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No intra-locus sexual conflict over reproductive fitness or ageing in field crickets.

Zajitschek F, Hunt J, Zajitschek SR, Jennions MD, Brooks R - PLoS ONE (2007)

Bottom Line: Differences in the ways in which males and females maximize evolutionary fitness can lead to intra-locus sexual conflict in which genes delivering fitness benefits to one sex are costly when expressed in the other.Using a half-sib breeding design, we show that the most important components of male and female reproductive effort (male calling effort and the number of eggs laid by females) were positively genetically correlated, especially in early adulthood.However, the genetic relationships between longevity and reproductive effort were different for males and females, leading to low genetic covariation between male and female longevity.

View Article: PubMed Central - PubMed

Affiliation: School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, Australia. felix.zajitschek@student.unsw.edu.au

ABSTRACT
Differences in the ways in which males and females maximize evolutionary fitness can lead to intra-locus sexual conflict in which genes delivering fitness benefits to one sex are costly when expressed in the other. Trade-offs between current reproductive effort and future reproduction and survival are fundamental to the evolutionary biology of ageing. This leads to the prediction that sex differences in the optimization of age-dependent reproductive effort may generate intra-locus sexual conflict over ageing rates. Here we test for intra-locus sexual conflict over age-dependent reproductive effort and longevity in the black field cricket, Teleogryllus commodus. Using a half-sib breeding design, we show that the most important components of male and female reproductive effort (male calling effort and the number of eggs laid by females) were positively genetically correlated, especially in early adulthood. However, the genetic relationships between longevity and reproductive effort were different for males and females, leading to low genetic covariation between male and female longevity. The apparent absence of intra-locus sexual conflict over ageing suggests that male and female longevity can evolve largely independently of one another.

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Related in: MedlinePlus

Inter-sexual genetic correlations between (a) male mean calling effort and female mean fecundity and (b) male and female longevity.
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pone-0000155-g001: Inter-sexual genetic correlations between (a) male mean calling effort and female mean fecundity and (b) male and female longevity.

Mentions: Male mean calling effort and female mean fecundity showed a strong positive genetic correlation (Fig 1a and Table 1, rA = 0.64±0.26 s.e.). When we assess total calling effort and fecundity the positive genetic correlation is even stronger (Table 1, rA = 0.93±0.24 s.e.). However, sex differences in the trade-off between reproductive effort and longevity resulted in a comparatively low genetic correlation between male and female longevity (Fig 1b and Table 1, rA = 0.29±0.39 s.e.).


No intra-locus sexual conflict over reproductive fitness or ageing in field crickets.

Zajitschek F, Hunt J, Zajitschek SR, Jennions MD, Brooks R - PLoS ONE (2007)

Inter-sexual genetic correlations between (a) male mean calling effort and female mean fecundity and (b) male and female longevity.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC1764717&req=5

pone-0000155-g001: Inter-sexual genetic correlations between (a) male mean calling effort and female mean fecundity and (b) male and female longevity.
Mentions: Male mean calling effort and female mean fecundity showed a strong positive genetic correlation (Fig 1a and Table 1, rA = 0.64±0.26 s.e.). When we assess total calling effort and fecundity the positive genetic correlation is even stronger (Table 1, rA = 0.93±0.24 s.e.). However, sex differences in the trade-off between reproductive effort and longevity resulted in a comparatively low genetic correlation between male and female longevity (Fig 1b and Table 1, rA = 0.29±0.39 s.e.).

Bottom Line: Differences in the ways in which males and females maximize evolutionary fitness can lead to intra-locus sexual conflict in which genes delivering fitness benefits to one sex are costly when expressed in the other.Using a half-sib breeding design, we show that the most important components of male and female reproductive effort (male calling effort and the number of eggs laid by females) were positively genetically correlated, especially in early adulthood.However, the genetic relationships between longevity and reproductive effort were different for males and females, leading to low genetic covariation between male and female longevity.

View Article: PubMed Central - PubMed

Affiliation: School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, Australia. felix.zajitschek@student.unsw.edu.au

ABSTRACT
Differences in the ways in which males and females maximize evolutionary fitness can lead to intra-locus sexual conflict in which genes delivering fitness benefits to one sex are costly when expressed in the other. Trade-offs between current reproductive effort and future reproduction and survival are fundamental to the evolutionary biology of ageing. This leads to the prediction that sex differences in the optimization of age-dependent reproductive effort may generate intra-locus sexual conflict over ageing rates. Here we test for intra-locus sexual conflict over age-dependent reproductive effort and longevity in the black field cricket, Teleogryllus commodus. Using a half-sib breeding design, we show that the most important components of male and female reproductive effort (male calling effort and the number of eggs laid by females) were positively genetically correlated, especially in early adulthood. However, the genetic relationships between longevity and reproductive effort were different for males and females, leading to low genetic covariation between male and female longevity. The apparent absence of intra-locus sexual conflict over ageing suggests that male and female longevity can evolve largely independently of one another.

Show MeSH
Related in: MedlinePlus