Sonia Graham

Extreme climatic events shape arid and semiarid ecosystems

6 Climatic changes associated with the El Nino Southern Oscillation (ENSO) can have a dramatic impact on ter- restrial ecosystems worldwide, but especially on arid and semiarid systems, where productivity is strongly lim- ited by precipitation. Nearly two decades of research, including both short-term experiments and long-term studies conducted on three continents, reveal that the initial, extraordinary increases in primary productivity percolate up through entire food webs, attenuating the relative importance of top-down control by predators, providing key resources that are stored to fuel future production, and altering disturbance regimes for months or years after ENSO conditions have passed. Moreover, the ecological changes associated with ENSO events have important implications for agroecosystems, ecosystem restoration, wildlife conservation, and the spread of disease. Here we present the main ideas and results of a recent symposium on the effects of ENSO in dry ecosystems, which was convened as part of the First Alexander von Humboldt International Conference on the El Nino Phenomenon and its Global Impact (Guayaquil, Ecuador, 16-20 May 2005).

Modelling the role of intracolonial genetic diversity on regulation of brood temperature in honey bee (Apis mellifera L.) colonies

Abstract.In polyandrous social insects such as honey bees, a worker’s affinity for a particular task may be genetically infl uenced and so some patrilines may have lower stimulus thresholds for commencing a task than others. We used simulation models to investigate the effects of intracolonial diversity in the task thresholds that stimulate workers to engage in heating and cooling during nest thermoregulation. First, we simulated colonies comprised of one or 15 patrilines that were engaged in heating the brood nest, and observed that single patriline colonies maintained, on average, less stable brood nest temperatures than multiple patriline colonies. Second we simulated colonies with five patrilines that were engaged in cooling their nest, recording the proportions of bees of different patrilines that engaged in nest cooling in response to changing temperatures. Both of our simulations show remarkably similar qualitative patterns to those that we have previously observed empirically. This provides further support for the hypothesis that geneticallybased variability in task thresholds among patrilines within honey bee colonies is an important contributor to the ability of colonies to precisely thermoregulate their nests, and we suggest that diversity is important for optimal expression of a range of other colony-level phenotypes.

Nurturing relationships: the gardens of Greek and Vietnamese migrants in Marrickville, Sydney.

Abstract First- and second-generation migrants represent about 40 per cent of the Australian population. With such a large and also diverse immigrant population, urban landscapes are significantly shaped by the gardens created by migrants. Two groups of Vietnamese and Greek migrants, in the inner suburb of Marrickville South in Sydney, were interviewed to examine the relationship between migration history and garden-making practices. Garden composition was influenced by migrants’ relationship with their homeland, in terms of length of time since migration, previous garden ownership, reason for migration and desire for cultural continuity, and by the size of the garden. Gardens also varied according to country of migration. The actual garden produce and type of environment created by the garden helped to emphasise and maintain cultural relationships, provide a space of nostalgia, and give a sense of ownership and control.

The relevance of a coproductive capacity framework to climate change adaptation: investigating the health and water sectors in Cambodia

The authors wish to gratefully acknowledge that the research this paper is based upon has been made possible through an AusAID Australian Development Research Awards (ADRA) grant (ADRA0800117) for the project entitled Evaluating the Connections and Contributions of Climate Change Vulnerability Assessments to Adaptation Strategies in the Health and Water Sectors: A Three-Country Study in the Asia-Pacific Region.

Three cooperative pathways to solving a collective weed management problem

The spread of pest plants is a trans-boundary problem that causes losses to biodiversity and disrupts ecosystems. Much social research into, and policy development for, weeds has conceptualised their control as a problem facing individual landowners, rather than as a collective action problem. In the case of serrated tussock (Nassella trichotoma), a highly invasive, noxious weed that is widespread in southeastern Australia, landowners and government staff are acutely aware that this weed is a communal problem. Analysis of semi-structured interviews revealed that landowners and agency staff believe there are three pathways available for communities to achieve greater weed control collectively. These involve sharing information, providing support and applying pressure. These pathways provide two options for future policy development. Firstly, future policies could use the findings to make minor adjustments to the way information is distributed, funding is provided and enforcement is administered. Alternatively, future policies could be refocused to acknowledge good farm management, encourage better relationships among neighbours and build on the social capital that exists in Landcare groups.

Temporalities in Adaptation to Sea-Level Rise

Local residents, businesspeople, and policymakers engaged in climate change adaptation often think differently of the time available for action. Their understandings of time, and their practices that invoke time, form the complex and sometimes conflicting temporalities of adaptation to environmental change. They link the conditions of the past to those of the present and the future in a variety of ways, and their contemporary practices rest on such linking explicitly or implicitly. Yet the temporal connections between the present and distant future of places are undertheorized and poorly considered in the science and policy of adaptation to environmental change. In this article we address this theoretical and practical challenge by weaving together arguments from social and environmental geography with evidence from small coastal communities in southeastern Australia. We show that the past conditions residents’ imagined futures and that these local, imagined futures are incongruent with scientific, popular, and policy accounts of the future. Thus we argue that the temporalities of adaptation include incommensurate and unacknowledged ways of knowing and that these affect adaptation practices. We propose that strategies devised by governments for adapting to environmental change need to make visible—and calibrate policies with—the diverse temporalities of adaptation. On this basis, the times between the present and the long-term future can be better navigated as a series of short and negotiated policy steps.

Towards fair local outcomes in adaptation to sea-level rise

Arguments that fairness should be a guiding principle of climate change adaptation have been primarily concerned with distributive and procedural aspects of fairness, with far less attention paid to the temporal, spatial and interactional dimensions of fairness. This paper presents the results of a study that sought to understand the multiple dimensions of fairness of adaptation strategies that exist or can be developed to deal with sea-level rise. The study focused on five small communities along the south-east coast of Australia—Lakes Entrance, Seaspray, Port Albert, McLoughlins Beach and Manns Beach. Interviews were conducted with residents of the local communities to examine perceptions of current adaptation policies and their social impacts. A questionnaire was used to develop a nuanced understanding of the types of people living in these communities and their everyday lives, practices, and relationships. This enabled us to identify a range of non-material social impacts that may occur as a result of sea-level rise. Finally, focus groups were used to obtain community perspectives on the fairness of a range of potential future adaptation strategies. Together, these methods revealed that adaptation to sea-level rise is likely to affect some groups in the community significantly more than others, and in ways that will fundamentally change the nature of living in these communities. Understanding nuances in the social values of communities reveals how policies can be adapted to provide fairer outcomes for all community members through processes that create the time and space required to establish long-term working relationships between communities and government.

How Local Landholder Groups Collectively Manage Weeds in South-Eastern Australia

For two decades researchers and policy makers have been arguing that community-based collective action is needed to effectively control weeds. Yet there has been little social research into the ways that collective weed control emerges at local scales. The aim of this paper is to investigate the mechanisms through which three local landholder groups in south-eastern Australia collectively manage weeds and the measures they use to evaluate success. Semi-structured interviews were conducted with members of three Landcare groups—Jerrawa Creek/Upper Lachlan, MacLaughlin River and Towamba Valley—as well as government staff external to the groups. The results reveal that for all three groups collective weed control is about supporting individual weed control efforts as well as proactively engaging landholders with the worst infestations. The groups were seen to be successful because they focused on the common challenge that weeds pose to all landholders, thereby removing the shame associated with having weeds, and because they organised community events that were as much about building and maintaining social relationships as improving weed control. Groups were positive about what they had achieved as collectives of landholders, but also saw an important role for government in providing funding, engaging with landholders who were unwilling to engage directly with the group, and controlling weeds on public lands.

Irrigators' attitudes towards environmental flows for wetlands in the Murrumbidgee, Australia.

In Australia and many countries worldwide environmental flows are becoming an increasingly popular tool for reducing the negative impacts of river regulation. However, there are many factors that restrict the effectiveness of these flows such as thermal pollution, existing physical infrastructure and the limited volume of water available. Since environmental flows result in reduced water allocations for irrigators, the aim of the present study was to investigate whether irrigators’ attitudes towards environmental flows for wetlands are influenced by the effectiveness of these flows. Three focus groups were used to engage with farmers in the Murrumbidgee Catchment, eastern Australia. A simulation model of the Murrumbidgee River was created to provide focus groups with a tool for examining the effectiveness of wetland-watering releases and exploring alternative management scenarios. The results showed that participants support the principle of environmental flows for wetlands. However, they believed that the flows could be more effective if the restrictions imposed by physical infrastructure were removed. They also suggested that the volume of translucency releases should be lowered, as these flows reduce the amount of water available for wetlands and lower early season allocations for general-security water users. The participants provided numerous suggestions for altering the management of water resources so that both the Mid Murrumbidgee Wetlands and farmers would benefit.

The Effects of Climate and Socio‐Demographics on Direct Household Carbon Dioxide Emissions in Australia

Household CO2 emissions are a significant contributor to global greenhouse gas emissions and consequently climate warming. Despite this, there has been little consideration of how household CO2 emissions may be affected by changes in climate. The aim of the present study has been to investigate the way climate, as well as socio-demographic characteristics, may affect household CO2 emissions produced from energy use. A national online survey was conducted to determine current household CO2 emissions in Australia as well as capture the ownership and use of household appliances and installations. Electricity and gas-based emissions as well as the ownership of a variety of household appliances and installations were found to be strongly associated with temperature. Electricity and gas emissions were found to decrease as annual average temperatures increase. However, as temperatures continue to rise under climate change this pattern may be reversed owing to increased reliance on air conditioners. One option for preventing this from occurring is to encourage houses to adopt more solar-passive installations. Although this may be expensive, households with higher emissions tend to have higher incomes, indicating that they may have the capacity to pay for such installations.