Advanced

Clutch size evolution under sexual conflict enhances the stability of mating systems

Smith, Henrik LU and Härdling, Roger LU (2000) In Royal Society of London. Proceedings B. Biological Sciences 267(1458). p.2163-2170
Abstract
Models of optimal clutch size often implicitly assume a situation with uniparental care. However, the evolutionary conflict between males and females over the division of parental care will have a major influence on the evolution of clutch size. Since clutch size is a female trait, a male has little possibility of directly influencing it. However, the optimal clutch size from a female's perspective will depend on the amount of paternal care her mate is expected to provide. The sexual conflict over parental care well in its turn be affected by clutch size, since a larger clutch makes male care more valuable. Hence, there will be joint evolution of mating system and clutch size. In this paper, we demonstrate that this joint evolution will... (More)
Models of optimal clutch size often implicitly assume a situation with uniparental care. However, the evolutionary conflict between males and females over the division of parental care will have a major influence on the evolution of clutch size. Since clutch size is a female trait, a male has little possibility of directly influencing it. However, the optimal clutch size from a female's perspective will depend on the amount of paternal care her mate is expected to provide. The sexual conflict over parental care well in its turn be affected by clutch size, since a larger clutch makes male care more valuable. Hence, there will be joint evolution of mating system and clutch size. In this paper, we demonstrate that this joint evolution will tend to stabilize the mating system. In a situation with conventional sex roles, this joint evolution might result in either increased clutch size and biparental care or reduced clutch size and uniparental female care. Under some circumstances the initial conditions might determine which will be the outcome. These results demonstrate that it may be difficult to deduce whether biparental care evolved because of few opportunities for breeding males increasing their fitness by attracting additional mates or because of the importance of their care for offspring fitness by studying prevailing mating systems using, for example, male removals or manipulation of males' opportunities for fielding additional mates. In general terms, we demonstrate that models of life-history evolution have to consider the social contest in which they evolve. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Royal Society of London. Proceedings B. Biological Sciences
volume
267
issue
1458
pages
2163 - 2170
publisher
Royal Society
external identifiers
  • scopus:0034619351
ISSN
1471-2954
DOI
10.1098/rspb.2000.1264
language
English
LU publication?
yes
id
50597858-0262-48c3-94f5-3b29f5c410d3 (old id 147674)
date added to LUP
2007-06-26 12:16:03
date last changed
2017-04-16 03:25:05
@article{50597858-0262-48c3-94f5-3b29f5c410d3,
  abstract     = {Models of optimal clutch size often implicitly assume a situation with uniparental care. However, the evolutionary conflict between males and females over the division of parental care will have a major influence on the evolution of clutch size. Since clutch size is a female trait, a male has little possibility of directly influencing it. However, the optimal clutch size from a female's perspective will depend on the amount of paternal care her mate is expected to provide. The sexual conflict over parental care well in its turn be affected by clutch size, since a larger clutch makes male care more valuable. Hence, there will be joint evolution of mating system and clutch size. In this paper, we demonstrate that this joint evolution will tend to stabilize the mating system. In a situation with conventional sex roles, this joint evolution might result in either increased clutch size and biparental care or reduced clutch size and uniparental female care. Under some circumstances the initial conditions might determine which will be the outcome. These results demonstrate that it may be difficult to deduce whether biparental care evolved because of few opportunities for breeding males increasing their fitness by attracting additional mates or because of the importance of their care for offspring fitness by studying prevailing mating systems using, for example, male removals or manipulation of males' opportunities for fielding additional mates. In general terms, we demonstrate that models of life-history evolution have to consider the social contest in which they evolve.},
  author       = {Smith, Henrik and Härdling, Roger},
  issn         = {1471-2954},
  language     = {eng},
  number       = {1458},
  pages        = {2163--2170},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Clutch size evolution under sexual conflict enhances the stability of mating systems},
  url          = {http://dx.doi.org/10.1098/rspb.2000.1264},
  volume       = {267},
  year         = {2000},
}