Letteratura scientifica selezionata sul tema "Youth – Sexual behavior – Western Australia"

Background Youth population (10-24 years of age) comprises more than 30% of the total population in Nepal. This is the age when values are formed, many become sexually active and begin to develop a pattern of risky sexual behaviour. This makes youth more vulnerable to contacting sexually transmitted diseases including HIV/AIDS. The main objective of this study was to assess the sexual behavior among school youths of a rural far-western district, Achham, Nepal.Methods A cross sectional study was conducted among school youths aged 15 to 24 years studying at grade 11 and 12 in Achham district. Data were collected from February to April, 2011 using self-administered questionnaires from 229 boys and 156 girls of randomly selected eight higher secondary schools of the district.Results The study found that over a quarter of the respondents were sexually active before marriage, boys five times more compared to girls. More than one-fourth (28.2%) of sexually active young boys and girls were found to have engaged in multiple sexual relations; of which peers were the most common (71.1%) sexual partners. Overall, three out of every four sexually active school youths were found to have practised risky sexual behavior. The study found age of the respondent, gender, education and age at first sexual intercourse were significantly associated with the sexual behavior of the school youths.Conclusions Young people at schools were found to be engaged in unsafe sexual activities in study district. They were found initiating multiple sexual relations and pre-marital sexual relations. The use of condom was found declining in subsequent sexual contacts. Such risky sexual behaviours were putting the young population at more vulnerable to the risks of any sexually transmitted infections. Sex education would therefore be imperative to focus on sexual and reproductive health interventions targeted for the young people.DOI: http://dx.doi.org/10.3126/hprospect.v12i2.9873 Health Prospect Vol.12(2) 2013: 37-41

Laryngodus Herrich-Schaeffer, 1850, is redescribed, including, for the first time, nymphal morphology. Three species are recognised based on qualitative morphology, a principle components analysis of morphometric data, and the study of sequence data from the mitochondrial genes COI and 16S. They are: L. australiae Herrich-Schaeffer from the south-western coastal area of Western Australia, L. cervantes, sp. nov., from southern Western Australia, and L. luteomaculatus, sp. nov., from western Victoria and adjacent South Australia. Sexual dimorphism in all species and variation in males of L. luteomaculatus, sp. nov. is documented and discussed. All species and their hosts are illustrated with colour digital images; scanning electron micrographs are used to illustrate male prosternal spines, antennnae, abdominal trichobothria, and other structures. Male genitalic morphology is illustrated with line drawings. Authoritative host identifications indicate that Laryngodus is restricted to feeding on several species of Allocasuarina (Casuarinaceae); nymphs and adults are known to live on the plants and to be strongly associated with the cone-like fruits. The tribal placement of Laryngodus is discussed.

The absence of marine records for M. dalli below latitude 31�S., together with data on gonadal stages and spermatophore deposition on females of this species in the Swan estuary, provide very strong indications that the western school prawn typically breeds in estuarine environments in south-western Australia. The 0 + recruits, which first appeared in samples in February, remained in the estuary during the following months and by November had reached a size suitable for exploitation. At this time they were approaching sexual maturity and were starting to move from the shallows to the deeper waters of the estuary where they remained for their second year of life. In contrast to Australian Penaeus species, M. dalli mates during the intermoult period when the shell is hard rather than immediately after moulting.

This interpretative study examines the complexities of lesbian parents’ experiences in organized youth sport programs. Specifically, it seeks to understand youth sport as a potential site for social change that facilitates a sense of inclusive community for diverse family structures. Using thematic analysis, the author examines perspectives of nine participants from Australia, Canada, and the United States. Emphasis is placed on how the lesbian parents (a) negotiate heightened visibility, sexual stigma, and parental judgment; (b) foster social relationships through participation, volunteerism, and positive role models; and (c) create shared understanding toward building an inclusive sport culture. The findings call attention to the importance of intentional and unintentional acts (by families as well as sport organizations) that create a sense of community and an inclusive organizational culture. The connection of lesbian parents’ experiences to broader concepts, such as sexual stigma and transformative services, are also examined within the context of youth sport.

Three new genera and seven new species of fungal-feeding thrips are described from the northern, tropical zone of Australia. Majerthrips barrowi gen. et sp. n. is a large species exhibiting polymorphism associated with wing development and sex, whereas Senithrips psomus gen. et sp. n. is a minute monomorphic species with little sexual dimorphism. Also monomorphic is Jacotia rhodorcha sp.n., the fourth species described in this genus from Australia. These three were all taken during a biodiversity survey of Barrow Island, Western Australia. Structural variation in Streptothrips tribulatius sp. n. from Cape Tribulation, Queensland, confirms the existence of dimorphism in this genus between winged and wingless individuals. Stomothrips mouldeni differs from the single described species in this genus in having the mouth cone directed ventrally not posteriorly; it was collected from Cycas pruinosa in the north of Western Australia. Also in this area but living at the base of Triodia grasses, Apostlethrips apostus and A. pygus gen. et spp. n. are remarkable amongst the Eurythrips group of leaf-litter phlaeothripines in lacking sense cones on antennal segment III, and lacking tergal wing retaining setae in macropterae, also in the setose abdominal apex.

The New Zealand karaka tree, Corynocarpus laevigatus J.R. & G.Forst., is shown to be gynodioecious. Flowers on female plants have large but empty anthers and many set fruit. Flowers on male plants produce pollen and each has a fully developed ovule. On most male plants, a low proportion of flowers set fruit. Inflorescences and flowers on male and female trees are similar in overall appearance, except that the flower parts on males are larger and flowers open more widely. Even the gynoecia on male plants are larger in most respects. We also report that although trees retain their gender, their intensity of fruiting varies from year to year. Some observations indicate that other species of Corynocarpus in Australia and the south-western Pacific might also be gender dimorphic.

Increasingly, sponges are being used as models for a wide range of biological systems. However, little is known about the reproductive biology of a group that has been shown to lack gonads or gonadal ducts. The development of gametes in the oviparous demosponge Chondrilla australiensis at Fremantle, Western Australia, was investigated using light microscopy and transmission electron microscopy over 5 years. Results indicate that C. australiensis is gonochoric and oviparous. Egg and sperm development were first apparent inside choanocyte chambers, with both types of gamete apparently developing from choanocytes. During egg development, large numbers of nurse cells appeared attached to eggs, with which they fused at the time of spawning. The origin of the nurse cells remains unclear, but they may also have a choanocyte origin. Eggs took 4 weeks to develop and sperm took approximately 2 weeks, during which time the nucleus condensed and the cytoplasm reduced. Mature sperm could occupy almost the entire matrix of fecund males and were not contained in cysts. Spawning occurred in late summer and autumn over a period of 4–5 days, when the tides were at the maximum height for the month.

Population structure, reproduction, condition, movements and habitat preference were assessed for western barred bandicoots (Perameles bougainville) on Dorre and Bernier Islands over seven trapping sessions between 1988 and 1995. Data comes from 372 captures of bandicoots in 2535 trap-nights (an average of 14·7 captures per 100 trap-nights). Trap success was 5.7–25.8% on Dorre and 5.7–7.6% on Bernier. Recaptures within a trip made up 29% of bandicoot captures. The overall sex ratio (excluding recaptures) was skewed heavily towards males at 1.7: 1 for trapped animals, but varied between male and female dominance at any time according to reproductive status of females. Sex ratio of pouch young was 1.2: 1. Production of young was concentrated in the wetter winter months. The smallest western barred bandicoot with pouch young weighed 175 g. Bandicoots showed a pattern of increasing litter size with size of mother. Females with young had an average litter size of 1.8, with young reaching independence at about 100 g body weight. Large testes size relative to body size in males suggested a promiscuous mating system. Body condition could be predicted by sex (females were typically in better condition than males) and by rainfall over the previous 2 months. Some sexual dimorphism was evident, with females having longer heads and typically being heavier than males. There was no detected dimorphism between island populations. Movements of bandicoots appeared limited, with the median distance moved by animals captured more than once within a 9–11-day trapping session being 154 m. There was no significant difference in movements between the sexes, with males moving a median distance of 160 m and females 138 m within trapping sessions. The greatest movement by a male was 1020 m while the greatest distance moved by a female was 490 m. Only 13% of recorded movements were greater than 400 m. Home ranges overlapped, with 51% of traps catching more than one individual and as many as five males being caught at the same trap site. Bandicoots were widely dispersed through all habitats surveyed. Bandicoots appeared to suffer a substantial reduction in numbers on Dorre Island in a prolonged drought extending from October 1986 to April 1989, reducing overall trap success to less than 6% in the 1988 survey.

We show that the Wotjulum frog, Litoria watjulumensis (Copland, 1957), comprises two deeply divergent mitochondrial DNA lineages that are also reciprocally monophyletic for a nuclear gene locus and have discrete distributions. The taxa are differentiated in multivariate analysis of shape but show no appreciable differences in colour and pattern. The two taxa differ substantially in the degree of female biased sexual size dimorphism, with the western taxon showing considerably more pronounced dimorphism. We subsequently resurrect Litoria (Hyla) spaldingi (Hosmer, 1964) for populations from east of the Daly River system in the Northern Territory through to western Queensland and restrict L. watjulumensis to populations from the Kimberley region of north-western Australia and the Victoria River system of the western Northern Territory. The complex advertisement call of L. spaldingi is described for the first time.

Sexual segregation is best known in sexually dimorphic ungulates. Many hypotheses have been proposed to explain the evolution of sexual segregation in ungulates, but all are reducible to the influence of two factors: body size and sex-specific reproductive strategy. Definitive tests of these hypotheses are lacking in ungulates because these factors are confounded, all males being somewhat larger than females. Kangaroos represent a parallel radiation of terrestrial herbivores, but their populations are composed of a spectrum of adult body sizes, ranging from small males the same size as females to large males more than twice the size. We exploited this heteromorphism to assess the independent influences of size and sex in these ungulate analogues. We conducted a preliminary study of western grey kangaroos (Macropus fuliginosus) in north-western Victoria, Australia. Adult males predominately occupied grassland habitat, whereas females occurred mostly in lakebed, woodland and shrubland. Single-sex groups occurred more often than expected during the non-mating season. The diet of large males had the highest proportion of grass, and females had the least. These initial results indicate that both size and sex influence segregation in this species, confirming the worth of kangaroos as marsupial models for research into the evolution of sexual segregation.

Adolescence is a time of accelerated physical and sexual growth, and many students become sexually active before they finish secondary schooling. Unfortunately, many adolescents and young adults experience sexual coercion in their intimate relationships. Sexual coercion is defined broadly as verbal or physical pressure to engage in sexual activity. This study sought to examine sexual coercion experiences of Year 11-12 high school, male and female students in their peer dating and relationships. Before retrieving such information, a modified Sexual Experiences Survey (SES) questionnaire was designed. This was named the Adolescent Dating and Relationship Survey (ADRS) which, subsequently, was examined by experts in the area, and validated via a pilot study using 30 university students. Thirdly, the study administered the ADRS to 341, Year 11 and Year 12 students to examine how they responded to their sexually coercive experiences. The participants were actively engaging in relationship behaviours, with nearly 50% of the females and 70% of the males reporting a relationship with a partner of the same age. However, significantly more females dated older partners and, conversely, more male students were involved with younger partners. The female students tended to have longer relationships than the males, especially for relationships of 9 to 12 months or longer. Participants did not report sexual coercion experiences via threat or blackmail, nor were the males threatened with a weapon. The most frequently cited forms of coercion by both female and male students were: made to feel guilty, being plied with alcohol and/or other drugs, being pressured by begging and/or arguing, and being lied to. However, the female students reported being physically restrained significantly more than the males. As a group they responded to these sexually coercive acts via all forms 2 measured except the males, who did not resort to either fighting off or yelling. Talking about the experience later was the response commonly reported by the students. Further, female students responded to sexual coercion by saying either,

[Truncated abstract] In the last two decades, the use of microsatellites has revolutionized the study of ecology and evolution. Microsatellites, or short tandem repeats (STRs), are stretches of DNA repeats, 1 to 5 nucleotides long, where the number of repeats varies between individuals. They are co-dominant, highly variable, neutral markers, and are inherited in a Mendelian fashion. Microsatellite loci were isolated from Dawson’s burrowing bee, Amegilla dawsoni, a large, fast-flying solitary nesting bee endemic to the arid zone of Western Australia. Twelve polymorphic loci were found with an observed number of alleles ranging from two to 24 and observed heterozygosities between 0.17 and 0.85. These loci were used to examine two aspects of this bee’s molecular ecology; its population structure and mating system ... The molecular data were also used to show that the nesting female is the mother of all her offspring and that brood parasitism is unlikely in this species. The data indicate that females make daughters at the beginning of the season followed by large sons in the middle, and then small sons at the end. Females often place one brood cell directly above another. The distribution of sex and morph in these doublets follows a pattern with most containing a female on the bottom and a minor male on the top, followed by almost equal numbers of female on top of female and minor male on top of major male. This pattern is likely favoured by emergence patterns, with males emerging before females and minor males emerging before major males. I suggest that although minor males have low reproductive success, their production may nonetheless be beneficial in that minor males open up emergence tunnels for their larger and reproductively more valuable siblings. In addition, minor males may represent the ‘best of a bad job’ provisioning tactic arising from changes in the costs to nesting females of gathering brood provisions over the course of the flight season. This thesis demonstrates that microsatellites can be used to answer many questions regarding the molecular ecology of a species from the behaviour of the bees on a population scale to the mating behaviour of individual bees and how they allocate resources for the next generation. Many other aspects of the bee’s ecology could also be examined now that suitable molecular markers exist.

Thesis (PhD)--Stellenbosch University, 2011.
ENGLISH ABSTRACT: INTRODUCTION Religion is important in Africa and many churches are involved in HIV ministry. Prevention programmes, however, are less frequent in the church setting and there is little evaluation of them. If an effective model is found, it can contribute to HIV prevention efforts in Sub-Saharan Africa. This study was conducted in the Cape Town Diocese of the Anglican Church. Fikelela, an HIV/AIDS project of the Diocese, developed a 20-session peer education programme (Agents of Change) aimed at changing the risky sexual behaviour of youth. Workshops were also aimed at parents. A literature review was conducted looking at three areas: 'theories of behaviour change', 'adolescent sexual relationships' and 'religion and HIV'. A conceptual framework for the programme was developed by integrating findings from the literature review. The aim of this research was to evaluate the effectiveness and functioning of the programme, to develop a best practice model and to make recommendations for the use of the programme in the wider church. METHODS Outcome mapping was used to integrate an approach to the design, monitoring and evaluation of the programme. Changes in project partners, key project strategies and organisational practices were all monitored. Project partners were defined as peer educators, facilitators, young people, clergy and parents. Monitoring allowed an in-depth understanding of which aspects of the programme worked. Evaluation was designed as a quasi-experimental study that compared non-randomly chosen intervention and control groups. 1352 participants took part at base-line, 176 returned matched questionnaires in the intervention groups and 92 in the control groups. Reported changes in attitudes, knowledge and sexual behaviour were compared between the two groups. RESULTS The main factors leading to the success of the programme were: a well developed curriculum and programme, effective training camps, the support given by facilitators to peer educators, ongoing mentoring and training, role modelling by peer educators, a participatory style of education and positive peer pressure within a strong church based social network. Challenging the church.s negative attitude to condoms was also important. The weakest areas of the programme were amongst clergy and parents and in challenging media messages and norms on gender. The project impact evaluation showed significant differences at baseline between genders in terms of sexual beliefs and behaviour. There was no significant impact of religiosity on sexual activity. The programme was successful at increasing condom usage (Condom use score 3.5 vs. 2.1; p=0.02) and reduced sexual debut (9.6% vs. 22.6%; p=0.04). There was increased abstinence amongst the intervention group, but it did not reach statistical significance (22.5% vs. 12,5%; p=0.25). There was no effect on the number of partners (Mean 1.7 vs. 1.4; p=0.67). CONCLUSIONS Implementation: The programme should be promoted as a youth development programme rather than an HIV prevention programme. Priority should be given to churches in communities with the highest HIV rates. The target group should include younger teens. Peer educators should be selected by peers not by adults. Strategies: The strategies of training camp and quarterly gatherings are effective, but a new strategy needs to be devised to impact the parents. Content: The programme should build self-efficacy amongst the youth, develop a critical consciousness about sexual health, provide positive messages rather than fear-inducing ones, address sexual coercion and persuasion, explore the linking of condom use with trust, address inter-generational sex and promote community outreach and advocacy activities. The programme is effective and meets the threshold of evidence required to be rolled out. It should be rolled out through the Anglican Church with its estimated membership of two million and could be adapted for other denominations as well.
AFRIKAANSE OPSOMMING: INLEIDING Godsdiens is belangrik in Afrika en talle kerke is betrokke by HIV-bediening. Voorkomingsprogramme is egter ongewoon in die kerkomgewing en die evaluering daarvan vind selde plaas. Indien 'n effektiewe voorkomingsprogram model gevind kan word, behoort dit 'n belangrike bydrae te lewer tot HIV infeksie voorkomingspogings in Sub-Sahara Afrika. Hierdie studie is gedoen onder die lidmate van die Kaapstadse Biskoplike gebied van die Anglikaanse Kerk. 'n Bestaande HIV/VIGS projek van die Biskoplike gebied, genaamd Fikelela, het 'n 20-sessie portuurgroepopvoedingsprogram (Agente van Verandering) ontwikkel wat gemik is op die verandering van riskante seksuele gedrag onder die jeug. Daar was ook werkswinkels gemik op ouers. 'n Voorstellingsraamwerk vir die program is ontwikkel deur die integrasie van gedragsveranderingsteorieë met bewyse ten opsigte van verandering van seksuele gedrag onder adolossente en die invloed van godsdiens op adolossente seksualiteit. Die doelwit van hierdie navorsing was om die doeltreffendheid en funksionering van die program te evalueer, 'n optimale praktiese model te ontwikkel en aanbevelings vir die gebruik van die program aan 'n wyer sirkel van kerke te maak. METODES Uitkomskartering is gebruik om 'n benadering tot die ontwerp, waarneming en evaluering van die program te integreer. Alle veranderinge in projekvennote, sleutelprojekstrategieë en organisatoriese handelinge is waargeneem. Projekvennote is gedefinieër as portuurgroepopvoeders, fasiliteerders, jongmense, leraars en ouers. 'n Diepgaande begrip van watter aspekte van die program gewerk het, is bewerkstellig. Die evaluasie was ontwerp as 'n prospektiewe bykans-eksperimentele studie wat nie-lukraak gekose intervensiegroepe en kontrolegroepe vergelyk het. Daar was1352 deelnemers by aanvang, 176 afgepaarde vraelyste is teruggestuur in die intervensiegroepe en 92 in die kontrolegroepe. Veranderings in houdings, kennis en seksuele gedrag wat gerapporteer is, is tussen die twee groepe vergelyk. RESULTATE Die hooffaktore wat tot die sukses van die program gelei het, was: 'n goed ontwikkelde kurrikulum en program, effektiewe opleidingskampe, ondersteuning aan portuurgroepopvoeders deur die fasiliteerders, deurlopende raadgewing en opleiding, portuurgroepopvoeders as rolmodelle, 'n deelnemende styl van opvoeding en positiewe groepsdruk binne 'n sterk kerkgebaseerde sosiale netwerk. Die uitdaging van die kerk se negatiewe houding teenoor kondome was ook belangrik. Die swakste areas van die program was onder die leraars en ouers en in die uitdaging van media boodskappe en norme aangaande geslagskwessies. Die evaluering van die projekimpak het betekenisvolle verskille op grondslag tussen geslagte in terme van seksuele geloof en gedrag getoon. Daar was geen betekenisvolle impak van godsienstigheid op seksuele aktiwiteit nie. Die program was wel suksesvol in die toename van kondoomgebruik (p=0.02) en verhoging in ouderdom van eerste seksuele optrede (p =0.04), maar het geen impak in toename van geheelonthouding onder dié wie alreeds seksueel aktief is (p=0.25) of op die aantal seksmaats (p=0.67) gewys nie. GEVOLGTREKKING Implementering: Die program moet eerder as 'n jeug-ontwikkelingsprogram, as 'n HIV-voorkomingsprogram bemark word. Kerke in gemeenskappe met die hoogste HIV-koers moet voorkeur geniet. Die teikengroep moet jonger tieners insluit. Portuurgroepopvoeders moet deur portuurgroepe self aangewys word en nie deur volwassenes nie. Strategieë: Die strategieë van opleidingskampe en kwartaalikse byeenkomste is effektief, maar nuwe strategieë word benodig om 'n impak op ouers te maak. Inhoud: Die program behoort self-doeltreffendheid onder die jeug te bou, 'n kritiese bewustheid oor seksuele gesondheid te ontwikkel, eerder positiewe as vrees-gebaseerde boodskappe aan te bied, seksuele dwang en oorreding aan te spreek, die verband tussen kondoomgebruik en vertroue te verken, intergenerasie-seks aan te spreek en gemeenskapsuitreik- en aanbevelingsprogramme te bevorder. Die program is effektief en voldoen aan die verlangde bewyse ten einde aangewend te kan word.Met sy geskatte lidmaatskap van twee miljoen behoort die Anglikaanse Kerk dit aan te wend en kan dit ook vir ander denominasies aangepas word.

Thesis (MTech (Nursing))--Cape Peninsula University of Technology, 2018
Health risks are continuing to be a challenge worldwide. Globally, young people aged 15-24 are amongst the most vulnerable groups. It was revealed that between 2007 and 2010, the rate of HIV infection increased in this age group. In sub-Saharan Africa, three out of four new HIV infections are amongst girls aged 15 to 19 years of age. Young women aged 15 to 24 are twice more likely to live with HIV than men in 2019. South Africa is the country with the largest human immunodeficiency virus (HIV) infected population in the world, with an estimated 7 million people living with HIV and 380 000 new HIV infections in 2015. University students are a very important group of young people because they are being prepared for the world of work and to assume leadership roles. However, they are the group most exposed to a range of health risks, particularly regarding sexuality and HIV/AIDS. The aim of this study was to explore potential health risk factors amongst students at a Higher Education Institution (HEI) in the Western Cape with regard to sexuality and HIV/AIDS. The objectives of the study were to explore the factors that may increase health risk behaviours amongst students at an HEI and to discover and describe the knowledge university students have regarding potential health risks related to sexuality and HIV/AIDS. A qualitative research design was employed. Focus group interviews were done to collect data and a thematic content analysis was employed to analyse the data. Results revealed that the university students engaged in high-risk sexual behaviours, such as transactional sex, casual sex, multiple partner sexual relationships and unprotected sex. Such behaviours lead to a high-risk of contracting STIs and HIV/AIDS. Among the factors that were found to be contributing to these risky behaviours, was the new-found freedom of being away from the supervision of parents. Peer pressure at HEIs, as well as abuse of alcohol and drugs, also contribute to risky behaviours. Recommendations were that there should be organised and measured approaches to expose both lecturers and the students to HIV/AIDS education through an integrated curriculum design. There should be teamwork amongst lecturers, support staff and students to create powerful discussions and an exchange of ideas to clarify issues regarding HIV/AIDS, sexuality and other related topics to reduce high-risk behaviours and promote solid constructive attitudes amongst the university community.