"I am not a Robot, I am Asexual": A Qualitative Critique of Allonormative Discourses of Ace and Aro Folks as Robots, Aliens, Monsters

Despite exploring other queer topics, communication scholars and rhetoricians are lacking in offering academic inquiries involving asexuality. We engaged in a critical thematic analysis of posts and comments posted from asexual and/or aromantic folks on the online communities of Reddit and AVEN, the Asexuality Visibility & Education Network. The analysis focused on three cultural tropes prominently used when describing asexual and aromantic folks, namely robots, aliens, and monsters. Our discussion centers asexual and aromantic voices and invites communication and rhetorical scholars to take steps in combating the allonormativity of our fields by centering the voices and experiences of intersectional aces and/or aros in their own research. We conclude with a call for an asexual and aromantic communication studies.

The Nuances of Intimacy: Asexual Perspectives and Experiences with Dating and Relationships

Asexuality studies are an emerging field in North America and Europe which lack large-scale, qualitative studies. Much existing research focuses on defining and categorizing asexuality, with researchers calling for more focus on the romantic and sexual relationships of asexual people. Drawing from an online survey with 349 participants, this paper describes the perceptions and experiences that asexual people have with dating and relationships. Participants answered 16 open-ended and 9 close-ended questions. After rounds of coding, three themes were selected for examination. These were dating, romantic and/or sexual relationships, and platonic relationships. These results showcase the challenges asexuals face with dating while also demonstrating how asexual people actively dismantle understandings of romantic, sexual, and platonic relationships through their own experiences and perspectives. Overall, this study provides greater legitimacy to the fluidity of asexuality and asexual relationships.

Deepening Sexual Desire and Erotic Fantasies Research in the ACE Spectrum: Comparing the Experiences of Asexual, Demisexual, Gray-Asexual, and Questioning People

Over the past 30 years, an increasing number of people have identified within the asexual (ACE) spectrum recognizing an absence/low/situational sexual attraction to individuals of any gender. The current study aims to deepen the knowledge of sexual desire, erotic fantasies, and related emotions within the ACE spectrum. A total of 1072 Italian volunteers were recruited to take part to the present study via social media. Data were collected from October 2021 to January 2022 using the Sexual Desire and Erotic Fantasies questionnaire and the Sexual Desire Inventory-2. Participants were divided into four groups: asexual, demisexual, gray-asexual, and questioning. Focusing on sexual desire, asexual people reported significantly lower scores than the other groups in all the dimensions except for "negative feelings to sexual desire," while demisexual participants showed the higher scores in all the domains except for "negative feelings to sexual desire." The questioning group reported the highest scores in the "negative feelings toward sexual desire" compared to the asexual and demisexual ones. The asexual group reported significantly lower scores than the other groups in fantasies frequency, fantasies importance, negative emotions, and sharing and experiencing. The demisexual group showed higher frequency of romantic fantasies than the asexual and gray-asexual ones. The results showed some specific patterns of desire and fantasies among the asexual, gray-asexual, demisexual, and questioning groups. These data may provide relevant material to clinicians working with asexual patients who need greater awareness about the diversity and heterogeneity of the sexual experience within the ACE spectrum.

Transcriptomic basis of sex loss in the pea aphid

BACKGROUND

Transitions from sexual to asexual reproduction are common in eukaryotes, but the underlying mechanisms remain poorly known. The pea aphid-Acyrthosiphon pisum-exhibits reproductive polymorphism, with cyclical parthenogenetic and obligate parthenogenetic lineages, offering an opportunity to decipher the genetic basis of sex loss. Previous work on this species identified a single 840 kb region controlling reproductive polymorphism and carrying 32 genes. With the aim of identifying the gene(s) responsible for sex loss and the resulting consequences on the genetic programs controlling sexual or asexual embryogenesis, we compared the transcriptomic response to photoperiod shortening-the main sex-inducing cue-of a sexual and an obligate asexual lineage of the pea aphid, focusing on heads (where the photoperiodic cue is detected) and embryos (the final target of the cue).

RESULTS

Our analyses revealed that four genes (one expressed in the head, and three in the embryos) of the region responded differently to photoperiod in the two lineages. We also found that the downstream genetic programs expressed during embryonic development of a future sexual female encompass ∼1600 genes, among which miRNAs, piRNAs and histone modification pathways are overrepresented. These genes mainly co-localize in two genomic regions enriched in transposable elements (TEs).

CONCLUSIONS

Our results suggest that the causal polymorphism(s) in the 840 kb region somehow impair downstream epigenetic and post-transcriptional regulations in obligate asexual lineages, thereby sustaining asexual reproduction.

A Comparison of Mate Preferences in Asexual and Allosexual Adults

Asexuality is a sexual orientation characterized by a lack of sexual attraction. Sexual attraction is likely associated with preferences for certain characteristics in romantic partners, such as physical attractiveness. Preferred partner characteristics can be influenced by an individual's sexual orientation, gender, and age. Allosexual (N = 239; male = 48, female = 181, other = 4; Age M = 20.48 years) and asexual participants (N = 149; male = 36, female = 88, other = 23; Age M = 25.54 years) recruited from a pool of psychology students and through online asexual communities were presented with a survey in which a total of 388 participants rated 13 characteristics according to how desirable they were in a potential long-term romantic partner. Characteristics that are related to physical attractiveness were predicted to be rated lower by asexual participants than by allosexual participants. Asexual participants rated the desire to have children as being less desirable in a romantic partner than allosexual participants did. However, preferences for other traits, such as exciting personality, creative and artistic, and religious, were dependent on interactions of gender and attraction to men or women. Because asexual individuals report generally lower levels of sexual attraction, it will be important for future research to consider romantic attraction as a more nuanced measure than sexual orientation alone when considering sex differences in asexual and allosexual populations.

Beliefs About the Inevitability of Sexual Attraction Predict Stereotypes About Asexuality

Similar to other sexual minorities, asexual individuals often face prejudice and stereotyping. However, the source of these attitudes and beliefs is not well understood. We hypothesized that asexual stereotypes stem from the belief that sexual attraction is an inevitable part of human development. This attraction inevitability assumption can lead to the deduction that people who identify as asexual do so because they are going through a transitory stage or excusing socially avoidant tendencies. To test this stereotype deduction account, we examined whether specific asexual stereotypes (immaturity and non-sociality) were associated with adherence to the attraction inevitability assumption. Heterosexual participants (N = 322; 201 women, 114 men; mean age 34.6 yrs.) from the UK and the US read vignettes describing a target character that was either asexual or heterosexual. People who assumed that attraction is inevitable were more likely to evaluate asexual targets (but not heterosexual targets) as immature and non-social. The impact of the sexual inevitability assumption was present even when social dominance orientation, an attitude closely related to negativity toward all sexual minorities, was accounted for. Participants who adhered to the attraction inevitability assumption also showed a reduced inclination to befriend asexual individuals. These findings suggest that generalized negativity toward sexual minorities does not fully explain stereotypes and prejudice against asexual people. Instead, the current study highlights how perceived deviation from the shared understanding of sexuality uniquely contributes to anti-asexual bias.

Understanding Attraction, Behavior, and Identity in the Asexual Community

Models of sexuality have evolved substantially in the past several decades through the inclusion of new aspects which were previously overlooked. Components such as romantic attraction and behavior have also traditionally been included in models of sexuality. However, romantic and sexual orientations do not coincide for all individuals. A population for which this is true and one that has developed a robust language for discussing romantic orientation is the asexual community. The current study aimed to explore romantic and sexual orientation through patterns found within the factors of attraction, behavior, and identity in the asexual community. The current sample composed of individuals who identified as asexual (N = 306, M_age = 27.1) was 61% female, 13% non-binary, and 10% self-described or used multiple labels. Within this sample, aspects of sexual and romantic orientations and experiences were measured, including fluidity, the quantity and type of self-identified labels, desire for romance or sex, and the role of contextual influences on these experiences. These aspects were used as the primary characteristics to construct participant profiles, both complete profiles and factor specific (attraction, behavior, identity). t-distributed stochastic neighbor embedding (tSNE) was used to find patterns of similarity between individual participant profiles. Overall, it appeared that attraction was the factor most closely associated with overall experiences; however, substantial variability existed between participants. These findings provide a mechanism for better understanding of some nuances of romantic and sexual orientation and may be a useful first step toward future inquiry and hypothesis generation.

Experiences of minority stress and their impact on suicidality among asexual individuals

INTRODUCTION

While the asexual community has become increasingly visible, the pathologization and denial of asexuality remain strong, which may be linked to a higher prevalence of suicidality in this population. The present study examined experiences of minority stress and their relationship with suicidality among asexual individuals.

METHODS

This study included a global sample of 12,449 individuals on the asexual spectrum. They completed an online survey assessing minority stress (including verbal aggression, victimization, and health care discrimination), impairment in different aspects of life, and suicidality.

RESULTS

The results showed that 64.8 % of asexual individuals had experienced minority stress based on sexual and/or romantic orientation. Approximately 32.2 % reported suicidal ideation, 10.6 % had suicide plans, and 2.7 % had attempted suicide in the past 12 months. Suicidality was more prevalent among asexual men and non-binary individuals than among asexual women. Asexual individuals who were younger, identified as transgender, and lived in lower-income countries were more likely to report suicidality. Among the different dimensions of minority stress, victimization was most significantly associated with suicidal ideation, plans, and attempts. The positive association between minority stress and suicidality was mediated by impairment in health.

LIMITATIONS

The cross-sectional nature of the data might prevent causal inferences from being drawn. Validated measures of asexual-specific minority stress were not available.

CONCLUSION

The findings have implications for asexuality-affirming mental health practices supporting asexual individuals in coping with minority stress experiences. Public education efforts are needed to raise awareness of asexuality as a valid sexual orientation and to dispel misconceptions about asexuality.

Beyond sex: A review of recent literature on asexuality

Asexuality has gained increasing attention in academic research and literature over the last two decades. This review discusses findings from 28 relevant studies published in academic journals between January 2020 and July 2022. In this time, academic literature on asexuality has focused primarily on 1) development of asexual identity, 2) sex and romantic relationships for asexual individuals, 3) intersections between asexuality and other aspects of identity, and 4) the need for increased awareness and understanding of asexuality. Future research should expand the scope of asexuality research to include more intersectional perspectives and more experiences of those on the ace spectrum who do not identify as asexual (e.g. graysexual, demisexual).

Phylotranscriptomics interrogation uncovers a complex evolutionary history for the planarian genus Dugesia (Platyhelminthes, Tricladida) in the Western Mediterranean

The Mediterranean is one of the most biodiverse areas of the Paleartic region. Here, basing on large data sets of single copy orthologs obtained from transcriptomic data, we investigated the evolutionary history of the genus Dugesia in the Western Mediterranean area. The results corroborated that the complex paleogeological history of the region was an important driver of diversification for the genus, speciating as microplates and islands were forming. These processes led to the differentiation of three main biogeographic clades: Iberia-Apennines-Alps, Corsica-Sardinia, and Iberia-Africa. The internal relationships of these major clades were analysed with several representative samples per species. The use of large data sets regarding the number of loci and samples, as well as state-of-the-art phylogenomic inference methods allowed us to answer different unresolved questions about the evolution of particular groups, such as the diversification path of D. subtentaculata in the Iberian Peninsula and its colonization of Africa. Additionally, our results support the differentiation of D. benazzii in two lineages which could represent two species. Finally, we analysed here for the first time a comprehensive number of samples from several asexual Iberian populations whose assignment at the species level has been an enigma through the years. The phylogenies obtained with different inference methods showed a branching topology of asexual individuals at the base of sexual clades. We hypothesize that this unexpected topology is related to long-term asexuality. This work represents the first phylotranscriptomic analysis of Tricladida, laying the first stone of the genomic era in phylogenetic studies on this taxonomic group.

Evidence for stronger discrimination between conspecific and heterospecific mating partners in sexual vs. asexual female freshwater snails

Once-useful traits that no longer contribute to fitness tend to decay over time. Here, we address whether the expression of mating-related traits that increase the fitness of sexually reproducing individuals but are likely less useful or even costly to asexual counterparts seems to exhibit decay in the latter. Potamopyrgus antipodarum is a New Zealand freshwater snail characterized by repeated transitions from sexual to asexual reproduction. The frequent coexistence of sexual and asexual lineages makes P. antipodarum an excellent model for the study of mating-related trait loss. Under the presumption (inherent in the Biological Species Concept) that failure to discriminate between conspecific and heterospecific mating partners represents a poor mate choice, we used a mating choice assay including sexual and asexual P. antipodarum females and conspecific (presumed better choice) vs. heterospecific (presumed worse choice) males to evaluate the loss of behavioral traits related to sexual reproduction. We found that sexual females engaged in mating behaviors with conspecific mating partners more frequently and for a greater duration than with heterospecific mating partners. By contrast, asexual females mated at similar frequency and duration as sexual females, but did not mate more often or for longer duration with conspecific vs. heterospecific males. While further confirmation will require inclusion of a more diverse array of sexual and asexual lineages, these results are consistent with a scenario where selection acting to maintain effective mate discrimination in asexual P. antipodarum is weak or ineffective relative to sexual females and, thus, where asexual reproduction is associated with the evolutionary decay of mating-related traits in this system.

Sexual Minority Identity and Mental Health Among Individuals on the Asexuality Spectrum in China: A Longitudinal Study

This study examined the association between sexual minority identity and mental health among Chinese asexual individuals. Data were collected in two waves at 12-months intervals, and 156 participants (27 male and 129 female) completed measures of the Asexuality Identification Scale (AIS) and Depression Anxiety Stress Scales at Times 1 and 2. The adjusted version of the Lesbian, Gay, and Bisexual Identity Scale was assessed at Time 1. Participants self-reported as asexual/gray-sexual and pansexual/demi-sexual, and those having an AIS ≥ 40 were classified as being on the asexuality spectrum. Compared with a control sample of lesbian and gay individuals (521 gay and 216 lesbian individuals), asexual individuals reported poorer mental health. Self-reported non-asexual individuals on the asexuality spectrum had a negative minority identity and poorer mental health than self-reported asexual individuals. Participants who changed their asexual orientation scored higher on internalized asexuality-phobia and identity uncertainty than participants maintaining an asexual orientation. At Time 1, acceptance concern, difficult process, and identity uncertainty were associated with poorer mental health. A difficult process was longitudinally associated with poorer mental health. The findings indicate that minority stress was partially related to asexual people's mental health and, for this reason, more asexuality-specific factors should be explored.

Are Autism Spectrum Disorder and Asexuality Connected?

Asexuality is a lack of sexual attraction to any gender. There is some evidence to suggest that many self-identified asexuals have a formal diagnosis of autism spectrum disorder which is characterized by deficits in social interaction and communication, as well as by restricted and repetitive interests and behaviors. Additionally, the literature shows that asexuality and lack of sexual attraction or low sexual interest is overrepresented in people with autism spectrum disorder compared with neurotypical samples. Nevertheless, no studies have been conducted to investigate the relationship between autism and asexuality in depth. We conducted a systematic review of the literature to examine whether asexuality and autism spectrum disorder are connected. We conclude that asexuality and autism share various aspects, such as a possible role of prenatal factors, reference to romantic dimensions of sexual attraction and sexual orientation, and non-partner-oriented sexual desire, but future research should explore and clarify this link.

Parthenogenesis in Darevskia lizards: A rare outcome of common hybridization, not a common outcome of rare hybridization

Hybridization is a common evolutionary process with multiple possible outcomes. In vertebrates, interspecific hybridization has repeatedly generated parthenogenetic hybrid species. However, it is unknown whether the generation of parthenogenetic hybrids is a rare outcome of frequent hybridization between sexual species within a genus or the typical outcome of rare hybridization events. Darevskia is a genus of rock lizards with both hybrid parthenogenetic and sexual species. Using capture sequencing, we estimate phylogenetic relationships and gene flow among the sexual species, to determine how introgressive hybridization relates to the origins of parthenogenetic hybrids. We find evidence for widespread hybridization with gene flow, both between recently diverged species and deep branches. Surprisingly, we find no signal of gene flow between parental species of the parthenogenetic hybrids, suggesting that the parental pairs were either reproductively or geographically isolated early in their divergence. The generation of parthenogenetic hybrids in Darevskia is, then, a rare outcome of the total occurrence of hybridization within the genus, but the typical outcome when specific species pairs hybridize. Our results question the conventional view that parthenogenetic lineages are generated by hybridization in a window of divergence. Instead, they suggest that some lineages possess specific properties that underpin successful parthenogenetic reproduction.

Sexuality, Sexual Behavior, and Relationships of Asexual Individuals: Differences Between Aromantic and Romantic Orientation

Asexuality is a complex construct with a considerable lack of research until recently. Building upon available findings, we examined the extent to which romantic orientation shapes individual and relationship experiences, and expectations of asexual individuals. Specifically, our research focused on the distinction between romantic asexual individuals, who experience romantic attraction, and aromantic asexual individuals, who do not experience romantic attraction. A cross-sectional study with members of different asexual online communities (N = 447, 55.02% women; M_age = 24.77 years, SD = 7.21) aimed at examining how both groups differ in their identification with the asexuality construct as measured by the Asexuality Identification Scale (Yule et al., 2017), individual perspectives on sexuality, sexual behavior and relationships, concerns about commitment and sexual performance in a relationship, and attachment style. Results showed that aromantic asexual individuals identified more with asexuality, reported a more avoidant attachment style, and were more concerned with relationship commitment. In contrast, romantic asexual individuals reported less sex aversion, more sexual experiences (both past and current), and more sexual partners in the past. These individuals also engaged in romantic relationships more frequently in the past, had a stronger desire to engage in a romantic relationship in future (either with or without sexual intimacy), and were more concerned with sexual performance. Overall, our findings contribute to the literature by highlighting the need to consider romantic orientation when examining asexuality and its interpersonal outcomes.

Concordance Between Romantic Orientations and Sexual Attitudes: Comparing Allosexual and Asexual Adults

Sexual and romantic orientations are often considered one and the same, and attitudes about engaging in sexual behavior are assumed to be predominantly positive. The current study explored the concordance between sexual and romantic orientations among allosexual and asexual adults as well as the frequency with which they identify as having a sex-positive, sex-neutral, or sex-averse attitude. As expected, allosexual adults were largely sex-positive (82%) and almost all (89%) had a romantic orientation that matched their sexual orientation. In contrast, we found that only 37% of asexual adults had concordant sexual and romantic orientations and that most asexual adults self-identify as either sex-neutral (41%) or sex-averse (54%). Further, we used a semantic differential task to assess sexual intimacy attitudes and how they varied for adults based on sexual attitude. Asexual adults, regardless of sexual attitude, had less positive attitudes overall than allosexual adults. Interestingly, aromantic asexual adults did not have more negative attitudes about sexual intimacy than romantic asexual participants. Although asexual adults held less positive attitudes about sex than allosexual adults, there was considerable heterogeneity within our asexual sample. The current study provides further insight into the concordance between romantic and sexual orientation, and the associations among sexual and intimacy attitudes for both allosexual and asexual adults. These findings will have implications for future research on how asexual adults navigate romantic relationships.

A Scoping Review of Empirical Asexuality Research in Social Science Literature

Research on asexuality as a part of the experience of human sexuality has increased over the last two decades. However, there has not yet been a systematic review of the extant literature on asexuality. This paper aims to provide a systematic scoping review of literature on asexuality with articles published in 2004 through August 2021. After a systematic search procedure, 48 studies were included. A codebook was developed to extract broad information about the literature on asexuality, including sampling techniques, research participant sociodemographics, and conceptualization of asexuality. Results of the review indicate that the research is currently split between qualitative and quantitative methods. The literature primarily relied on convenience sampling within asexual online communities. The primary online community was Asexual Visibility and Education Network (AVEN), which may have contributed to the majority of participants being White, presumptively cisgender, women between the ages of 20-30. Analysis of the overall literature scope demonstrates no support for asexuality as a medical condition (i.e., a disorder requiring treatment) and instead supports the need to recognize asexuality as a complex identity and sexual orientation. Implications for research are discussed, such as the need for additional research on the topic of human sexuality that includes asexuality as a sexual orientation as well as the need for more intersectional research within the literature.

Premeiotic endoreplication is essential for obligate parthenogenesis in geckos

Obligate parthenogenesis evolved in reptiles convergently several times, mainly through interspecific hybridization. The obligate parthenogenetic complexes typically include both diploid and triploid lineages. Offspring of parthenogenetic hybrids are genetic copies of their mother; however, the cellular mechanism enabling the production of unreduced cells is largely unknown. Here, we show that oocytes go through meiosis in three widespread, or even strongly invasive, obligate parthenogenetic complexes of geckos, namely in diploid and triploid Lepidodactylus lugubris, and triploid Hemiphyllodactylus typus and Heteronotia binoei. In all four lineages, the majority of oocytes enter the pachytene at the original ploidy level, but their chromosomes cannot pair properly and instead form univalents, bivalents and multivalents. Unreduced eggs with clonally inherited genomes are formed from germ cells that had undergone premeiotic endoreplication, in which appropriate segregation is ensured by the formation of bivalents made from copies of identical chromosomes. We conclude that the induction of premeiotic endoreplication in reptiles was independently co-opted at least four times as an essential component of parthenogenetic reproduction and that this mechanism enables the emergence of fertile polyploid lineages within parthenogenetic complexes.

Beyond the Label: Asexual Identity Among Individuals on the High-Functioning Autism Spectrum

Researchers have suggested that asexuality, which has been conceptualized traditionally as a persistent lack of sexual attraction to others, may be more common among individuals with autism spectrum disorder than in the neurotypical population. However, no studies to date have considered how these individuals understand and conceptualize their sexual identity. The aim of this study was to provide a more nuanced understanding of asexuality among individuals with high-functioning autism spectrum disorder (HF-ASD) than has been done in the past. Individuals with ASD, 21-72 years old (M = 34.04 years, SD = 10.53), were recruited from online communities that serve adults with ASD and Amazon's Mechanical Turk to complete an online survey of sexual and gender identity. Overall, 17 (5.1%) participants who met study criteria (N = 332) self-identified as asexual. However, 9 of the 17 people identifying as asexual expressed at least some sexual attraction to others. In addition, based on open-ended responses, some participants linked their asexual identity more with a lack of desire or perceived skill to engage in interpersonal relations than a lack of sexual attraction. Results suggest that researchers should be cautious in attributing higher rates of asexuality among individuals with ASD than in the general population to a narrow explanation and that both researchers and professionals working with individuals with ASD should consider multiple questions or approaches to accurately assess sexual identity.

The Self-Identification, LGBTQ+ Identity Development, and Attraction and Behavior of Asexual Youth: Potential Implications for Sexual Health and Internet-Based Service Provision

While often included in the spectrum of sexual minority identities, asexuality receives comparatively little attention. Awareness and understanding remains limited, and knowledge has been generated primarily from adult populations. This paper employs a sample of 711 self-identified asexual youth (aged 14-24, M = 17.43 years) who identified as members of the LGBTQ+ community to consider the implications of a number of different areas for service provision. Two-thirds (66.8%) of participants identified as gender minorities within the spectrum of transgender and non-binary identities. Findings include aspects of participants' LGBTQ+ developmental processes, including that only 14.3% had disclosed their LGBTQ+ status to everyone in their lives. However, just 2.4% had disclosed to no one. Their attraction and sexual activity were also explored, with 27.1% having never experienced any kind of romantic or sexual attraction and 20.6% having ever been sexually active. Findings regarding participants' accessing of LGBTQ+ health information and engagement in a range of offline and online LGBTQ+ community activities are also provided. Participants acquired more health information online than offline-including sexual health information. Recommendations for service provision, particularly implications for sexual health and Internet-based services, are discussed.

Asexual Identity, Personality, and Social Motivations in a New Zealand National Sample

Growing research interest in asexuality has led to several notable findings around the differences between asexual people and those with other sexual orientations. These findings have recently extended to personality, but questions remain around differences in personality between asexual people and others. Furthermore, qualitative and quantitative research disagrees about whether asexual people are less interested in close relationships than others. This paper used data from a nationally representative sample of self-identified asexual participants (Analysis 1: n_women = 216, n_men = 54, n_{gender diverse} = 13; Analysis 2: n_women = 53, n_men = 19, n_{gender diverse} = 3) and matched samples of heterosexual and lesbian, gay, and bisexual/plurisexual (LGB) participants (N's = 75-283) drawn from the New Zealand Attitudes and Values Study (Ns = 19,396-54,183) to explore personality (Analysis 1) and approach and avoidance social motivations (Analysis 2). Compared to heterosexuals, asexual participants reported significantly lower extraversion, agreeableness, and conscientiousness, and higher emotionality, openness, and honesty-humility. Compared to those who identified as LGB, asexual participants reported significantly lower extraversion and agreeableness and higher honesty-humility. In addition, asexual participants scored significantly lower on approach (but not avoidance) social motivation than both heterosexual and LGB participants, indicating that they are less motivated to enhance positive experiences and behavior in their social relationships. These results help to clarify how personality and social motivations covary with sexual identity.

Contextualizing the Well-being of Asexual Youth: Evidence of Differences in Family, Health, and School Outcomes

Despite increasing efforts to better understand sexual and gender minority youth (SGMY), asexual youth remain understudied. This study examines differences in health, family support, and school safety among asexual youth (n = 938) from a national study of SGMY (N = 17,112) ages 13-17. Compared to non-asexual youth, asexual youth were more likely to identify as transgender and report a disability, and less likely to identify as Black or Hispanic/Latino. Transgender (versus cisgender) asexual youth fared worse on most study outcomes. Cisgender asexual (versus cisgender non-asexual) youth fared worse on all study outcomes. Transgender asexual (versus transgender non-asexual) youth reported lower sexuality-related family support. These findings underscore the role of gender identity in understanding the experiences of asexual youth.

Ace and aro lesbian art and theory with Agnes Martin and Yayoi Kusama

This article draws on the field of asexuality studies and the growing work of aromanticism studies to think about whether and how we can theorize lesbian studies from asexual (ace) and aromantic (aro) perspectives. Aces experience "the lack of sexual attraction to others, or low or absent interest in or desire for sexual activity" (Asexual Visibility and Education Network) and aros experience little or no romantic attraction to others. While lesbian studies has countless examples of "asexual resonances," or lesbian theorizations that focus on intimacy between women in ways that do not centralize sex and sometimes do not centralize romance-such as those of Boston Marriages and intimate friendships, women identified women, single lesbian figures and spinsters, and lesbian kinship networks that are erotic if not sexual or romantic in nature-little work thus far has explored lesbian identities using the frameworks of asexuality and even more so of aromanticism. This piece explores ace and aro lesbianism by focusing on two artists: abstract expressionist Canadian-American painter Agnes Martin (1912-2004) and pop art multi-media Japanese artist Yayoi Kusama (b.1929). Martin has been regarded as lesbian and Kusama as a sexually repressed heterosexual, with neither artist widely understood nor celebrated for the ace and aro elements of their identities, despite evidence suggesting that both artists might be ace and aro. Opening up understandings of lesbianism beyond the sexual and romantic, I argue, allows for a dynamic positioning of lesbianism as a relational quality that can be extended to countless artists, figures, literary texts, and films.

Determination of the reference genes for qRT-PCR normalization and expression levels of MAT genes under various conditions in Ulocladium

The genus Ulocladium is thought to be strictly asexual. One of the possible reasons for the lack of sexuality in Ulocladium species is the absence of the stimulus of environmental factors. Sexual reproduction in ascomycetes is controlled by a specific region in the genome referred to as mating-type locus (MAT) that consists of two dissimilar DNA sequences in the mating partners, termed MAT1-1 and MAT1-2 idiomorphs. To identify the response of MAT loci to environmental conditions, the mRNA transcription level of MAT1-1-1 and MAT1-2-1 genes was tested using qRT-PCR under different temperatures (−20 °C, −10 °C, 0 °C, 10 °C, 20 °C, 30 °C and 40 °C), culture medias (CM, OA, HAY, PCA, PDA and V8), photoperiods (24 h light, 24 h dark, 12 h light/12 h dark, 10 h light/14 h dark and 8 h light/16 h dark), and CO₂ concentrations (0.03%, 0.5%, 1%, 5%, 10%, 15% and 20%). For obtaining reliable results from qRT-PCR, the most stable internal control gene and optimal number of reference genes for normalization were determined under different treatments. The results showed that there is no universal internal control gene that is expressed at a constant level under different experimental treatments. In comparison to various incubation conditions, the relative expression levels of both MAT genes were significantly increased when fungal mycelia were grown on HAY culture media at 0–10 °C with a light/dark cycle, indicating that temperature, culture media, and light might be the key environmental factors for regulating the sexuality in Ulocladium. Moreover, MAT1-1-1 and MAT1-2-1 genes showed similar expression patterns under different treatments, suggesting that the two MAT genes might play an equally important role in the sexual evolutionary process.

Asexual-Identified Adults: Interactions with Health-Care Practitioners

Historically, people with minority sexual and gender identities (e.g., gay, lesbian, bisexual, transgender) have been pathologized by mental and medical health practitioners. The potential for pathologization of asexuality is particularly salient considering a lack of sexual desire or interest has been studied in relationship to depression, antidepressant medication, and hypothyroidism. To explore this potential pathologization, asexual individuals were asked about their interactions with mental health and medical practitioners. The study included 136 adult participants, primarily from the U.S., who self-identified as asexual. Participants completed an online survey which contained questions about their experiences with mental health and medical practitioners. Results indicated that the majority of participants did not disclose their identity and felt uncomfortable discussing issues related to sexuality with their providers. Participants were more likely to disclose their asexual identity to mental health providers, as compared to medical providers. Participants who had positive experiences were more likely than those who had negative experiences to indicate that their practitioners were familiar with asexuality, accepted the participant's identity completely, and reacted to the disclosure in a positive and affirming manner. Positive experiences included practitioners educating themselves about asexuality, while negative experiences included practitioners disbelieving the existence of asexuality, and between one quarter and one half of participants reported that practitioners attributed their asexuality to a health condition. The findings from this study demonstrate the importance of including information about asexual identities in health education and ongoing diversity training in order to increase the cultural sensitivity of health practitioners.

Ace and Aro: Understanding Differences in Romantic Attractions Among Persons Identifying as Asexual

First characterized by Kinsey in 1948, asexuality can be broadly defined as an absence of sexual attraction, with approximately 1% of the population identifying as asexual. While asexuality research has flourished recently, very few papers have investigated the unique mechanism of romantic attraction in asexual people, notably that some experience romantic attraction (romantic asexual) while others do not (aromantic asexual). This study compared romantic and aromantic asexual individuals through secondary data analysis on demographic, behavioral, psychological, and physiological measures as the primary objective and compared asexual people to allosexual people on some measures as a secondary aim. After combining data from seven previous asexuality studies (n = 4032 total), we found that 74.0% of asexual people reported experiencing romantic attraction. No significant difference was found in distribution of men and women between the aromantic and romantic asexual groups, though the asexual group showed higher proportions of women and non-binary genders compared to the allosexual comparison group. Romantic asexual participants reported a diverse range of romantic orientations, with only 36.0% reporting a heteroromantic orientation, compared to 76.2% of allosexual participants. As predicted, romantic asexual individuals were more likely to have been in a relationship when completing the survey, reported more past romantic and sexual partners and more frequent kissing than aromantic asexual people, and experienced more partner-oriented sexual desire than the aromantic asexual group. There were also differences in personality as romantic asexual people were less cold, more nurturant, and more intrusive than the aromantic asexual group. No difference was seen between romantic and aromantic asexual individuals in demographic characteristics, likelihood of having children, solitary sexual desire, physiological sexual functioning, frequencies of masturbation and sexual fantasy, or depression. These similarities and differences between romantic and aromantic asexual people highlight the diversity within the asexual community.

Brief Report: Asexuality and Young Women on the Autism Spectrum

Existing research suggests that people with Autism Spectrum Disorder (ASD) are more likely than those without ASD to self-identify as asexual, or as being on the asexual spectrum. This study contributes to the literature by exploring aspects of sexuality and well-being in a large, community-based sample of young women (18-30 years old) with ASD (N = 247) and comparing the experiences of those with asexual spectrum identities and those with other sexual orientations (e.g., gay, bisexual, heterosexual). In the present sample, asexual participants reported less sexual desire and fewer sexual behaviors than those with other sexual orientations, but greater sexual satisfaction. Being on the asexual spectrum also was associated with lower generalized anxiety symptoms. Clinical and research implications are discussed.

Understanding Alcohol and Tobacco Consumption in Asexual Samples: A Mixed-Methods Approach

Existing research suggests significant differences in alcohol and tobacco consumption trends according to one's sexual orientation. However, asexual people have not yet been included in these comparisons. In this mixed-methods, two-part study, we sought to compare group differences in alcohol and tobacco consumption among sexual orientations, focusing on asexual people, sexual people, and those in the "gray" area between asexual and sexual (i.e., "gray-asexual"). Data for Study 1 came from four British studies: National Surveys of Sexual Attitude and Lifestyles I, II, and III in 1990, 2000, and 2010 (NATSAL I, II, III) and Towards Better Sexual Health (TBSH) in 2000. Sample sizes for each study by gender are: NATSAL I-M: 1923 F: 3511; NATSAL II-M: 4604 F: 6031; NATSAL III-M: 6122 F: 7966; TBSH-M: 347 F: 552. Notably, asexual and gray-asexual respondents were found to consume significantly less alcohol and were more likely to abstain from drinking alcohol altogether, compared to allosexual respondents. Differences in tobacco consumption were only statistically significant for asexual respondents in two of three studies that included tobacco consumption. Each of the four studies also found that asexual and gray-asexual respondents were more likely to be non-drinkers (40.0-77.8%, asexual and 28.1-50.1% gray-asexual, non-drinkers, respectively) than allosexual respondents (10.2-27.2%, non-drinkers). Interviews conducted in Study 2 identified somatic, social, and psychological experiences and motivations that may shed light on the reasons for lower drinking frequencies among asexual individuals. Variability in alcohol consumption levels among asexual, lesbian, gay, and bisexual respondents, and the general population raises new questions about the motivations for why people consume alcohol.

Asexuality is inversely associated with positive body image in British adults

Research on positive body image has infrequently considered sexual minority orientations beyond lesbians, gay men, and bisexual persons. Indeed, there is no existing research on the relationships between body image and asexuality, which refers to a lack of sexual attraction to anyone or anything. In two studies, we rectified this by examining associations between asexuality – operationalised as a continuous construct – and indices of positive body image. In Study 1, 188 Britons from the community completed measures of asexuality and body appreciation. Once the effects of self-identified sexual orientation, relationship status, and body mass index (BMI) had been considered, asexuality was found to be significantly and negatively associated with body appreciation in women and men. In Study 2, an online sample of 377 Britons completed measures of asexuality, body appreciation, functionality appreciation, body acceptance from others, and body image flexibility. Beyond the effects of sexual orientation, relationship status, and BMI, asexuality was significantly and negatively associated with all four body image constructs in men, and with body appreciation and functionality appreciation in women. Although asexuality only explained a small proportion of the variance in positive body image (3–11%) and further studies are needed, the relationship appears to be stable.

Putatively asexual chrysophytes have meiotic genes: evidence from transcriptomic data

Chrysophytes are a large group of heterotrophic, phototrophic, or even mixotrophic protists that are abundant in aquatic as well as terrestrial environments. Although much is known about chrysophyte biology and ecology, it is unknown if they are sexual or not. Here we use available transcriptomes of 18 isolates of 15 putatively asexual species to inventory the presence of genes used in meiosis. Since we were able to detect a set of nine meiosis-specific and 29 meiosis-related genes shared by the chrysophytes, we conclude that they are secretively sexual and therefore should be investigated further using genome sequencing to uncover any missed genes from the transcriptomes.

Evolution of asexual and sexual reproduction in the aspergilli

Aspergillus nidulans has long-been used as a model organism to gain insights into the genetic basis of asexual and sexual developmental processes both in other members of the genus Aspergillus, and filamentous fungi in general. Paradigms have been established concerning the regulatory mechanisms of conidial development. However, recent studies have shown considerable genome divergence in the fungal kingdom, questioning the general applicability of findings from Aspergillus, and certain longstanding evolutionary theories have been questioned. The phylogenetic distribution of key regulatory elements of asexual reproduction in A. nidulans was investigated in a broad taxonomic range of fungi. This revealed that some proteins were well conserved in the Pezizomycotina (e.g. AbaA, FlbA, FluG, NsdD, MedA, and some velvet proteins), suggesting similar developmental roles. However, other elements (e.g. BrlA) had a more restricted distribution solely in the Eurotiomycetes, and it appears that the genetic control of sporulation seems to be more complex in the aspergilli than in some other taxonomic groups of the Pezizomycotina. The evolution of the velvet protein family is discussed based on the history of expansion and contraction events in the early divergent fungi. Heterologous expression of the A. nidulans abaA gene in Monascus ruber failed to induce development of complete conidiophores as seen in the aspergilli, but did result in increased conidial production. The absence of many components of the asexual developmental pathway from members of the Saccharomycotina supports the hypothesis that differences in the complexity of their spore formation is due in part to the increased diversity of the sporulation machinery evident in the Pezizomycotina. Investigations were also made into the evolution of sex and sexuality in the aspergilli. MAT loci were identified from the heterothallic Aspergillus (Emericella) heterothallicus and Aspergillus (Neosartorya) fennelliae and the homothallic Aspergillus pseudoglaucus (=Eurotium repens). A consistent architecture of the MAT locus was seen in these and other heterothallic aspergilli whereas much variation was seen in the arrangement of MAT loci in homothallic aspergilli. This suggested that it is most likely that the common ancestor of the aspergilli exhibited a heterothallic breeding system. Finally, the supposed prevalence of asexuality in the aspergilli was examined. Investigations were made using A. clavatus as a representative 'asexual' species. It was possible to induce a sexual cycle in A. clavatus given the correct MAT1-1 and MAT1-2 partners and environmental conditions, with recombination confirmed utilising molecular markers. This indicated that sexual reproduction might be possible in many supposedly asexual aspergilli and beyond, providing general insights into the nature of asexuality in fungi.

Patterns of Asexuality in China: Sexual Activity, Sexual and Romantic Attraction, and Sexual Desire

This study examined patterns of asexuality in Chinese asexual people in terms of sexual activities, sexual/romantic attraction, and sexual desire. The sample included 227 (64 men and 163 women) asexual participants and 57 (26 men and 31 women) uncertain asexual participants recruited from social networks for asexual people. The control group included 217 (115 men and 102 women) heterosexual participants recruited from general social networks. Participants scoring 40 or higher on the Asexuality Identification Scale were classified as asexual. Asexual participants reported having less frequent masturbation, sexual intercourse experience, and sexual and romantic attraction compared to heterosexual participants. Lower sexual attraction among asexuals indicated that "people who experience little or no sexual attraction" would be a more appropriate definition of asexuality. The pattern of uncertain asexual participants' sexual/romantic attraction and sexual desire was intermediate between heterosexual and asexual participants. Asexual participants scored significantly lower on dyadic sexual desire and slightly lower on solitary sexual desire than heterosexual participants. There were significant differences in sexual activities and solitary sexual desire among romantic orientation categories. Homoromantic participants showed higher dyadic sexual desire and were more likely to engage in masturbation, indicating the heterogeneity among asexual people. The findings indicated that Chinese asexual people showed similar patterns of asexuality as in Western nations. Specifically, asexual people have little or no sexual attraction, non-partner-orientated sexual desire, and are heterogeneous in sexual activities and sexual desire. This implies similar mechanisms underlying the etiology of asexuality across cultures.

The Co-Occurrence of Asexuality and Self-Reported Post-Traumatic Stress Disorder Diagnosis and Sexual Trauma Within the Past 12 Months Among U.S. College Students

An increasing number of individuals identify as asexual. It is important to understand the relationship between a diagnosis of post-traumatic stress disorder or a history of sexual trauma co-occurs with asexual identity. We aimed to assess whether identification as asexual was associated with greater likelihood for self-reported PTSD diagnosis and history of sexual trauma within the past 12 months. Secondary data analysis was undertaken of a cross-sectional survey of 33,385 U.S. college students (12,148 male, 21,237 female), including 228 self-identified asexual individuals (31 male, 197 female), who completed the 2015-2016 Healthy Minds Study. Measures included assessment of self-report of prior professional diagnosis of PTSD and self-report of prior sexual trauma in the past year. Among non-asexual participants, 1.9% self-reported a diagnosis of PTSD and 2.4% reported a history of sexual trauma in the past 12 months. Among the group identified as asexual, 6.6% self-reported a diagnosis of PTSD and 3.5% reported a history of sexual assault in the past 12 months. Individuals who identified as asexual were more likely to report a diagnosis of PTSD (OR 4.44; 95% CI 2.32, 8.50) and sexual trauma within the past 12 months (OR 2.52; 95% CI 1.20, 5.27), compared to non-asexual individuals. These differences persisted after including sex of the participants in the model, and the interaction between asexual identification and sex was not significant in either case. Asexual identity was associated with greater likelihood of reported PTSD diagnosis and reported sexual trauma within the past 12 months. Implications for future research on asexuality are discussed.

Sociodemographic Correlates of Sexlessness Among American Adults and Associations with Self-Reported Happiness Levels: Evidence from the U.S. General Social Survey

Although sexual activity is commonly believed to be a key component of emotional well-being, little is known about the factors associated with the absence of sexual activity or its associations with self-reported happiness. Using the U.S. General Social Survey-National Death Index 2008 dataset, a series of nationally representative surveys (1988-2002), this study analyzed the sociodemographic and lifestyle factors associated with past-year sexlessness and self-reported happiness among American adults (n = 17,744). After adjustment for marital status, there were no significant time trends evident in the proportion of American adults reporting past-year sexlessness. Among participants (age = 18-89 years), 15.2% of males and 26.7% of females reported past-year sexlessness while 8.7% of males and 17.5% of females reported no sex for 5 years or more. For both genders, past-year sexlessness was most strongly associated with older age and being currently non-married in the multivariable models. Among males, the multivariable analysis also showed that sexlessness was associated with providing less than 20% of the household income (OR 2.27). In female participants, sexlessness was associated with very low income, poor health, lower financial satisfaction, absence of children, and having conservative sexual attitudes (OR 1.46-3.60). For both genders, Black race was associated with a much lower likelihood of sexlessness among currently non-married adults. The purported detrimental impact of sexlessness on self-reported happiness levels was not evident in this large, nationally representative study after adjusting for sociodemographic factors. Sexless Americans reported very similar happiness levels as their sexually active counterparts.

Asexual Identity in a New Zealand National Sample: Demographics, Well-Being, and Health

Academic interest in asexuality has increased in recent years; however, there is yet to be a national probability study exploring the correlates of self-identifying as asexual. Here, we utilized data from the 2014/15 New Zealand Attitudes and Values Study. Past research has typically used attraction-based measures; however, we asked participants to describe their sexual orientation using a self-generated, open-ended item, and 0.4% (n = 44) self-identified as asexual. We then compared self-identified asexual participants with a heterosexual reference group (n = 11,822) across a large number of demographic, psychological, and health variables. Relative to heterosexuals, self-identified asexual participants were (1) more likely to be women, and (2) substantially less likely to be cisgender, (3) in a serious romantic relationship, or (4) a parent. No deleterious mental or physical health effects were associated with asexuality when compared to heterosexuality. This study provides the first attempt at measuring self-identification as asexual in a national sample and highlights core similarities and differences between those who identify as asexual and heterosexual.

The Diversity and Prevalence of Sexual Orientation Self-Labels in a New Zealand National Sample

In this study, we asked participants to "describe their sexual orientation" in an open-ended measure of self-generated sexual orientation. The question was included as part of the New Zealand Attitudes and Values Study (N = 18,261) 2013/2014 wave, a national probability survey conducted shortly after the first legal same-sex marriages in New Zealand. We present a two-level classification scheme to address questions about the prevalence of, and demographic differences between, sexual orientations. At the most detailed level of the coding scheme, 49 unique categories were generated by participant responses. Of those who responded with the following, significantly more were women: bisexual (2.1 % of women, compared to 1.5 % of men), bicurious (0.7 % of women, 0.4 % of men), and asexual (0.4 % of women and less than 0.1 % of men). However, significantly fewer women than men reported being lesbian or gay (1.8 % of women, compared to 3.5 % of men). Those openly identifying as bicurious, bisexual, or lesbian/gay were significantly younger than those with a heterosexual orientation. This study shows diversity in the terms used in self-generated sexual orientations, and provides up-to-date gender, age, and prevalence estimates for the New Zealand population. Finally, results reveal that a substantial minority of participants may not have understood the question about sexual orientation.

Asexuality: Sexual Orientation, Paraphilia, Sexual Dysfunction, or None of the Above?

Although lack of sexual attraction was first quantified by Kinsey, large-scale and systematic research on the prevalence and correlates of asexuality has only emerged over the past decade. Several theories have been posited to account for the nature of asexuality. The goal of this review was to consider the evidence for whether asexuality is best classified as a psychiatric syndrome (or a symptom of one), a sexual dysfunction, or a paraphilia. Based on the available science, we believe there is not sufficient evidence to support the categorization of asexuality as a psychiatric condition (or symptom of one) or as a disorder of sexual desire. There is some evidence that a subset of self-identified asexuals have a paraphilia. We also considered evidence supporting the classification of asexuality as a unique sexual orientation. We conclude that asexuality is a heterogeneous entity that likely meets conditions for a sexual orientation, and that researchers should further explore evidence for such a categorization.

"And Now I'm Just Different, but There's Nothing Actually Wrong With Me": Asexual Marginalization and Resistance

This article explores the relationship between contemporary asexual lives and compulsory sexuality, or the privileging of sexuality and the marginalizing of nonsexuality. Drawing on 30 in-depth interviews, I identify four ways the asexually identified individuals in this study saw themselves as affected by compulsory sexuality: pathologization, isolation, unwanted sex and relationship conflict, and the denial of epistemic authority. I also identify five ways these asexually identified individuals disrupted compulsory sexuality: adopting a language of difference and a capacity to describe asexuality; deemphasizing the importance of sexuality in human life; developing new types of nonsexual relationships; constituting asexuality as a sexual orientation or identity; and engaging in community building and outreach. I argue that some of these practices offer only a limited disruption of compulsory sexuality, but some of these practices pose a radical challenge to sexual norms by calling into question the widespread assumption that sexuality is a necessary part of human flourishing.

Category Specificity of Self-Reported Sexual Attraction and Viewing Times to Male and Female Models in a Large U.S. Sample: Sex, Sexual Orientation, and Demographic Effects

Recent research has documented large and robust sex differences in the category specificity of self-reported sexual attraction and viewing times to men and women, with men showing more polarized responses to the two sexes than women. However, this research has been limited by the use of small and restricted samples. To address this, the current study assessed a representative sample of more than 2800 U.S. adults on demographic and attitudinal variables and on two measures of category specificity: one based on self-reported sexual attraction and the other based on viewing times to male and female swimsuit models. Key findings were replicated. On average, men were considerably more category specific in self-reported sexual attraction and viewing times than women, and this was true for both heterosexual and homosexual participants. Self-identified bisexual and asexual participants tended to be lower on category specificity than other groups. Although demographic and attitudinal factors such as age, ethnicity, state and region of residence, social class, political liberalism-conservatism, and religiousness were sometimes weakly related to category specificity, sex differences in category specificity remained robust despite demographic and attitudinal variation.

Sexual Fantasy and Masturbation Among Asexual Individuals: An In-Depth Exploration

Human asexuality is generally defined as a lack of sexual attraction. We used online questionnaires to investigate reasons for masturbation, and explored and compared the contents of sexual fantasies of asexual individuals (identified using the Asexual Identification Scale) with those of sexual individuals. A total of 351 asexual participants (292 women, 59 men) and 388 sexual participants (221 women, 167 men) participated. Asexual women were significantly less likely to masturbate than sexual women, sexual men, and asexual men. Asexual women were less likely to report masturbating for sexual pleasure or fun than their sexual counterparts, and asexual men were less likely to report masturbating for sexual pleasure than sexual men. Both asexual women and men were significantly more likely than sexual women and men to report that they had never had a sexual fantasy. Of those who have had a sexual fantasy, asexual women and men were significantly more likely to endorse the response "my fantasies do not involve other people" compared to sexual participants, and consistently scored each sexual fantasy on a questionnaire as being less sexually exciting than did sexual participants. When using an open-ended format, asexual participants were more likely to report having fantasies about sexual activities that did not involve themselves, and were less likely to fantasize about topics such as group sex, public sex, and having an affair. Interestingly, there was a large amount of overlap between sexual fantasies of asexual and sexual participants. Notably, both asexual and sexual participants (both men and women) were equally likely to fantasize about topics such as fetishes and BDSM.

Recent and dynamic transposable elements contribute to genomic divergence under asexuality

BACKGROUND

Transposable elements (TEs) are mobile pieces of genetic information with high mutagenic potential for the host genome. Transposition is often neutral or deleterious but may also generate potentially adaptive genetic variation. This additional source of variation could be especially relevant in non-recombining species reproducing asexually. However, evidence is lacking to determine the relevance of TEs in plant asexual genome evolution and their associated effects. Here, we characterize the repetitive fraction of the genome of the common dandelion, Taraxacum officinale and compare it between five accessions from the same apomictic lineage. The main objective of this study is to evaluate the extent of within-lineage divergence attributed to TE content and activity. We examined the repetitive genomic contribution, diversity, transcription and methylation changes to characterize accession-specific TEs.

RESULTS

Using low-coverage genomic sequencing, we report a highly heterogeneous TE compartment in the triploid apomict T. officinale representing up to 38.6 % of the homoploid genome. The repetitive compartment is dominated by LTR retrotransposon families accompanied by few non-LTR retrotransposons and DNA transposons. Up to half of the repeat clusters are biased towards very high read identity, indicating recent and potentially ongoing activity of these TE families. Interestingly, the five accessions are divided into two main clades based on their TE composition. Clade 2 is more dynamic than clade 1 with higher abundance of Gypsy Chromovirus sequences and transposons. Furthermore, a few low-abundant genomic TE clusters exhibit high level of transcription in two of the accessions analysed. Using reduced representation bisulfite sequencing, we detected 18.9 % of loci differentially methylated, of which 25.4 and 40.7 % are annotated as TEs or functional genes, respectively. Additionally, we show clear evidence for accession-specific TE families that are differentially transcribed and differentially methylated within the apomictic lineage, including one Copia Ale II LTR element and a PIF-Harbinger DNA transposon.

CONCLUSION

We report here a very young and dynamic repetitive compartment that enhances divergence within one asexual lineage of T. officinale. We speculate that accession-specific TE families that are both transcriptionally and epigenetically variable are more prone to trigger changes in expression on nearby coding sequences. These findings emphasize the potential of TE-induced mutations on functional genes during asexual genome evolution.

Genetic gradient of a host-parasite pair along a river persisted ten years against physical mobility: Baltic Salmo salar vs. Gyrodactylus salaris

The Atlantic salmon, Salmo salar L., in the Tornio River in the Northern Baltic Sea basin accommodates a monogenean ectoparasite, Gyrodactylus salaris. The aim of the study was to understand the population structure of apparently co-adapted host-parasite system: no parasite-associated mortality has been reported. The parasite burden among salmon juveniles (parr) was monitored along 460km of the river in 2000-2009. Among the parr, 33.0% were infected (n_fish=1913). The genetic structure of the parasite population was studied by sequencing an anonymous nuclear DNA marker (ADNAM1, three main genotypes) and mitochondrial CO1 (three clades, six haplotypes). During the ten years, the parasite population was strongly and stably genetically differentiated among up- and downstream nurseries (n_ADNAM1=411, F_ST=0.579; n_CO1=443, F_ST=0.534). Infection prevalence among the smolts migrating to sea was higher than in the sedentary parr populations (82.2%, n_fish=129). The spatial differentiation observed among the sedentary juveniles was reflected temporally in the smolt run: parasite genotypes dominating the upper part of the river arrived later than downstream dwellers (medians June 4 and June 2) to the trap 7km from the river mouth. The nuclear and mitochondrial markers were in stable disequilibrium which was not relaxed in the contact zone or among the smolts where the parasite clones often met on individual fish. Only five parasite specimens on smolts (n_worms=217) were putative recent sexual recombinants. The contribution of extant salmon hatcheries into the infection was negligible. The host salmon population in Tornio River is known to show significant spatial differentiation (F_ST=0.022). The stable spatial genetic structure of the parasite against the high physical mobility suggested a possibility of local co-adaptation of the host-parasite subpopulations.

Habitat heterogeneity favors asexual reproduction in natural populations of grassthrips

Explaining the overwhelming success of sex among eukaryotes is difficult given the obvious costs of sex relative to asexuality. Different studies have shown that sex can provide benefits in spatially heterogeneous environments under specific conditions, but whether spatial heterogeneity commonly contributes to the maintenance of sex in natural populations remains unknown. We experimentally manipulated habitat heterogeneity for sexual and asexual thrips lineages in natural populations and under seminatural mesocosm conditions by varying the number of hostplants available to these herbivorous insects. Asexual lineages rapidly replaced the sexual ones, independently of the level of habitat heterogeneity in mesocosms. In natural populations, the success of sexual thrips decreased with increasing habitat heterogeneity, with sexual thrips apparently only persisting in certain types of hostplant communities. Our results illustrate how genetic diversity-based mechanisms can favor asexuality instead of sex when sexual lineages co-occur with genetically variable asexual lineages.

A Qualitative Exploration of the "Coming Out" Process for Asexual Individuals

"Coming out" is an important process not only for identity formation in sexual minorities, but also for increasing access to romantic partners of similar identities (Vaughan & Waehler, 2010). It is unclear how asexuality and the variations within the asexual community are revealed and communicated in the coming out process. Some asexual individuals may find no practical value in coming out, as they do not seek romantic partnerships, while others pursue romantic relationships that are devoid of sexual activity. To date, virtually no psychological research has explored the "coming out" experience for those with an asexual identity. The current research analyzed the "coming out" narratives of 169 self-identified asexual individuals recruited from three online asexual communities using a phenomenological approach. Salient themes were extracted from narratives about the experience of developing an asexual identity. Themes included skepticism from family and friends, lack of acceptance and misunderstanding, non-disclosure of the asexual identity, relief upon discovering the asexual community, and the role of the internet in asexual identity discovery and expression. A theoretical model of asexual identity development is proposed based on these findings.

The Temporal Stability of Lack of Sexual Attraction Across Young Adulthood

There is a large and growing literature on the stability of sexual orientation across the lifespan. However, virtually no studies have been conducted on the longitudinal stability of any dimension of asexuality. Here I utilized Kinsey scale-type data from Wave III and Wave IV of the Add Health survey to measure the stability of indicating "not sexually attracted to either males or females" in a forced-choice, Kinsey-type scale and during the time participants were moving through early adulthood (18-26 years in Wave III and 24-32 years in Wave IV). I found that, for the most part, individuals who reported no sexual attraction in Wave III were not the same individuals who reported no sexual attraction in Wave IV, with only three out of the 25 in Wave III who indicated no sexual attraction going on to do the same in Wave IV. This inter-wave consistency was lower than it was for other sexual minorities. However, indicating no sexual attraction in one wave was still a statistically significant predictor of indicating no sexual attraction in the other wave, as was refusing to answer or indicating the "don't know" option in the other wave. These findings do not necessarily denote change in sexual attraction across waves; the fact that not answering the question in one wave was a significant predictor of indicating no sexual attraction in the other wave provides quantitative evidence for the ambiguities involved in sexual identities when sexuality is taken for granted in the broader culture. This ambiguity affects the operationalization and quantification of asexuality.

Effects of polyploidy and reproductive mode on life history trait expression

Ploidy elevation is increasingly recognized as a common and important source of genomic variation. Even so, the consequences and biological significance of polyploidy remain unclear, especially in animals. Here, our goal was to identify potential life history costs and benefits of polyploidy by conducting a large multiyear common garden experiment in Potamopyrgus antipodarum, a New Zealand freshwater snail that is a model system for the study of ploidy variation, sexual reproduction, host-parasite coevolution, and invasion ecology. Sexual diploid and asexual triploid and tetraploid P. antipodarum frequently coexist, allowing for powerful direct comparisons across ploidy levels and reproductive modes. Asexual reproduction and polyploidy are very often associated in animals, allowing us to also use these comparisons to address the maintenance of sex, itself one of the most important unresolved questions in evolutionary biology. Our study revealed that sexual diploid P. antipodarum grow and mature substantially more slowly than their asexual polyploid counterparts. We detected a strong negative correlation between the rate of growth and age at reproductive maturity, suggesting that the relatively early maturation of asexual polyploid P. antipodarum is driven by relatively rapid growth. The absence of evidence for life history differences between triploid and tetraploid asexuals indicates that ploidy elevation is unlikely to underlie the differences in trait values that we detected between sexual and asexual snails. Finally, we found that sexual P. antipodarum did not experience discernable phenotypic variance-related benefits of sex and were more likely to die before achieving reproductive maturity than the asexuals. Taken together, these results suggest that under benign conditions, polyploidy does not impose obvious life history costs in P. antipodarum and that sexual P. antipodarum persist despite substantial life history disadvantages relative to their asexual counterparts.

Extensive variation in chromosome number and genome size in sexual and parthenogenetic species of the jumping-bristletail genus Machilis (Archaeognatha)

Parthenogenesis in animals is often associated with polyploidy and restriction to extreme habitats or recently deglaciated areas. It has been hypothesized that benefits conferred by asexual reproduction and polyploidy are essential for colonizing these habitats. However, while evolutionary routes to parthenogenesis are manifold, study systems including polyploids are scarce in arthropods. The jumping-bristletail genus Machilis (Insecta: Archaeognatha) includes both sexual and parthenogenetic species, and recently, the occurrence of polyploidy has been postulated. Here, we applied flow cytometry, karyotyping, and mitochondrial DNA sequencing to three sexual and five putatively parthenogenetic Eastern-Alpine Machilis species to investigate whether (1) parthenogenesis originated once or multiply and (2) whether parthenogenesis is strictly associated with polyploidy. The mitochondrial phylogeny revealed that parthenogenesis evolved at least five times independently among Eastern-Alpine representatives of this genus. One parthenogenetic species was exclusively triploid, while a second consisted of both diploid and triploid populations. The three other parthenogenetic species and all sexual species were diploid. Our results thus indicate that polyploidy can co-occur with parthenogenesis, but that it was not mandatory for the emergence of parthenogenesis in Machilis. Overall, we found a weak negative correlation of monoploid genome size (Cx) and chromosome base number (x), and this connection is stronger among parthenogenetic species alone. Likewise, monoploid genome size decreased with elevation, and we therefore hypothesize that genome downsizing could have been crucial for the persistence of alpine Machilis species. Finally, we discuss the evolutionary consequences of intraspecific chromosomal rearrangements and the presence of B chromosomes. In doing so, we highlight the potential of Alpine Machilis species for research on chromosomal and genome-size alterations during speciation.