scholarly journals Intralocus sexual conflict for fitness: sexually antagonistic alleles for testosterone

2011 ◽  
Vol 279 (1735) ◽  
pp. 1889-1895 ◽  
Author(s):  
Suzanne C. Mills ◽  
Esa Koskela ◽  
Tapio Mappes
Keyword(s):  
Negative Correlation ◽  
Sexual Conflict ◽  
Bank Vole ◽  
Genetic Locus ◽  
Myodes Glareolus ◽  
Phenotypic Traits ◽  
Intralocus Sexual Conflict ◽  
Opposite Sex ◽  
Sexually Antagonistic Selection ◽  
Males And Females

Intralocus sexual conflict occurs when a trait encoded by the same genetic locus in the two sexes has different optima in males and females. Such conflict is widespread across taxa, however, the shared phenotypic traits that mediate the conflict are largely unknown. We examined whether the sex hormone, testosterone (T), that controls sexual differentiation, contributes to sexually antagonistic fitness variation in the bank vole, Myodes glareolus . We compared (opposite-sex) sibling reproductive fitness in the bank vole after creating divergent selection lines for T. This study shows that selection for T was differentially associated with son versus daughter reproductive success, causing a negative correlation in fitness between full siblings. Our results demonstrate the presence of intralocus sexual conflict for fitness in this small mammal and that sexually antagonistic selection is acting on T. We also found a negative correlation in fitness between parents and their opposite-sex progeny (e.g. father–daughter), highlighting a dilemma for females, as the indirect genetic benefits of selecting reproductively successful males (high T) are lost with daughters. We discuss mechanisms that may mitigate this disparity between progeny quality.

scholarly journals Constraints on the coevolution of contemporary human males and females

2012 ◽  
Vol 279 (1748) ◽  
pp. 4836-4844 ◽  
Author(s):  
Stephen C. Stearns ◽  
Diddahally R. Govindaraju ◽  
Douglas Ewbank ◽  
Sean G. Byars
Keyword(s):  
Sexual Conflict ◽  
Age At First Birth ◽  
Male And Female ◽  
Selection Gradients ◽  
Intralocus Sexual Conflict ◽  
Individual Traits ◽  
Sexually Antagonistic Selection ◽  
Males And Females ◽  
Female Responses ◽  
Genetic Covariances

Because autosomal genes in sexually reproducing organisms spend on average half their time in each sex, and because the traits that they influence encounter different selection pressures in males and females, the evolutionary responses of one sex are constrained by processes occurring in the other sex. Although intralocus sexual conflict can restrict sexes from reaching their phenotypic optima, no direct evidence currently supports its operation in humans. Here, we show that the pattern of multivariate selection acting on human height, weight, blood pressure and glucose, total cholesterol, and age at first birth differs significantly between males and females, and that the angles between male and female linear (77.8 ± 20.5°) and nonlinear (99.1 ± 25.9°) selection gradients were closer to orthogonal than zero, confirming the presence of sexually antagonistic selection. We also found evidence for intralocus sexual conflict demonstrated by significant changes in the predicted male and female responses to selection of individual traits when cross-sex genetic covariances were included and a significant reduction in the angle between male- and female-predicted responses when cross-sex covariances were included (16.9 ± 15.7°), compared with when they were excluded (87.9 ± 31.6°). We conclude that intralocus sexual conflict constrains the joint evolutionary responses of the two sexes in a contemporary human population.

Draw-a-Person Protocols of Male and Female College Students

1967 ◽  
Vol 25 (3) ◽  
pp. 873-879 ◽  
Author(s):  
Christina Soccolich ◽  
Boleslaw A. Wysocki
Keyword(s):  
College Students ◽  
Sexual Conflict ◽  
Female College Students ◽  
Strong Tendency ◽  
Male And Female ◽  
Female College ◽  
Opposite Sex ◽  
Males And Females

A purely male vs female differentiation of D-A-P test variables was attempted for 50 male and 50 female college students or graduates of 3 yr. or less. Analysis of sex and aggression variables revealed much emphasis and conflict in these areas in the drawings of both males and females. Sexual conflict was almost always expressed in the drawings of the opposite sex alone. A generalized psychosexual immaturity was demonstrated in the drawings of male Ss. Female Ss seemed to exhibit conflict over masculine orientation and ‘role’ inversion in their drawings. In addition, a strong tendency toward ‘evasion,’ a wish to ‘not see’ or ‘perceive vaguely,’ was heavily evidenced in the drawings of both male and, to a lesser extent, female Ss.

6. Sexual conflict

2018 ◽  
pp. 88-103
Author(s):  
Leigh W. Simmons
Keyword(s):  
Sexual Selection ◽  
Sexual Conflict ◽  
Arms Race ◽  
Arms Races ◽  
Antagonistic Selection ◽  
Before And After ◽  
Sexually Antagonistic Selection ◽  
Males And Females ◽  
Evolutionary Consequences

The reproductive interests of males and females will almost always differ, for example over whether to mate and how often, when to produce offspring and how many, or how much to invest in each offspring. Whenever the reproductive interests of males and females differ, opposing selection on males and females to achieve their preferred outcome will generate sexually antagonistic selection. Such sexual conflict is reflected in differences in the appearance and behaviour of the sexes as each evolves to gain the advantage in a fitness ‘arms race’. ‘Sexual conflict’ explores the evolutionary consequences of these arms races in the context of sexual selection as it occurs both before and after mating.

scholarly journals Sex-dependent dominance at a single locus maintains variation in age at maturity in Atlantic salmon

2015 ◽  
Author(s):  
Nicola J Barson ◽  
Tutku Aykanat ◽  
Kjetil Hindar ◽  
Matthew Baranski ◽  
Geir H Bolstad ◽  
...  
Keyword(s):  
Sexual Conflict ◽  
Balancing Selection ◽  
Age At Maturity ◽  
Sexual Antagonism ◽  
Substantial Impact ◽  
Intralocus Sexual Conflict ◽  
Snp Data ◽  
Fitness Trait ◽  
Males And Females ◽  
Spatially Varying Selection

Males and females share many traits that have a common genetic basis, however selection on these traits often differs between the sexes leading to sexual conflict. Under such sexual antagonism, theory predicts the evolution of genetic architectures that resolve this sexual conflict. Yet, despite intense theoretical and empirical interest, the specific genetic loci behind sexually antagonistic phenotypes have rarely been identified, limiting our understanding of how sexual conflict impacts genome evolution and the maintenance of genetic diversity. Here, we identify a large effect locus controlling age at maturity in 57 salmon populations, an important fitness trait in which selection favours earlier maturation in males than females, and show it is a clear example of sex dependent dominance reducing intralocus sexual conflict and maintaining adaptive variation in wild populations. Using high density SNP data and whole genome re-sequencing, we found that vestigial-like family member 3 (VGLL3) exhibits sex-dependent dominance in salmon, promoting earlier and later maturation in males and females, respectively. VGLL3, an adiposity regulator associated with size and age at maturity in humans, explained 39.4% of phenotypic variation, an unexpectedly high effect size for what is usually considered a highly polygenic trait. Such large effects are predicted under balancing selection from either sexually antagonistic or spatially varying selection. Our results provide the first empirical example of dominance reversal permitting greater optimisation of phenotypes within each sex, contributing to the resolution of sexual conflict in a major and widespread evolutionary trade-off between age and size at maturity. They also provide key empirical evidence for how variation in reproductive strategies can be maintained over large geographical scales. We further anticipate these findings will have a substantial impact on population management in a range of harvested species where trends towards earlier maturation have been observed

Sexual Conflict in Human Mating

2017 ◽  
Vol 26 (4) ◽  
pp. 307-313 ◽  
Author(s):  
David M. Buss
Keyword(s):  
Sexual Conflict ◽  
Sexual Exploitation ◽  
Group Living ◽  
Sexual Infidelity ◽  
Sexual Regret ◽  
Opposite Sex ◽  
Living Species ◽  
Males And Females ◽  
Human Mating ◽  
Sexually Antagonistic Coevolution

Despite interdependent reproductive fates that favor cooperation, males and females exhibit many psychological and behavioral footprints of sexually antagonistic coevolution. These include strategies of deception, sexual exploitation, and sexual infidelity as well as anti-exploitation defenses such as commitment skepticism and emotions such as sexual regret and jealousy. Sexual conflict pervades the mating arena prior to sexual consummation, after a mating relationship has formed, and in the aftermath of a breakup. It also permeates many other social relationships in forms such as daughter-guarding, conflict in opposite-sex friendships, and workplace sexual harassment. As such, sexual conflict constitutes not a narrow or occasional flashpoint but rather persistent threads that run through our intensely group-living species.

Reproductive behavior

2018 ◽  
Author(s):  
Rachel Olzer ◽  
Rebecca L. Ehrlich ◽  
Justa L. Heinen-Kay ◽  
Jessie Tanner ◽  
Marlene Zuk
Keyword(s):  
Sexual Selection ◽  
Sexual Conflict ◽  
Female Choice ◽  
Reproductive Behavior ◽  
Mating Systems ◽  
Insect Behavior ◽  
Sequential Approach ◽  
Evolutionary Mechanisms ◽  
Anatomy And Physiology ◽  
Males And Females

Sex and reproduction lie at the heart of studies of insect behavior. We begin by providing a brief overview of insect anatomy and physiology, followed by an introduction to the overarching themes of parental investment, sexual selection, and mating systems. We then take a sequential approach to illustrate the diversity of phenomena and concepts behind insect reproductive behavior from pre-copulatory mate signalling through copulatory sperm transfer, mating positions, and sexual conflict, to post-copulatory sperm competition, and cryptic female choice. We provide an overview of the evolutionary mechanisms driving reproductive behavior. These events are linked by the economic defendability of mates or resources, and how these are allocated in each sex. Under the framework of economic defendability, the reader can better understand how sexual antagonistic behaviors arise as the result of competing optimal fitness strategies between males and females.

A large panel of novel microsatellite markers for the bank vole (Myodes glareolus)

2008 ◽  
Vol 8 (5) ◽  
pp. 1164-1168 ◽  
Author(s):  
K. RIKALAINEN ◽  
A. GRAPPUTO ◽  
E. KNOTT ◽  
E. KOSKELA ◽  
T. MAPPES
Keyword(s):  
Microsatellite Markers ◽  
Bank Vole ◽  
Myodes Glareolus ◽  
Large Panel ◽  
Bank Vole Myodes Glareolus

scholarly journals Rodent host population dynamics drive zoonotic Lyme Borreliosis and Orthohantavirus infections in humans in Northern Europe

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahdi Aminikhah ◽  
Jukka T. Forsman ◽  
Esa Koskela ◽  
Tapio Mappes ◽  
Jussi Sane ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Lyme Borreliosis ◽  
Bank Vole ◽  
Myodes Glareolus ◽  
Northern Europe ◽  
Time Lags ◽  
Rodent Population ◽  
Vole Cycles ◽  
Infection Dynamics ◽  
Abundance Fluctuations

AbstractZoonotic diseases, caused by pathogens transmitted between other vertebrate animals and humans, pose a major risk to human health. Rodents are important reservoir hosts for many zoonotic pathogens, and rodent population dynamics affect the infection dynamics of rodent-borne diseases, such as diseases caused by hantaviruses. However, the role of rodent population dynamics in determining the infection dynamics of rodent-associated tick-borne diseases, such as Lyme borreliosis (LB), caused by Borrelia burgdorferi sensu lato bacteria, have gained limited attention in Northern Europe, despite the multiannual abundance fluctuations, the so-called vole cycles, that characterise rodent population dynamics in the region. Here, we quantify the associations between rodent abundance and LB human cases and Puumala Orthohantavirus (PUUV) infections by using two time series (25-year and 9-year) in Finland. Both bank vole (Myodes glareolus) abundance as well as LB and PUUV infection incidence in humans showed approximately 3-year cycles. Without vector transmitted PUUV infections followed the bank vole host abundance fluctuations with two-month time lag, whereas tick-transmitted LB was associated with bank vole abundance ca. 12 and 24 months earlier. However, the strength of association between LB incidence and bank vole abundance ca. 12 months before varied over the study years. This study highlights that the human risk to acquire rodent-borne pathogens, as well as rodent-associated tick-borne pathogens is associated with the vole cycles in Northern Fennoscandia, yet with complex time lags.

Sign in / Sign up

Export Citation Format

Share Document