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Sex-specific sibling interactions and offspring fitness in vertebrates: patterns and implications for maternal sex ratios

Uller, Tobias LU (2006) In Biological Reviews 81(2). p.207-217
Abstract
Vertebrate sex ratios are notorious for their lack of fit to theoretical models, both with respect to the direction and the magnitude of the sex ratio adjustment. The reasons for this are likely to be linked to simpilfying assumptions regarding vertebrate life histories. More specifically, if the sex ratio adjustment itself influences offspring fitness, due to sex-specific interactions among offspring, this could affect optimal sex ratios. A review of the literature suggests that sex-specific sibling interactions in vertebrates result from three major causes: (i) sex asymmetries in competitive ability, for example due to sexual dimorphism, (ii) sex-specific cooperation or helping, and (iii) sex asymmetries in non-competitive interactions,... (More)
Vertebrate sex ratios are notorious for their lack of fit to theoretical models, both with respect to the direction and the magnitude of the sex ratio adjustment. The reasons for this are likely to be linked to simpilfying assumptions regarding vertebrate life histories. More specifically, if the sex ratio adjustment itself influences offspring fitness, due to sex-specific interactions among offspring, this could affect optimal sex ratios. A review of the literature suggests that sex-specific sibling interactions in vertebrates result from three major causes: (i) sex asymmetries in competitive ability, for example due to sexual dimorphism, (ii) sex-specific cooperation or helping, and (iii) sex asymmetries in non-competitive interactions, for example steroid leakage between fetuses. Incorporating sex-specific sibling interactions into a sex ratio model shows that the), will affect maternal sex ratio strategies and, under some conditions, can repress other selection pressures for sex ratio adjustment. Furthermore, sex-specific interactions could also explain patterns of within-brood sex ratio (e.g. in relation to laying order). Failure to take sex-specific sibling interactions into account could partly explain the lack of sex ratio adjustment in accordance with theoretical expectations in vertebrates, and differences among taxa in sex-specific sibling interactions generate predictions for comparative and experimental studies. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Biological Reviews
volume
81
issue
2
pages
207 - 217
publisher
Cambridge University Press
external identifiers
  • Scopus:33746191959
ISSN
1469-185X
DOI
10.1017/S1464793105006962
language
English
LU publication?
no
id
462ebf39-cf6f-44de-8c9f-7d43129d2b12 (old id 4731485)
date added to LUP
2014-11-07 09:46:24
date last changed
2016-12-04 04:44:27
@misc{462ebf39-cf6f-44de-8c9f-7d43129d2b12,
  abstract     = {Vertebrate sex ratios are notorious for their lack of fit to theoretical models, both with respect to the direction and the magnitude of the sex ratio adjustment. The reasons for this are likely to be linked to simpilfying assumptions regarding vertebrate life histories. More specifically, if the sex ratio adjustment itself influences offspring fitness, due to sex-specific interactions among offspring, this could affect optimal sex ratios. A review of the literature suggests that sex-specific sibling interactions in vertebrates result from three major causes: (i) sex asymmetries in competitive ability, for example due to sexual dimorphism, (ii) sex-specific cooperation or helping, and (iii) sex asymmetries in non-competitive interactions, for example steroid leakage between fetuses. Incorporating sex-specific sibling interactions into a sex ratio model shows that the), will affect maternal sex ratio strategies and, under some conditions, can repress other selection pressures for sex ratio adjustment. Furthermore, sex-specific interactions could also explain patterns of within-brood sex ratio (e.g. in relation to laying order). Failure to take sex-specific sibling interactions into account could partly explain the lack of sex ratio adjustment in accordance with theoretical expectations in vertebrates, and differences among taxa in sex-specific sibling interactions generate predictions for comparative and experimental studies.},
  author       = {Uller, Tobias},
  issn         = {1469-185X},
  language     = {eng},
  number       = {2},
  pages        = {207--217},
  publisher    = {ARRAY(0x922df98)},
  series       = {Biological Reviews},
  title        = {Sex-specific sibling interactions and offspring fitness in vertebrates: patterns and implications for maternal sex ratios},
  url          = {http://dx.doi.org/10.1017/S1464793105006962},
  volume       = {81},
  year         = {2006},
}