Search results for "Sexual Behavior"
showing 10 items of 304 documents
Evolution of avian clutch size along latitudinal gradients: do seasonality, nest predation or breeding season length matter?
2010
Birds display a latitudinal gradient in clutch size with smaller clutches in the tropics and larger in the temperate region. Three factors have been proposed to affect this pattern: seasonality of resources (SR), nest predation and length of the breeding season (LBS). Here, we test the importance of these factors by modelling clutch size evolution within bird populations under different environmental settings. We use an individual-based ecogenetic simulation model that combines principles from population ecology and life history theory. Results suggest that increasing SR from the tropics to the poles by itself or in combination with a decreasing predation rate and LBS can generate the latit…
Differential efferent projections of the anterior, posteroventral, and posterodorsal subdivisions of the medial amygdala in mice
2012
The medial amygdaloid nucleus (Me) is a key structure in the control of sociosexual behaviour in mice. It receives direct projections from the main and accessory olfactory bulbs, as well as an important hormonal input. To better understand its behavioural role, in this work we investigate the structures receiving information from the Me, by analysing the efferent projections from its anterior (MeA), posterodorsal (MePD) and posteroventral (MePV) subdivisions, using anterograde neuronal tracing with biotinylated and tetrametylrhodamine-conjugated dextranamines.The Me is strongly interconnected with the rest of the chemosensory amygdala, but shows only moderate projections to the central nucl…
Frecuencia sexual de los adolescentes españoles durante el confinamiento por COVID-19
2020
La situación de confinamiento debido a la COVID-19 ha supuesto un gran cambio en los estilos de vida de los jóvenes. Sin embargo, poco se conoce del impacto que el aislamiento ha tenido en la sexualidad de los adolescentes. Por ello, el objetivo de este trabajo es conocer la frecuencia sexual de los adolescentes durante el confinamiento y sus posibles consecuencias, todo ello con una perspectiva de género. 134 adolescentes españoles, entre 16-20 años, respondieron a una encuesta on-line ad hoc sobre sexualidad, siendo el 59.7% chicas. Un 67.2% de los participantes se consideraba heterosexual, un 91.2% estaba confinado/a con sus padres, un 59.7% estaba soltero/a y un 40.3% tenía pareja estab…
Influence of alternative mating tactics on predation risk in the damselfly Calopteryx virgo
2009
Alternative mating tactics are a widespread feature in insects. A typical form of alternative mating behaviour is being a sneaker in the vicinity of a territorial male. Such nonterritorial males have lower mating success, but they may benefit from lower energetic costs and decreased predation risk. In this study, we examined whether nonterritorial male damselflies Calopteryx virgo (L., 1758) are subject to lower predation risk than territorial males. To distinguish predation from other sources of mortality, we used models. The experiment consisted of dried male damselflies settled into the typical perching positions of territorial and nonterritorial males. Also the spatiotemporal patterns …
Mating-induced differential peptidomics of neuropeptides and protein hormones in Agrotis ipsilon moths
2018
International audience; In many insects, mating induces drastic changes in male and female responses to sex pheromones or host-plant odors. In the male moth Agrotis ipsilon, mating induces a transient inhibition of behavioral and neuronal responses to the female sex pheromone. As neuropeptides and peptide hormones regulate most behavioral processes, we hypothesize that they could be involved in this mating-dependent olfactory plasticity. Here we used next-generation RNA sequencing and a combination of liquid chromatography, matrix assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry, and direct tissue profiling to analyze the transcriptome and peptidome of diffe…
The Relationship Between Attachment and Psychopathy: A Study with a Sample of Violent Offenders
2014
This study used a mixed quantitative-qualitative methodology to investigate the relationship between attachment and psychopathy. The Psychopathy Checklist- Revised (PCL-R; Hare 2003) was administered to 139 Italian offenders who were convicted of violent crimes (murder, rape, child sexual abuse, armed robbery, assault causing bodily harm). First, we explored whether the two PCL-R items theoretically denoting devaluation of attachment bonds (promiscuous sexual behavior and many marital relationships) were able to predict PCL-R total, factor and facet scores. Subse- quently, we analyzed the transcripts of the 10 participants who obtained the highest PCL-R scores in the sample, assessing their…
Cruising y e-citas: un nuevo contexto para los encuentros sexuales entre hombres jóvenes que tienen sexo con hombres
2015
Resumen El objetivo de este artículo es el de explorar el papel que juega, en la actualidad, la irrupción de la mediación tecnológica de la información y la comunicación en la configuración de nuevos contextos para la relación sexual. En concreto, hemos explorado una práctica determinada, el cruising, entre hombres jóvenes que tienen sexo con hombres contactado a través de las e-citas. Se ha apostado por la metodología cualitativa con la intención de recopilar los discursos sobre sexualidad, riesgos y salud que se generan y construyen entre el grupo de iguales. Según extraemos de nuestro estudio, el nuevo marco que confiere esta tecnología estaría caracterizado por (a) una mayor accesibilid…
Decreased sexual signalling reveals reduced viability in small populations of the drumming wolf spider Hygrolycosa rubrofasciata.
2004
One of the important goals in conservation biology is to determine reliable indicators of population viability. Sexual traits have been suggested to indicate population extinction risk, because they may be related to viability through condition dependence. Moreover, condition-dependent sexual traits may be more sensitive indicators of population viability than early life-history traits, because deleterious fitness effects of inbreeding tend to be expressed mainly at the end of the species' life history. However, empirical evidence of the significance of sexual behaviour for population viability is missing. In this study, we examined two male sexual traits and survival in 39 different-sized …
Sexual and reproductive health risk behaviours among Palermo university students: results from an online survey.
2018
Aim. Evaluation of the knowledge and behavioral risks related to sexually transmitted infections (STIs) among the students at the University of Palermo. Materials and Methods. Cross-sectional study. An anonymous online questionnaire has been submitted to the students of Palermo University. Survey investigates to socio-demographic information, sexual habits and the level of knowledge of the STIs. Results. The sample consists of 539 students; average age 22.65 (± 2.95). The risk to have unprotected occasional sexual intercourse is related to the following circumstances: the homosexual or bisexual status, the male gender, the age of the occurrence of the first sexual intercourse, that is at 17…
A changing Sicily: Homage to Jane and Peter Schneider
2006
The research that Jane and Peter Schneider carried out in Sicily, in the little Agrigentine town of Villamaura in the 1970s and later in the area of Palermo until 2000, made an important contribution to the work of social scientists who have chosen Sicily as a site from which to contribute to the debates on the Mafia, codes of honor, reproductive behavior, and the relationship between modernity and backwardness and between society and culture. These studies bring together perspectives that draw on both the anthropology of Mediterranean societies and on historical demography in ways that have developed new and innovative research paradigms and methodologies, and have opened up new fields of …