University of Jyväskylä | JYX Digital Repository

  • English  | Give feedback |
    • suomi
    • English
 
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  • JYX
  • Artikkelit
  • Matemaattis-luonnontieteellinen tiedekunta
  • View Item
JYX > Artikkelit > Matemaattis-luonnontieteellinen tiedekunta > View Item

Not all sex ratios are equal : the Fisher condition, parental care and sexual selection

ThumbnailFinal Draft
View/Open
410.1Kb

Downloads:  
Show download detailsHide download details  
Jennions, M. D., & Fromhage, L. (2017). Not all sex ratios are equal : the Fisher condition, parental care and sexual selection. Philosophical Transactions of the Royal Society B: Biological Sciences, 372(1729), Article 20160312. https://doi.org/10.1098/rstb.2016.0312
Published in
Philosophical Transactions of the Royal Society B: Biological Sciences
Authors
Jennions, Michael D. |
Fromhage, Lutz
Date
2017
Discipline
Ekologia ja evoluutiobiologiaEcology and Evolutionary Biology
Copyright
© 2017 The Author(s) Published by the Royal Society. This is a final draft version of an article whose final and definitive form has been published by Royal Society. Published in this repository with the kind permission of the publisher.

 
The term ‘sex roles’ encapsulates male–female differences in mate searching, competitive traits that increase mating/fertilization opportunities, choosiness about mates and parental care. Theoretical models suggest that biased sex ratios drive the evolution of sex roles. To model sex role evolution, it is essential to note that in most sexually reproducing species (haplodiploid insects are an exception), each offspring has one father and one mother. Consequently, the total number of offspring produced by each sex is identical, so the mean number of offspring produced by individuals of each sex depends on the sex ratio (Fisher condition). Similarly, the total number of heterosexual matings is identical for each sex. On average, neither sex can mate nor breed more often when the sex ratio is even. But equally common in which sex ratio? The Fisher condition only applies to some reproductive measures (e.g. lifetime offspring production or matings) for certain sex ratios (e.g. operational or adult sex ratio; OSR, ASR). Here, we review recent models that clarify whether a biased OSR, ASR or sex ratio at maturation (MSR) have a causal or correlational relationship with the evolution of sex differences in parental care and competitive traits—two key components of sex roles. We suggest that it is more fruitful to understand the combined effect of the MSR and mortality rates while caring and competing than that of the ASR itself. In short, we argue that the ASR does not have a causal role in the evolution of parental care. We point out, however, that the ASR can be a cue for adaptive phenotypic plasticity in how each sex invests in parental care. This article is part of the themed issue ‘Adult sex ratios and reproductive decisions: a critical re-examination of sex differences in human and animal societies’. ...
Publisher
Royal Society
ISSN Search the Publication Forum
0962-8436
Keywords
sex ratios parental care Fisher condition sukupuolivalinta
DOI
https://doi.org/10.1098/rstb.2016.0312
URI

http://urn.fi/URN:NBN:fi:jyu-201801171236

Publication in research information system

https://converis.jyu.fi/converis/portal/detail/Publication/27140704

Metadata
Show full item record
Collections
  • Matemaattis-luonnontieteellinen tiedekunta [4434]

Related items

Showing items with similar title or keywords.

  • Coevolution of parental investment and sexually selected traits drives sex-role divergence 

    Fromhage, Lutz; Jennions, Michael D. (Nature Publishing Group, 2016)
    Sex-role evolution theory attempts to explain the origin and direction of male-female differences. A fundamental question is why anisogamy, the difference in gamete size that defines the sexes, has repeatedly led to large ...
  • Genetics of condition and sexual selection 

    Ketola, Tarmo (University of Jyväskylä, 2007)
    FM Tarmo Ketolan ekologian ja ympäristönhoidon väitöskirjan ”Genetics of Condition and Sexual Selection” (Kunnon ja seksuaalivalinnan genetiikka) tarkastustilaisuus Jyväskylän yliopistossa. Vastaväittäjänä professori Juha ...
  • Maintenance of genetic variation in sexual ornamentation : role of precopulatory and postcopulatory sexual selection 

    Kekäläinen, Jukka (University of Jyväskylä, 2010)
  • Implications of size‐selective fisheries on sexual selection 

    Uusi-Heikkilä, Silva (Wiley-Blackwell, 2020)
    Fisheries often combine high mortality with intensive size‐selectivity and can, thus, be expected to reduce body size and size variability in exploited populations. In many fish species, body size is a sexually selected ...
  • Condition-dependence of male sexual signalling in the drumming wolf spider Hygrolycosa rubrofasciata 

    Ahtiainen, Jari J. (Jyväskylän yliopisto, 2003)
    Jari Ahtiaisen väitöskirjatyön tutkimusten perusteella voidaan todeta, että H. rubrofasciata susihämähäkkinaaraat voivat käyttää koiraan seksuaalista kuntoa mittana arvioidessaan koiraan fenotyyppistä ja geneettistä laatua. ...
  • Browse materials
  • Browse materials
  • Articles
  • Conferences and seminars
  • Electronic books
  • Historical maps
  • Journals
  • Tunes and musical notes
  • Photographs
  • Presentations and posters
  • Publication series
  • Research reports
  • Research data
  • Study materials
  • Theses

Browse

All of JYXCollection listBy Issue DateAuthorsSubjectsPublished inDepartmentDiscipline

My Account

Login

Statistics

View Usage Statistics
  • How to publish in JYX?
  • Self-archiving
  • Publish Your Thesis Online
  • Publishing Your Dissertation
  • Publication services

Open Science at the JYU
 
Data Protection Description

Accessibility Statement

Unless otherwise specified, publicly available JYX metadata (excluding abstracts) may be freely reused under the CC0 waiver.
Open Science Centre