood care in a polygamy plover where females have variable care and the contribution of these results to the understanding of breeding system evolution is discussed. Expand
Sex Ratio and Mating Behavior in the Calanoid Copepod Pseudodiaptomus annandalei
TLDR
Although the sex ratio is supposed to induce a modification in mate guarding, no differences were found here, which is in agreement with theoretical models that predict a possible slackening of mate selection when encounters are mate limited. Expand
The Behavioral Ecology of Sex Tourism: The Consequences of Skewed Sex Ratios
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The author demonstrates that male-skewed sex ratios increase men’s sex tourism rationalization and intent, while women’'s predispositions are not sensitive to sex ratios. Expand
PARENTAL ROLES AND THE AMOUNT OF CARE IN A BI-PARENTAL SUBSTRATE BROODING CICHLID: THE EFFECT OF SIZE DIFFERENCES WITHIN PAIRS
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The amount of parental care is largely affected by the relative size within pairs independent of sex in J. ornatus, and observations of aggressive behaviours within pairs suggest that the larger fish are likely to make the partners perform parental care. Expand
The effect of male coloration on female mate choice in closely related Lake Victoria cichlids (Haplochromis nyererei complex)
TLDR
Male coloration in haplochromine cichlids does underlie sexual selection by direct mate choice, involving the capacity for individual assessment of potential mates by the female, and may explain rapid speciation by sexual selection on male coloration. Expand
The effect of environmental and social factors on the courtship and mating dynamics of the smooth newt, Triturus v. vulgaris
TLDR
There is variance in male mating success but the relative contributions of environmental factors and phenotypic traits needs further clarification. Expand
The financial consequences of too many men: sex ratio effects on saving, borrowing, and spending.
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Examination of how sex ratio influences saving, borrowing, and spending in the United States shows that male-biased sex ratios lead men to discount the future and desire immediate rewards. Expand
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