Differential rates of offspring provisioning in Gould’s petrels: are better feeders better breeders?

Procellariiformes (albatrosses and petrels) must accumulate substantial energy reserves to sustain them while incubating their single egg. They then produce a chick that is often more than 130% of their own body mass. Thus, despite the variable nature of resource availability in the marine environment, successful reproduction requires a considerable increase in foraging rates. Birds that are better foragers are, therefore, likely to be better parents. As surrogates of foraging ability, we assessed two parental traits that are separated temporally over the breeding season, body condition during incubation and provisioning performance, in Gould’s petrel (Pterodroma leucoptera). Although parental condition did not influence hatching success, we found significant positive correlations between the average body condition of a breeding pair and both the growth rate of chicks (g day^–1) and the body condition of chicks at peak mass. Provisioning rate also correlated positively with chick condition. Chick condition was positively correlated with haemoglobin concentration [Hb] at peak mass, which was positively correlated with [Hb] at fledging. Because the probability of survival after fledging may be influenced by chick body condition and [Hb], the ability of parents to acquire additional resources for breeding is likely to be an important determinant of reproductive success.

Susceptibility of reproduction in female pigs to impairment by stress or elevation of cortisol

It is generally agreed that stress can impair reproduction. Furthermore, it is often thought that cortisol, which is secreted during stress as a result of activation of the hypothalamo-pituitary adrenal axis, is associated with this stress-induced impairment of reproduction. It has been hypothesized that reproduction in females is particularly susceptible to disruption by acute stress during the series of endocrine events that induce estrus and ovulation. Nevertheless, we found no support for this conjecture when we subjected female pigs to repeated acute stress or repeated acute elevation of cortisol during the period leading up to estrus and ovulation. Conversely, studies have demonstrated that prolonged stress and sustained elevation of cortisol can disrupt reproductive processes in female pigs. Nevertheless, in each study that demonstrated this effect, there were some animals subjected to the prolonged stressor or the sustained elevation of cortisol in which the reproductive parameters that were measured were not affected by the treatment. We propose that reproduction in female pigs is resistant to the effects of acute or repeated acute stress or acute or repeated acute elevation of cortisol even if these occur during the series of endocrine events that induce estrus and ovulation. Furthermore, while reproductive processes in some individuals are compromised, reproduction in a proportion of female pigs appears to be resistant to the effects of prolonged stress or sustained elevation of cortisol.

Arts curriculum reform : social and cultural reproduction in Victorian schools

This thesis examines the implementation of the government educational policy document The Curriculum and Standards Framework. I examined the historical and political motivation behind the development of this document and how it introduced a pervasive new initiative of outcomes based education and accountability based on economic rationalism. In particular I examined the implications this new approach had for visual arts education and the subsequent changes to the arts curriculum. This has entailed the introduction of the aesthetic appreciation of the arts as an outcome of the CSF: The Arts. I applied Bourdieu's theory of cultural reproduction in education which draws predominantly on a Weberian view and a theory of practice. Bourdieu discusses differential educational achievement according to cultural capital stating education requires certain forms of cultural capital that are not equally distributed among the classes. This therefore impedes or enhances life chances according to social class i.e. educational qualifications become a commodity in the labour market and other social fields. I examined how aesthetic appreciation of the arts has evolved historically as a form of social distinction. This entails an abstract element of arts discourse, which demands a certain linguistic competence, and familiarisation, which Bourdieu claims, is developed in the family, as 'cultural capital' this is further perpetuated in schools. The likely outcome is that the introduction of aesthetic appreciation in arts education i.e the demand to 'write about' and 'talk about' art, will perpetuate class inequality due to social and cultural difference. The study has been to examine the practices of arts education in four schools and the extent to which aesthetic appreciation was implemented in the visual arts. Data was collected by case study methods of observation, questionnaire and interview and was interpretive in both quantitative and qualitative methods. I analysed the data based on class differentiation by socioeconomic divisions and examined the school ethos and attitude towards the Arts along with differentiation in cultural capital between student population. I also found teacher and student habitus played a vital role in the implementation of the CSF. This is because habitus can cause resistance to change due to the division between the formulation of the curriculum in the bureaucratic order and the practice of teachers in classrooms. My thesis interprets education as a form of social reproduction, perpetuating the existing social order. However, as Bourdieu asserts and I agree education is a form of symbolic power as it conceals its social function under the guise of neutrality and the technical functional premise. Therefore, this thesis aims to make transparent how the education system serves the interests of the dominant group through curriculum policy. Consequently, it becomes clear how education has far reaching social implications where the distinctions of class are perpetuated through cultural reproduction.

Asexual reproduction does not produce clonal populations of the brooding coral Pocillopora damicornis on the Great Barrier Reef, Australia

We have investigated the relationship between genotypic diversity, the mode of production of brooded larvae and disturbance in a range of reef habitats, in order to resolve the disparity between the reproductive mode and population structure reported for the brooding coral Pocillopora damicornis. Within 14 sites across six habitats, the ratio of the observed (G o) to the expected (G e) genotypic diversity ranged from 69 to 100% of that expected for random mating. At three other sites in two habitats the G o /G e ranged from 35 to 53%. Two of these sites were recently bleached, suggesting that asexual recruitment may be favoured after disturbance. Nevertheless, our data suggest that brooded larvae, from each of five habitats surveyed, were asexually produced. While clonal recruitment may be important in disturbed habitats, the lack of clonality detected, both in this and earlier surveys of 40 other sites, implies that a disturbance is normally insufficient to explain this species’ continued investment in clonal reproduction.

Do reproductive tactics vary with habitat heterogeneity in the intertidal sea anemone Actinia tenebrosa?

Cnidarians display a diverse range of reproductive tactics including sexual and asexual modes of reproduction. Although few studies have looked for intraspecific variation in reproductive tactics, flexible expression of such life-history traits may be favoured in species that occupy a range of habitats. We tested this in the sea anemone Actinia tenebrosa by comparing cycles of reproductive activity and the mode of production of brooded larvae in local populations occupying boulder fields and stable rock platforms. We determined the mode of production of broods from eight rock platforms (separated by up to 1600 km) and two boulder shores on the south east coast of Australia using a combination of allozyme data and four newly characterised microsatellite markers.

We determined seasonal patterns of brooding and gonad development by monthly dissection of 15–30 adults from each of two boulder fields and two stable platforms. Previous genetic studies have shown that populations of A. tenebrosa on rock platforms can be highly clonal, whereas anemones on more heterogeneous boulder habitats display levels of genotypic diversity similar to that expected for sexual reproduction. We genotyped a total of 221 juveniles from 37 brooding adults including 11 broods and 80 juveniles from boulder shores. We did not detect any evidence of sexual production of broods. All brooded juveniles displayed identical multi-locus genotypes to their brood parent irrespective of habitat of origin or location, including 28 broods (200 juveniles) that were heterozygous at one or more locus. Similarly, we found that temporal patterns of gonad formation and brooding were consistent across habitats and locations. We detected 346 mature males, 234 non-reproductive or immature individuals, and no mature females within a total of 580 dissected individuals. These data suggest that the reproductive tactics of A. tenebrosa are essentially fixed and that variation in the genotypic diversity of populations may reflect variation in factors such as the input of sexually derived planktonically dispersed recruits or post-settlement processes. However, the apparent lack of females paradoxically implies that sexual reproduction, and hence recruitment, must be rare or no longer possible within some populations, and highlights the need for long-term studies of these populations.

Age, growth and reproduction of deepwater dogfishes from southeastern Australia

The productivity of six deepwater dogfishes was investigated by examining their age, growth and reproductive biology. A new method of ageing was developed, and compared with existing techniques. Some species live greater than 50 years, and populations may not sustain commercial fisheries.

Biology and management of Murray cod reproduction within controlled environments

The emerging Murray cod aquaculture industry is currently restricted by a lack of consistent and year-round production of fingerlings. Biological information and reproductive technologies developed during this research have facilitated the development of indoor, environmentally-controlled breeding practices for this species, thereby enabling Murray cod juveniles to be produced on-demand.

Visual discrimination and reproduction of movement by individuals with an intellectual disability

This study investigates the capacity of individuals with an intellectual disability to make accurate discriminations of computer-generated displays and also to reproduce the characteristics of those displays. The findings suggest that the learning of everyday motor skills in this population may be hampered by difficulties in visually perceiving important characteristics of the demonstration. Procedures, employed for teaching these skills to intellectually disabled, are being reassessed in the light of these findings.

Technogyny : the transformation of reproduction

Explores the major social and political consequences of new reproductive and genetic technologies. Increasingly the experience and process of reproduction is dominated by technology and medicine. Suggests an international institution such as the UN is likely to be the most effective in addressing the concerns associated with the technologies' adverse effects. Such intervention is unlikely without active and sophisticated lobbying from women around the world.

Environmental education in Thailand : reproduction and reformation

This study was conducted to improve the pedagogy of a particular teacher education course and its teaching and learning activities. It was based on the principles of action research. Results indicate that through group process workshops and the action research projects the research and participants acquired skills in problem-solving and collaborative work.

Reproduction and social control : women in Australia 1900-1999

Examines the conditions of Australian women in their reproductive lives, in a social and scientific context throughout the twentieth century. Aims to identify those areas which have influenced change (if it has occurred), the types of change and the impact those changes have had on the lives of women, given the premise that the social life of women, in all its forms, is predicated by their reproductive function.

Reproduction, resistance and transformation at Marantha High School

The focus of this thesis is the attempt by the Seventh-day Adventist Church to reproduce SDA culture in students attending one of its schools, Maranatha High School. As a 'critical ethnography', it adopts a theoretical perspective from critical social theory to examine problems associated with this attempt. These problems are reflected in data gathered by a range of ethnographic techniques. The study first portrays the socio-political dynamics underlying the historical creation of Adventist culture generally, its embodiment in institutional forms, and the development of a substantial educational structure intended to transmit that culture to succeeding generations.

The study then focuses on current SDA educational philosophy, and the assumptions underlying the principles of selection, organisation, transmission and evaluation of knowledge considered to be valid. It then examines how Maranatha High School itself seeks to implement those principles. In this context, the study also reflects on the political implications of the modes of management and institutional control adopted at various levels of the organisation and in the school.

As a dialectical study, the thesis views the school as a social setting in which knowledgeable humans engage in communicative interaction. Rather than promoting smooth reproduction, the school is portrayed as a site of struggle, negotiation and potential transformation as participants resist forces that they perceive to be constraining and oppressing them. Consequently the thesis examines the perceptions of the various groups of participants, and the nature and impact of their interaction. In as much as teachers are official 'managers' of SDA culture and knowledge, this examination focuses especially on their personal definitions of the situation, the dilemmas that confront them from internal and external sources, the development of their own cultural forms in response, and the implications this action has for cultural reproduction and continuity.

Molecular studies of reproduction in Haliotis species

Haliotids are expensive seafood molluscs known as abalone. The research involved cloning and expression of genes involved with their reproduction, including some involved with female egg-laying. Genes characterised in this study were put into bacteria to make reproductive molecules which were then injected into abalone to induce spawning. The results provide important information towards abalone cultivation.