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https://www.readbyqxmd.com/read/27913165/larger-females-are-choosier-in-the-gray-treefrog-hyla-versicolor
#1
Michael C Kuczynski, Thomas Getty, Eben Gering
Individual variation in female mate choice has important implications for sexual trait evolution and the maintenance of phenotypic diversity. In this study we examined several potential drivers of individual variation in female choosiness for the well-studied, energetically expensive courtship signal of male gray treefrogs, Hyla versicolor. Specifically, we investigated the relationship between female choosiness and other female traits (female body size, physical condition, and age) using a costly choice playback experiment where females traveled different simulated distances to reach attractive mates...
November 29, 2016: Behavioural Processes
https://www.readbyqxmd.com/read/27912243/vomeronasal-receptors-in-vertebrates-and-the-evolution-of-pheromone-detection
#2
Liliana Silva, Agostinho Antunes
Pheromones were identified as chemical signals used for intraspecific communication in insects (e.g., sexual attraction) in the 1950s. However, only almost 40 years later the vomeronasal receptors type-1 (V1R) and type-2 (V2R) were identified, usually associated with the presence of a vomeronasal organ (VNO). VRs are widespread in amphibians, reptiles, and mammals, but birds lost the VNO. Similarly, fishes lack VRs and a VNO but can still detect pheromones, instead using the olfactory receptors related to class A and class C G protein-coupled receptors...
November 28, 2016: Annual Review of Animal Biosciences
https://www.readbyqxmd.com/read/27911091/who-adopts-queer-and-pansexual-sexual-identities
#3
James S Morandini, Alexander Blaszczynski, Ilan Dar-Nimrod
Some nonheterosexual individuals are eschewing lesbian/gay and bisexual identities for queer and pansexual identities. The present study aimed to examine the sexual and demographic characteristics of nonheterosexual individuals who adopt these labels. A convenience sample of 2,220 nonheterosexual (1,459 lesbian/gay, 413 bisexual, 168 queer, 146 pansexual, and 34 other "write-in") individuals were recruited for a cross-sectional online survey. In support of our hypotheses, those adopting pansexual identities were younger than those adopting lesbian, gay, and bisexual identities, and those adopting queer and pansexual identities were more likely to be noncisgender than cisgender, and more likely to be cisgender women than men...
December 2, 2016: Journal of Sex Research
https://www.readbyqxmd.com/read/27910886/sequential-information-in-a-great-ape-utterance
#4
Pawel Fedurek, Klaus Zuberbühler, Christoph D Dahl
Birdsong is a prime example of acoustically sophisticated vocal behaviour, but its complexity has evolved mainly through sexual selection to attract mates and repel sexual rivals. In contrast, non-human primate calls often mediate complex social interactions, but are generally regarded as acoustically simple. Here, we examine arguably the most complex call in great ape vocal communication, the chimpanzee (Pan troglodytes schweinfurthii) 'pant hoot'. This signal consists of four acoustically distinct phases: introduction, build-up, climax and let-down...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27906015/validation-of-a-self-reported-hiv-symptoms-list-the-iss-hiv-symptoms-scale
#5
Raffaella Bucciardini, Katherina Pugliese, Daniela Francisci, Andrea Costantini, Elisabetta Schiaroli, Miriam Cognigni, Chiara Tontini, Stefano Lucattini, Luca Fucili, Massimiliano Di Gregorio, Marco Mirra, Vincenzo Fragola, Sara Pompili, Rita Murri, Stefano Vella
BACKGROUND: To describe the development and the psychometric properties of the Istituto Superiore di Sanità-HIV symptoms scale (lSS-HIV symptoms scale). METHODS: The ISS-HIV symptom scale was developed by an Italian working team including researchers, physicians and people living with HIV. The development process went through the following steps: (1) review of HIV/AIDS literature; (2) focus group; (3) pre-test analysis; (4) scale validation. RESULTS: The 22 symptoms of HIV-ISS symptoms scale were clustered in five factors: pain/general discomfort (7 items); depression/anxiety (4 items); emotional reaction/psychological distress (5 items); gastrointestinal discomfort (4 items); sexual discomfort (2 items)...
April 9, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27905469/selection-for-predation-not-female-fecundity-explains-sexual-size-dimorphism-in-the-orchid-mantises
#6
Gavin J Svenson, Sydney K Brannoch, Henrique M Rodrigues, James C O'Hanlon, Frank Wieland
Here we reconstruct the evolutionary shift towards floral simulation in orchid mantises and suggest female predatory selection as the likely driving force behind the development of extreme sexual size dimorphism. Through analysis of body size data and phylogenetic modelling of trait evolution, we recovered an ancestral shift towards sexual dimorphisms in both size and appearance in a lineage of flower-associated praying mantises. Sedentary female flower mantises dramatically increased in size prior to a transition from camouflaged, ambush predation to a floral simulation strategy, gaining access to, and visually attracting, a novel resource: large pollinating insects...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904805/hypothesis-on-serenoa-repens-bartram-small-extract-inhibition-of-prostatic-5%C3%AE-reductase-through-an-in-silico-approach-on-5%C3%AE-reductase-x-ray-structure
#7
Paolo Governa, Daniela Giachetti, Marco Biagi, Fabrizio Manetti, Luca De Vico
Benign prostatic hyperplasia is a common disease in men aged over 50 years old, with an incidence increasing to more than 80% over the age of 70, that is increasingly going to attract pharmaceutical interest. Within conventional therapies, such as α-adrenoreceptor antagonists and 5α-reductase inhibitor, there is a large requirement for treatments with less adverse events on, e.g., blood pressure and sexual function: phytotherapy may be the right way to fill this need. Serenoa repens standardized extract has been widely studied and its ability to reduce lower urinary tract symptoms related to benign prostatic hyperplasia is comprehensively described in literature...
2016: PeerJ
https://www.readbyqxmd.com/read/27902685/getting-to-the-bottom-of-face-processing-species-specific-inversion-effects-for-faces-and-behinds-in-humans-and-chimpanzees-pan-troglodytes
#8
Mariska E Kret, Masaki Tomonaga
For social species such as primates, the recognition of conspecifics is crucial for their survival. As demonstrated by the 'face inversion effect', humans are experts in recognizing faces and unlike objects, recognize their identity by processing it configurally. The human face, with its distinct features such as eye-whites, eyebrows, red lips and cheeks signals emotions, intentions, health and sexual attraction and, as we will show here, shares important features with the primate behind. Chimpanzee females show a swelling and reddening of the anogenital region around the time of ovulation...
2016: PloS One
https://www.readbyqxmd.com/read/27899472/autopedophilia-erotic-target-identity-inversions-in-men-sexually-attracted-to-children
#9
Kevin J Hsu, J Michael Bailey
The most salient dimension of men's sexual orientation is gender: attraction to males versus females. A second dimension is sexual maturity: attraction to children versus adults. A less appreciated dimension is location: attraction to other individuals versus the sexual fantasy of being one of those individuals. Men sexually aroused by the idea or fantasy of being the kinds of individuals to whom they are sexually attracted have an erotic-target identity inversion (ETII). We conducted an online survey to investigate the prevalence and phenomenology of ETIIs among 475 men sexually attracted to children...
November 29, 2016: Psychological Science
https://www.readbyqxmd.com/read/27885042/evidence-for-partial-overlap-of-male-olfactory-cues-in-lampreys
#10
Tyler J Buchinger, Ke Li, Mar Huertas, Cindy F Baker, Liang Jia, Michael C Hayes, Weiming Li, Nicholas S Johnson
Animals rely on a mosaic of complex information to find and evaluate mates. Pheromones, often comprised of multiple components, are considered to be particularly important for species-recognition in many species. While the evolution of species-specific pheromone blends is well-described in many insects, very few vertebrate pheromones have been studied in a macro-evolutionary context. Here, we report a phylogenetic comparison of multi-component male odours that guide reproduction in lampreys. Chemical profiling of sexually mature males from eleven species of lamprey, representing six of ten genera and two of three families, indicated the chemical profiles of sexually mature male odours are partially shared among species...
November 24, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27882477/sexual-fantasy-and-masturbation-among-asexual-individuals-an-in-depth-exploration
#11
Morag A Yule, Lori A Brotto, Boris B Gorzalka
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...
November 23, 2016: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/27878410/the-sexual-orientation-and-gender-presentation-of-hijra-kothi-and-panthi-in-mumbai-india
#12
Matthew Stief
Cultural categories related to sexuality and gender vary considerably cross-culturally. While Western cultures categorize people primarily in terms of sexual attractions (i.e., gay, straight, bisexual), many cultures distinguish between groups based on additional issues such as gender role presentation and position preference in anal sex (i.e., insertive/receptive). The current study gathered data on three categories of natal males in Mumbai, India-hijra, kothi, and panthi (N = 93). Hijra are androphilic (sexually attracted to adult men), typically sexually receptive, transgender, sometimes castrated, and live in fictive kinship networks that are hierarchically organized...
November 22, 2016: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/27875569/are-men-s-perceptions-of-sexually-dimorphic-vocal-characteristics-related-to-their-testosterone-levels
#13
Michal Kandrik, Amanda C Hahn, Joanna Wincenciak, Claire I Fisher, Katarzyna Pisanski, David R Feinberg, Lisa M DeBruine, Benedict C Jones
Feminine physical characteristics in women are positively correlated with markers of their mate quality. Previous research on men's judgments of women's facial attractiveness suggests that men show stronger preferences for feminine characteristics in women's faces when their own testosterone levels are relatively high. Such results could reflect stronger preferences for high quality mates when mating motivation is strong and/or following success in male-male competition. Given these findings, the current study investigated whether a similar effect of testosterone occurs for men's preferences for feminine characteristics in women's voices...
2016: PloS One
https://www.readbyqxmd.com/read/27873056/individual-pheromone-signature-in-males-prerequisite-for-pheromone-mediated-mate-assessment-in-the-central-american-locust-schistocerca-piceifrons
#14
Christiane Stahr, Karsten Seidelmann
Living in high-density groups of animals has advantages and disadvantages for mating. The advantage of facilitated mate finding is compromised by difficulties in protecting a suitable partner from competitors. Thus, males regularly are faced with increased competition for sperm, and females with harassment by males at high population densities. To cope with these problems, mating tactics and mate choice mechanisms have to be adjusted. An adaptation to gregarious condition observed in locusts includes the use of male-emitted pheromones...
November 21, 2016: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/27873031/stability-of-sexual-attractions-across-different-timescales-the-roles-of-bisexuality-and-gender
#15
Lisa M Diamond, Janna A Dickenson, Karen L Blair
We examined the stability of same-sex and other-sex attractions among 294 heterosexual, lesbian, gay, and bisexual men and women between the ages of 18 and 40 years. Participants used online daily diaries to report the intensity of each day's strongest same-sex and other-sex attraction, and they also reported on changes they recalled experiencing in their attractions since adolescence. We used multilevel dynamical systems models to examine individual differences in the stability of daily attractions (stability, in these models, denotes the tendency for attractions to "self-correct" toward a person-specific setpoint over time)...
November 21, 2016: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/27867762/a-global-analysis-of-bird-plumage-patterns-reveals-no-association-between-habitat-and-camouflage
#16
Marius Somveille, Kate L A Marshall, Thanh-Lan Gluckman
Evidence suggests that animal patterns (motifs) function in camouflage. Irregular mottled patterns can facilitate concealment when stationary in cluttered habitats, whereas regular patterns typically prevent capture during movement in open habitats. Bird plumage patterns have predominantly converged on just four types-mottled (irregular), scales, bars and spots (regular)-and habitat could be driving convergent evolution in avian patterning. Based on sensory ecology, we therefore predict that irregular patterns would be associated with visually noisy closed habitats and that regular patterns would be associated with open habitats...
2016: PeerJ
https://www.readbyqxmd.com/read/27866390/school-based-hiv-std-testing-behaviors-and-motivations-among-black-and-hispanic-teen-msm-results-from-a-formative-evaluation
#17
Elana Morris, Pablo Topete, Catherine N Rasberry, Catherine A Lesesne, Elizabeth Kroupa, Lisa Carver
BACKGROUND: This evaluation explores experiences with, and motivations for, human immunodeficiency virus (HIV) and sexually transmitted disease (STD) testing among black and Hispanic school-aged young men who have sex with men (YMSM). METHODS: Participants were recruited at community-based organizations that serve YMSM in New York City, Philadelphia, and San Francisco. Eligible participants were 13- to 19-year-old black or Hispanic males who reported attraction to or sexual behavior with other males and/or identified as gay or bisexual, and attended at least 90 days of school in the previous 18 months...
December 2016: Journal of School Health
https://www.readbyqxmd.com/read/27862876/tomato-facultative-parthenocarpy-results-from-slagamous-like-6-loss-of-function
#18
Chen Klap, Ester Yeshayahou, Anthony M Bolger, Tzahi Arazi, Suresh K Gupta, Sara Shabtai, Björn Usadel, Yehiam Salts, Rivka Barg
The extreme sensitivity of the microsporogenesis process to moderately high or low temperatures is a major hindrance for tomato (Solanum lycopersicum) sexual reproduction and hence year-round cropping. Consequently, breeding for parthenocarpy, i.e. fertilization-independent fruit set, is considered a valuable goal especially for maintaining sustainable agriculture in the face of global warming. A mutant capable of setting high quality seedless (parthenocarpic) fruit was found following a screen of EMS mutagenized tomato population for yielding under heat stress...
November 11, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27861985/a-cry-for-help-or-sexual-perfumes-an-alternative-hypothesis-for-wasp-attraction-to-the-scent-of-caterpillar-wounded-plants
#19
Ian Kaplan
No abstract text is available yet for this article.
November 11, 2016: Plant, Cell & Environment
https://www.readbyqxmd.com/read/27861840/climatic-conditions-cause-spatially-dynamic-polygyny-thresholds-in-a-large-mammal
#20
Jeffrey A Manning, Philip D McLoughlin
1.The polygyny threshold (PT) is a critical transition point in the sexual selection process for many organisms in natural populations, characterizing when females choose to mate with an already mated male over an unmated one to improve fitness. Understanding its causes and consequences is therefore of high interest. While both theoretical and empirical work suggest that the degree of polygyny within a species is plastic and a function of male inequality, the functional relationship between underlying availability of resources occupied by breeding males under variable climatic conditions and the dynamics of PTs across space and time has received less attention...
November 15, 2016: Journal of Animal Ecology
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