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Inbreeding alters intersexual fitness correlations in Drosophila simulans.

Duffy E, Joag R, Radwan J, Wedell N, Hosken DJ - Ecol Evol (2014)

Bottom Line: Intralocus sexual conflict results from sexually antagonistic selection on traits shared by the sexes.We measured male and female fitness at different times following the establishment of isofemale lines and found that the sign of the association between the two measures varied with time after initial inbreeding.Our results are consistent with suggestions that the type of genetic variation segregating within a population can determine the extent of intralocus sexual conflict and also support the idea that sexually antagonistic alleles segregate for longer in populations than alleles with sexually concordant effects.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Science, Jagiellonian University Gronostawa 7, Krakow, Poland.

ABSTRACT
Intralocus sexual conflict results from sexually antagonistic selection on traits shared by the sexes. This can displace males and females from their respective fitness optima, and negative intersexual correlations (r mf) for fitness are the unequivocal indicator of this evolutionary conflict. It has recently been suggested that intersexual fitness correlations can vary depending on the segregating genetic variation present in a population, and one way to alter genetic variation and test this idea is via inbreeding. Here, we test whether intersexual correlations for fitness vary with inbreeding in Drosophila simulans isolines reared under homogenous conditions. We measured male and female fitness at different times following the establishment of isofemale lines and found that the sign of the association between the two measures varied with time after initial inbreeding. Our results are consistent with suggestions that the type of genetic variation segregating within a population can determine the extent of intralocus sexual conflict and also support the idea that sexually antagonistic alleles segregate for longer in populations than alleles with sexually concordant effects.

No MeSH data available.


Related in: MedlinePlus

The intersexual fitness correlations at the three levels of inbreeding: (A) after 5 generations of inbreeding (short duration of inbreeding = I), (B) 9 generations of inbreeding (medium duration of inbreeding = II), and (C) 13 generations of inbreeding (long duration of inbreeding = III). For the short duration of inbreeding, (A) correlation of standardized line means revealed a positive male–female fitness association (df = 31, P = 0.039, r = 0.359. Linear regression F1, 31 = 4.6, P = 0.039, r2 = 0.101; B = 0.330, SE: 0.15). For the medium duration of inbreeding (intermediate inbreeding – B), correlation of standardized line means revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.145, r = −0.259. Linear regression F1, 31 = 2.2, P = 0.145, r2 = 0.037; B = −0.278, SE: 0.18). For the long duration of inbreeding (high inbreeding – C), correlation of standardized line means also revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.44, r = −0.140. Linear regression F1,31 = 0.62, P = 0.44, r2 = 0.012; B = −0.08, SE: 0.10). Blue lines around regression lines represent 95% confidence envelopes.
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fig01: The intersexual fitness correlations at the three levels of inbreeding: (A) after 5 generations of inbreeding (short duration of inbreeding = I), (B) 9 generations of inbreeding (medium duration of inbreeding = II), and (C) 13 generations of inbreeding (long duration of inbreeding = III). For the short duration of inbreeding, (A) correlation of standardized line means revealed a positive male–female fitness association (df = 31, P = 0.039, r = 0.359. Linear regression F1, 31 = 4.6, P = 0.039, r2 = 0.101; B = 0.330, SE: 0.15). For the medium duration of inbreeding (intermediate inbreeding – B), correlation of standardized line means revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.145, r = −0.259. Linear regression F1, 31 = 2.2, P = 0.145, r2 = 0.037; B = −0.278, SE: 0.18). For the long duration of inbreeding (high inbreeding – C), correlation of standardized line means also revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.44, r = −0.140. Linear regression F1,31 = 0.62, P = 0.44, r2 = 0.012; B = −0.08, SE: 0.10). Blue lines around regression lines represent 95% confidence envelopes.

Mentions: After the short period of inbreeding, rmf was significantly positive (df = 31, rmf = 0.3596, P = 0.039, Fig.1), and the association became negative, although not statistically significantly so, at later stages of inbreeding (medium inbreeding duration: df = 31, rmf = −0.259, P = 0.145; long inbreeding duration: df = 31, rmf = −0.140, P = 0.437, Fig.1). Although these latter associations are not significantly negative, they are still significantly lower than at the earlier stage, as we find correlation coefficients from the medium and long inbreeding stages tended to be significantly different from the short stage, our lowest level of inbreeding.


Inbreeding alters intersexual fitness correlations in Drosophila simulans.

Duffy E, Joag R, Radwan J, Wedell N, Hosken DJ - Ecol Evol (2014)

The intersexual fitness correlations at the three levels of inbreeding: (A) after 5 generations of inbreeding (short duration of inbreeding = I), (B) 9 generations of inbreeding (medium duration of inbreeding = II), and (C) 13 generations of inbreeding (long duration of inbreeding = III). For the short duration of inbreeding, (A) correlation of standardized line means revealed a positive male–female fitness association (df = 31, P = 0.039, r = 0.359. Linear regression F1, 31 = 4.6, P = 0.039, r2 = 0.101; B = 0.330, SE: 0.15). For the medium duration of inbreeding (intermediate inbreeding – B), correlation of standardized line means revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.145, r = −0.259. Linear regression F1, 31 = 2.2, P = 0.145, r2 = 0.037; B = −0.278, SE: 0.18). For the long duration of inbreeding (high inbreeding – C), correlation of standardized line means also revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.44, r = −0.140. Linear regression F1,31 = 0.62, P = 0.44, r2 = 0.012; B = −0.08, SE: 0.10). Blue lines around regression lines represent 95% confidence envelopes.
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Related In: Results  -  Collection

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fig01: The intersexual fitness correlations at the three levels of inbreeding: (A) after 5 generations of inbreeding (short duration of inbreeding = I), (B) 9 generations of inbreeding (medium duration of inbreeding = II), and (C) 13 generations of inbreeding (long duration of inbreeding = III). For the short duration of inbreeding, (A) correlation of standardized line means revealed a positive male–female fitness association (df = 31, P = 0.039, r = 0.359. Linear regression F1, 31 = 4.6, P = 0.039, r2 = 0.101; B = 0.330, SE: 0.15). For the medium duration of inbreeding (intermediate inbreeding – B), correlation of standardized line means revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.145, r = −0.259. Linear regression F1, 31 = 2.2, P = 0.145, r2 = 0.037; B = −0.278, SE: 0.18). For the long duration of inbreeding (high inbreeding – C), correlation of standardized line means also revealed a negative but nonsignificant male–female fitness association (df = 31, P = 0.44, r = −0.140. Linear regression F1,31 = 0.62, P = 0.44, r2 = 0.012; B = −0.08, SE: 0.10). Blue lines around regression lines represent 95% confidence envelopes.
Mentions: After the short period of inbreeding, rmf was significantly positive (df = 31, rmf = 0.3596, P = 0.039, Fig.1), and the association became negative, although not statistically significantly so, at later stages of inbreeding (medium inbreeding duration: df = 31, rmf = −0.259, P = 0.145; long inbreeding duration: df = 31, rmf = −0.140, P = 0.437, Fig.1). Although these latter associations are not significantly negative, they are still significantly lower than at the earlier stage, as we find correlation coefficients from the medium and long inbreeding stages tended to be significantly different from the short stage, our lowest level of inbreeding.

Bottom Line: Intralocus sexual conflict results from sexually antagonistic selection on traits shared by the sexes.We measured male and female fitness at different times following the establishment of isofemale lines and found that the sign of the association between the two measures varied with time after initial inbreeding.Our results are consistent with suggestions that the type of genetic variation segregating within a population can determine the extent of intralocus sexual conflict and also support the idea that sexually antagonistic alleles segregate for longer in populations than alleles with sexually concordant effects.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Science, Jagiellonian University Gronostawa 7, Krakow, Poland.

ABSTRACT
Intralocus sexual conflict results from sexually antagonistic selection on traits shared by the sexes. This can displace males and females from their respective fitness optima, and negative intersexual correlations (r mf) for fitness are the unequivocal indicator of this evolutionary conflict. It has recently been suggested that intersexual fitness correlations can vary depending on the segregating genetic variation present in a population, and one way to alter genetic variation and test this idea is via inbreeding. Here, we test whether intersexual correlations for fitness vary with inbreeding in Drosophila simulans isolines reared under homogenous conditions. We measured male and female fitness at different times following the establishment of isofemale lines and found that the sign of the association between the two measures varied with time after initial inbreeding. Our results are consistent with suggestions that the type of genetic variation segregating within a population can determine the extent of intralocus sexual conflict and also support the idea that sexually antagonistic alleles segregate for longer in populations than alleles with sexually concordant effects.

No MeSH data available.


Related in: MedlinePlus