The relationship between the incidence of medullated fibres in mohair and live weight over the lifetime of Angora goats

The presence of even a small amount of medullated fibre, in otherwise high quality mohair, may have a pronounced adverse effect on its value and end-use potential. However, there is considerable confusion about the effects, if any, of environmental variables and management upon the incidence of medullated fibres in mohair. This study examined how the incidence of medullated fibres (Med, % by number) is related to the fleece-free live weight (FFLwt) of Angora goats of different genetic origins over their lifetime, and how the relationship varies with other lifetime factors. Measurements were made over 11 shearing periods of 6 months, on a population of Angora goats representing the current range and diversity of genetic origins in Australia, including South African, Texan and interbred admixtures of these and Australian sources. Records of breed, sire, dam, date of birth, dam age, birth weight, birth parity, weaning weight, live weight, fleece growth and fleece quality were taken for castrated males (wethers) (n = 94 animals). A restricted maximum likelihood (REML) model was developed for log10(Med + 1), which allowed the observations of the same animal at different ages to be correlated in an unstructured manner. Med varied between 0.1% and 4.3%. The median average FFLwt during a shearing interval increased from 15 kg at 1 year old to 59 kg at 6 years old. Generally, within each shearing interval, Med increased with increasing average FFLwt. However, the size and shape of the relationship differed greatly between shearing ages. For example, at 3.5 years of age Med increased from about 1.1% at an average FFLwt of 26 kg to 2.6% at 50 kg, whilst at 5.0 years of age Med only changed from 1.4% at 32 kg to 1.6% at 56 kg. Goats with mixed genetic parentage showed an increase in Med at some shearings, particularly at younger ages. Variation in animal nutrition, as measured by live weight change during shearing periods, did not affect Med. The results supplement our earlier findings that mohair mean fibre diameter and clean mohair fleece weight, but not staple length, are greater in larger Angora goats. Live weight needs to be taken into account in genetic evaluation of the incidence of medullated fibres. We conclude that any advantage in handling fewer but larger Angora goats rather than more but smaller goats will come at the detriment of producing lower quality mohair, both in terms of increased Med and mean fibre diameter.

Role of shot length in characterizing tempo and dramatic story sections in motion pictures

Motivated by existing cinematic conventions known as film grammar, we proposed a computational approach to determine tempo as a high-level movie content descriptor as well as means for deriving dramatic story sections and events occurring in movies. Movie tempo is extracted from two easily computed aspects in our approach: shot length and motion. Story sections and events are generally associated with changes in tempo, and are thus identified by edges located in the tempo function. In this paper, we analyze our initial founding of the tempo function on the basis that the distribution of both shot length and motion in movies is normal. Given that the distribution of shot length is approximately Weibull as confirmed in our experiments, we examine the impact of modelling and modifying the contributions of shot length to tempo. We derive an appropriate normalization function that faithfully encapsulates the role of shot length in tempo perception, and analyze the changes to the story sections identified in films.

Futures in education

Futures education (FE) in a rapidly changing world is critical if young people are to be empowered to be proactive rather than reactive about the future. Research into young people's images and ideas of the future lead to the disturbing conclusion that, for many, the future is a depressing and fearful place where they feel hopeless and disempowered. On the other hand, as Richard Slaughter writes, 'young people are passionately interested in their own futures, and that of the society in which they live. They universally 'jump at the chance to study something with such intrinsic interest that also intersects with their own life interests in so many ways'. FE explicitly attempts to build on this interest and counter these fears by offering a profound and empowering set of learning strategies and ideas that can help people think and act critically and creatively about the future, without necessarily trying to predict it. Futures educators have, over the past decades, developed useful tools, ideas and a language for use with students of all ages to enable them to develop foresight literacy. Most of us tend to view the future as somehow beyond the present and rarely consider how decisions and choices made today profoundly affect not just one fixed future but any number of futures. The underlying goal of FE is to move from the idea of a single, pre-determined future to that of many possible futures, so that students begin to see that they can determine the future, that they need not be reactive and that they are not powerless. How does one do that? Ideas include, but are not limited to: timelines and Y-diagrams, futures wheels and mind maps, and 'Preferable, possible and probable' futures - a.k.a. the 3Ps. Current Australian curricula present education about the future in various implicit or explicit guises. A plethora of statements and curriculum outcomes mention the future, but essentially take 'it' for granted, and are uninformed by FE literature, language, ideas or tools. Science, the humanities and technology tend to be the main areas where such an implicit futures focus can be found. It also appears in documents about vocational education, civics and lifelong learning. Explicit FE is, as Beare and Slaughter put it, still the missing dimension in education. Explicit FE attempts to develop futures literacy, and draws widely upon futures studies literature for processes and content. FE provides such a wide range of ideas and tools that it can be incorporated into education in any number of ways. Programs in two very different schools, one primary and one secondary, are described in this article to provide examples of some of these ways. The first school, Kimberley Park State Primary School in Brisbane, operates with multi-age classrooms based on a 'thinking curriculum' developed around four organisers: change, perspectives, interconnectedness and sustainability. The second school, St John's Grammar School in Adelaide, is an independent school where FE operates as an integrated approach in Year Seven, as a separate one-semester subject in Year Nine and in separate subjects at other levels. Teachers both at Kimberley Park and St John's are very positive about FE. They say it promotes valuable and authentic learning, assists students to realise they have choices that matter and helps them see that the future need not be all doom and gloom. Because students are interested in the Big Questions, as one teacher put it, FE provides a perfect opportunity to address them, and to consider values that are fundamental for them and the future of the planet. Like any innovation, the long-term success of FE in schools depends on an embedding process so that the innovation does not depend on the enthusiasm and energy of a few individuals, only to disappear when they move on. It requires strong leadership, teacher knowledge, support and enthusiasm, and the support and understanding of the wider school community.

Sex-specific developmental plasticity in response to yolk corticosterone in an oviparous lizard

Corticosterone exposure during prenatal development as a result of maternal upregulation of circulating hormone levels has been shown to have effects on offspring development in mammals. Corticosterone has also been documented in egg yolk in oviparous vertebrates, but the extent to which this influences phenotypic development is less studied. We show that maternal corticosterone is transferred to egg yolk in an oviparous lizard (the mallee dragon, Ctenophorus fordi Storr), with significant variation among clutches in hormone levels. Experimental elevation of yolk corticosterone did not affect hatching success, incubation period or offspring sex ratio. However, corticosterone did have a sex-specific effect on skeletal growth during embryonic development. Male embryos exposed to relatively high levels of corticosterone were smaller on average than control males at hatching whereas females from hormone-treated eggs were larger on average than control females. The data thus suggest that males are not just more sensitive to the detrimental effects of corticosterone but rather that the sexes may have opposite responses to corticosterone during development. Positive selection on body size at hatching for both sexes in this species further suggests that increased corticosterone in egg yolk may have sex-specific fitness consequences, with potential implications for sex allocation and the evolution of hormone-mediated maternal effects.

Ecology and conservation of insectivorous bats in rural landscapes

Throughout the world, the increasing use of land for agriculture has been associated with extensive loss and fragmentation of natural habitats and, frequently, the degradation of remaining habitats. The effects of such habitat changes have been well studied for some faunal groups, but little is known of their consequences for bats. The aim of this study was to investigate the ecology and conservation of an assemblage of insectivorous bats in a rural landscape, with particular focus on their foraging and roosting requirements. This increased knowledge will, hopefully, assist the formulation of policy and management decisions to ensure the long-term survival of bats in these altered environments. The distribution and abundance of insectivorous bats in the Northern Plains of Victoria was investigated to determine the impacts of land-use change and to identify factors influencing the distribution of bats in rural landscapes. Thirteen species of insectivorous bats were recorded across the region by sampling at 184 sites. Two species were rare, but the remaining 11 species were widespread and occurred in all types of remnant wooded vegetation, ranging from large blocks (≥200 ha) to small isolated remnants (≤5 ha) and scattered trees in cleared farm paddocks. There was no significant difference between remnant types in the relative abundance of bat species, in species richness, or in the composition of bat assemblages at study sites. In a subsequent study, no difference in the activity levels of bats was found between remnants with different tree densities, ranging from densely-vegetated blocks to single paddock trees. However, sites in open paddocks devoid of trees differed significantly from all types of wooded remnants and had significantly lower levels of bat activity and a different species composition. In highly cleared and modified landscapes, all native vegetation has value to bats, even the smallest remnant, roadside and single paddock tree. Roost sites are a key habitat requirement for bats and may be a limiting resource in highly modified environments. Two species, the lesser long-eared bat Nyctophilus geoffroyi and Gould's wattled bat Chalinolobus gouldii, were investigated as a basis for understanding the capacity of bats to survive in agricultural landscapes. These species have different wing morphologies, which may be influential in how they use the landscape, and anecdotal evidence suggested differences in their roosting ecology. Roosting ecology was examined using radio-tracking to locate 376 roosts in two study areas with contrasting tree cover in northern Victoria. Both species were highly selective in the location of their roosts in the landscape, in roost-site selection and in roosting behaviour, and responded differently to differing levels of availability of roosts. The Barmah-Picola study area incorporated remnant vegetation in farmland and an adjacent extensive floodplain forest (Barmah forest). Male N. geojfroyi roosted predominantly within 3 km of their foraging areas in remnants in farmland. However, most female N. geoffroyi, and both sexes of C. gouldii, roosted in Barmah forest up to 12 km from their foraging areas in farmland remnants. These distances were greater than previously recorded for these species and further than predicted by wing morphology. In contrast, in the second study area (Naring) where only small remnants of wooded vegetation remain in farmland, individuals of both species moved significantly shorter distances between roost sites and foraging areas. There were marked inter- and intra-specific differences in the roosts selected. C. gouldii used similar types of roosts in both areas - predominantly dead spouts in large, live trees. N. geoffroyi used a broader range of roost types, especially in the farmland environment. Roosts were typically under bark and in fissures, with males in particular also using anthropogenic structures. A strong preference was shown by both sexes for roosts in dead trees, and entrance dimensions of roosts were consistently narrow (2.5 cm). In Barmah forest, maternity roosts used by N. geoffroyi were predominantly in narrow fissures in large-diameter, dead trees, while at Naring maternity roosts were also found under bark, in buildings, and in small-diameter, live and dead trees. The number of roost trees that are required for an individual or colony is influenced by the frequency with which bats move between roosts, the proportion of roosts that are re-used, the distance between consecutive roosts, and the size of roosting colonies. Both species roosted in small colonies and regularly shifted roost sites within a discrete roost area. These behavioural traits suggest that a high density of roost sites is required. There were marked differences in these aspects of behaviour between individuals roosting in Barmah forest and in the fragmented rural landscape. At Naring, N. geqffroyi remained in roosts for longer periods and moved greater distances between consecutive roosts than in Barmah forest. In contrast, C. gouldii used a smaller pool of roosts in the farmland environment by re-using roosts more frequently. Within Barmah forest, there is an extensive area of forest but the density of hollow-bearing trees is reduced due to timber harvesting and silvicultural practices. Individuals were selective in the location of their roosting areas, with both species selecting parts of the forest that contained higher densities of their preferred roost trees than was generally available in the forest. In contrast, in farmland at Naring, where there were small pockets of remnant vegetation with high densities of potential roost sites surrounded by cleared paddocks with few roosting opportunities, little selection was shown. This suggests that in Barmah forest the density of trees with potential roosts is lower than optimal, while in farmland roosting resources may be adequate in woodland remnants, but limiting at the landscape scale since more than 95% of the landscape now provides no roosting opportunities. Insectivorous bats appear to be less severely affected than some other faunal groups by habitat fragmentation and land-use change. A highly developed capacity for flight, the spatial scale at which they move and their ability to cross open areas means that they can regularly move among multiple landscape elements, rather than depend on single remnants for all their resources. In addition, bats forage and roost mainly at elevated levels in trees and so are less sensitive to degradation of wooded habitats at ground level. Although seemingly resilient to habitat fragmentation, insectivorous bats are fundamentally dependent on trees for roosting and foraging, and so are vulnerable to habitat loss and ongoing rural tree decline. Protection of the remaining large old trees and measures to ensure regeneration to provide ongoing replacement of hollow-bearing trees through time are critical to ensure the long-term conservation of bats in rural landscapes.

Distance, dialogue and difference : a postpositive approach to understanding distance education in Papua New Guinia

This study focuses on the experiences of a group of educators engaged in a professional development program by distance education in Papua New Guinea. The participants in this study have been keeping professional journals, for periods of up to three years, about their experiences of distance education. Their discourses have been used to form a ‘connected group’ of research participants, who use an action framework to focus on problematic issues surrounding distance education in Papua New Guinea. It is a piece of research, framed by critical theory, and characterised by participation, collaboration, reflexivity, reciprocity and empowerment. The process of the study is based in dialogue, and takes the view that research is constituted of a transformative perspective, which alters the way research participants understand the multiple realities in which they live and work, arid ultimately results in improvements in their lived experiences. The nature of the methodology privileges Voice' and a discourse of difference from each participant which contributes to the problematic nature of the study. The study has concerned itself, increasingly, with issues of power and control in the research process, and this has resulted in significant changes in the research as participants have become more conscious of issues such as distance, dialogue and difference. The study has evolved over a period of time in significant ways, and evidence is available that teachers in Papua New Guinea, despite structural and pedagogical barriers, are critically reflective and are able to transform their practice in ways which are consistent with social, cultural and political contexts in which they live and work. A number of 'local1 theories about research and distance education in Papua New Guinea are developed by the participants as they become informed about issues during the research. The practice of distance education and professional development, at personal and institutional levels, undergoes reconstruction during the life of the research and the study 'signals' other ways in which distance education and professional development may be reconstructed in Papua New Guinea.

Rethinking the spatiality of literacy practices in multicultural conditions

Moving beyond the limitations of the ‘space-as-container’ ontology (Gotham, 2003), this paper offers Bakhtinian (dialogical) perspective on the use of cultural-semiotic spaces, in particular with regard to the production of new transcultural meanings and hybrid literacy practices as a result of interaction between differences. From this perspective cultural-semiotic space is not a neutral backdrop against which literacy practices unfold, but rather it is in the constant process of change due to the struggle between centrifugal and centripetal forces that operate on the level of spatial and textual politics – that is, between the processes of cultural and textual uniformization and local fragmentation. Given the dialogical nature of space and its relations to cultural identities of migrant and minority students and their literacy practices, the paper argues for rethinking literacy studies in multicultural conditions. This task becomes more urgent in the current educational era of standards, accountability and classroom pedagogies that are not attuned to the particularities of students’ intertextual practices and emergent transcultural places in which they live.

Programs to improve interpersonal safety in Indigenous communities: evidence and issues

There is now a substantial amount of published literature describing the range of programs and interventions that have been implemented in an attempt to improve aspects of community safety. Only a small body of this work, however, has examined the outcomes of those programs delivered to Indigenous Australians or, indeed, the communities in which they live. This Issues paper provides an overview of those programs that were identified in a systematic search of relevant research databases. 

Barriers to avoiding fast-food consumption in an environment supportive of unhealthy eating

Objective
To investigate factors (ability, motivation and the environment) that act as barriers to limiting fast-food consumption in women who live in an environment that is supportive of poor eating habits.

Design
Cross-sectional study using self-reports of individual-level data and objectively measured environmental data. Multilevel logistic regression was used to assess factors associated with frequency of fast-food consumption.

Setting
Socio-economically disadvantaged areas in metropolitan Melbourne, Australia.

Subjects
Women (n 932) from thirty-two socio-economically disadvantaged neighbourhoods living within 3 km of six or more fast-food restaurants. Women were randomly sampled in 2007–2008 as part of baseline data collection for the Resilience for Eating and Activity Despite Inequality (READI) study.

Results
Consuming low amounts of fast food was less likely in women with lower perceived ability to shop for and cook healthy foods, lower frequency of family dining, lower family support for healthy eating, more women acquaintances who eat fast food regularly and who lived further from the nearest supermarket. When modelled with the other significant factors, a lower perceived shopping ability, mid levels of family support and living further from the nearest supermarket remained significant. Among those who did not perceive fruits and vegetables to be of high quality, less frequent fast-food consumption was further reduced for those with the lowest confidence in their shopping ability.

Conclusions
Interventions designed to improve women's ability and opportunities to shop for healthy foods may be of value in making those who live in high-risk environments better able to eat healthily.

Factors affecting breeding success in Peregrine Falcons (Falco peregrinus macropus) across Victoria 1991 - 2012

Peregrine Falcon’s lifetime reproductive outputs are influenced more by the quality of the nest site than by the environmental landscape in which they live. The installation of a nest boxes significantly improves breeding outcomes. Uniquely, Victorian Peregrines use novel (non-cliff) nest sites and disperse considerably shorter distances to adopt these sites.

David Bowie: dancing with madness and proselytising the socio-political in art and life

A longstanding, successful and frequently controversial career spanning more than four decades establishes David Bowie as charged with individual agency. The notion of ‘agency’ here refers particularly to the ‘ability of people, individually and collectively to influence their own lives and the society in which they live’ (Germov and Poole, 2007: 7). That Bowie has influenced many lives is undeniable to his fans. He has long demonstrated an avid curiosity for the enduring patterns of social life which is reflected in his art. Bowie’s opus contains the elements of ideological narratives around sexual (mis)adventure, expressivity, and; resistance to ‘normative’ behaviour. He requisitions his audiences, through frequently indirect lyrics and images, to critically question sanity, identity and essentially what it means to be ‘us’ and why we are here. Here, in this context, ‘dancing with madness’ assumes an intimate relationship, even if brief, where ideas and emotions come passionately together for the purpose of creative expression much like the intertwining and energetic performance of the partner dance Tango. As such, ‘dancing’ is argued here to be an appropriate descriptor for how Bowie has engaged with creative cultural forms but not meant to be self-conscious nor indicate superficiality or ignorance. The idea of madness for its part is a theme in many of his compositions, for example the original album cover for The Man Who Sold the World (1971)  depicts an asylum and includes the song ‘All The Madmen’ and Aladdin Sane (1973)—a lad insane--are but two examples. This paper argues that Bowie’s frequently astute contemplations, manifest through his art over a period now spanning more than forty years, continues to draw fans of like mind to his work with the result that he has a legitimate claim to influence and affect.

Tests of ecogeographical relationships in a non-native species: what rules avian morphology?

The capacity of non-native species to undergo rapid adaptive change provides opportunities to research contemporary evolution through natural experiments. This capacity is particularly true when considering ecogeographical rules, to which non-native species have been shown to conform within relatively short periods of time. Ecogeographical rules explain predictable spatial patterns of morphology, physiology, life history and behaviour. We tested whether Australian populations of non-native starling, Sturnus vulgaris, introduced to the country approximately 150 years ago, exhibited predicted environmental clines in body size, appendage size and heart size (Bergmann's, Allen's and Hesse's rules, respectively). Adult starlings (n = 411) were collected from 28 localities from across eastern Australia from 2011 to 2012. Linear models were constructed to examine the relationships between morphology and local environment. Patterns of variation in body mass and bill surface area were consistent with Bergmann's and Allen's rules, respectively (small body size and larger bill size in warmer climates), with maximum summer temperature being a strongly weighted predictor of both variables. In the only intraspecific test of Hesse's rule in birds to date, we found no evidence to support the idea that relative heart size will be larger in individuals which live in colder climates. Our study does provide evidence that maximum temperature is a strong driver of morphological adaptation for starlings in Australia. The changes in morphology presented here demonstrate the potential for avian species to make rapid adaptive changes in relation to a changing climate to ameliorate the effects of heat stress.

Behavioural determinants of the obesity epidemic

Obesity is a serious and growing public health problem affecting developed and developing countries. It is generally agreed that the causes of the current obesity epidemic are not genetic in origin, but are the result of changes in the environments in which we live. While acknowledging the importance of environmental factors, the central role of behaviour in the obesity epidemic cannot be ignored. It is our eating, physical activity and sedentary behaviours that form the interface between our biology and the environments to which we are exposed. However, a lack of understanding of the specific behaviours that are important in the aetiology of obesity poses a major constraint to preventing obesity. A better understanding of the behaviours that contribute to weight gain and obesity is critical in order to plan and implement effective obesity prevention initiatives.Theory-driven investigations of eating, physical activity and sedentary behaviours, their determinants, and their role in weight gain and obesity among different population groups are urgent research priorities. Without an understanding of the key behaviours that contribute to weight gain, and the influences on these behaviours, it will remain difficult to identify where to intervene in the environment and be confident that action will prevent obesity.

What's instinct got to do with it? A blueprint for a coherent approach to punishing criminals

As a result of the instinctive synthesis approach to sentencing, decisions are often based on the intuitive inclinations and sentiments of sentencers, as opposed to binding rules and principles. In particular, insufficient regard is paid to the purposes and objectives that can be achieved through a state-imposed system of punishment. Momentum is gathering for the High Court to revisit the manner in which the sentencing inquiry is undertaken. We believe that the court should use the opportunity to implement fundamental reform in sentencing and direct the sentencing process down a more transparent and forensic path. We suggest that there are seven basic steps that need to be undertaken to achieve enlightened sentencing reform. Ideally this is a role for the legislature. However, given the populist climate in which we live we have little confidence that the legislature will undertake such an exacting task – one which would almost certainly lead to a less severe sentencing regime. The judiciary offers the strongest hope that at least some of these steps will be taken. This article offers a blueprint for how such reform can be implemented. The first step is simply to assume that the institution of state-imposed punishment is justified – this has already been undertaken. The second is to select the theory which best justifies punishing wrongdoers. Thirdly, public opinion must be ignored in developing sentencing principle. Next it must be determined which objectives (such as deterrence and rehabilitation) can be achieved through sentencing. The fifth step involves matching the punishment to the crime. Step six is to critically analyse the foundation, and reassess the relevance, of the hundreds of aggravating and mitigating considerations that presently affect the sentencing calculus. Finally, sentencing law and practice should be subject to ongoing reform to take into account emerging empirical evidence concerning the positive benefits that can be achieved through sentencing.

Floating lives : cultural citizenship and the limits of diaspora

Cultural citizenship may, in the simplest terms, be taken to mean a certain 'fit' or compatibility between the cultural attributes of an individual or group and those of the society in which they live. It is a complex concept, taking in rights, responsibilities and competencies as well as the more intangible issues of identity and belonging which have been the subject of intense debates within cultural studies in the last decade. In the case of diasporic or transnational peoples, it is further complicated by the fact of their multiple and unstable cultural and/or civic allegiances (to home and host nations in the first instance, but frequently also to the cultural space of diaspora itself).

This essay examines recent life stories by Chinese Australians: Clara Law's film Floating Life (1996) and two novellas by Liu Guande and Huangfu Jun, published together in English under the title Bitter Peaches and Plums (1995). Focusing on the diversity of experience evoked by notions of cultural belonging, it argues against the prevalent tendency within diaspora studies to engage in a rhetoric of cultural essentialism. The literatures of diaspora deserve to be read as documents of unique and complex cultural experiences rather than mere illustrations of archetypes