The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Joseph L Tomkins - One of the best experts on this subject based on the ideXlab platform.
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On the resolution of the Lek paradox
Trends in Ecology and Evolution, 2008Co-Authors: Janne S. Kotiaho, Natasha R. Lebas, Mikael Puurtinen, Joseph L TomkinsAbstract:Directional female mate choice is expected to deplete additive genetic variation in male traits. This should preclude such trait-based choice from resulting in genetic benefits to offspring, and yet genetic benefits are the explanation for the choice. This evolutionary conundrum is known as the Lek paradox. Newly proposed resolutions to this paradox aim to unravel mechanisms that contribute to the persistence of genetic variance in traits under directional female mate choice. © 2007 Elsevier Ltd. All rights reserved.
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on the resolution of the Lek paradox
Trends in Ecology and Evolution, 2008Co-Authors: Janne S. Kotiaho, Natasha R. Lebas, Mikael Puurtinen, Joseph L TomkinsAbstract:Directional female mate choice is expected to deplete additive genetic variation in male traits. This should preclude such trait-based choice from resulting in genetic benefits to offspring, and yet genetic benefits are the explanation for the choice. This evolutionary conundrum is known as the Lek paradox. Newly proposed resolutions to this paradox aim to unravel mechanisms that contribute to the persistence of genetic variance in traits under directional female mate choice.
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Genic capture and resolving the Lek paradox
Trends in Ecology and Evolution, 2004Co-Authors: Joseph L Tomkins, Jacek Radwan, Janne S. Kotiaho, Tom TregenzaAbstract:The genic capture hypothesis offers a resolution to the question of how genetic variation in male sexually selected traits is maintained in the face of strong female preferences. The hypothesis is that male display traits are costly to produce and hence depend upon overall condition, which itself is dependent upon genes at many loci. Few attempts have been made to test the assumptions and predictions of the genic capture hypothesis rigorously and, in particular, little attention has been paid to determining the genetic basis of condition. Such tests are crucial to our understanding of the maintenance of genetic variation and in the evaluation of recent models that propose a role for sexual selection in the maintenance of sex. Here, we review approaches to testing the link between genetically determined condition and levels of sexual trait expression and consider the probable importance of deleterious mutations.
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Towards a resolution of the Lek paradox
Nature, 2001Co-Authors: Janne S. Kotiaho, L W Simmons, Joseph L TomkinsAbstract:Genetic benefits in the shape of 'good genes' have been invoked to explain costly female choice in the absence of direct fitness benefits. Little genetic variance in fitness traits is expected, however, because directional selection tends to drive beneficial alleles to fixation. There seems to be little potential, therefore, for female choice to result in genetic benefits, giving rise to the 'Lek paradox'. Nevertheless, evidence shows that genetic variance persists despite directional selection and genetic benefits of female choice are frequently reported. A theoretical solution to the Lek paradox has been proposed on the basis of two assumptions: that traits are condition-dependent, and that condition shows high genetic variance. The observed genetic variability in sexual traits will be accounted for, because a proportion of the genetic variance in condition will be captured and expressed in the trait. Here we report results from experiments showing that male courtship rate in the dung beetle Onthophagus taurus is a condition-dependent trait that is preferred by females. More importantly, male condition has high genetic variance and is genetically correlated with courtship rate. Our results thereby represent a significant step towards a resolution of the Lek paradox.
Janne S. Kotiaho - One of the best experts on this subject based on the ideXlab platform.
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On the resolution of the Lek paradox
Trends in Ecology and Evolution, 2008Co-Authors: Janne S. Kotiaho, Natasha R. Lebas, Mikael Puurtinen, Joseph L TomkinsAbstract:Directional female mate choice is expected to deplete additive genetic variation in male traits. This should preclude such trait-based choice from resulting in genetic benefits to offspring, and yet genetic benefits are the explanation for the choice. This evolutionary conundrum is known as the Lek paradox. Newly proposed resolutions to this paradox aim to unravel mechanisms that contribute to the persistence of genetic variance in traits under directional female mate choice. © 2007 Elsevier Ltd. All rights reserved.
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on the resolution of the Lek paradox
Trends in Ecology and Evolution, 2008Co-Authors: Janne S. Kotiaho, Natasha R. Lebas, Mikael Puurtinen, Joseph L TomkinsAbstract:Directional female mate choice is expected to deplete additive genetic variation in male traits. This should preclude such trait-based choice from resulting in genetic benefits to offspring, and yet genetic benefits are the explanation for the choice. This evolutionary conundrum is known as the Lek paradox. Newly proposed resolutions to this paradox aim to unravel mechanisms that contribute to the persistence of genetic variance in traits under directional female mate choice.
-
Genic capture and resolving the Lek paradox
Trends in Ecology and Evolution, 2004Co-Authors: Joseph L Tomkins, Jacek Radwan, Janne S. Kotiaho, Tom TregenzaAbstract:The genic capture hypothesis offers a resolution to the question of how genetic variation in male sexually selected traits is maintained in the face of strong female preferences. The hypothesis is that male display traits are costly to produce and hence depend upon overall condition, which itself is dependent upon genes at many loci. Few attempts have been made to test the assumptions and predictions of the genic capture hypothesis rigorously and, in particular, little attention has been paid to determining the genetic basis of condition. Such tests are crucial to our understanding of the maintenance of genetic variation and in the evaluation of recent models that propose a role for sexual selection in the maintenance of sex. Here, we review approaches to testing the link between genetically determined condition and levels of sexual trait expression and consider the probable importance of deleterious mutations.
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Towards a resolution of the Lek paradox
Nature, 2001Co-Authors: Janne S. Kotiaho, L W Simmons, Joseph L TomkinsAbstract:Genetic benefits in the shape of 'good genes' have been invoked to explain costly female choice in the absence of direct fitness benefits. Little genetic variance in fitness traits is expected, however, because directional selection tends to drive beneficial alleles to fixation. There seems to be little potential, therefore, for female choice to result in genetic benefits, giving rise to the 'Lek paradox'. Nevertheless, evidence shows that genetic variance persists despite directional selection and genetic benefits of female choice are frequently reported. A theoretical solution to the Lek paradox has been proposed on the basis of two assumptions: that traits are condition-dependent, and that condition shows high genetic variance. The observed genetic variability in sexual traits will be accounted for, because a proportion of the genetic variance in condition will be captured and expressed in the trait. Here we report results from experiments showing that male courtship rate in the dung beetle Onthophagus taurus is a condition-dependent trait that is preferred by females. More importantly, male condition has high genetic variance and is genetically correlated with courtship rate. Our results thereby represent a significant step towards a resolution of the Lek paradox.
Tom Tregenza - One of the best experts on this subject based on the ideXlab platform.
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Genic capture and resolving the Lek paradox
Trends in Ecology and Evolution, 2004Co-Authors: Joseph L Tomkins, Jacek Radwan, Janne S. Kotiaho, Tom TregenzaAbstract:The genic capture hypothesis offers a resolution to the question of how genetic variation in male sexually selected traits is maintained in the face of strong female preferences. The hypothesis is that male display traits are costly to produce and hence depend upon overall condition, which itself is dependent upon genes at many loci. Few attempts have been made to test the assumptions and predictions of the genic capture hypothesis rigorously and, in particular, little attention has been paid to determining the genetic basis of condition. Such tests are crucial to our understanding of the maintenance of genetic variation and in the evaluation of recent models that propose a role for sexual selection in the maintenance of sex. Here, we review approaches to testing the link between genetically determined condition and levels of sexual trait expression and consider the probable importance of deleterious mutations.
Melvin M Bonilla - One of the best experts on this subject based on the ideXlab platform.
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an epigenetic resolution of the Lek paradox
BioEssays, 2016Co-Authors: Melvin M BonillaAbstract:: Female choice for traits signaling male genetic quality is expected to erode heritable variation in fitness, undermining the benefits of choice. Known as the Lek paradox, this contradiction has motivated extensive population genetic theory, yet remains unresolved. Recent modeling by Bonduriansky and Day concludes that costly female preference is best maintained when male condition is determined by environmentally induced factors transmitted across single generations. Here, we reformulate their model in explicitly epigenetic terms, and review evidence that environmentally induced paternal effects are mediated through epigenetic changes in sperm. Noncoding RNA expression, DNA methylation and histone modifications are highly sensitive to diet, stress, toxicants and stochastic events. Epigenetic variation renews each generation and cannot be exhausted by selection. By choosing well-endowed males that produce gametes in epigenetically good states, females can increase their fitness directly through increased fertilization success or indirectly through epigenetic effects on the fitness of offspring and potentially subsequent generations. Also watch the video abstract.
James S Sedinger - One of the best experts on this subject based on the ideXlab platform.
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Lek fidelity and movement among Leks by male greater sage grouse centrocercus urophasianus a capture mark recapture approach
Ibis, 2014Co-Authors: Daniel Gibson, Erik J Blomberg, Michael T Atamian, James S SedingerAbstract:Males in Lek mating systems tend to exhibit high fidelity to breeding Leks despite substantial evidence of skewed mating success among males. Although movements between Leks are often reported to be rare, such movements provide a mechanism for an individual to improve lifetime fitness in response to heterogeneity in reproductive conditions. Additionally, estimates of apparent movements among Leks are potentially biased due to unaccounted variation in detection probability across time and space. We monitored breeding male Greater Sage-grouse Centrocercus urophasianus on 13 Leks in eastern Nevada over a 10-year period, and estimated movement rates among Leks using capture-mark-recapture methods. We expected that male movement rates among Leks would be low, despite predictions of low breeding success for most males, and that detection rates would be highly variable among Leks and years. We used a robust design multistate analysis in Program mark to estimate probability of movements among Leks, while accounting for imperfect detection of males. Male Sage-grouse were extremely faithful to their Leks; the annual probability of a male moving away from its original Lek of capture was approximately 3% (se = 0.01). Detection probabilities varied substantially among Leks (range = 0.21–0.95), and among years (range = 0.30–0.76), but remained relatively constant within years at each Lek. These results suggest that male Sage-grouse dispersal is either rare, or consists primarily of dispersal of sub-adults from their natal areas prior to the breeding season. The study highlights the benefits of robust design multistate models over standard ‘live-encounter’ analyses, as they not only permit estimation of additional parameters, such as movement rates, but also allow for more precise parameter estimates that are less sensitive to heterogeneity in detection rates. Additionally, as these data were collected using capture-mark-recapture methods, our approach to estimating movement rates would be beneficial in systems where radiotagging is detrimental to the study organism.