Phylogeographic and genetic studies have revealed complex variation in connectivity across the Southeast Australian Biogeographic Barrier (SEABB) for intertidal rocky-shore invertebrates. The objective of this study was to use Connie2 to test whether differences between El Niño and La Niña years alter the probability of larvae crossing the SEABB. The SEABB occurs on the SE corner of Australia and is the convergence site of two major ocean currents (Zeehan and East Australian Currents) as well as an historical land bridge connecting Tasmania to the mainland. It includes extensive sandy shore lacking suitable substrate for rocky-shore specialists. Study locations included coastal sites from New South Wales, Victoria, and Tasmania categorised into four regions (Barrier, Eastern, Western, and Southern). Connie2, an interactive hydrodynamic modelling tool available online, was used to evaluate connectivity via larval dispersal by comparing the effect of planktonic larval duration (PLD) from five to 120 days, season of spawning, and ENSO variability (comparing La Niña and El Niño years) on the cumulative probability of dispersal between and among populations (regions) arrayed either side of the SEABB. For all years, strong connections were detected among sites within regions, even for low to moderate (less than 20% predicted dispersal) PLDs and irrespective of season. Connectivity across SEABB (between regions) was also strongly influenced by all variables but occurred only at PLD of at least 30 days for summer spawning. Connectivity across the SEABB was strongest from west to east and south to east during La Niña events. Our findings support the importance of SEABB as a barrier to dispersal. Migration across SEABB is predicted only for summer spawners (PLD ≥30 days). Predicted dispersal is only weakly influenced by El Niño and La Niña extremes, but connectivity may be altered by projected changes to the relative strengths of the Zeehan and East Australian Currents.
Consistent implementation of hand-washing within the hospital environment remains a challenge in infection prevention (IP) procedures. IP is one of a number of measures to tackle antimicrobial resistance (AMR). A cross-disciplinary team was assembled to experiment with different ways of visualising the microbial. The paper details a comparative experimental design where nurses (n = 2) performed a series of routine care procedures in a mock-ward setting where traces of coloured ultra-violet glow-powders had been purposely placed, first with routine hand-washing and second without routine hand-washing. The results presented as a series of photos, video-clips, ethnographic observations and nurse interviews explore nurse–microbial relations and the potential for affective and embodied encounters with microbial worlds to generate new insight in IP. We argue for creating unfamiliar aesthetics that engage the sensate as an intervention in established IP education. The aesthetic rendered invisible microbes visible through techno-artistic practice. The performance term “devising” was used to analyse the cross-disciplinary methodological process. Finally, we consider the potential for nurses to act as microbial citizens as they extend their care for the human to entail the need to care for the microbial, perhaps not to kill but to relocate the risky pathogen, as part of a commitment to multispecies living in a world with AMR.
Global freshwater systems are threatened by multiple anthropogenic stressors via impacts on ecological structure and function necessary to maintain their health. In order to properly manage freshwater ecosystems, we must have a better understanding of the ecological response to human-induced stressors, especially in multiple stressor environments. When long-term observational records are scarce or non-existent, paleolimnology provides a means to understanding ecological response to long-term stress. Lake Gusinoye is a large, deep lake in continental southeast Siberia, and has been subject to multiple human-induced stressors since the 19th century. Diatom assemblages since the late 17th century were reconstructed from a Lake Gusinoye sediment core to increase our understanding of the response of primary producer communities to centuries of environmental change. Records of anthropogenic contamination of Lake Gusinoye (as indicated by spheroidal carbonaceous particle, trace metal, and element records) indicate increases in regional and local development c. 1920. Diatom assemblages were initially dominated by Aulacoseira granulata, which declined beginning in the 18th century, likely as a response to hydrological change in the Gusinoye basin due to regional climate warming following the termination of the Little Ice Age (LIA). Significant diatom compositional turnover was observed since the 19th century at Lake Gusinoye. Since the early 20th century, Lake Gusinoye diatom assemblages have changed more profoundly as a result of multiple anthropogenic stressors, including nutrient influx, aquaculture, and wastewater discharge from the Gusinoozersk State Regional Power Plant. Recent diatom assemblages are dominated by Lindavia ocellata and nutrient-rich species, including Fragilaria crotonensis and Asterionella formosa. Evidence of continued nutrient enrichment at Lake Gusinoye is likely due to aquaculture in the lake, and suggests potential interactive effects of warming regional temperatures and increasing nutrients (eutrophication).
Many smallholder farmers in Jaman North District, Brong-Ahafo Region, Ghana are shifting from food crop production to increased cultivation of cashew, an export cash crop. This paper examines gendered and generational tensions in increased commercialisation of land, livelihood diversification, and household food security in the context of globalisation and environmental change. Using qualitative, participatory research with 60 middle-generation men and women, young people and key stakeholders, the research found that community members valued the additional income stream. Young people and women, however, were apprehensive about the long-term consequences for food security of allocating so much land to cashew plantations. Young, middle, and older generations were concerned about their weak bargaining position in negotiating fair prices with export companies and intermediaries. Greater integration into the global economy exposed rural actors to multiple risks and inequalities, such as the uneven effects of economic globalisation, rises in food prices, hunger and food insecurity, growing competition for land, youth outmigration and climate change. The shift towards cashew cultivation appears to be exacerbating gender and generational inequalities in access to land and food insecurity and leading to exploitation within the global agri-food supply chain among already vulnerable rural communities in the global South. With stronger farmer associations and cooperatives, however, cashew farmers stand the chance of benefitting from greater integration into the global economy, through strengthened bargaining positions. Greater understanding is needed about the complex interactions between sustainable food systems, changing land use and gender and generational inequalities in rural spaces.
The atmosphere harbours a vast diversity of primary biological aerosols (PBAs) that are subjected to vertical and horizontal dispersal mechanisms that are not fully understood. In addition to size and weight constraints on PBAs to be lifted into the air column, local meteorological features dominate the fate of bioaerosols and their possible inclusion in long-range transport. For organic particles to be included into long distant dispersal, they have to overcome surface vertical mixing of the planetary boundary layer (PBL) to reach levels of laminar air movement. Hence, the biogeography of PBAs along a vertical distribution through the PBL needed further study. To assess the microbial biodiversity along an altitudinal gradient, air samples were collected between 1,000 and 3,100 m above sea level at Mount Sonnblick in the Austrian Alps. 16S rRNA gene and internal transcribed spacer sequencing for bacteria and fungi, respectively, were used to define distinct microbial communities that were separated by the PBL. Up to the top of the PBL, plant-associated bacteria and fungi were detected and were subjected to limited vertical dispersal due to size-constraints. This indicates that those communities become aerosolised but were not lifted into higher altitudes. However, a variety of ubiquitous, thermophilic strains that are often identified with heavy dust events and high endurance towards extreme conditions were significantly increased (relative abundance) at higher elevations. The lack of information on vertical dispersal is due to reliance on ground-based investigations that bias the interpretation of dispersal dynamics. Thus, to understand the mechanisms for near-ground communities to become airborne and subsequently included in long-range transport, we recommend investigating meteorological driving forces for an improved biogeographical assessment. Here, we show, for the first time, an assessment of the biogeography of bacterial and fungal assemblages along a vertical alpine air column transect.
Following the mandate in the Paris Agreement for signatories to provide “climate services” to their constituents, “downscaled” climate visualizations are proliferating. But the process of downscaling climate visualizations does not neutralize the political problems with their synoptic global sources—namely, their failure to empower communities to take action and their replication of neoliberal paradigms of globalization. In this study we examine these problems as they apply to interactive climate-visualization platforms, which allow their users to localize global climate information to support local political action. By scrutinizing the political implications of the “zoom” tool from the perspective of media studies and rhetoric, we add to perspectives of cultural cartography on the issue of scaling from our fields. Namely, we break down the cinematic trope of “zooming” to reveal how it imports the political problems of synopticism to the level of individual communities. As a potential antidote to the politics of zoom, we recommend a downscaling strategy of connectivity, which associates rather than reduces situated views of climate to global ones.
This paper discusses the rise in volcano tourism in the last few decades, focusing on its impact in recent eruptive crises in Iceland. The paper uses evidence from ethnographic research and surveys to argue that two divergent economic narratives come into conflict around volcanoes: the problematisation of the earth as potentially risky, and the elevation of those risky behaviours as something worth commodifying. Icelandic civil protection (Almannavarnir) have increasingly become concerned about the behaviour of tourists around active volcanoes, particularly during eruptions. However, this is also a considerable opportunity for tour groups. During the 2014–2015 eruptions at Holuhraun, there was concern about high levels of gas that were being emitted, and so tourists were banned from the site. This led to clandestine efforts to get in by helicopter after dark. The felt need for these experiences can be traced back at least to the Enlightenment period, and denotes an example of affective commodification, as the sublime encounter between humans and raw energy of the earth is rendered valuable in monetary terms – and yet transcends commodification in a simple sense.
This paper makes a case for spiritualising climate change, outlining the importance of bringing diverse religious understandings into climate change responses, particularly in the Pacific Island region. It situates this as part of a wider geographical project of rendering climate change locally meaningful, and story-telling multiple climate change narratives, including Christian ones. It identifies one of the major obstacles to this spiritualisation: the treatment of religious thought as a barrier to climate change action by much of the existing social science research in the Pacific Islands. Rather than attempting to purify scientific and religious knowledge, this paper proposes an alternative approach, tufala save: the balancing of multiple epistemologies of climate change, exploring their convergences and tensions. This paper draws on four months of ethnographic fieldwork in Vanuatu, and over 60 semi-structured interviews with religious figures and individuals engaged in climate change adaptation and advocacy across the Pacific Island region. It applies the tufala save approach in order to explore one recurring narrative, the biblical story of Noah and the flood, due to the contentious associations between this story and climate change denial in Oceania. The paper traces three discursive manifestations of the Noah story within the Pacific Islands: rainbow covenant as a basis for denial, Noah as an icon of preparation, and Islanders as unjustly outside of the ark. The contrasts between these three articulations – in terms of the relations between the different knowledges and the possibilities for climate change action they encourage and foreclose – demonstrate the heterogeneity of religious responses to climate change and the potential for fruitful connections between religious and scientific knowledges. They highlight the potential for more-than-scientific yet not anti-scientific responses to climate change that are locally meaningful and morally compelling.
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